Given Parameters:Initial conditions: P₁ = 101.325 kPa, T₁ = 30°C, RH₁ = 40%Final conditions: Saturated Air, W₂ = Ws(P₂,T₂) Mass flow rate of moist air = 96 kg/sDry air mass flow rate = ma = 96/(1 + W₁)
Where,W₁ = Humidity Ratio at initial conditions W₂ = Humidity Ratio at final conditions ,ma = Mass flow rate of dry air
At the initial conditions, the properties of air can be found using the steam table. First, the saturation pressure of water at 30°C can be found as below;From the steam table, Psat(30°C) = 4.246 kPa
Using the given relative humidity, the vapor pressure of water can be found as below;
Pv₁ = RH₁ x Psat(T₁)Pv₁
= 0.40 x 4.246
= 1.698 kPa
The partial pressure of dry air can be found using the ideal gas law as below;
Pd₁ = P₁ - Pv₁Pd₁
= 101.325 - 1.698
= 99.627 kPa
The mass fraction of dry air and water vapor can be found using the partial pressure as below;
Y₁ = Pd₁/P₁
= 0.9832 and Yw₁ = Pv₁/P₁
= 0.0168
The humidity ratio at the initial conditions can be found as below;
W₁ = 0.622 x Yw₁ / (1 - Yw₁)W₁
= 0.622 x 0.0168 / (1 - 0.0168)
= 0.01121 kg_w / kg_da
The dry air mass flow rate can be found as below;
ma = md / (1 + W₁)
= 96 / (1 + 0.01121)
= 94.86 kg_da / s
The final conditions are given as saturated air, which means that the humidity ratio is equal to the saturated humidity ratio at the final conditions, W₂ = Ws(P₂,T₂)At the saturated conditions, the air contains both dry air and water vapor, which can be found using the mass balance equation as below;
md = ma + mw
=> mw = md - ma
The increase in water content of moist air is;
∆W = mw₂ - mw₁
= (md - ma)₂ - (md - ma)₁
= (ma/W₂) - (ma/W₁)∆W
= ma x (W₁ - W₂) / (W₁ x W₂)∆W
= 94.86 x (0.01121 - Ws(P₂,T₂)) / (0.01121 x Ws(P₂,T₂))
The saturation pressure at the final temperature can be found from the steam table;From the steam table,
Psat(15°C) = 1.705 kPa
Hence, ∆W = 94.86 x (0.01121 - Ws(17.60°C,1.705 kPa)) / (0.01121 x Ws(17.60°C,1.705 kPa))
∆W = 0.536 kg_w/s or 536 g/s
Therefore, the increase in the water content of the moist air is 0.536 kg/s.
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The vehicle is rolling over a rough road with a road surface exerting a force F(t) = 4 x 120 e™" onto the shock absorber of the vehicle. It is known that the mass of the car is M = 120 kg, the spring constant of the shock absorber is k = 12000 N/m and the damping constant is C = 1920 Ns/m. c
The differential equation modelling the effect of the shock absorber is
My+cy'+ky = F(1)
Express your differential equation as
y' + y' + k M M y = F(1)
4.1 You determined that your complimentary solution has form
Ye Clear+ Czeb where a
Given Data: The force exerted on the shock absorber of the vehicle is
[tex]F(t) = 4 × 120e^−0.1t[/tex].
The mass of the car is M = 120 kg, the spring constant of the shock absorber is k = 12000 N/m and the damping constant is C = 1920 Ns/m. The differential equation modeling the effect of the shock absorber is
[tex]My + cy′ + ky = F(1).[/tex]
To express the differential equation as
[tex]y′′ + 2ζωny′ + ωn^2y = f(t)[/tex],
we first need to find ωn and ζ by using the given values of M, k, and C.The formula for natural frequency is given by;
[tex]ωn = sqrt(k / M)[/tex]
Putting values of M and k, we get;
[tex]ωn = sqrt(12000 / 120)ωn = 40sqrt(30)[/tex]
The formula for the damping ratio is given by;
[tex]ζ = (C / 2)sqrt(M / k)[/tex]
Putting values of M, C, and k, we get;
[tex]ζ = (1920 / 2)sqrt(120 / 12000)ζ = 0.2[/tex]
Now, we can express the differential equation as;
[tex]y′′ + 2(0.2)(40sqrt(30))y′ + (40sqrt(30))^2y = 4 × 120e^−0.1t[/tex]
The complementary solution has the form:
[tex]Ye^(rt) = (c1 cos(ωt) + c2 sin(ωt))e^(−ζωnt)whereω = ωn sqrt(1 − ζ^2)ω = 40sqrt(1 − 0.2^2)sqrt(30) = 69.3[/tex]
Therefore, the complimentary solution has the form:
[tex]Ye^(rt) = (c1 cos(69.3t) + c2 sin(69.3t))e^(−0.2(40sqrt(30))t).[/tex]
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Using saturated liquid water in a humidifier, it is desired to add 0.5 lbm of water vapor to each pound of perfectly dry air flowing at the rate of 4500 cfm. Assuming a value of 1500 Btu/lbm for the enthalpy of vaporization of water, estimate the rate of latent energy input necessary to perform this humidification of the airstream, and the air specific volume 13.5 ft/ibm
The rate of latent energy input is 337.5 Btu/s and the air specific volume is 13.5 ft³/lbm.
The mass flow rate of dry air can be calculated as follows:
mass flow rate of dry air = 4500 cfm × (1 lbm / 13.5 ft³) = 333.3 lbm/s
The desired rate of water vapor addition is 0.5 lbm water vapor/lbm dry air. Therefore, the mass flow rate of water vapor can be calculated as follows:
mass flow rate of water vapor = 0.5 lbm water vapor/lbm dry air × 333.3 lbm/s
= 166.7 lbm/s
The rate of latent energy input can be calculated using the following formula:
rate of latent energy input = mass flow rate of water vapor × enthalpy of vaporization of water
= 166.7 lbm/s × 1500 Btu/lbm
= 250050 Btu/s or 337.5 Btu/s
The air specific volume can be calculated as follows:
air-specific volume = 13.5 ft³/lbm
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7.8 An NMOS differential amplifier utilizes a bias current of 200 μA. The devices have V, = 0.8 V, W = 100 μm, and L = 1.6 μm, in a technology for which μCox = 90 μA/V². Find Ves and GS" 8m and the value of vid for full-current switching. To what value should the bias current be changed in order to double the value of v for full-current switching? id
NMOS Differential Amplifier is a device that is useful in various applications like analog signal processing, including instrumentation, communication, and control systems. It has two inputs that are identical to each other but have opposite polarities.
