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参考微动量轮的实测数据,讨论并建立描述转速随机变化的马尔可夫模型.在该模型基础上,提出并分析用于皮卫星的偏置动量轮备份、切换策略.该策略定义了4个正常模式和3个异常模式:在普通情况下,系统在正常模式下定时切换飞轮;当故障发生时,系统切入异常模式,隔离故障飞轮.与常规的冷备份方法相比,该策略为飞轮性能、功能的故障检测提供了更方便的途径,同时在更长时间段内,能够保持星体连续姿态稳定.数学仿真表明,应用本文策略,正常情况切换时,造成的姿态扰动最大不超过20°;对于突发故障,切换带来的姿态扰动恢复时间约为30min.
With reference to the measured data of the micro-momentum wheel, the Markov model which describes the stochastic change of rotation speed is discussed and established. Based on this model, the biased momentum wheel backup and switching strategy for skin satellite is proposed and analyzed. The strategy defines 4 Normal mode and 3 abnormal modes: Under normal conditions, the system switches the flywheel periodically in normal mode, and when the fault occurs, the system switches to abnormal mode and isolates the failed flywheel. Compared with the conventional cold backup method, the strategy is that the flywheel Performance and function of the fault detection provide a more convenient way, at the same time in a longer period of time, to maintain a continuous star attitude stability.Mathematics simulation shows that the application of this paper strategy, the normal situation caused by the switch, the maximum disturbance does not exceed 20 ° ; For sudden failure, the switching delay caused by gesture disturbance recovery time is about 30min.