The displacement formula of simple vibration is generally A*sin(wt+b)

The velocity formula is wAcos(wt+b) after differentiating the displacement formula

< p>where A is the amplitude, WA is the vibration speed, and W is the angular velocity of vibration.

This is a conversion method for single-frequency vibration. In actual application, the vibration is a composite of multiple frequencies. At this time, the main frequency must be found. For mechanical rotation, the main frequency generally refers to the frequency of the rotor rotation