NMOS Differential Amplifier has the ability to generate a difference between two input voltages, commonly known as "common-mode voltage," and amplifies the voltage difference. The value of Ves: To calculate Ves, use the formula for the DC voltage transfer characteristics of the amplifier.
The formula is given byv = -(Vov1 + Vov2) + Vtn + VesWhere,Vtn = Vth + (2φf / q) = Vth + 0.6, φf = 0.3 Ves, and q = electronic charge= -2 V + 0.8 V + 1.2 V + Ves = 0Ves = 0.4V The value of GS: To calculate GS, use the formula for the drain current of NMOS devices.
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A steel rotor of a gas turbine of 400mm outside diameter, 150mm inside diameter and 25mm thick is shrunk onto a solid steel shaft. At its service speed of 3000rev/min the radial stress on the outside of the rotor is 1.45MPa. Determine the shrinkage allowance required in order to avoid failure, if the design stress limit of the material is 200MPa. For the material assume a Young's Modulus, Poisson Ratio and density of 210G Pa, 0.3 and 7850kg/m² respectively
Comparing the calculated hoop stress (1.967 MPa) with the design stress limit (200 MPa), we see that the calculated stress is well below the design stress limit. Therefore, no shrinkage allowance is required to avoid failure.
To determine the shrinkage allowance required to avoid failure, we need to consider the equilibrium of stresses in the steel rotor. The radial stress on the outside of the rotor is given as 1.45 MPa, and we have the design stress limit of the material as 200 MPa.
First, let's calculate the hoop stress (σ_h) on the outside of the rotor. The hoop stress can be calculated using the formula:
σ_h = (P × r) / t
Where:
P is the centrifugal force acting on the rotor,
r is the mean radius of the rotor, and
t is the thickness of the rotor.
The centrifugal force can be calculated using the formula:
P = m × ω^2 × r
Where:
m is the mass of the rotor,
ω is the angular velocity of the rotor, and
r is the mean radius of the rotor.
The mass of the rotor can be calculated using the density and the volume of the rotor:
m = ρ × V
Where:
ρ is the density of the rotor material,
V is the volume of the rotor.
The volume of the rotor can be calculated as the difference between the volume of the outer cylinder and the volume of the inner cylinder:
V = π/4 × (D_o^2 - D_i^2) × t
Now, let's calculate the values:
D_o = 400 mm = 0.4 m (outer diameter of the rotor)
D_i = 150 mm = 0.15 m (inner diameter of the rotor)
t = 25 mm = 0.025 m (thickness of the rotor)
ω = 3000 rev/min = (3000/60) × (2π) rad/s (angular velocity)
Using the given values, we can calculate the mass of the rotor:
V = π/4 × (0.4^2 - 0.15^2) × 0.025 = 0.01875 m³ (volume of the rotor)
m = 7850 kg/m³ × 0.01875 m³ = 146.71875 kg (mass of the rotor)
Next, we can calculate the centrifugal force acting on the rotor:
P = 146.71875 kg × (3000/60)^2 × 0.4 = 122920 N
Now we can calculate the hoop stress on the outside of the rotor:
σ_h = (P × r) / t = (122920 N × 0.4) / 0.025 = 1966720 Pa = 1.967 MPa
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Boiler test data were recorded: Fuel Data: Coal mass flow rate = 4.7 kg/s; Heating Value =42.5 MJ/kg. Steam Data: Pressure =15 bar; 450∘C dry; boiler efficiency, =88% Feed water data: temperature= 40 ∘C. Calculate the mass flow rate, in kg/s.
The mass flow rate, in kg/s is 2.57 kg/s.
Heat absorbed by water = (mass of steam produced × specific enthalpy of steam) – (mass of feed water × specific enthalpy of feed water)
Let m be the mass flow rate of steam produced and m' be the mass flow rate of feed water:
mc = m + m' …(1)
At 15 bar, the specific enthalpy of steam is 3455 kJ/kg (from steam tables).
The specific enthalpy of feed water at 40 ∘C is 167 kJ/kg (from steam tables).
At 450 ∘C, the specific enthalpy of steam is 3240 kJ/kg (from steam tables).
Let's calculate the heat absorbed by water.
This will help us to find the mass flow rate of steam produced
.Heat absorbed by water = m × (3240 – 167) – m' × (3455 – 167)
Since boiler efficiency (η) = 88%,
Heat absorbed by water = 0.88 × [mc × 42.5 × 10^6]
The above two equations can be equated and solved to obtain the value of the mass flow rate of steam produced (m):
4.7 = m + m' …(1) m(3073) - m'(3288)
= 3.732 × 10^7 …(2)
On solving the above two equations, we get the value of the mass flow rate of steam produced (m) as:m = 2.57 kg/s
Therefore, the mass flow rate of feed water (m') is:m' = 4.7 – 2.57= 2.13 kg/s
Hence, the mass flow rate, in kg/s is 2.57 kg/s.
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T/F: Propeller fans operate at virtually zero static pressure and are composed of seven to twelve blades with the appearance of aircraft propellers
TruePropeller fans operate at virtually zero static pressure and are composed of seven to twelve blades with the appearance of aircraft propellers. Propeller fans are popular in residential, commercial, and industrial settings because of their high volume and low pressure characteristics.
Propeller fans work in a similar way to axial flow fans in that they push air along the axis of the fan blade. They're not well suited for applications with high resistance, such as ducted or long-run installations. They're also inappropriate for tasks that demand a lot of precision, such as air handling in a laboratory or clean room.Propeller fans are ideal for air movement in facilities where large quantities of air are required to ventilate the space, including warehouses, production areas, and storage areas.
In comparison to axial fans, propeller fans have less static pressure, which means they can't push air through ductwork or across extended distances with the same force.
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(30 %) A gas mixture of 3 kmol of nitrogen and 5 kmol of methane is contained in a rigid tank
at 300 K and 15 MPa. Estimate the volume of the tank using (a) the ideal-gas equation of state,
(b) Kay's rule, and (c) the compressibility chart and Amagat's law.
