Torsional pendulum testing device based on differential capacitor and torsional pendulum decoupling reading method

Abstract

In order to overcome the defect that the coupling of a translational displacement signal and a torsional displacement signal generated by a suspension type torsional pendulum structure in a test affects the test precision, the invention provides a torsional pendulum test device based on a differential capacitor and a torsional pendulum decoupling reading method based on the differential capacitor. When an external force signal acts on the torsional pendulum structure, differential carriers are added to the first displacement detection unit and the second displacement detection unit, the positive and negative of the carriers are further adjusted, and the first displacement detection unit and the second displacement detection unit generate a first displacement signal S1 and a second displacement signal S2 respectively; and the first displacement signal S1 and the second displacement signal S2 are processed, and a rotation displacement signal and a translation displacement signal generated by the torsional pendulum structure are decoupled to obtain a rotation displacement signal and / or a translation displacement signal subjected to noise suppression, so that the torsional pendulum test precision can be effectively improved.

Description

technical field [0001] The present invention relates to the technical field of torsion testing, and more particularly, to a torsion testing device based on differential capacitance and a torsion decoupling reading method. Background technique [0002] With the continuous increase of human space science activities, there are more and more aircraft in space, and the structure is more and more complex, and the requirements for the performance of the aircraft are getting higher and higher. As a thruster that provides power for space vehicles, high-precision space science experiments put forward the requirement of "providing thrust with a resolution of micro-Newton level". The high-precision thrust measurement device is used for ground testing and evaluation of the performance of the micro-thrust, including the precise measurement of the resolution of the micro-thrust generated by the thruster, the thrust range and the dynamic performance of the micro-thrust, so as to ensure a gr...

AI Technical Summary

Problems solved by technology

However, the suspended torsion structure is accompanied by a translational displacement signal during the test, and it is detected by the torsion test device at the same time, which will increase the test noise of the torsion test device, reduce the test signal-to-noise ratio, and ultimately affect the Test accuracy

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