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Nonlinear Parameters Identification of the Space Docking Mechanism
Author(s): Lu Qiuhai, Ge Dongyun, Min Jianqin
Pages: 681-
683
Year: 2004
Issue:
z2
Journal: JOURNAL OF VIBRATION ENGINEERING
Keyword: 空间对接机构; 非线性参数; 辨识;
Abstract: 用系统的输入、输出数据识别空间对接机构的非线性参数:惯量矩阵、阻尼矩阵和刚度系数矩阵.首先采用前向差分格式和信号采样的零阶保持器假设,用物理参数描述的非线性系统运动的二阶非线性常微分方程组离散为差分方程组,即与之对应的NARMAX参数模型.采用前向正交算法估计NARMAX参数后,经代数运算即可得到对接机构的物理参数.用上述方法建立的NARMAX模型,不仅使参数物理意义明确,而且可避免高阶NARMAX参数模型极其大量的非线性项.6自由度Stewart平台型对接机构仿真算例验证了方法的可行性.
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