Consider a light, single-engine, propeller-driven, private airplane, approximately modeled after the Cessna T-41A. The characteristics of the airplane are as follows: wingspan = 35.8 ft, wing area = 174 ft², normal gross weight = 2950 lb, fuel capacity = 65 gal of aviation gasoline, the parasite drag coefficient C_D,0 = 0.025, Oswald efficiency factor = 0.8 and propeller efficiency = 0.8. The power plant comprises one-piston engine of 230 hp at sea level. Calculate the maximum velocity of the airplane at sea level. (Round the final answer to one decimal place.)

5a--Pump cavitation can cause impeller problems. With spectra describe how you would detect it using
vibration analysis. Be sure to include both low and high frequency indications.

5b-Why oil analysis may be required when vibration analysis can help finding the fault? cite and
exqmple.

Mat Lab Question

Mat Lab Question:

%% Q1 (60%)
% Follow the steps below to complete this question.
%
% Step 1: (40%)
% Create a function to perform calculations: +, -, *, or /
% 1.1 The function name should be calc and saved in its file.
% 1.2 The function has three parameters a, b, and op. The op is an
% operator.  
% 1.3 The function returns variable r for the calculation result.
% 1.4 The function should provide the following help text:
% "The calc is a simple calculator. It has three parameters.
% The first two parameters are numerical operands, and the third one
% is an operator +, -, *, or / "
% 1.5 Use the if conditional statement in the funciton to check the operator op
% and compute accordingly.
% Note: Example about the syntax to check a single character: if(op == '+')
% Note: You can test the calc function in the Command Window using the syntax:
% >> calc(5, 3, '+')
% You can display the help text:
% >> help calc
%
% You can check if a division is divided by 0, but this is not required. Hint: use Inf or NaN
%

%% Q2 (15%)
% This question is similar to the requirement in Step 1 of Q1, except the
% following:
% Function name: calc_switch.m
% Here you want to use the switch statement instead of the if statement to check the operator.
% You are not required to do Steps 2-4 in Q1. But you can test this function in the same way.

Dry, compressed air at Tm,i = 85°C, p = 20 atm, with a mass flow rate of m?? = 0.005kg/s, enters a 30-mm- diameter, 5-m-long tube whose surface is at Ts = 25°C.

Determine the thermal entry length, the mean temperature of the air at the tube outlet, the rate of heat transfer from the air to the tube wall, and the power required to flow the air through the tube. ?

PD control

1. The equation of motion for the DC motor are given by the equation:

J ¨?m + (B + KbKT Ra ) ? ?m = KT Ra Va (2)

where: J = 0.01kg · m2 , B = 0.001N · m · s, KT = 0.02N · m/A, Kb = 0.02V /s and Ra = 10?.

(a) Suppose that feedback is added to the system to achieve position control of the motor shaft. Given a desired shaft position ?r (the reference), the applied voltage is given by a proportional controller:

Va = K(?r ? ?m) (3)

Where K is the feedback gain. Find the transfer function from ?r to ?m

(b) Can you find some value of K that provides a rise time of less than 4 seconds and keeps the system overshoot less than 20%? Why?

(c) If cannot (for question 2b), can you design a new controller that achieve all the requirements in question 2b? Write down your controller and show any work involved.

Discuss the meaning/importance in 2-3 sentences per term:

(1) Beach or clamshell marks; (2) Chevron pattern; (3) Creep; (4) Endurance limit; (5) Factor of safety; (6) Fatigue life; (7) Fatigue strength; (8) Fracture mechanics; (9) Fracture toughness; (10) Griffith law; (11) Notch sensitivity; (12) S-N curve; (13) Shot peening; (14) Toughness; (15) Weibull distribution; (16) Weibull modulus.

Note: Make sure please to type the answers briefly and clearly.

1-What are the three configuration types of stereoisomers? Sketch portions of a linear polymer molecule that clearly shows each of those three types.

2-What are the two types of geometric isomers? Sketch structures for each of those types using a polymer

Explain the difference between heat treatable aluminum alloys and work hardenable aluminum alloys. Which is more easily cold worked? Why?

One kilogram of Refrigerant 134a vapor initially at 2 bar and 20°C fills a rigid vessel. The vapor is cooled until the temperature becomes -24°C. There is no work during the process.

Let T_o = 20°C, p_o = 0.1 MPa and ignore the effects of motion and gravity.

2. For the refrigerant, determine the change in exergy, in kJ.

Note: for part 1: q=-98.086kj please find part two- the change in exergy in kj

Calculate the number of cycles to failure (Nf) of an aluminum alloy exposed to reverse tensile-compressive loading (N) with a stress amplitude of 150MPa.   A = 2x10^-12.   n = 2.5m.

If initially the length (ao) of the largest crack is 0.75mm and the fracture toughness (Kc) = 35MPA m1/2.   

What are the unique PLM needs for a small and medium company? 1000-1500 words

3 Kg mass of water is heated to a temperature of 99.5 C at 1 bar of pressure. It is slowly poured into a heavily insulated beaker containing 7.5 Kg of water at a temperature and pressure of 4 C, 1 bar, respectively. The specific heat of the water, an incompressible material is, c = 4.1 KJ/(Kg K). The beaker can be considered to be an adiabatic system. The two water mass’ reach an equilibrium temperature. There is no kinetic or potential change in this problem. The dead state pressure is defined as P_o = 1 bar. Instead of mixing the two fluids together consider the following proposal. Heat is allowed to flow from the 3 Kg mass of water through a Carnot heat engine and is rejected to the surroundings. Determine the maximum amount of work that could be performed, and the exergy destroyed during the operation.

In this case the temperature and internal energy of the mass of water is changing unlike the infinite heat reservoir case.Since the temperature of the high temperature heat input is changing the Carnot efficiency is also changing.In order to account for this change, you should consider using an energy balance for every 5 C change in the temperature of the 3Kg water mass and calculate the Carnot efficiency at the average temperature.For example, in the first numerical step the temperature of the water mass would change from 99.5 to 94.5 C and the Carnot efficiency for this temperature step would be T = 370 K.You should determine the incremental work done during this step with an energy balance on the heat engine. The exergy destruction is calculated in a similar incremental manner.

(a) Calculate the work output and entropy production when the 3 Kg mass of water is brought into equilibrium with surroundings at 4 C.

(b)Compare the exergy destroyed between the mixing process and the heat engine process.

1) Explain how different engine operating conditions affect combustion ( ignition delay, temperatures, air fuel ratio, speed, heat transfer)?

2) What are the 3 sources of NOX formation, which is the least relevant, which is the most relevant, explain why?

What are austenitic steels? Write about their a) alloy principles b) effects of alloys (mechanical and radiation properties)

Provide references, please.

Many sports cars are convertibles. The air flow over such a car is significantly different depending on whether the convertible top is up or down. The engine of the 1000-kg car delivers 135 kW to the wheels, the car frontal area is 1.9 m² and rolling resistance is 2.5% of the car weight. The drag coefficient when the top is down is 0.43 and 0.31 when it is up. For 20 ºC air at one atmosphere, determine:

a. the maximum speed with the top up (in m/s)

b. the maximum speed with the top down (in m/s)