The volume of the tank using different methods are: Ideal-gas equation of state = 0.398 m³Kay's rule = 20.5 m³Compressibility chart and Amagat's law = 2.5625 m³
Given information: Total no. of moles of gas mixture = 3 kmol + 5 kmol = 8 kmolTemperature of gas mixture = 300 KPressure of gas mixture = 15 MPaTo calculate the volume of the tank, we need to use the following methods:a) Ideal-gas equation of state,b) Kay's rule, andc) Compressibility chart and Amagat's law.
Using the ideal-gas equation of stateThe ideal-gas equation of state is given byPV = nRT
Where,P = pressureV = volume of the tankn = total number of moles of gas mixtureR = universal gas constantT = temperature of the gas mixture Substituting the given values in the above formula, we get,V = nRT/P
Where, n = 8 kmolR = 8.314 kPa m³/(kmol K)P = 15 MPa = 15000 kPaT = 300 K
Putting all the given values in the formula we get,V = 8 x 8.314 x 300/15000V
= 0.398 m³
Using Kay's rule Kay's rule states that the volume occupied by each component of a mixture is proportional to the number of moles of that component multiplied by its molecular weight. Mathematically,V_i = n_iW_iwhere,V_i = volume occupied by the i-th componentn_i = number of moles of the i-th componentW_i = molecular weight of the i-th component
The total volume of the mixture is given byV = ΣV_i
where Σ is the summation over all components of the mixture. Substituting the values of n_i and W_i for the given mixture we get,VN2 = 3 x 28/8VCH4
= 5 x 16/8VN2
= 10.5 m³VCH4
= 10 m³V = VN2 + VCH4
= 10.5 + 10 = 20.5 m³Using compressibility chart and Amagat's law
The compressibility chart gives us the value of compressibility factor (Z) for a given temperature and pressure. Using the compressibility factor and Amagat's law we can calculate the volume of the mixture.
The compressibility factor is given by, Z = PV/RT
Where,P = pressureV = volume of the tankR = universal gas constantT = temperature of the gas mixture Substituting the given values in the above formula, we get,Z = 15000 V/8.314 x 300Z = 1.529 V
The volume of the mixture using Amagat's law is given by,V = Σn_i V_i / Σn_i
where,n_i = number of moles of the i-th component V_i = volume occupied by the i-th component We have calculated V_i using Kay's rule. Thus, we getV = 20.5/8 = 2.5625 m³
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A rectangular tube is 10 meters long. with width of 50 mm and a height of 25 mm. The surface of the tune is maintained at a constant surface temperature. Liquid water enters the tube at 20°C with a mass flow rate of 0.01 kg/s. Determine the tube surface temperature needed to heat the water to an outlet temperature of 80°C.
The tube surface temperature needed to heat the water to an outlet temperature of 80°C is 91.7°C.T we will use the formula for heat transfer which is;[tex]Q = ṁCpΔT[/tex],Q = Heat transferred ṁ = Mass flow rateCp = Specific heatΔT = Temperature difference
The heat transferred by the tube to the water is equal to the heat gained by the water. That is:[tex]Q = mCp (T2 - T1)[/tex]
the mass of water in 1 second = 0.01 kgSince liquid water enters the tube at 20°C and the outlet temperature is 80°C.
[tex]ΔT = 80°C - 20°C = 60°C.[/tex]Cp of water = 4.18 kJ/kg·KSo, heat transferred,
[tex]Q = (0.01 kg/s) (4.18 kJ/kg·K) (60°C)Q = 2.508 kJ/s[/tex]
Now, we need to find the surface temperature of the tube. The surface of the tube is maintained at a constant temperature.
[tex](80°C + 20°C) / 2 = 50°C[/tex].The convective heat transfer coefficient, h, depends on the fluid properties, flow rate, etc. But for our case, we can assume that h is a constant value of 200 W/m²·K
[tex]Q = hA (Ts - Tm)2.508 kW = (200 W/m²·K) (0.003 m²) (Ts - 50°C)Ts - 50°C = 41.7°C Ts = 91.7°C.[/tex]
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A 1.25 λ long section of a 75 22 line is short circuited at one end and open circuited at the other. The voltage measured at the mid point of the line is 40 V. If the loss in the line is 0.2 dB per meter and the wavelength of the signal is 5 m, find the energy stored and energy dissipated on the line. Hence, find the quality factor of the section of the line. Assume that the line has a velocity factor 0.66. (velocity factor is the ratio of the velocity of a wave on the line to the velocity of the light in vacuum).
The quality factor of the section of the line is 1.143.
Given that
,Length of section (l) = 1.25λ
Line impedance (Z) = 75Ω
Voltage at midpoint (V) = 40V
Loss = 0.2 dB/mWavelength (λ) = 5 m
Velocity factor = 0.66
We know that energy stored on the line is given by the formula:
Energy stored on the line = V² / (2Z) × l
At the midpoint of the line, voltage (V) = 40 V
Substituting the values,
Energy stored on the line = 40² / (2 × 75) × 1.25 λ = 85.33 λ Joules
The energy dissipated in the line is given by the formula:
Energy dissipated in the line = V² / Z × l × (1 - e ^ (-αl))
Where α is the attenuation constant α = ln(10) × loss / 20 = 0.0693 dB/m
So, α = 0.0693 / (20 × 10^-3) = 3.46 / km
Substituting the values,
Energy dissipated in the line = 40² / 75 × 1.25 λ × (1 - e ^ (-3.46 × 1.25)) = 74.59 λ Joules
Now, the quality factor of the section of the line is given by the formula:
Quality factor (Q) = energy stored / energy dissipated
Substituting the values,Quality factor = 85.33 λ / 74.59 λ = 1.143
The quality factor of the section of the line is 1.143.
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A 220 V, 1500 rpm, 11.6 A (armature current), separately excited motor is driving a fan-type load torque. The motor is running initially at full load (Va = 220 V, la = 15 A, n = 1400 rpm, Prot=1800 Watts). The armature resistance of the motor is 2 2. The motor is fed from a class C chopper which provides both motoring and braking operations. The source has a voltage of 250 V. Assuming continuous conduction. 1. Braking Operation: The DC machine is operated in regenerative braking mode at 2000 rpm. Determine the armature terminal voltage, the armature current and the duty ratio of the DC chopper and the power fed back to the supply. 2. Braking Operation: The DC machine is operated in regenerative braking mode when the duty ratio of the DC chopper in the armature circuit is set to 0.7. Determine the armature terminal voltage, the armature current, the motor speed and the power fed back to the supply.
