Resonance is not a phenomenon

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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Resonance is not a phenomenon reserved for undamped mechanisms. Consider the model:
d'x
dr
+2. +5.x = cos (w t)
dt2
dt
corresponding to a 1 kg mass attached to a spring which has a restoring constant of k = 5 N/m and a damping constant of c = 2
N/(m/s).
(a) Determine the particular solution of the equation, keeping wundetermined. (Note: Do not include the complementary solution
in your answer!)
xp (t) =
Note: To include w, type "omega".
(b) Regardless of initial conditions, in the limit as → ∞ we have that x (t) → x₂ (t). That is, the solution converges
asymptotically to the particular solution. To better understand this response, determine the amplitude in the phase-shifted cosine
form A (w) cos(w t-a) of x₂ (t):
A (w) =
(c) Determine the forcing frequency w which maximize the amplitude A (w) and then determine the maximal amplitude of the
response. (Hint: Consider taking the derivative of A (w)!)
W=
maximum of A (w)
Transcribed Image Text:Resonance is not a phenomenon reserved for undamped mechanisms. Consider the model: d'x dr +2. +5.x = cos (w t) dt2 dt corresponding to a 1 kg mass attached to a spring which has a restoring constant of k = 5 N/m and a damping constant of c = 2 N/(m/s). (a) Determine the particular solution of the equation, keeping wundetermined. (Note: Do not include the complementary solution in your answer!) xp (t) = Note: To include w, type "omega". (b) Regardless of initial conditions, in the limit as → ∞ we have that x (t) → x₂ (t). That is, the solution converges asymptotically to the particular solution. To better understand this response, determine the amplitude in the phase-shifted cosine form A (w) cos(w t-a) of x₂ (t): A (w) = (c) Determine the forcing frequency w which maximize the amplitude A (w) and then determine the maximal amplitude of the response. (Hint: Consider taking the derivative of A (w)!) W= maximum of A (w)
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