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Resonance as a zero-friction limit. Assuming that p, q > 0, for large t > 0, every solution of the equation y + p .y
Resonance as a zero-friction limit. Assuming that p, q > 0, for large t > 0, every solution of the equation y" + p .y +q-y= cos(wt) oscillates sinusoidally with angular velocity w and amplitude G given by the gain function 1 G (w, P, 9) = V( 9 - (2) 2 + p2 (2" That is, the amplitude G of the steady-state periodic response is a function of @, p, q. (a) For fixed p, q > 0, calculate G. (b) For fixed p,q > 0 let M(p, q) denote the maximum value of G as a function of w. Compute M(P, q). (c) Set q = 1 and plot M(p, q) as a function of p > 0. (d) Explain why M(p, q) is proportional to p 1 as p -+ 0
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