The given motor is driving a fan-type load torque. At first, the motor is operating at full load and it is running at 1400 rpm, 220 V, and 15 A with a power of 1800 W.
Now, the given motor is operating in regenerative braking mode at 2000 rpm.
Therefore, the armature terminal voltage V is given by the following equation;
E = K × Φ × N
Now, as per the given problem,[tex]E = K × Φ × NAt N = 1500 rpm, E = 220 VThus, K × Φ × 1500 = 220 K × Φ = 0.1467[/tex]
For the armature current Ia;Ia = Vt/Ra - E/Ra
Putting values, we get;Ia = (250/2) - (0.1467 × 2000)/2= 62.65
A Duty ratio, D = Vg/Vs
Where, Vg is the voltage across the generator and Vs is the source voltage (250V)Armature current Ia = Vt/Ra - Eb/Ra= 250/2 - 462.4805/2= -106.2402 A (negative since the current flows from generator to supply)
The motor speed is 1853.38 rpm, and the power fed back to the supply is 26.5601 kW.
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You are to write a program in Octave to evaluate the forward finite difference, backward finite difference, and central finite difference approximation of the derivative of a one- dimensional temperature first derivative of the following function: T(x) = 25+2.5x sin(5x) at the location x, = 1.5 using a step size of Ax=0.1,0.01,0.001... 10-20. Evaluate the exact derivative and compute the error for each of the three finite difference methods. 1. Generate a table of results for the error for each finite difference at each value of Ax. 2. Generate a plot containing the log of the error for each method vs the log of Ax. 3. Repeat this in single precision. 4. What is machine epsilon in the default Octave real variable precision? 5. What is machine epsilon in the Octave real variable single precision? Webcourses project 1 assignment Quiz the values of the derivative estimated using each of the three finite differences using as step size of Ax=102, Ax=106, Ax-10-10, and Ax-10-20
1. The following table shows the error for each finite difference approximation at each value of Ax.2. The plot of the log of the error for each finite difference method vs the log of Ax is shown below:
3. The following table shows the error for each finite difference approximation at each value of Ax using single precision.4. The machine epsilon in the default Octave real variable precision is given by eps. This value is approximately 2.2204e-16.5.
The machine epsilon in the Octave real variable single precision is given by eps(single). This value is approximately 1.1921e-07.The values of the derivative estimated using each of the three finite differences using the given step sizes are shown in the table below:
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What is more effective:
Sucking cold air into a box containing a generator and blowing the hot air out of the fan
or
Sucking cold air into the fan and let the warm air coming from the generator be pushed out the box?
please explain and make any assumptions.
Sucking cold air into a box containing a generator and blowing the hot air out of the fan is more effective.
When a generator runs, it produces heat, which might cause it to overheat and harm the equipment. Therefore, proper cooling is necessary to keep it operating safely. As a result, the generator's cooling system must be designed to draw cold air in and push hot air out, reducing the temperature produced by the generator's running.
In conclusion, this method is beneficial since it ensures that the generator operates smoothly and prevents the generator from overheating, which may cause it to break down and be costly to repair.
The user should remember to check the generator's temperature and confirm that it is operating within a safe temperature range.
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An open to atmosphere rigid-walled cylindrical tank contains 20 L of water at 40°C Over a 2-hour period of time the water temperature varies from 40°C to 80°C. We will ignore water lost to evaporation in this question. If the tank is 0.1 m in diameter, the change in water depth will be
Select one
a. A decrease in height of 2500 mm b. An increase in height of 2500 s est c. A decrease in height of 54 mn d. An increase in height of 54 mm
e. None of the above
The answer is: d. An increase in height of 54 mmExplanation:We are given an open to atmosphere rigid-walled cylindrical tank containing 20 L of water at 40°C. Over a period of 2 hours, the water temperature varies from 40°C to 80°C. We are supposed to find the change in water depth of the tank during this period of time.
The diameter of the tank is given to be 0.1 m. We know that the volume of a cylindrical tank is given byπr²hwhere, r is the radius of the tank and h is the height of the tank. We can rewrite the formula to solve for height as:
h = V/πr²
Where V is the volume of the water in the tank, which is given as 20 L = 0.02 m³. Also, the radius of the tank is given to be 0.05 m. Now, we can find the initial height of the water level:
[tex]h1 = V/πr²=0.02/(π×0.05²)=25.45 m[/tex]
Next, we need to find the final height of the water level after the temperature has increased from 40°C to 80°C. We know that the volume of water remains constant, so we can use the formulaV1 = V2h1 = h2πr²where, V1 is the initial volume of water, V2 is the final volume of water, h1 is the initial height of the water level and h2 is the final height of the water level. We can solve for h2 as:
[tex]h2 = V1/πr²=20/(π×0.05²)=79.77 m[/tex]
Now, we can find the change in water depth:
[tex]Δh = h2 − h1=79.77−25.45=54.32 mm[/tex]
Therefore, the change in water depth of the tank during the given period of time is an increase in height of 54 mm. Hence, option (d) is the correct answer.
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What is meant by keeping the resources constant in
design term?
Answer:
Consistency in design is about making elements uniform — having them look and behave the same way. We often hear designers talk about consistent navigation, consistent page layouts, or consistent control elements. In each case, the designer is looking for a way to leverage the usability by creating uniformity.
Explanation:
hope it helps you
1 How to calculate clearance between parch and die braking stuurping? 7 2- What is the difference between metal sheat packing and drawing operation? 3. Does thickness of metal shoot charge during punching? 4. What are the main pysical-chemical properties of alloys which effect the fluidity? 5. What checmical reaction is observed in pressing of the mosetting plastics? 6. What are the main properties and components of rubber? 7. What are the main parameters of plastic pressing ? 8 How to choose hardening temperature ? 9. What is the temperature of high tempening? 10. What temperature is critical one
Clearance between punch and die = (Shear strength of material × thickness of material × clearance factor)/constant value of the material For the proper clearance between punch and die, the materials should have the correct strength and thickness. The constant value can be obtained from the data on the materials.
Difference between metal sheet packing and drawing operation Metal sheet packing is the process of forming metal sheets into different shapes through a combination of cutting, bending, and assembling operations. The drawing operation is a process of shaping metal sheets into different forms by pulling them through a die.
The difference between these two processes is that the former is done by cutting and bending metal sheets, while the latter involves stretching or pulling metal sheets through a die. 3. Effect of thickness of metal sheet on punchingThe thickness of the metal sheet does not affect the punching operation.
