摘要
本文基于对非线性系统的可分离性假设，将非线性弹性恢复力和阻尼力分别分解为物理坐标下各点间相对位移和相对速度的幂级数函数，导出了一般多自由度非线性系统在恒幅激励下的广义频率响应函数与输入输出之间的迭代关系式，提出了非线性系统中基本线性部分的概念。
In this paper, an efficient method of identifying nonlinear physical parameters of multidegree of freedom system is suggested. An iterative equation between input/output measurement data and the Generalized Frequency Response Functions is derived. A new approach for physical parameter identification of nonlinear multi degree of freedom systems is developed. All the polynomial coefficients of the nonlinear stiffness and damping forces can be obtained by this algorithm. The technique is also suitable for the large scale system with local nonlinearities. The application of the method is demonstrated by numerical examples and rubber absorber testing.
出处
《应用力学学报》
CAS
CSCD
北大核心
1996年第3期7-11,共5页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金
国家教委博士点基金
关键词
非线性
参数辩识
频响函数
力学
nonlinear, parameter identification, frequency response functions.
