A multi-actuator real-time hybrid simulation test method for space structures
A technology of mixed simulation and test methods, applied in the fields of instruments, special data processing applications, geometric CAD, etc., can solve the problems of inconsistent sampling frequency between the computer and the actuator, inaccurate loading, and few measurement signals, and achieve real-time mixed simulation test. The process is fast and complete, the scope of the project is wide, and the effect of eliminating the time difference of calling each other
Active Publication Date: 2021-12-07
SOUTHEAST UNIV
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Problems solved by technology
[0005] In the multi-actuator real-time hybrid simulation test of the space structure, due to the large number of degrees of freedom of the space structure, it is necessary to increase the step size to ensure sufficient calculation time, resulting in inconsistent sampling frequencies between the computer and the actuators
The situation at the junction of numerical / experimental substructures is also more complicated. Due to the limited number of actuators, the obtained measurement signals are less, and the measurement signals are usually not enough to meet the force balance conditions at the junction.
When multiple actuators load the same point, there is a coupling effect in the displacement, which will cause a deviation between the actual displacement and the target displacement, resulting in inaccurate loading
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[0037] The first step: using the appropriate boundary conditions and assumptions, the study will be simplified spatial model structures. According to the test object and the position of non-linear structure, the overall structure of the constitutive relation generally clear, easy finite element simulation substructure portion as a numerical value, it is difficult to accurately simulate the finite element, part of the test requires a test study substructure. The coordination of the displacement and the force balance condition values / test substructure need to meet at the junction, to determine the value / test data sub-structure interaction between. Numerical substructure model parameters defined on the computer, designed in the laboratory test specimens and substructures actuator loading.
[0038] Step two: Select multiple seismic waves as an incentive to establish the structure of kinematic equations based on the finite element model space. Mass matrix equation centralized mas...
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A multi-actuator real-time hybrid simulation test method for space structures. The structure is divided into numerical and experimental substructures. The calculation of the numerical substructure is divided into two parts: unit force calculation and motion equation solution. The experimental substructure uses Multiple actuators are loaded at the same time; displacement decoupling is performed on each actuator to offset the displacement coupling effect when multiple actuators load the same point, and then time-delay displacement compensation is performed; by calculating the command displacement under the calculation step according to The sampling frequency is interpolated, and the measured force signal of the actuator is extracted according to the calculation step, so that the computer and the frequency of the actuator signal are consistent; the supplementary calculation is based on the less measured force of the actuator and the estimation of the specimen to meet the junction force. The feedback force required for the balance condition; finally start the test to complete the whole process, and evaluate the test effect according to the calculated error index.
Description
Technical field [0001] The present invention relates to a real-time simulation test hybrid multi actuator for a spatial structure, in particular, to a structure to make more space for a solution to the problem of real-time critical mixing simulation test in the actuator. Background technique [0002] The traditional method of seismic test structure includes a quasi-static test, pseudo-dynamic test and vibration test table. Quasi-static test economical and practical, but not fully reflect the dynamic characteristics of the structure. Dynamic experimental tests using numerical simulation in combination with still fall within the scope of the static test, the test piece does not reflect the speed correlation. High accuracy shaking table test, but the cost is high and affected the bearing capacity limit and size effect. [0003] A new test method for real-time simulation test mixture is developed on the basis of the proposed dynamic test, also known as real-time dynamic experimental ...
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IPC IPC(8): G06F30/13G06F119/14
CPCG06F30/13G06F2119/06
Inventor 郭彤陈梦晖徐伟杰黄亮
Owner SOUTHEAST UNIV