【作者】 南旭东；

【导师】 刘佐民；

【作者基本信息】 武汉理工大学 ， 机械电子工程， 2008， 硕士

【摘要】 论文基于摩擦副匹配性探讨了盘式制动器粘-滑振动特性;本研究为制动摩擦副的材料选择和寿命设计提供依据。文中采用虚拟样机技术,应用有限元软件ANSYS和多体动力学软件ADAMS,建立了盘式制动器总成的多柔体模型。利用该模型进行了制动过程的仿真,研究了制动过程中粘-滑效应对其动力学的影响,研究表明:制动效能随动摩擦系数增大而增加;但其增大幅值应控制在一定范围,当摩擦系数太高时,将会增加粘-滑振动概率。为了研究摩擦配对副对盘式制动器粘-滑振动的影响,将摩擦学与动力学相结合,建立了盘式制动器制动过程的粘—滑模型。基于匹配性试验得出的摩擦力.速度负斜率特性曲线,仿真分析了摩擦副配对盘式制动器粘-滑振动的影响;结果表明:硬度高的配对副,其摩擦系数也高;但导致了在低速制动时的粘-滑振动增大现象。为了验证理论模型和仿真分析的正确性,论文基于台架试验,考察了两组不同摩擦配对副制动时引起的制动钳体的振动。试验结果表明:配对副对制动器振动的影响较明显,摩擦片硬度越高,制动钳的振动强度越大;试验结果验证了文中理论模型和仿真分析的正确性。更多还原

【Abstract】 For choosing frictional material and improving design of the automotive brake, the stick-slip vibration characteristic of brake has been investigated Based on the matching pair of the brake.A flexible multi-body model of the brake assembly is established by using Virtual Prototype Technology and Automatic Dynamic Analysis of Mechanical System (ADAMS) as well Finite Element Analysis Software (ANSYS), and used to simulate the braking process and analyze the influence of the stick-slip on the dynamics during the process. The research shows that the braking efficiency increases with raise of dynamic friction coefficient, but the raising amplitude should be controlled within a certain range. The probability to result in stick-slip vibration increases when the friction coefficient reaches up a given value.For exploring the influence of friction pairs on stick-slip vibration, a new stick-slip model to simulate the braking process has been developed based on the tribology with dynamics. By using the model and a serial of negative slope characteristic curves of friction-speed by experiments, the influence of friction pair on the stick - slip vibration was investigated. The results indicate that the higher the hardness of the matching material is, the higher the friction coefficient is, and that the stick-slip vibration easily occurs at low-speed braking conditions.For confirming the theoretical model and analyzing results above, a bench tester and two groups matching pairs were used to study the stick-slip vibration phenomenon. The results indicate that the vibration signals change with friction pair in the braking process, and the higher the hardness of the matching material is, the greater the intensity of vibration signal of the brake is. This shown that the theoretical model in the thesis is correct and can be used in engineering to analyzing the vibration phenomenon of the brake.更多还原