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A machine, largely made of aluminum, is modeled as a simple mass (of 100 kg) attached to ground through a spring of 2000 N>m. The machine is subjected to a 100-N harmonic force at 20 rad>s. Design an undamped tuned absorber system (i.e., calculate ma and ka ) so that the machine is stationary at steady state. Aluminum, of course, is not completely undamped and has internal damping that gives rise to a damping ratio of about ζ = 0.001.
Similarly, the steel spring for the absorber gives rise to internal damping of about ζa = 0.0015.
Calculate how much this spoils the absorber design by determining the magnitude X using equation (5.32).
1. (a) A sine wave at frequency f= 90 Hz is sampled digitally at sampling frequencies fs=200,160 and 50 Hz respectively. For each case, discuss whether there is aliasing. Also for each case, calculate the aliasing (perceived) frequency.(b) Using EXCE..
A design specification report on existing ECT system, detailing the finite element analysis procedure carried out when simulating the design to the loading modes in marine conditions within the second and sixth week of the project.
In 1654 Otto von Guericke, Burgermeister of Magdeburg and inventor of the air pump, gave a demonstration before the Imperial Diet in which two teams of horses could not pull apart two evacuated brass hemispheres. (a) Show that the force F required to..
A cannonball is shot from a boat that's initially moving at 3 m/s in the i direction and subsequently strikes the dock at 300 m/s. The cannonball's mass is 5 kg and the boat's mass is 300 kg. Assume that for all the time that the cannonball was being..
1-listening is often the most important aspect of good communication. why is this factor often ignored? what can
If the cost of heat loss rises by $200 per year (uniform gradient) after the next year and the owner plans to keep the present building for 15 more years, what would you recommend if the interest rate is 10% per year?
How does artificial aging affect KIC in a 7075 alloy? Which is likely to have a higher KIC: 7075-T6 or 7075-T7? Explain.
Determine the number of storage bits required in the controller memory so that the accuracy of the joint is as close as possible to, but less than, its repeatability. Use six standard deviations as the measure of repeatability.
A torsional helical spring is used to hold a door closed. The handle on the door is located 30 inches from the center of the torsional helical spring. The pull on the handle should be 1 pound when the door is closed and 3 pounds after the door has ..
What is the resolution error (or quantization error) if a +/- 10V DAQ card has a 3 bits? If a 10 Hz signal is sampled at 45 Hz. For an input frequency of 10 Hz, If you want at least 20 points/second, what should your sampling frequency be? If you wan..
The cold cranking amperes (CCA) of a conventional lead-acid automobile battery is the amount of current the battery can provide at 0°F for 30 seconds and maintain at least 1.2 volts per cell (or 7.2 volts for a standard 12-volt battery).
turbo booster toy that launches a 60-gram insect glider projectile by compressing a helical spring and then releasing
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