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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).
A centrifugal pump, weighing 600N and operating at 1000 rpm, is mounted on six springs of stiffness 6000 N/m each. Find the maximum permissible unbalance in order to limit the steady-state deflection to 5mmm peak-to-peak.
air flows on both sides of a counterflow heat exchanger operating at steady state with a mass flow rate of 1 lbs on
steam enters the nozzle of a turbine with a low velocity at 3 mpa 350degc and leaves the nozzle at 1.6 mpa at a
a stream of saturated liquid water at 25 c is added to a 3 kgs stream of steam with a pressure of 5 bar and temperature
The area under an engineering stress-strain curve up to fracture is the en- ergy/volume. The area under a true stress-strain curve up to fracture is also the energy/volume. If the specimen necks, these two areas are not equal.
The brass strip AB has been attached to a fixed support at A and rests on a rough support at B. Knowing that the coefficient of friction is 0.60 between the strip and the support at B, determine the decrease in temperature for which slipping will ..
a wind tunnel has a 1-m2 6-m-long test section in which air at standard sea-level conditions moves at 70 ms. it is
Compute the force P required to slide the door at a steady speed if wheel A becomes "frozen" and does not turn in its bearing.
in many countries in south america chunks of cassava root containing 65 percent water are dried to 5 percent water then
showing the two upward pulls of the rings on his hands, each of size 380N. Calculate the angle between the wires supporting the rings and the vertical.
When a compressed gas storage tank fails, the resultant explosion occurs so rapidly that the gas cloud can be considered adiabatic and assumed to not mix appreciably with the surrounding atmosphere.
A cylindrical pressure vessel has an internal pressure of 500 kPa, 6-mm wall thickness, and an outside diameter of 1.4 m. What is the absolute largest shear stress in the wall of the vessel? What is the largest normal stress?
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