Large-stiffness specimen test device for double-array system based on electro-hydraulic servo

Abstract

The invention relates to a large stiffness test piece test device of a dual-stage array system based on electro-hydraulic servo, which uses independent controllers for the dual-stage three-direction six-degree-of-freedom vibration table, and uses a real-time shared memory card for communication between the controllers, thereby realizing In the single working mode, each single three-direction six-degree-of-freedom shaking table does not affect each other, and can run simultaneously to improve the efficiency of the system test. In the dual-stage array working mode, the dual-stage three-direction six-degree-of-freedom vibration table sends the thrust signals of each degree of freedom to the other party in real time, and the two controllers make a difference between the thrust signals of themselves and the other party's respective degrees of freedom to obtain two additional internal force applied to the specimen. After the controller processes and calculates the internal force, the results are superimposed on the respective output driving signals, so that the actuator pushes the surface of the vibrating table to move relative to the direction opposite to the internal force generated. Thereby eliminating the additional internal force exerted on the test piece by the double stage, avoiding damage to the test piece and instability of system control.

Description

technical field [0001] The invention relates to an electro-hydraulic servo-based double-stage array system large-rigidity specimen test device, and belongs to the technical field of electro-hydraulic servo-array system control. Background technique [0002] Shaking table test is the most realistic method to evaluate the nonlinear dynamic response of structural system, and can reproduce the earthquake process more realistically. It is mainly used to verify the correctness of the seismic design theory, method and calculation model of the structure. At present, the electro-hydraulic servo shaking table test is an important means of structural seismic research, and has been widely used. [0003] At present, the more advanced vibrating table generally has three directions and six degrees of freedom, and its typical structure is as follows: figure 1 As shown, four actuators (numbers: Z1, Z2, Z3, Z4) are installed along the vertical direction Z on the vibration table, and two actu...

AI Technical Summary

Problems solved by technology

[0008] 3.1. When the stiffness of the test piece is very high, the small displacement error between the two tables will cause additional internal force of the test piece, resulting in unexpected damage to the test piece. The existing technology does not fully consider the influence of this factor

[0010] 3.3. In the prior art, one controller is generally used to control multiple vibrating tables that form a table array. When used as a single table, only one single table can be controlled for testing at the same time, and other single tables are in an idle state, which reduces the use efficiency.

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