System for accurately testing friction damping

Abstract

The invention discloses a system for accurately testing friction damping. The system comprises a piston, a damping sealing member, a sleeve, a piston rod, force sensors, a cutting sleeve coupler, a displacement sensor, a driving motor, a measurement control platform, an experiment table body and a sleeve centering adjusting rod. The piston, the damping sealing member and the sleeve are matched together to simulate a moving part structure of a liquid rocket valve, and then are assembled together with the experiment tale body and the sleeve centering adjusting rod to form an experiment table of friction testing system; the piston is in rigid connection with the driving motor through the piston rod and the cutting sleeve coupler; the force sensors at two ends of the sleeve and the displacement sensor of the driving motor are connected with the measurement control platform; and the driving motor is connected with the measurement control platform to form a control test bed of the friction testing system. The system provides a valve piston friction structure for simulating reality, adopts a driving mode combining direct driving and macro-micro motions, and has the advantages of automatic control, high control accuracy, high reciprocating frequency, large motion stroke, high dynamic frictional force measurement accuracy and the like.

Description

technical field [0001] The invention relates to an accurate testing system for frictional damping, in particular to an accurate testing system for frictional damping in high-frequency reciprocating motion of a valve core of a liquid rocket. Background technique [0002] In the past, the friction test of valve cores and other moving parts in my country generally used the method of hanging weights or quasi-static methods such as screw and springs to manually operate and visually read the meter. It mainly consists of the following main components: weights, springs, Composed of screw, scale and support. When in use, the screw is turned slowly to deform the spring until the inner force of the spring overcomes the static friction and causes relative motion of the kinematic pair. According to the mass of the weight or the deformation of the spring suspended before and after the movement, the dynamic friction force can be calculated. Its main disadvantages are: the friction force i...

AI Technical Summary

Problems solved by technology

[0003] The technical solution of the present invention is to overcome the deficiencies of the prior art and provide an accurate friction damping test system to solve the problems of low friction test efficiency, poor precision, and inability to perform high-frequency dynamic friction tests on valve cores and other moving parts in the past.

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