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I n ground testing of a spacecraft system, a simulator system which emulates a micro-gravity environment is necessary. It is demanded that the simulator system has wide response frequency bandwidth when it deals with motions having contacts and collisions. The authors have been developing a hybrid micro-gravity simulator which has wide response bandwidth. Its motion table is a high-speed parallel robot driven by powerful direct drive motors. In preliminary experiments, this robot has achieved accelerations up to 40 [GI. In this paper, we report an outline of the simulator and discuss the obtained experimental results.

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