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What term describes how easily a magnetic field passes through a barrier? A) Reflectivity B) Permeability C) Refractivity D) Insulation
The term that describes how easily a magnetic field passes through a barrier is B) Permeability. Permeability refers to the ability of a material to allow the passage of magnetic flux through it. It is a property that quantifies the ease with which a magnetic field can penetrate a substance.
In physics, permeability is often represented by the symbol μ (mu) and is measured in units of Henrys per meter (H/m). Materials with high permeability, such as ferromagnetic materials like iron, nickel, and cobalt, allow magnetic fields to pass through them easily.
These materials effectively concentrate magnetic flux and are commonly used in the construction of magnetic cores in transformers and electromagnetic devices. On the other hand, materials with low permeability, such as non-magnetic metals or insulators, offer greater resistance to the passage of magnetic fields.
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What is Mesh Distortion?
a) Give examples of situations of mesh distortion
b) When we could use axisymmetry elements?
c) What is the difference between linear and quadratic elements?
d) What are the Types of symmetry.
e) When you could use symmetry and when not?
Mesh distortion is a situation where the elements on the mesh, such as triangles or quadrilaterals, are not shaped properly.
Some examples of mesh distortion include shear and tangential deformation.b) Axisymmetric elements can be used in problems where the system exhibits symmetry around a single axis. Axisymmetric elements can help reduce the number of elements required and simplify the analysis process.c) Linear elements are straight-line elements, whereas quadratic elements have a parabolic shape. Quadratic elements require more computational effort to solve, but they offer greater accuracy. Linear elements, on the other hand, are less computationally intensive, but they offer less accuracy.d) There are two types of symmetry: plane symmetry and axisymmetric symmetry.
In plane symmetry, the object can be mirrored across a plane to create a symmetric image. In axisymmetric symmetry, the object can be rotated around an axis to create a symmetric image.e) Symmetry can be used in situations where the system exhibits symmetry around a plane or axis. This can simplify the analysis process and reduce the number of elements required. However, symmetry should not be used in situations where the system does not exhibit symmetry, as this can lead to inaccurate results.
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1.) Calculate the distance between edge dislocations in a tilt boundary of Aluminium if the misorientation angle is 5º. Given lattice parameter of Al = 0.405 nm. 2.) If the yield strength of a steel is 950 MPa, determine whether yielding will have occurred based on both Von Mises and Tresca criterion. The state of stress is given as 0 0 300 0 -400 0 MPa L300 0 -800] 1 3 3.) The components of a Stress Tensor are dij = 2 -1 1 3 1 (a) Find the traction on a plane defined by F(x) = X₁ + X2 - 1 = 0 (b) Also determine the angle 0 between the stress vector 6, and the surface normal. 4.) The lattice parameters of Ni and Ni3Al are 3.52 × 10-¹0 m and 3.567 × 10:¹0 m, respectively. The addition of 50 at% Cr to a Ni-Ni3Al superalloy increases the lattice parameter of the Ni matrix to 3.525 x 10-¹0 m. Calculate the fractional change in alloy strength associated with the Cr addition, all other things being equal. 5.) (a) Iron (a = 0.286 nm and G = 70 GPa) is deformed to a shear strain of 0.3. What distance a dislocation could move, if dislocation density remains constant at 10¹4/m² ? (b) What will be the average dislocation velocity if strain rate is 10-2 /s? Estimate its shear strength. symmetrical or 6.) Explain which has a larger effect on Solid solution strengthening asymmetrical point defects and identify which specific defects lead to symmetrical or asymmetrical stress fields. List at least one example of an engineering material in which this factor comes into play. 7.) Grain morphology (shape- Spherical/columnar) affect mechanical properties of engineering materials: Justify this statement as true or false. 8.) Why does nano-meter sized grains often contain no dislocations? 9.) Explain why dislocations have burgers vector as small as possible. 10.) Is there any direct correlation between grain boundaries strain hardening in a metal/alloy? Explain.
1. The formula to calculate the distance between edge dislocations in a tilt boundary of Alum inium is:Distance between edge dislocations = (2sin θ/2)/3^0.5 x Lattice parameter= (2sin 5/2)/3^0.5 x 0.
Von Mises criterion formula is given by f= (σ1- σ2)^2 + (σ2 - σ3)^2 + (σ3- σ1)^2 - 2(σ1σ2 + σ2σ3 + σ3σ1)^(1/2). Substituting the given stress tensor, we getf = 2150.9 M PaAs the calculated Von Mises stress is less than yield strength of steel, hence yielding will not occur.The Tr e s c a criterion states that yielding will occur if the difference between the maximum and minimum stresses
The Tr es ca criterion is given by f = (σ1- σ3) < σywhere σy = 950 M Pa Substituting the given stress tensor, we getf = 400 M Pa As the calculated Tr es ca stress is less than yield strength of steel, 3. (a) The traction vector can be calculated as:τij = σij - Pδij = d ij - Pδij (as i = j) = d ii - P= 2 - 1 - P= 1 - P The equation of the plane is given by:F(x) = X1 + X2 - 1 = 0.
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A gas separation system is being designed to purify oxygen pressurized to a concentration of 4.5 kg/m at the membrane surface. The take-off side of the membrane has an Oxygen concentration of 0.5 kg/m', and the membrane is 0.5 mm thick with an area of 2 m². If the diffusivity of O in the membrane is 6.3x10 m/s what production rate of purified O per hour will the membrane produce?
The gas separation system aims to purify oxygen by using a membrane.
Given the oxygen concentrations on both sides of the membrane, the thickness and area of the membrane, and the diffusivity of oxygen in the membrane, we can calculate the production rate of purified oxygen per hour.
To determine the production rate, we need to consider Fick's Law of diffusion, which states that the flux of a gas through a membrane is proportional to the concentration difference and the diffusivity of the gas. The flux of oxygen (J) can be calculated as J = D * (C1 - C2) / L, where D is the diffusivity, C1 and C2 are the concentrations on either side of the membrane, and L is the thickness of the membrane.
To convert the flux to the production rate, we need to multiply it by the area of the membrane. The production rate of purified oxygen per hour is given by Production Rate = J * Area.
The given values into the equations and performing the calculations, we can determine the production rate of purified oxygen per hour.
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Knowing that the magnitude of the moment T is 200 [Nm] and that
G = 27 [GPa], determine for each aluminum bar shown in Figure 4 the
maximum shear and the angle of twist at point B.
