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    In my textbook it states "as applied frequency increases, the phase difference between the displacement and the periodic force increases from 0 to pi/2 at the maximum amplitude, and then from pi/2 to pi as the frequency increases further".
    I don't understand what this means. Which graphs does this refer to?
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    (Original post by IDontKnowReally)
    In my textbook it states "as applied frequency increases, the phase difference between the displacement and the periodic force increases from 0 to pi/2 at the maximum amplitude, and then from pi/2 to pi as the frequency increases further".
    I don't understand what this means. Which graphs does this refer to?
    The time-varying force that is applied and the dynamical response of your system can be represented by a plot of amplitude vs phase or time.
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    (Original post by IDontKnowReally)
    In my textbook it states "as applied frequency increases, the phase difference between the displacement and the periodic force increases from 0 to pi/2 at the maximum amplitude, and then from pi/2 to pi as the frequency increases further".
    I don't understand what this means. Which graphs does this refer to?
    Name:  Forced_Vibration_Response.png
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Size:  82.8 KB

    It refers to the graph on the right. Note the applied frequency  f is normalized with natural frequency  f_0 .
 
 
 
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