Disturbing force suppression method for two-degree-of-freedom electro-hydraulic vibration table

Abstract

The invention discloses a disturbing force suppression method for a two-degree-of-freedom electro-hydraulic vibration table. The disturbing force suppression method comprises the following steps that a two-degree-of-freedom acceleration reference signal is left multiplied by a matrix J and then serves as an input signal of a reference signal generator module; an output signal ra is obtained through the reference signal generator module; the ra is used as an input signal of an integrator 1 module, and an output signal rv is obtained; the rv is used as an input signal of an integrator 2 module, and an output signal rx is obtained; a displacement signal x, a speed signal v and an acceleration signal a of a hydraulic cylinder piston rod of each valve control cylinder mechanism and a pressure difference signal PL of two cavities of a hydraulic cylinder are collected; the signals rx, rv, ra, x, v, a and PL serve as input signals of a disturbing force suppression controller module, and an output signal u of the disturbing force suppression controller module is calculated; and an output signal u of the disturbing force suppression controller module serves as a driving signal of the two valve-controlled cylinder mechanisms and is input into the two valve-controlled cylinder mechanisms to drive the two-degree-of-freedom electro-hydraulic vibration table to move. According to the invention, the control precision of the two-degree-of-freedom electro-hydraulic vibration table is obviously improved.

Description

technical field [0001] The invention relates to a two-degree-of-freedom electro-hydraulic vibration table, in particular to a method for suppressing interference force of a two-degree-of-freedom electro-hydraulic vibration table. Background technique [0002] The multi-degree-of-freedom electro-hydraulic vibration table is the key equipment for simulating the vibration environment of large-scale structures or equipment. By reproducing the acceleration signal measured in the environment, the anti-vibration performance of the structure or equipment in the vibration environment is assessed. It is widely used in aerospace, bridge construction, ships, etc. , vehicles and other fields. The control system is the core technology of the electro-hydraulic vibration table. [0003] The two-degree-of-freedom electro-hydraulic vibration table is driven by two sets of valve-controlled cylinder mechanisms, and has two degrees of freedom of motion, roll and pitch. The controller design of...

AI Technical Summary

Problems solved by technology

Affected by interference factors such as foundation elasticity and flexible connection, the control accuracy of the two-degree-of-freedom electro-hydraulic vibration table system is greatly reduced

Taking the movement of the electro-hydraulic vibration table along the roll degree of freedom as an example, the analysis shows that when the traditional control method is adopted, the time-domain peak error between the acceleration output signal of the roll degree of freedom and the acceleration reference signal is about 60%, which seriously affects the stability of the vibration table. System Control Accuracy

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