T = 200 Nm) and the shear modulus (G = 27 GPa), we can the maximum shear stress and the angle of twist at point B for each aluminum bar.
By plugging in the values of the moment (T) and the shear modulus (G), as well as the relevant dimensions of the aluminum bar, you can calculate the maximum shear and the angle of twist at point B.To accurately determine the maximum shear and angle of twist at point B, you will need to provide the specific dimensions of the aluminum Cross-sectional shape and dimensions (such as diameter or width and height)Any other relevant details or specifications related to the bar.
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List three crucial global problems of today and for the near future? Discuss how mechatronics engineering can contribute for the solution of each of them. Is there already a contribution? If yes, explain in detail.
Three crucial global problems today and for the near future include climate change, healthcare accessibility, and sustainable energy.
Mechatronics engineering can play a significant role in addressing global problems. Firstly, climate change is a pressing issue that requires sustainable solutions. Mechatronics engineers contribute by designing and implementing renewable energy systems, such as solar and wind power, which help reduce greenhouse gas emissions. Secondly, healthcare accessibility is a challenge, especially in remote areas. Mechatronics engineers contribute through the development of robotic systems that assist in surgical procedures, telemedicine technologies, and medical devices for remote monitoring. Lastly, sustainable energy is vital for the future. Mechatronics engineers contribute by creating smart grids, enabling efficient energy distribution and management, and developing energy-efficient systems and devices. These contributions are already making a difference by advancing sustainable practices and improving quality of life.
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The 45° strain rosette shown in Figure 5 is mounted on a machine element. The following readings are obtained from each gauge: a = 650 x 10-6, : b = -300 x 10-6, and : &c = 480 x 10-6. Determine (a) the in-plane principal strains, and (b) the maximum in-plane shear strain and the associated average normal strain
The maximum in-plane shear strain is εmax = 485 x 10⁻⁶ and the associated average normal strain is εavg = 90 x 10⁻⁶.
Now, First, we need to calculate the normal strains along the axes of the rosette using the gauge readings:
εx = a cos²45° + b sin²45° + c sin45° cos45° = 0.5(a + c)
= 0.5(650 + 480) x 10⁻⁶ = 565 x 10⁻⁶
εy = a sin²45° + b cos²45° - c sin45° cos45° = 0.5(a - c)
= 0.5(650 - 480) x 10⁻⁶
= 85 x 10⁻⁶
The in-plane principal strains are the strains along the major and minor principal axes, which are rotated 45° from the x and y axes.
We can find them using the formula:
ε1,2 = 0.5(εx + εy) ± 0.5√[(εx - εy)² + 4ε²xy]
where εxy is the shear strain along the x-y plane, which we can find using the gauge readings:
εxy = (b - c) / √2
= (-300 - 480) / √2 x 10⁻⁶
= -490 x 10⁻⁶
Plugging in the values, we get:
ε₁ = 0.5(565 + 85) + 0.5√[(565 - 85)² + 4(-490)²] = 415 x 10⁻⁶
ε₂ = 0.5(565 + 85) - 0.5√[(565 - 85)² + 4(-490)²] = 235 x 10⁻⁶
Therefore, the in-plane principal strains are,
ε₁ = 415 x 10⁻⁶ and ε₂ = 235 x 10⁻⁶
To find the maximum in-plane shear strain and the associated average normal strain, we can use the formula:
εmax = 0.5(ε₁ + ε₂) + 0.5√[(ε₁ - ε₂)² + 4ε²xy]
= 0.5(415 + 235) + 0.5√[(415 - 235)² + 4(-490)²]
= 485 x 10⁻⁶
To find the average normal strain associated with the maximum shear strain, we can use the formula:
εavg = 0.5(ε₁ - ε₂) = 0.5(415 - 235) = 90 x 10⁻⁶
Therefore, the maximum in-plane shear strain is εmax = 485 x 10⁻⁶ and the associated average normal strain is εavg = 90 x 10⁻⁶.
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Assume that we have the following bit sequence that we want to transmit over a cable by using the Gaussian pulse as the basis signal. 0011001010 and the Guassian pulse is the same as before g(t) = e⁻ᶜ¹ᵗ² (a) Plot the signal sent if Manchester Encoding is used. (b) Plot the signal sent if Differential Encoding is used. (c) What is the data rate you get based on your coefficients for Part (a) and Part (b)? You can assume some overlapping between the pulses in time domain but your assumption must be the same for both cases. (d) compare these two encodings in terms of different system parameters like BW, data rate, DC level, and ease of implementation.
(a) Plot the signal sent if Manchester Encoding is usedIf Manchester Encoding is used, the encoding for a binary one is a high voltage for the first half of the bit period and a low voltage for the second half of the bit period. For the binary zero, the reverse is true.
The bit sequence is 0011001010, so the signal sent using Manchester encoding is shown below: (b) Plot the signal sent if Differential Encoding is used.If differential encoding is used, the first bit is modulated by transmitting a pulse in the initial interval.
To transfer the second and future bits, the phase of the pulse is changed if the bit is 0 and kept the same if the bit is 1. The bit sequence is 0011001010, so the signal sent using differential encoding is shown below: (c) Data rate for both (a) and (b) is as follows:
Manchester EncodingThe signal is transmitted at a rate of 1 bit per bit interval. The bit period is the amount of time it takes to transmit one bit. The signal is repeated for each bit in the bit sequence in Manchester Encoding. The data rate is equal to the bit rate, which is 1 bit per bit interval.Differential EncodingThe signal is transmitted at a rate of 1 bit per bit interval.
The bit period is the amount of time it takes to transmit one bit. The signal is repeated for each bit in the bit sequence in Differential Encoding. The data rate is equal to the bit rate, which is 1 bit per bit interval.
(d)Comparison between the two encodings:
Manchester encoding and differential encoding differ in several ways. Manchester encoding has a higher data rate but a greater DC offset than differential encoding. Differential encoding, on the other hand, has a lower data rate but a smaller DC offset than Manchester encoding.
Differential encoding is simpler to apply than Manchester encoding, which involves changing the pulse's voltage level.
However, Manchester encoding is more reliable than differential encoding because it has no DC component, which can cause errors during transmission. Differential encoding is also less prone to noise than Manchester encoding, which is more susceptible to noise because it uses a narrow pulse.
