鼓式制动器非线性模型的不稳定性分析与优化
Instability Analysis and Optimization of a Drum Brake Nonlinear Model

基于鼓式制动器接触单元的四自由度振动模型，分析了其不稳定性是耦合摩擦力所致，主要因素为摩擦系数、弹性模量和接触面积.建立了制动器的摩擦接触非线性有限元模型，并用试验验证了模型的有效性.有限元模型单因素分析表明，减小摩擦系数或降低摩擦衬片弹性模量都能明显降低不稳定性系数，同样，制动器不完全接触亦可减小其不稳定性系数.采用响应面法对影响因素进行了优化，不稳定性系数降低了55.6%，优化后模型不稳定性有明显改善.
Based on the four degrees of freedom vibration model of the drum brake contact unit, its instability is found to be caused by coupling friction, and the main factors are friction coefficient, elastic modulus and contact area. A friction contact nonlinear finite element model of the brake is established, and the validity of the model is verified by an experiment. A single-factor analysis of the finite element model shows that reducing the friction coefficient or reducing the elastic modulus of the friction lining can significantly reduce the instability coefficient and, similarly, the incomplete contact of the brake can also reduce its instability coefficient. Optimization of the influencing factors with the response surface method reduces the instability coefficient by 55.6%, thus significantly improving the instability of the model