A mass-spring motion is governed by the ordinary differential equation d²x dx +b + k(t)x= F(t), dt² dt m where m is the mass, b is the damping constant, k is the spring constant, and F(t) is the external force. We consider the initial conditions x(0) = 1 and x/(0) = 0. Assume the following numerical values for this part of the project: m = 1, k = 1/5, b= 1/5, and F(t) = cos yt. 1 (a) Read section 4.10. Explain what is the resonance frequency, and then compute the resonance frequency for this mass-spring system. (b) The ODE45-solver can be used to obtain the solution curves in MATLAB. Use the script Project2_Q2.m to plot the solutions and estimate the amplitude A of the steady response for y = 0.2, 0.42, 0.6, and 0.8. (c) The script also provide you with the graph of A versus y. For what frequency 7 is the amplitude the greatest? Is it equal to that you obtained in (a)?

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A mass-spring motion is governed by the ordinary differential equation
d²x dx
+b + k(t)x= F(t),
dt² dt
m
where m is the mass, b is the damping constant, k is the spring constant, and F(t)
is the external force. We consider the initial conditions x(0) = 1 and x/(0) = 0.
Assume the following numerical values for this part of the project: m = 1, k = 1/5,
b= 1/5, and F(t) = cos yt.
1
(a) Read section 4.10. Explain what is the resonance frequency, and then compute
the resonance frequency for this mass-spring system.
(b) The ODE45-solver can be used to obtain the solution curves in MATLAB. Use
the script Project2_Q2.m to plot the solutions and estimate the amplitude
A of the steady response for y = 0.2, 0.42, 0.6, and 0.8.
(c) The script also provide you with the graph of A versus y. For what frequency
7 is the amplitude the greatest? Is it equal to that you obtained in (a)?
Transcribed Image Text:A mass-spring motion is governed by the ordinary differential equation d²x dx +b + k(t)x= F(t), dt² dt m where m is the mass, b is the damping constant, k is the spring constant, and F(t) is the external force. We consider the initial conditions x(0) = 1 and x/(0) = 0. Assume the following numerical values for this part of the project: m = 1, k = 1/5, b= 1/5, and F(t) = cos yt. 1 (a) Read section 4.10. Explain what is the resonance frequency, and then compute the resonance frequency for this mass-spring system. (b) The ODE45-solver can be used to obtain the solution curves in MATLAB. Use the script Project2_Q2.m to plot the solutions and estimate the amplitude A of the steady response for y = 0.2, 0.42, 0.6, and 0.8. (c) The script also provide you with the graph of A versus y. For what frequency 7 is the amplitude the greatest? Is it equal to that you obtained in (a)?
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