I am working on free response of a non-linear, 2 degrees of freedom vibration system. I have developed mathematical model and implemented it in Simulink. As there are 2 DOFs, so the system's response will be something like this: x_1=10*(sin5t+cos3t) and x_2=-5*(sin5t-cos3t). I have graphs of x_1 and x_2 vs time. How can I determine the frequencies from these graphs when I don't have analytical solutions. Thanks
MATLAB: Determining frequecnies from plot
frequencysignalsimulinkvibration
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