基于小波变换的摩擦噪声模态耦合机理研究  

Investigation of the Modal Coupling Mechanism of Squeal Generation Based on Wavelet Transformation

作　　者：陈光雄[1] 周仲荣[1] 

机构地区：[1]西南交通大学摩擦学研究所,四川成都610031

出　　处：《摩擦学学报》2003年第6期524-528,共5页Tribology

基　　金：国家自然科学基金资助项目(50075072).

摘　　要：观察分析了往复滑动摩擦条件下摩擦噪声的形成和发展过程,探讨了摩擦噪声的产生机理.结果表明:在往复滑动摩擦条件下产生了2种具有明显不同特征的摩擦噪声:第一种摩擦噪声在摩擦系数较小的摩擦初期即存在,对应的法向主振动与切向主振动几乎同时发生;第二种摩擦噪声在摩擦系数比较大时才出现,对应的法向主振动发生于切向主振动之前.利用小波变换技术进行分析后发现,第一种摩擦噪声对应的动态摩擦力不是源于法向力变化,而第二种摩擦噪声对应的动态摩擦力则明显源于法向力变化,前者同模态耦合机理不符,而后者则支持模态耦合机理.The generation and progression of frictioninduced noise were investigated by conducting friction and wear test on a reciprocal test rig. The generation mechanisms of the frictioninduced noise were explored. It was found that there existed two kinds of squeals with different features at different reciprocal sliding cycles. In the early stage of the reciprocal sliding, the friction coefficient was relatively smaller and the tangential and normal vibrations associated with the squeal occurred simultaneously. At an extended reciprocal sliding cycle, on squeal was observed when the friction coefficient rose to a larger value. In this case, the normal vibration associated with the squeal occurred prior to the generation of the tangential vibration with the same frequency as the normal one. By making use of the discrete wavelet transformation, it was found that the fluctuating friction force associated with the former squeal was not correlated with the normal vibration, which was in disagreement with the modal coupling mechanism. The varying friction force associated with the latter squeal was well correlated with the normal vibration, which agreed well with the modal coupling mechanism.

关 键 词：尖叫噪声 摩擦振动 模态耦合 小波变换 

分 类 号：TH117.3[机械工程—机械设计及理论]