Vibrations
Flow Measurements
Statistics
Robot Lab
Other
100
What is the equation for the natural frequency of a single degree of freedom system?
Sqrt(k/m)
100
What is Pressure?
Force/Area
100
What is accuracy?
Accuracy is the closeness of agreement between the measured value and the true value
100
Actuator is a device or mechanism that does what?
It produces motion.
100
Where does the references section come in a typical report? (after and before what)
After the conclusion and before the abstract)
200
Write on the board the differential equation of a single degree of freedom system with damping and a harmonic input force. in standard form.
x..+(c/m)x.+(k/m)*x= (F/m)*e^(iwt)
200
What is the value of atmospheric pressure at sea level?
14.7lb/in
200
How is uncertainty quantified?
Using Statistics and Probability
200
Name three different types of actuators
Pneumatic, Hydraulic, Electric, Smart Materials, Others
300
A spring is attached to a wall, then attached to a rigid mass. On the other side of the mass another spring is attached. That spring is attached to another mass. How many mode shapes are possible in the system?
Two masses are free to move independently, so there are two degrees of freedom, and thus two natural frequencies and two modes
300
What is a barometer?
A device that measures atmospheric pressure using a tube filled with (typically) mercury.
300
Explain the difference between X' and Xbar
X' is the mean value of the entire population. Xbar is the average of a subset of samples collected from the population.
300
Explain the key features of a stepper motor including its torque and position control abilities.
A stepper motor has relatively low torque but has fine precision of position due to its ability to share the electric field between electromagnets next to each other within the radial array.
300
If you are interested in determining the bending stresses in a rod what kind of finite element would give you the fastest solution?
A beam element with appropriate dimensional and material properties assigned.
400
A simple SDOF system as shown in class has a mass of 5kg and a spring constant of 6kg/m. Determine the required viscous damping value you need to make the system critically damped.
10.95 N*s/m
400
A U-tube manometer is used to measure the pressure in a tank that is pressurized with air. One end of the manometer is connected to the tank, and the other end of the manometer is open to atmosphere. If the pressure in the tank is 200 kPa, what is the approximate deflection (difference in height of the water columns) of the manometer? You may make the following assumptions: density of mercury = 13500 kg/m3, density of air = 1 kg/m3, diameter of the tube = 1 cm, atmospheric pressure = 103 kPa. Assume a constant tube diameter.
.732 m
400
Name three different statistical distributions.
Normal, Log Normal, Rectangular, Triangular, Wiebull (as mentioned in class), and others
400
Explain in detail the differences between PWM and PPM
PWM controls power delivery and PPW is a method to send data to a controller.
400
If the DAQ you are using can measure 10v and you are measuring a 12.3v signal what phenomena might you expect in the recovered signal?
High frequency aliasing.
500
Calculate the MAC value for An analytical value of [1 3 1 2]^T and experimental of [2 1 0 4]^T What is the MAC and determine if this is an acceptable value.
The MAC is .5365. This is NOT an acceptable value.
500
What kind of gauge did we use to measure pressure in the Fan lab? Explain the method in which it works.
Diaphragm gauge.
500
If you take five samples from a population and the values are 1.01, 1.03, 1.06, 1.11, and 1.17 What is the sample average and the 95% uncertainty on that value?
1.076 +- .166
500
If a servo controller requires 120v and 2 amps to operate what is an appropriate maximum shunt resistor given what you know about the robotics lab?
18v is the max voltage drop. thus the max resistance for a 2 amp flow is 9 olms
500
Explain and draw on the board the key differences between a fixed and free boundary condition for a 1d and 2d case.
Explain.
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