一种改进的矩闭合法及其在振动工程中的应用

Improved moment closure approach and application in vibration engineering

提出一种改进的求解多自由度非线性随机振动问题的高斯闭合法,解决了一般高斯闭合法自谱有时会出现负值的矛盾,并能得到等效线性化法所得不到的某些频域信息.用此方法分析了装有非线性减振器风力灭火机车辆系统的振动.

This article provides an improved Gaussian closure approach solving for the nonlinear random vibration of multi—DOF system.This approach avoids the mistakes and the negative value which is appeared in the auto—power spectrum for the general Gaussian closure approach,and can obtain some values of frequency which can not be obtained by the equivalent linearization method.By the approach,the paper analyzes the vibration of a nonlinear absorber on the vehicle fitted with wind—driven extinguisher.