结构改进降低制动噪声:数值和试验的性能鉴定(二)

Structural Modifications for Squeal Noise Reduction: Numerical And Experimental Validation

噪声是摩擦力引起振动造成音响的一个实例,最近十年多来已经开展了许多研究,这些研究确定集中于简单的制动系统和鉴别‘锁止’的不稳定是造成制动噪声的原因。本文介绍了过去研究的简短文献目录和最近的研究成果。由于锁止对系统动力学的敏感性,制动器设计不能避免模态上的耦合,高的模态不透明度和不确定性与自然频率有关。本文推荐了一种为避免振动滋生的改进方法,它是用集成结构修正转子。

Squeal is an example of noise caused by vibrations induced by friction forces. Several works have been developed over the last decades. Certain of these works have focused on simplified brake systems and identified ＇lock-in＇ instability as being the cause of squeal. A short bibliography of previous works and the most recent results are presented. Brake design is not capable of avoiding modal coupling due to ＇lock-in＇ sensitivity to system dynamics, high modal density and uncertainties regarding the natural frequencies. This paper suggests an innovative approach for avoiding the growth of vibrations, by making lumped structural modifications to the rotor.