大型空间结构的自适应控制

本文将Bar-Kana等人的模型参考自适应控制法(MRAC)用于柔性结构的自适应控制中,原方法要求系统的输入维数等于输出维数。对于柔性的大型空间结构(LSS),观测量的数目往往大于输入量的数目。本文采用组合LSS各观测点的信号,形成综合输出矢量Y_P,以满足自适应控制系统中,用较少的控制输入达到控制LSS结构中较多观测点的要求。为了克服跟踪误差,本文建议用最优返馈增益阵作为输出阵C_P,并采用LQR理论以求C_P。 本文将大型空间结构的实例简化成离散模型,进行模拟计算,计算结果说明系统有较好的跟踪特性,当LSS的柔度变化较大时,系统具有跟踪的鲁棒性。

ADAPTIVE CONTROL OF LARGE SPACE STRUCTURES

This paper deals with the application of a model reference adaptive-control theory to the attitude control of large space structures that don't satisfy the conditions of sensor/actuator collocation.The signals from several different positions on the flexible appendages are combined into outputs so that the number of outputs is the same as the number of inputs-As an example, we will consider a spacecraft that has flexible solar paddles and a momentum wheel within the rigid central body.Computer simulation results are presented for a situation where the flexural rigidity of the flexible appendages are assumed to vary widely from nominal values.