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由于高超声速飞行器具有飞行包络大,实验数据较少,难以精确建模等特点,所以其具有不可忽视的不确定性。针对高超声速飞行器参数不确定控制问题,提出了一种弹性自适应控制方法,首先给出了高超声速纵向动力学模型,并对其进行精确线性化处理;其次分析了参数不确定对线性化处理后的模型的影响;然后在此基础之上分两步进行了弹性自适应控制律的设计,第一步基于自适应Backstepping控制方法设计了标称控制器,第二步基于对所构造的李雅普诺夫函数的分析,得到了最终控制器并证明了系统稳定性;最后进行了仿真实验,实现了不确定情况下对速度和高度指令的准确快速跟踪,表明了该控制方法对参数不确定具有良好的适应能力。
Hypersonic vehicles have many characteristics such as large flight envelope, small experimental data and difficult to accurately model, so they have some important uncertainties. Aiming at the problem of uncertain control of hypersonic vehicle parameters, a flexible adaptive control method is proposed. Firstly, the hypersonic longitudinal dynamics model is given and its linearization is performed accurately. Secondly, the uncertainty of linearization Then based on this, the design of flexible adaptive control law is carried out in two steps. The first step is to design a nominal controller based on the adaptive backstepping control method. The second step is based on the construction of the Lyapun Nouff function analysis, the final controller is obtained and the system stability is proved. Finally, a simulation experiment is carried out to realize the accurate and fast tracking of the velocity and altitude commands under uncertain conditions. It is shown that the control method has the advantages over the uncertain parameters Good adaptability.