可重复使用运载器再入段喷气选择逻辑重构研究

针对反作用控制系统(RCS)推力器开机失效后的喷气选择逻辑(JSL)重构问题进行了研究,提出了2种实现JSL重构的方法:①基于组合逻辑检索的方法;②基于冲量矩控制的线性规划方法。RCS是可重复使用运载器(RLV)再入过程中控制姿态的主要执行机构,所以RCS能否正常工作关系到RLV能否成功再入返回。为了提高RCS的可靠性,必须考虑RCS推力器开机失效后的喷气选择逻辑(JSL)重构问题。基于美国X-34技术验证机后部RCS配置方案的仿真试验证明了在出现推力器开机失效时,应用这两种JSL重构方法后,虽然控制效果有所降低,偏航、滚转角与角速度出现了振荡,但仍能满足系统性能要求。

Two Different Methods of JSL Reconfiguration for Reusable Launch Vehicle's Reentry Phase

We present two different methods of reaction control system(RCS) jet selection logic(JSL) reconfiguration:(1) assembled logic searching,(2) linear programming based on impulse moment control.In the full paper,we explain in some detail our two methods of JSL reconfiguration;in this abstract,we just add some pertinent remarks to listing the two topics of explanation.The first topic is: the method of JSL reconfiguration based on assembled logic searching.In the first topic,after explaining the principles of JSL reconfiguration,we give three specific steps of JSL reconfiguration.The second topic is: the linear programming method of JSL reconfiguration based on impulse moment control.In the second topic,we first explain the principles of linear programming method and then discuss its pros and cons as compared with the JSL reconfiguration method based on assembled logic searching.Finally,using the back RCS schematic of American X-34 technology demonstrator,we performed simulations,whose results are given in Figs.2 through 9 in the full paper.These results show preliminarily that the two different methods proposed by us are both effective;when RCS jet fails to fire,although the control performance deteriorates quite considerably,such deterioration is still allowable.