An Experimental Analysis Method for the Motion Trajectory of the Center of Mass of a Joint with a Gap under Different Gravity Orientation Conditions

Abstract

The invention discloses an experimental analysis method of the clearance joint centroid movement trajectory under different gravitational orientation conditions. The method is based on the microgravity environment simulation device of a gravity-oriented rotating table, the device comprises a turntable bracket, a motor, a decelerator, a load bearing platform and a two-link mechanism with a clearance joint fixed on the load bearing platform, and the turntable can achieve 180-degree continuous rotation and self-locking to ensure that a test mechanism rotation joint can be under the different gravity potentials. The measurement of the rotation joint kinematic pair gap in the experimental method is carried out a strain gage gap measurement method based on the strain measurement technology, so that the obtaining of the centroid movement trajectory of a bearing to be tested in the movement process of the two-link mechanism with a clearance joint under the different gravitational orientation conditions can be realized. The gravity-oriented turntable can perform the study on the joint flexibility, arm flexibility and vibration spectrum of a flexible space mechanism under the different gravitational orientation conditions.

Description

technical field

[0001] The invention relates to an experimental analysis method for the motion track of the center of mass of a hinge with a gap under the condition of different gravity orientations. Background technique

[0002] With the development of aerospace technology, the use of various space agencies will become more and more common. During the design, assembly and use of any space mechanism, due to factors such as the necessary dynamic fit of the mechanism, errors in the manufacturing process, and wear during use, there must be a gap between the hinges of the space mechanism. Spatial mechanisms with gaps between hinges inevitably encounter the problem of differences in motion behavior under gravity and its release conditions.

[0003] Aiming at the microgravity environment of space agencies, a number of ground simulation test devices for space agencies have been developed internationally. The existing ground simulation test methods for microgravity environments mai...

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