A linearized force correction iterative mixed test method for nonlinear models

Abstract

The invention relates to a nonlinear model linearization force correction iterative mixed test method, in particular to an iterative mixed test method with repeatability in application and test loading, and belongs to the application field of structural mixed test technology. The purpose is to solve the problem of slow iterative convergence due to the round difference between the reaction force of the specimen and the equation to be obtained when the equation of motion is solved in the traditional time course level iterative hybrid test method. The invention divides the overall structure into a test substructure and a numerical substructure, and simultaneously establishes a linear numerical model of the test substructure according to prior knowledge. The full-time response of the test substructure is obtained by numerical calculation of the overall structure, the full-time reaction force is obtained by full-time servo loading of the test substructure, and the displacement and velocity responses of the test substructure of two adjacent iterations are used to bring in It is assumed that the linearized model performs force correction on the reaction force, and the correction force is brought into the motion equation to participate in the numerical calculation, so as to improve the solution accuracy of the motion equation, thereby increasing the iterative convergence speed.

Description

technical field [0001] An iterative hybrid test method based on nonlinear model linearization force correction, which relates to a repeatable iterative hybrid test method applied to the test loading part, specifically involving fields including but not limited to civil engineering, transportation, bridges, Aerospace field, mechanical field, etc. For example, the method can be used for force-corrected iterative hybrid tests of high-speed train shock absorbers, force-corrected iterative hybrid tests based on concrete structures equipped with various dampers, and so on. Background technique [0002] The hybrid test method is a new type of seismic test method that combines physical loading of real specimens and computer numerical simulation. By loading real specimens, more accurate test results can be obtained, and computer numerical simulation can greatly reduce test costs. , to improve the applicability of the test, and to carry out real-time calculation by establishing data ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the low calculation efficiency of the numerical substructure in the current real-time hybrid test, it is difficult to achieve real-time performance of the test. At the same time, the traditional time course level iterative hybrid test method has a round difference between the specimen reaction force and the obtained equation when the motion equation is solved, resulting in iterative To solve the problem of slow convergence speed, the present invention proposes a nonlinear model linearization force correction iterative mixed test method, the specific scheme is as follows:

Images