Part 1

Systems engineering is said to be a disciplined process. Why do system failures still occur? Choose an example of a technology or system failure (Examples: early airbags, Titanic, Challenger or Columbia disasters). Then respond to the following in discussion:

Explain reasons for the failure. Use figures and/or other visual aids to explain your answer.

Identify and explain any system acquisition processes that were not followed that may have contributed to the failure.

You may also use your own relevant experience.

Assume you are making a compisite material airplane, which has ligter weight and more fuel effciency. Describe how your airplane will put pressure on a culture outside of America (Choose a specific country). How your airplane will affect their society, culture, economic, and envornment, etc?  

Consider an RC circuit with resistance R and capacitance C. The circuit is stimulated with a pulse of amplitude A and width T.

The purpose of this study is to understand what happens to the impulse response, capacitor voltage, and resistor voltage for various resistor values: 600 ?, 1000 ?, and 1200 ?. The name of the MATLAB script will be called project2a. Excite the circuit with a rectangular pulse voltage of amplitude=5 V and pulse width of 10 ms. Plot the results of each resistor value from t=0 to t=20 ms on the same graph (3 graphs-impulse response, capacitor voltage, and resistor voltage). Label all axes, put a grid on the graph, and apply the proper legend. Comment on and explain the results.

For all cases of the study, the capacitor will have a value of 1 µF. Use the function below to make graphs.

function [ Vc Vr t ] = rc_voltages( A,R,C,T,Tend )

t=0:0.0001:Tend;

for i=1:length(t)

if t(i)

Vc(i)=A*(1-exp(-t(i)/(R*C)));

Vr(i)=A*exp(-t(i)/(R*C));

else

Vc(i)=A*(exp(T/(R*C))-1)*exp(-t(i)/(R*C));

Vr(i)=A*(1-exp(T/(R*C)))*exp(-t(i)/(R*C));

end

end

end

Discuss the role of a substation in a power system?

what is the customer sagment and key resources for IR WIRLESS CHARGER

Problem: A PM DC motor has the following parameters:

Rated Power 10 hp;

Rated armature voltage 230 V-DC;

Rated RPM: 1800;

Armature Resistance: 0.2 Ohm

Armature Inductance: 0.005 H

Inertia (motor plus mechanical load): 0.1 kgm^2;

Viscous friction coefficient: 0.015 Nms

1. Compute the voltage constant of the motor. Also compute the rated current and rated torque of the motor (obtained at the rated RPM). If the motor is supplied by 230 V across the armature, and the only torque from the load is friction, compute the motor armature current and speed. Repeat, if in addition to friction, a 30 Nm counter torque is present at the load.

2. Provide the mathematical equations that describe the motor. Also provide a block diagram (using sdomain TF blocks) to represent the mathematical equations. Reduce the block diagram to a single block TF from the armature voltage to the speed. Find the poles and zeros of the TF.

3. Use the previous block in MATLAB rltool and design a PI controller to control the motor speed. The target performance parameters are:

a. Speed overshoot less than 5%

b. Settling time of speed response less than 1.5 s

4. If the above controller is implemented by a 4Q dc-dc converter, what should be the dc voltage?

5. Simulate the complete closed-loop system (along with a representation of the dc-dc regulator) in

Simulink. Obtain the response to a speed reference step change from 0 to 188.5 r/s. Also obtain the

response to a load torque increase from 0 to 30 Nm while the motor speed reference is 188.5 r/s.

Provide plots of the speed, armature voltage and armature curr

select an energy alternative to coal.

1) Explain the system engineering tradeoffs based on estimated performance, cost, schedule, or other relevant factors.

2) Explain the decision process and analysis tools used in making your decision.

3)Identify and explain any federal acquisition regulations that affected your decision.

1) Course is Computers in BioMedicine

In about 250 words , Discuss Use of fuzzy logic in biomedical expert systems and diagnosis.

Design an ECG amplifier using 3 operational amplifiers for standard (AHA) specifications.

What is the importance of measuring current in the clockwise direction?

In this exercise, you will be given a system with their input/output relationships. Using MATLAB, determine whether the system below are a) linear/non-linear b) time-invariant/timevariant, c) causal/noncausal, d) has memory/memoryless:

y[n] = x²[n]

Provide MATLAB code and graphs to show your work for the linearity and time-invariance testing

Perform an internet information search on the terms “Bipolar Junction Transistors” (or “BJT”) and “MOSFET”. Extract relevant information and write a ONE-PAGE explanation on how one can use such devices for building amplifiers and digital logic switches (or “gates”). Which device, BJT or MOSFET, is more suitable for ultra-low power applications? What is the main reason?

Using MATLAB, determine whether the system below are a) linear/non-linear b) time-invariant/timevariant, c) causal/noncausal, d) has memory/memoryless:

y(t) = x(t) + x(t -1)

Provide MATLAB code and graphs to show your work for the linearity and time-invariance testing.