随机激励下铝蜂窝夹层板非线性特性研究

基金项目:

国家863计划基金资助项目（2007AA702202）

Nonlinear dynamic analysis of aluminum honeycomb sandwich board based on random excitation

摘要: 为研究铝蜂窝夹层板的非线性动力学特性，对铝蜂窝夹层板做不同激振量级下的随机振动试验，并作出非线性幅频图。系统的非线性频响函数的共振放大倍数随着激振量级的增加而减小，其特征与应用等效线性化及FPK法计算的带有非线性阻尼的系统理论得出的结果相似，拟合结果也表明试件的等效阻尼系数随外激励变化而变化，故得出文章中的试件带有非线性阻尼特性。铝蜂窝夹层板具有非线性阻尼特性这一结果可对航天器建模提供理论参考依据。
- 随机激励；铝蜂窝板；非线性特性；等效线性化法；非线性阻尼
Abstract: The nonlinear dynamic characteristics of aluminum honeycomb sandwich board, as a widely used compound material in spacecraft, are studied in this paper. With random vibration tests in different test levels, nonlinear frequency response functions (FRF) are obtained; and it is shown that as the excitation level increases, the FRF decreases in magnitude, and the damping ratio increases, which is consistent with the model with nonlinear damping, with FPK transform and equivalent principle method being combined. That reveals the nonlinear damping characteristics in aluminum honeycomb sandwich board. This study provides a theoretical guidance in choosing a model for a nonlinear dynamic system.
- random excitation