Gravity Unloading Precision Analysis of Air Bearing Facility

doi:10.3901/JME.2019.05.001

Abstract

Abstract: A hierarchical and simultaneous gravity unloading facility is proposed. This facility is presented with air bearing to unload the gravity on the ground for testing the tracking and data relay satellite antenna pointing mechanism. The unloading method and the configuration are described and the running state is analyzed. The torque of two joints of antenna pointing mechanism is calculated by deriving the kinematics and dynamics models. The parameters which affect the gravity unloading precision are found:The force of the adjustable spring mechanism, the unbalance of the horizontal load, the deviation of concentricity, the viscous resistance of air bearing and level degree of granite platform. Those parameters are analyzed in detail with the influence on the gravity unloading precision. The theoretical unloading precision is derived by hierarchy analysis. The spring force and the unbalance of horizontal load are main parameters which reduce the precision, so those two parameters should be adjusted specially to improve the gravity unloading precision. The effectiveness of the gravity unloading method is proved with the test of the facility. The reduction of gravity unloading precision by those factors is got and the results match the analysis.

Key words: air bearing facility, air spindle, gravity unloading, gravity unloading precision, planar air bearing

CLC Number:

TH69

YANG Guoyong, WANG Hongguang, JIANG Yong, LING Lie, CHANG Yong, GAO Feng, YANG Fan. Gravity Unloading Precision Analysis of Air Bearing Facility[J]. Journal of Mechanical Engineering, 2019, 55(5): 1-10.

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