摘要
给出飞行器广泛使用的空气油液减震器作线性刚度阻尼特性的简单实用辨识方法。本法中采用幂级数展开建立减震器作线性模型，引入新变量后，将非线性辨识问题简化为含未知线性参数的线性辨识问题。设残差为与观测数据不相关的平稳过程，根据残差平方和最小的条件求得线性参数矢量无偏、有效和一致的估计子。模型的阶和最有效的独立变量分别按残差序列相关信息熵准则及最优干集回归法确定。实验表明，辨识结果相当满意，给出的方法实用，可供全面研究减震器动特性时使用。
A simple but realistic method for identifying nonlinear stiffness and damping of a widely used aircraft air-oil shock strut has been developed in this paper In the method a power series expansion is used to model the nonlinear dynamic properties of the strut,and after intro- ducing new variables,the nonlinear identification problem can be reduced to a linear one with unknown linear parameters.An unbiased, efficient and consistent estimator for the vector of the linear parameters is obtained-under conditions of minimizing the sum of squares residuals which are assumed to be stationary and uncorrelated with the observed data. The order and the most ef- fective independent variables in the model are determined by the criterion of residual series corre- lation information entropy and the procedure of the best subset regression respectively Experi- ment demonstrates that the results are quite satisfactory and the method developed is realistic,which can be used to study the dynamic properties of the strut in full detail.
出处
《航空学报》
EI
CAS
CSCD
北大核心
1994年第1期17-22,共6页
Acta Aeronautica et Astronautica Sinica
关键词
非线性方程
减振器
起落器
landing gear,shock absorbers,nonlinear systems,parameter identification
