Figure 1 is a very powerful plot as it tells us what frequency will produce maximum steady state response for our system in differential equation (1). Indeed, for the parameters here we find that ωmax = 3.24037 radians/second and the maximum steady state amplitude is 0.093352 m. a) Find the range [ωLow, ωHigh] surrounding ωmax such that all responses are at or above 90% of the maximum steady state amplitude of 0.093352 m.

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Figure 1 is a very powerful plot as it tells us what frequency will produce maximum steady state
response for our system in differential equation (1). Indeed, for the parameters here we find that
ωmax = 3.24037 radians/second and the maximum steady state amplitude is 0.093352 m.

a) Find the range [ωLow, ωHigh] surrounding ωmax such that all responses are at or above 90% of
the maximum steady state amplitude of 0.093352 m. 

ssAmp[w] =Sqrt [Coefficient[ys[t, w], Cos[t w]]²
+ Coefficient[ys[t, w], Sin[t w]]] // Simplify
When we finish this computation we have a nice closed form solution for the amplitude of our
steady state frequency response as a function of the input frequency w with all the other parameters
of our system present as well.
ssAmp(w)
(2)
As an example, consider the following parameters, m = 1 kg, k = 15 N/m, c = 3 N/(m/s),
and Fo= 1 N. We plot the curve of Maximum Steady State Amplitude vs. Input Frequency w in
Figure 1.
Max SteadyState Amp
0.08
0.06
0.04
0.02
5
F3
c²w²+k² - 2kmw² + m²w4
10
15
20
25
Figure 1. Maximum Steady State Amplitude vs. Input Frequency.
Input Frequency
Transcribed Image Text:ssAmp[w] =Sqrt [Coefficient[ys[t, w], Cos[t w]]² + Coefficient[ys[t, w], Sin[t w]]] // Simplify When we finish this computation we have a nice closed form solution for the amplitude of our steady state frequency response as a function of the input frequency w with all the other parameters of our system present as well. ssAmp(w) (2) As an example, consider the following parameters, m = 1 kg, k = 15 N/m, c = 3 N/(m/s), and Fo= 1 N. We plot the curve of Maximum Steady State Amplitude vs. Input Frequency w in Figure 1. Max SteadyState Amp 0.08 0.06 0.04 0.02 5 F3 c²w²+k² - 2kmw² + m²w4 10 15 20 25 Figure 1. Maximum Steady State Amplitude vs. Input Frequency. Input Frequency
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