Research on Relative Velocity Feedback Technology for a Low-Frequency Standard Vibration Table

Relative velocity feedback is a method that is used to improve the low-frequency characteristics of a standard vibration table. Under limited mechanical conditions, the distortion of the low-frequency band of the vibration table is greatly reduced by using relative velocity feedback. However, there is a resonance peak in the passband of the vibration table system. When the resonance peak is too large, the vibration table generates a self-excited oscillation, which affects the expansion of the frequency characteristics of the vibration table. This paper presents a simplified circuit model and theoretical derivation for such vibration table. The relationship between the resonance peak and the parts of vibration table is given by theoretical derivation and verified by a simulation and an experiment. Then, a method for reducing the resonance peak is also provided and verified.