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Unformatted text preview: What effect does the series damper-spring have on the frequency response? This system is often used to model elastomer mounts and bushings. 2 PROBLEM 4: (20%) Find and plot the approximate frequency response function of the single degree of freedom system below that is subjected to Coulomb friction and a simple harmonic input, F i cos( t) . Assume the damping force, Nsgn(dx/dt) , is small compared to the excitation amplitude, F i , so that the steady state response can be assumed to be harmonic at the excitation frequency. Recall that the energy dissipated by Coulomb friction per cycle of harmonic oscillation at a frequency is 4NX p , where is the static coefficient of friction, N is the normal force, and X p is the steady state response amplitude at . Find the analytical condition on the friction force such that this solution is valid....
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- Fall '09