鼓式制动器摩擦尖叫的复模态模型与影响因素研究

针对某型号鼓式制动器，应用ABAQUS软件建立了摩擦尖叫有限元模型，通过零部件自由模态试验和制动尖叫台架试验验证了模型的正确性。在此基础上，进行了制动蹄摩擦衬片弹性模量、制动压力和摩擦系数对摩擦尖叫倾向性的影响分析；引入制动鼓与制动蹄间的接触压力分布特性，结合复模态理论，探索了前述因素对摩擦尖叫的影响的内在机制。

Complex eigenvalue analysis model of automotive drum brake for frictional squeal and the parametric sensitivity study

A large number of structural, material, operational and environmental factors would have great influence on automotive brake squeal induced by friction, and the intrinsic influencing mechanism is a significant and challenging issue needs to be solved. Selecting a certain type of drum brake as the research object, a drum brake finite element model for frictional squeal is established using ABAQUS, a free-free modal test of individual brake components and the brake squeal bench test are performed to verify the model, and on the basis of which, the impact of Young’s modulus of shoes’ linings, brake pressure and friction coefficient on the squeal propensity is analyzed By introducing the contact pressure distribution properties between the drum and shoes, the intrinsic influencing mechanism of the factors above on squeal propensity is studied based on the complex eigenvalue theory. Results show that: (1) the squeal propensity of the drum brake decreases with the increase of Young’s Modulus of linings, while increases with the increase of friction coefficient and brake pressure; (2) the nonuniformity of contact pressure distribution is closely related to the squeal propensity and could make an unified explanation on the intrinsic influencing mechanism of the factors above; the squeal propensity decreases as the nonuniformity of contact pressure distribution increases, and the system tends to be more stable.