A six-degree-of-freedom dual electro-hydraulic shaking table array simulation system disturbance force compensation method

Abstract

The invention discloses a disturbing force compensation method of a six-degree-of-freedom double-electro-hydraulic shaking table array simulation system. The six-degree-of-freedom double-electro-hydraulic shaking table array simulation system comprises a lower platform, an upper platform, a pier, a bridge plate, ten valve-controlled cylinder mechanisms and three reaction walls. According to the disturbing force compensation method of the six-degree-of-freedom double-electro-hydraulic shaking table array simulation system, by collecting pressure difference signals of two cavities of hydraulic cylinders and acceleration signals of hydraulic piston rods in the ten valve-controlled cylinder mechanisms, and a disturbing force compensation signal is obtained through calculation. Driving signalsof the valve-controlled cylinder mechanisms are adjusted by using the disturbing force compensation signal, so that the purpose of improving the control precision of the shaking table array simulationsystem is achieved. According to the disturbing force compensation method of the six-degree-of-freedom double-electro-hydraulic shaking table array simulation system, the fluctuation of the amplitude-frequency characteristic of a closed-loop transfer function at a transverse freedom position at 20dB near 8Hz can be reduced within 5dB, and the control precision of the shaking table array simulation system is obviously improved.

Description

technical field [0001] The invention relates to a six-degree-of-freedom dual electro-hydraulic vibrating table, in particular to a method for compensating disturbance force for a simulation system of a six-degree-of-freedom dual electro-hydraulic vibrating table. Background technique [0002] Electro-hydraulic vibration table is an important equipment for vibration environment simulation, widely used in aerospace, automobile, ship, bridge and civil engineering construction and other fields. With the development of science and technology, the structural size of the test piece is becoming more and more complex, and it is difficult for a single shaking table vibration simulation test to achieve the specified motion state to simulate the real vibration environment. The shaking table array simulation system consists of two or more shaking tables, which creates the necessary conditions for the vibration simulation test of long-span structural specimens. [0003] In the design pro...

AI Technical Summary

Problems solved by technology

The existing disturbance force compensation control method for a single multi-degree-of-freedom motion platform cannot be directly applied to a six-degree-of-freedom dual electro-hydraulic shaking table array simulation system

The analysis shows that when the traditional control method is used, affected by the elastic foundation and flexible connection, the amplitude-frequency characteristic of the closed-loop transfer function of the lateral degree of freedom position fluctuates by 20dB around 8Hz, which seriously affects the reproduction accuracy of the given signal in this frequency band

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