模态耦合与能量馈入两种摩擦尖叫机理关系

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

摘要:

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.

关键词:摩擦尖叫; 发生机理; 模态耦合; 能量馈入

Abstract:

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 so far. A two degree of freedom vibration model was established to describe the dynamics of a kind of typical frictional system with friction pairs of a lumped parameter mass and a rigid mass. The conditions of mode coupling instability were derived, as well as the relationship between mode coupling and energy feed in, when conditions of mode coupling were met, not met, or met just critical. The analysis results show that energy feed in is dependent on mode coupling theory and cannot be regarded as generation mechanism of friction squeal.

Key words:friction induced squeal; generation mechanism; mode coupling; energy feed in