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Earthquake simulation vibrostand control method

A control method and seismic simulation technology, applied in the field of structural experiments, can solve the problems of insufficient high-frequency acceleration control accuracy and low-frequency displacement control accuracy.

Active Publication Date: 2018-02-13
BEIJING UNIV OF TECH
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Problems solved by technology

[0003] In order to overcome the disadvantages of poor low-frequency displacement control accuracy and insufficient high-frequency acceleration control accuracy of the existing three-parameter control method, the present invention introduces the displacement error integral and acceleration differential physical quantity into the closed-loop control link of the earthquake simulation shaking table, thus forming an earthquake Analog shaker control method

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Embodiment Construction

[0121] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0122] Implementation steps of the present invention are as follows:

[0123] (1), from the three continuity equations of the hydraulic system through Laplace transformation:

[0124]

[0125] In the formula, M is the load mass; x is the displacement; A p is the effective bearing area of ​​the piston; p L is the load drop; Q L is the load flow rate; V is the volume of the control chamber; β is the elastic modulus of the oil; C c is the leakage coefficient; k q is the flow gain of the slide valve near the steady-state operating point; K c is the flow pressure coefficient of the slide valve near the steady-state operating point; s is the Laplace change factor; E is the displacement of the slide valve spool.

[0126] The open-loop transfer function of the system obtained by simplification of the three continuous equations is:

[0127]

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Abstract

The invention relates to an earthquake simulation vibrostand control method, which belongs to the technical field of structural experiment. According to the control method, a differential signal of anacceleration instruction signal and a differential signal of an acceleration feedback signal are obtained by virtue of differentiation, a difference between the displacement feedforward and feedbackis integrated to obtain a displacement error integral signal, summation is performed for the acceleration instruction differential signal, the acceleration feedback differential signal and the displacement error integral signal and the known three parameter instruction signal, thereby obtaining a composite multi-parameter control signal. Compared with the existing three-parameter control method, the acceleration feedback differential signal in the multi-parameter control algorithm can reduce the influence of system resonance frequency and can increase the system bandwidth; the acceleration instruction differential signal can increase the system frequency band and can improve the system high-frequency performance; and the displacement error integral signal can reduce a displacement static error of a multi-vibrostand system and can improve the low-frequency control performance of the system.

Description

technical field [0001] The invention relates to a method for controlling an earthquake simulation shaking table, belonging to the technical field of structural experiments. Background technique [0002] Earthquake simulation shaking tables are the most direct and effective experimental research tools in the field of engineering earthquake resistance. Represented by the United States, Japan, China and the United Kingdom, hundreds of earthquake simulation shaking tables of various sizes have been built in the world. With the rapid development of fields such as hydraulics, electronics, sensors, signal processing and control, the earthquake simulation vibration table has realized the transformation from analog control to digital control, from displacement PID control to acceleration feedback control, and then by displacement, velocity and acceleration Three-parameter control becomes the basic algorithm of shaking table control. At present, most of the electro-hydraulic servo se...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M7/02
CPCG01M7/022
Inventor 纪金豹李芳芳李小军刘佳航
Owner BEIJING UNIV OF TECH
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