A method for suppressing the interference force of a two-degree-of-freedom electro-hydraulic vibration table

Abstract

The invention discloses a method for suppressing interference force of a two-degree-of-freedom electro-hydraulic vibrating table, which comprises the following steps: taking the two-degree-of-freedom acceleration reference signal as an input signal of a reference signal generator module by multiplying it to the left by a matrix J; module output signal r a ; will r a As the input signal of the integrator 1 module, the output signal r v ; will r v As the input signal of the integrator 2 module, the output signal r x ; Collect the displacement signal x, velocity signal v, acceleration signal a of the hydraulic cylinder piston rod of each valve-controlled cylinder mechanism and the pressure difference signal P between the two chambers of the hydraulic cylinder L ; put the signal r x 、r v 、r a , x, v, a, P L As the input signal of the interference force suppression controller module, calculate the output signal u of the interference force suppression controller module; use the output signal u of the interference force suppression controller module as the driving signal of the two valve-controlled cylinder mechanisms, and input it to the two valves The cylinder control mechanism drives the movement of the two-degree-of-freedom electro-hydraulic vibration table. The invention obviously improves the control precision of the two-degree-of-freedom electro-hydraulic vibrating table.

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 a key device for simulating the vibration environment of large structures or equipment. By reproducing the acceleration signal measured in the environment, it can evaluate the anti-vibration performance of the structure or equipment in the vibration environment. It is widely used in aerospace, bridge construction, ships. , vehicles, etc. 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 movement: roll and pitch. The controller design of the traditional two-d...

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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