基础激励下含间隙折叠舵面非线性系统辨识

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Abstract Freeplay nonlinearity is ubiquitous in folding rudders of flight vehicles, which is difficult to be accurately described.It is necessary to obtain the real nonlinear characteristics of freeplays by using system identification methods.The identified model of the nonlinear system with freeplays under base excitation was first built using direct parameter estimation.Nonlinear restoring force was expressed by polynomials of relative velocity and displacement.A significance factor was defined to determine whether a term is an important part of the identified model, and the coefficients of the polynomials were solved by the least squares method.Finally, the completed system model can be obtained based on the relationship between different degrees of freedom, and the identification accuracy can be validated via the mean-square error between the estimated and measured responses.Identification results of a three degree of freedom numerical example demonstrate that the restoring force of a nonlinear system with freeplays can be accurately approximated by adding cubic stiffness.Furthermore, the dynamic characteristics of two measuring points on the folding rudder can be well described by the identified model, which is of importance to discretization modeling and dynamic analysis of folding rudders with freeplays.

Key words： folding rudders base excitation freeplay nonlinearity system identification

Received: 03 August 2018 Published: 15 February 2020

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	Articles by authors
	WANG Bo1
	2
	MA Zhisai1
	2
	DING Qian1
	2
	ZHANG Xin3
	YANG Ning3

Cite this article:

WANG Bo1,2,MA Zhisai1, et al. System identification of folding rudders with freeplay nonlinearity under base excitation[J]. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(4): 122-128.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2020/V39/I4/122

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