An automated test platform for stiffness parameters of complex structures

Abstract

The present invention discloses a complex structure stiffness parameter automation test platform. The fixed end of a joint part to be tested is connected with a tool platform installed at the bottom portion, and a loading end is connected with a loading beam through a switching flange; the two ends of the loading beam is provided with force sensors, one ends of steel wire ropes are connected with the force sensors, and the other ends of the steel wire ropes are connected with loading mechanisms through bypassing fixed pulleys; the loading mechanisms apply tensile forces having corresponding directions and sizes at two sides of a tested object to realize loading; and the loading mechanisms apply tensile or compressive loading at the two sides when the tensile forces are equal and in the same direction, and the loading mechanisms apply crankling load when the tensile forces are not equal and in the opposite direction. In the test process, the feedback signals of the force sensors are input into the PID feedback controller in the computer to determine the control signals of the loading mechanisms to realize automatic loading of the loading mechanisms; after the loading is end, the object to be tested is stable in deformation to automatically collect the experiment data of all the test points through a data collector; and after all the experiments are completed, the data processing software is employed to process the experiment data to obtain the stiffness parameter of the joint part to be tested through combination of the linear fitting method.

Description

technical field [0001] The invention relates to the field of test and measurement of stiffness parameters of complex structures, specifically an automated testing platform for stiffness testing of complex structures, which can realize tensile and compressive, bending, and torsional stiffness of various structures, multiple working conditions, and multiple directions Automated loading of parameters and data acquisition. Background technique [0002] The space robotic arm has precise operation capabilities and visual recognition capabilities. Its main purpose is to perform automatic and precise docking by capturing transport spacecraft, and it is safer, faster, and more efficient than traditional docking methods. The space manipulator is a high-end aerospace equipment integrating the disciplines of mechanics, vision, dynamics, electronics and control. Its internal structure is complex and contains multiple driving components, so it is difficult to obtain accurate and reliable...

AI Technical Summary

Problems solved by technology

[0003] (1) The manual loading scheme puts forward high requirements for manual operation during loading, that is, while maintaining a large load, fine adjustments must be made to make it reach a predetermined value, and the steel wire rope has a strong rigidity. Therefore, the load will inevitably fluctuate to a certain extent (about ±5N) during the test process, which is difficult to measure stably and affects the measurement accuracy;

[0004] (2) The method of manual reading and recording of data is inefficient. On the other hand, the process of manual reading and manual typing is not only procrastinating and slow, but also must be coordinated, which is easy to introduce accidental errors and affect the accuracy of test results;

[0005] (3) The test task requires that in a stiffness test experiment, there are at least three groups of stiffness test results in one direction of the same component under test, and each group collects at least about 60 test points, so the complete experimental process includes at least hundreds of times of loading and unloading , the experimenter is prone to fatigue after repeating the test many times, and the possibility of introducing accidental errors is greatly increased

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