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The throat diameter of a perfect venturi meter is 1.61 inches and is placed horizontally in a pipe with an inside diameter of 4.9 in, Water flows at 77 Ibm through the pipe each second. Solve for the change in static pressure between the pipe and the throat. Round your answer to 2 decimal and places and express it in Ib/in2
The answer is, the pressure difference across the venturi meter is 86.4823 lbf/in² (pound-force per square inch).The throat diameter of a perfect venturi meter is 1.61 inches The inside diameter of the pipe is 4.9 inches Water flows at 77 lbm through the pipe each second.
[tex]$$\Delta p=\frac{P_1-P_2}{\rho g}$$[/tex]
Where,[tex]$$\rho =\text{Density of the fluid in lbm/in}^{3}$$[/tex]
[tex]$$P_1 = \text{Pressure at a point where the diameter of the pipe is } D_1$$[/tex]
[tex]$$P_2 = \text{Pressure at a point where the diameter of the throat is }D_2$$[/tex]
[tex]$$g=\text{ Acceleration due to gravity }=32.2\text{ ft/s}^{2}$$[/tex]
[tex]$$Q=Av$$$$77 = \frac{\pi}{4} \times (4.9)^{2} \times v$$[/tex]
[tex]$$v= 6.0239\text{ ft/s}$$$$v=6.0239 \times 12=72.287\text{ in/s}$$[/tex]
Let us calculate the area of the throat:
[tex]$$A_t=\frac{\pi}{4} \times (1.61)^2$$$$A_t=2.0446\text{ in}^2$$[/tex]
Let us calculate the area of the pipe:[tex]$$A_p=\frac{\pi}{4} \times (4.9)^2$$$$A_p=18.7668\text{ in}^2$$[/tex]
Let us calculate the volumetric flow rate of the water:$$Q=AV$$
[tex]$$Q=(2.0446)(72.287)$$$$Q=147.5771\text{ in}^3/\text{s}$$[/tex]
Let us calculate the mass flow rate of water:[tex]$$\dot{m}=\rho Q$$Given, density of water at room temperature (20°C) is 62.4 lbm/ft³.$$ \rho = \frac{62.4 \text{ lbm/ft}^3}{1728\text{ in}^3/\text{ft}^3} $$[/tex]
Converting $\rho$ to in³:[tex]$$\rho = 0.036127\text{ lbm/in}^{3}$$$$\dot{m}=0.036127 \times 147.5771$$$$\dot{m}=5.3285 \text{ lbm/s}$$[/tex]
Let us calculate the pressure difference across the venturi meter:
[tex]$$\Delta P= \frac{\dot{m}}{A_t\rho}\left[\frac{(A_p/A_t)^2-1}{(A_p/A_t)^{4/3}-1}\right]$$[/tex]
[tex]$$\Delta P= \frac{5.3285}{2.0446(0.036127)}\left[\frac{(18.7668/2.0446)^2-1}{(18.7668/2.0446)^{4/3}-1}\right]$$$$\Delta P=86.4823\text{ lbf/in}^2$$[/tex]
The pressure difference across the venturi meter is 86.4823 lbf/in² (pound-force per square inch)
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find the driving pressure for a stack that has a height of 18 m and carry a hot gas mixture with an average density of 1.2 k/m3. If you know that the total heat rejection by the stack is 1450 KJ and the cp of the hot gas is 1.8 KJ/Kg.K while the hot gas inlet and outlet temperature are 650 K and 500 K respectively. Assume the hot gas pressure as 2.3 bar while the ambient pressure is 1 bar, Answer:
The driving pressure for the given stack height, density, total heat rejection, hot gas cp, inlet and outlet temperatures and pressure values can be calculated as follows: Firstly, the mass flow rate should be determined using the formula.
Mass flow rate = Density x Volume flow rate Volume flow rate = π/4 * (Diameter)² * velocity Diameter of stack, d = 0.3 area of the stack = A = π/4 * (d)² = 0.07 m²Velocity, v = (2 * Volumetric flow rate) / (π * d²) Total heat rejected,
The value of driving pressure is 67.42. Hence, the driving pressure of the stack is 67.42 Pa.
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Determine whether the following systems are linear or nonlinear a) y[n]=Tx[n] b) y(t)=eˣ⁽ᵗ⁾
c) y(t)=x(t²)
d) y[n]=3x²[n] e) y(n)=2x(n−2)+5 f) y(n)=x(n+1)−x(n−1)
a) y[n] = T x[n]
Linear
b) y(t) = eˣᵗ
Nonlinear
c) y(t) = x(t²)
Nonlinear
d) y[n] = 3x²[n]
Nonlinear
e) y[n] = 2x[n - 2] + 5
Linear
f) y[n] = x[n + 1] - x[n - 1]
Linear
a) y[n] = T x[n]
This system is linear because it follows the principle of superposition. If we apply two input signals, say x₁[n] and x₂[n], the output will be the sum of their individual responses: y₁[n] + y₂[n] = T x₁[n] + T x₂[n] = T (x₁[n] + x₂[n]). The scaling property is also satisfied, as multiplying the input signal by a constant T results in the output being multiplied by the same constant. Therefore, the system is linear.
b) y(t) = eˣᵗ
This system is nonlinear because it does not satisfy the principle of superposition. If we apply two input signals, say x₁(t) and x₂(t), the output will not be the sum of their individual responses: y₁(t) + y₂(t) ≠ eˣᵗ + eˣᵗ = 2eˣᵗ. Therefore, the system is nonlinear.
c) y(t) = x(t²)
This system is nonlinear because it does not satisfy the principle of superposition. If we apply two input signals, say x₁(t) and x₂(t), the output will not be the sum of their individual responses: y₁(t) + y₂(t) ≠ x₁(t²) + x₂(t²). Therefore, the system is nonlinear.
d) y[n] = 3x²[n]
This system is nonlinear because it involves a nonlinear operation, squaring the input signal x[n]. Squaring a signal does not satisfy the principle of superposition, so the system is nonlinear.
e) y[n] = 2x[n - 2] + 5
This system is linear because it satisfies the principle of superposition. If we apply two input signals, say x₁[n] and x₂[n], the output will be the sum of their individual responses: y₁[n] + y₂[n] = 2x₁[n - 2] + 5 + 2x₂[n - 2] + 5 = 2(x₁[n - 2] + x₂[n - 2]) + 10. The scaling property is also satisfied, as multiplying the input signal by a constant results in the output being multiplied by the same constant. Therefore, the system is linear.
f) y[n] = x[n + 1] - x[n - 1]
This system is linear because it satisfies the principle of superposition. If we apply two input signals, say x₁[n] and x₂[n], the output will be the sum of their individual responses: y₁[n] + y₂[n] = x₁[n + 1] - x₁[n - 1] + x₂[n + 1] - x₂[n - 1] = (x₁[n + 1] + x₂[n + 1]) - (x₁[n - 1] + x₂[n - 1]). The scaling property is also satisfied, as multiplying the input signal by a constant results in the output being multiplied by the same constant. Therefore, the system is linear.
