Electro-hydraulic servo vibration table resonance suppressing method

Abstract

The invention provides a resonance suppression method for an electrohydraulic servo vibration bench. A random wave signal is generated by utilizing a signal generator, the frequency characteristic curve of the electrohydraulic servo vibration bench is measured, and the position of the resonance peak is found out; the frequency of the reference signal of an adaptive notch filter is the frequency ofthe resonance peak of the vibration bench; an error signal can be acquired from the difference of the input acceleration speed and the acceleration response signal of the electrohydraulic servo vibration bench; an LMS adaptive filtering algorithm adjusts the weight of the adaptive notch filter online in real time according to the error signal, an output of the adaptive notch filter is acquired from the reference signal of the adaptive notch filter after the weighting effect of the weight, and the output signal and the acceleration speed input signal added as a new input signal of the vibration bench to affect on the vibration bench. The invention is easy to be realized through the digital control of a computer, and the suppression to the resonance peak can be realized on line in real time, therefore, the bandwidth of the vibration bench can be expanded, and the reproducing precision of the power spectrum can be improved.

Description

(1) Technical field [0001] The invention relates to a resonance suppression method, in particular to a method for self-adaptive suppression of the resonance peak of an electro-hydraulic servo vibration table, which belongs to the field of mechanical engineering. (2) Background technology [0002] Vibration is a special load. For various research objects, vibration exists in its operation mode and its use environment. During operation, the vibration excitation mainly comes from the interaction between the object and its carrier, such as the excitation of the interaction between the vehicle and the ground during the running of the vehicle, the excitation of the propeller rotation and wave impact of the ship, and the interaction between the shell and the air during the high-speed flight of the aerospace vehicle. Frictional incentives, etc. In addition, the vibration during use comes from the periodic mechanical motion of the object itself or the installation area or the excita...

AI Technical Summary

Problems solved by technology

On the one hand, this limits the expansion of the frequency bandwidth of the electro-hydraulic servo vibration table, and on the other hand, it is also the main reason that causes the power spectrum reproduction control error to exceed the limit.

Judging from the literature and patent results found, no one has studied the resonance suppression of electro-hydraulic servo vibration tables at home and abroad.

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