Journal of System Simulation ›› 2018, Vol. 30 ›› Issue (10): 3746-3752.doi: 10.16182/j.issn1004731x.joss.201810019

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Lateral Force Measurement and Processing of Planar Air-Bearing System for Microgravity Simulation

Li Xinfeng1, Xiang Dong2, Tian Xinghua1, Wei Wei2   

  1. 1. Key Laboratory of Space Utilization, Technology and Engineering Center for Space Utilization, Chinese Academy of Sciences, Beijing 100094, China;
    2. Pneumatics Center, Harbin Institute of Technology, Harbin 150001, China
  • Received:2016-04-08 Revised:2016-07-23 Online:2018-10-10 Published:2019-01-04

Abstract: An approach of direct force measurement is proposed to estimate the lateral force of a planar air cushion system. Lateral force gauges are arranged around the planar air bearing platform with preloading force exerted before afloat. Lateral force and its torque with respect to the geometric center can be obtained from the gauge variations while the afloat system reaches balance. Friction coefficient in every touch-spot can be evaluated with least square state estimation, which changes to a generic minimum problem with constraints since its solution matrix has a rank deficit. The analysis based on the test of a specified platform reveals there is desirable difference between estimation with friction and one without, if the preloading force is less than the critical value across which the direction changes.

Key words: planar air-bearing system, lateral force, torque of lateral force, friction coefficient, deficit rank, singular value decomposition

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