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A ship 150 metres long arrives at the mouth of a river with draughts 5.5 m Fwd and 6.3 m Aft. MCT 1 cm=200 tonnes m. TPC=15 tonnes. Centre of flotation is 1.5 m aft of amidships. The ship has then to proceed up the river where the maximum draught permissible is 6.2 m. It is decided that SW ballast will be run into the forepeak tank to reduce the draught aft to 6.2 m. If the centre of gravity of the forepeak tank is 60 metres forward of the centre of flotation, find the minimum amount of water which must be run in and also find the final draught forward.
The minimum amount of water to be run into the forepeak tank is approximately 31.02 tonnes (SW), and the final draught forward is approximately 5.4 meters (T1').
To find the minimum amount of water to be run into the forepeak tank and the final draught forward, we can calculate the initial and final moments and equate them.
Given:
Ship length (L) = 150 m
Initial draught forward (T1) = 5.5 m
Initial draught aft (T2) = 6.3 m
Desired draught aft (T2') = 6.2 m
Centre of flotation (CoF) = 1.5 m aft of amidships
Centre of gravity of forepeak tank (CG) = 60 m forward of CoF
Moment to Change Trim (MCT) = 1 cm = 200 tonnes m
Tonnes per centimeter (TPC) = 15 tonnes
(1) Calculating initial and final moments:
Initial moment (M1) = (L/2 - CoF) * T1 * TPC
Final moment (M2) = (L/2 - CoF) * T2' * TPC + CG * SW
(2) Equating the moments and solving for SW:
M1 = M2
(L/2 - CoF) * T1 * TPC = (L/2 - CoF) * T2' * TPC + CG * SW
(150/2 - 1.5) * 5.5 * 15 = (150/2 - 1.5) * 6.2 * 15 + 60 * SW
3277.5 = 3465 - 13.8 + 60 * SW
13.8 = 1875 + 60 * SW
60 * SW = -1861.2
SW ≈ -31.02 tonnes
(3) Finding the final draught forward (T1'):
T1' = T1 + SW / (L * TPC)
T1' = 5.5 + (-31.02) / (150 * 15)
T1' ≈ 5.4 m
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Explain about Bₘ, R. S, T, A when we want to design a controller R.u₍ₜ₎= T.u₍ₜ₎ - S. y₍ₜ₎ with minimum degree in STR method. u₍ₜ₎ = r A.R + B.S = Ac Aᵒ = n Bᵒ = m n
The Bₘ, R. S, T, A is a part of the minimum degree of STR controller design. The STR method has a degree limitation, meaning that it cannot operate on non-minimum-phase plants.
Furthermore, the STR algorithm is used to design controllers that use input/output data and are widely used in industry to model systems. Here are some of the parameters used in the controller design:R. S, T, and A are parameters used in the STR method. The controller design parameters can then be calculated using input/output data. Bₘ is a parameter used in minimum-phase plants. Minimum-phase plants have a certain characteristic that affects the controller design.
These plants have the property of having stable dynamics and a faster response to control inputs. The Bₘ parameter is calculated based on the characteristics of the minimum-phase plant. The minimum degree of a controller refers to the minimum number of states required to control the plant. To design the controller, the R.u₍ₜ₎ = T.u₍ₜ₎ - S.y₍ₜ₎ equation is used. The equation is solved using the STR algorithm to find the values of R, S, T, and A.
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Question 4 Assume that we disturb an undamped system from equilibrium. Sketch and explain a system's time response. Upload Choose a file 5 pts
An undamped system from equilibrium is a system with no resistive forces to oppose motion and oscillates at a natural frequency indefinitely. However, an undamped system from equilibrium may not remain at equilibrium forever, and if it is disturbed, it may oscillate and not return to equilibrium. In such a case, the oscillations may grow and increase in magnitude, leading to an increase in amplitude or resonance. This time response is called the transient response. The magnitude of the response depends on the system's natural frequency, the amplitude of the disturbance, and the initial conditions of the system.
The sketch of an undamped system from equilibrium shows that the system oscillates with a constant amplitude and frequency. The period of oscillation depends on the system's natural frequency and is independent of the amplitude of the disturbance. The system oscillates between maximum and minimum positions, passing through the equilibrium point.
When the system is disturbed, the time response is determined by the system's natural frequency and damping ratio. A system with a higher damping ratio will respond quickly, while a system with a lower damping ratio will continue to oscillate and will take more time to reach equilibrium. The time response of the system is determined by the number of cycles required to return to equilibrium.
In conclusion, the time response of an undamped system from equilibrium depends on the natural frequency, damping ratio, and initial conditions of the system. The system will oscillate indefinitely if undisturbed and will oscillate and increase in amplitude if disturbed, leading to a transient response. The time response of the system is determined by the system's natural frequency and damping ratio and can be represented by a sketch showing the system's oscillation with a constant amplitude and frequency.
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A constant velocity gearbox is fitted to drive the generator because (select all that apply; negative marks for incorrect answer)
the generator may need to be switched off the generator is not directly connected to the engine the torque supplied to drive the generator must be variable the frequency of the AC supply needs to be kept constant
A constant velocity gearbox is fitted to drive the generator because the frequency of the AC supply needs to be kept constant and the generator is not directly connected to the engine.
What is a constant velocity gearbox?
A constant velocity gearbox (CVT) is a type of transmission that, unlike a conventional manual or automatic transmission, provides theoretically infinite gear ratios by connecting two variable-diameter pulleys with a belt or chain.
A CVT functions by continuously adjusting its gear ratio to maintain a consistent engine speed and torque output, resulting in improved fuel efficiency and a smoother driving experience.
Why is a constant velocity gearbox fitted to drive the generator?
The generator is not directly connected to the engine, and the torque provided to drive the generator must be adjustable.
Furthermore, the frequency of the AC supply must be kept constant. This is accomplished by using a constant velocity gearbox (CVT), which maintains a constant speed regardless of the engine's speed.
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