Triaxial active shock absorber based on piezoelectric effect and system thereof

Abstract

The piezoelectric effect-based triaxial active shock absorber comprises an actuator, a load substrate and a shock absorber base, the load substrate is provided with a notch, the shock absorber base is provided with a through hole, and the actuator is embedded in the notch of the load substrate and penetrates out of the through hole of the shock absorber base; wherein the actuators comprise radial actuators and axial actuators, and the radial actuators are arranged in the X-axis direction and the Y-axis direction and used for active vibration reduction in the X-axis direction and the Y-axis direction correspondingly; the axial actuator is arranged in the Z-axis direction and used for active vibration reduction in the Z-axis direction. According to the tri-axial active shock absorber based on the piezoelectric effect and the system thereof, active shock absorption in three axial directions can be achieved, the tri-axial active shock absorber has the advantages of being small in size, high in integration degree, good in stability and the like, meanwhile, the tri-axial active shock absorber integrates and has the passive shock absorption capacity, the shock absorption frequency band is wider, and practical engineering application is better facilitated.

Description

technical field [0001] The invention relates to the technical field of vibration reduction, in particular to a piezoelectric effect-based triaxial active vibration damper and a system thereof. Background technique [0002] With the increasing requirements of military equipment on the vibration environment and product structure vibration characteristics, passive vibration isolation has been difficult to meet the requirements due to its poor low-frequency effect and inability to adapt to external disturbance changes. Active vibration reduction technology has a good effect , strong adaptability has important development potential, and has been successfully applied in the field of intelligent manufacturing (lithography machines, machine tools), automotive fields (automobile suspensions, seats), aviation fields (spacecraft, space station experimental platforms) and in other vibration sensitive equipment. [0003] Most of the existing active shock absorbers are unidirectional vib...

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Problems solved by technology

[0003] Most of the existing active shock absorbers are unidirectional vibration reduction, which have poor practical applicability and are difficult to be directly applied to the vibration reduction of military equipment, or realize multi-axial vibration reduction through parallel mechanisms, etc., which are large in size and poor in versatility; such as patent No. It is the patent document of CN201921540891.4, which discloses an active shock absorber. The right outer wall of the oil storage cylinder is designed with a solenoid valve at the flow device. The third oil through hole of the flow device is connected with the oil inlet hole of the solenoid valve. The oil outlet hole of the valve communicates with the second oil passage, and the solenoid valve controls the flow of oil through the magnitude of the current to achieve active vibration control. This structure is based on a hydraulic shock absorber, which has a large axial dimension and can only achieve axial vibration. Vibration control; the patent document with the patent number CN201911108027.1 discloses an active vibration reduction platform for military computer cabinet applications, which has a passive vibration reduction system and an active vibration reduction system. Cooperate to achieve effective control of vibration in the full frequency band, but its active vibration reduction and passive vibration reduction are independent, and the axial actuators are independent of each other. The entire vibration reduction system is poorly integrated and low in integration; the patent number is CN201811196314.8 The literature discloses a three-dimensional active vibration reduction control system, which can calculate the measured vibration on the platform and obtain a feedback signal. Based on the feedback signal, the three-dimensional active vibration reduction device is driven to offset the residual vibration to improve the vibration isolation effect, thereby improving Compared with the existing passive vibration isolation, the measurement accuracy of precision instruments is greatly enhanced, so that it can meet very strict vibration isolation requirements, but its controllable frequency is only 1-150Hz, which is difficult to meet the vibration environment of military equipment test

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