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(Solved): (4) assume excitation at phase resonance: (a) calculate the excitation frequency \omega in ra(d)/( ...



(4) assume excitation at phase resonance: (a) calculate the excitation frequency

\omega

in

ra(d)/(s)

and

f

in Hz (b) calculate period of oscillation

\tau

(c) Plot the time response for

N_(osc)=10

oscillations. Hint: plot the real part of the complex displacement

u(t)

(5) Graduate work: (a) plot the magnitude and phase of the frequency response function FRF vs. excitation

fHz

from quasi-static to 5 times the phase resonance frequency (b) calculate the FRF magnitude at phase-resonance RPM and at double the phase resonance RPM (c) calculate the vibration magnitude when the electric motor runs at its operational RPM (d) comment on what vibration would be observed as the motor is started and accelerated to reach its operational RPM



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