模态耦合与能量馈入两种摩擦尖叫机理关系

模态耦合和能量馈入是当前重要的两个摩擦尖叫发生机理理论,但是对于两种理论之间的关系尚未有针对性的开展研究.针对一种典型的集总参数柔体刚体组成的摩擦振动副,建立2自由度摩擦振动动力学模型;推导了系统产生不稳定模态耦合的条件,并分满足模态耦合条件、满足临界模态耦合条件和不满足模态耦合条件3种情况分析了模态耦合理论与能量馈入理论之间的关系.结果表明:能量馈入依赖于模态耦合理论,而不是一种摩擦噪声机理理论.

Relationship Between Two Friction induced Squeal Mechanisms of Mode Coupling and Energy Feed in Theories

Mode coupling theory and energy feed-in theory are both regarded as important generation mechanisms of friction induced squeal, but there have been no investigations into relationship between them. In this paper, a two-degree-of-freedom nonlinear vibration model was established, to describe dynamics of a kind of typical frictional system with friction pairs of a lumped parameter mass and a rigid mass. The conditions of instability of mode coupling were derived, as well as the relationship between mode coupling and energy feed-in, when conditions of mode coupling are met, not met, and met just critical. The analysis results show that, energy feed-in is only some motion patterns of mode coupling under certain conditions, it cannot be regard as generation mechanism of friction squeal.