Squeal Propensity Analysis And Optimization Of Automobile Disc Drake System

With the increasing vehicle population in our country, people not only pay attention to the price and safety of automobiles, but also pay more and more attention to the automobile comfort such as vibration and noise when buying automobiles. With the advancement of science and technology, the interior vibration and noise levels have been lowered obviously. However the vibration and noise of certain subsystems and components such as brake systems become much noticeable. So, study of the vibration and noise of brake systems becomes very important, which has high practical value for brake system design.In this article, the finite element method combined with mode analysis was introduced to study the brake squeal propensity and the optimization of brake system structure design based on brake squeal propensity. A new finite element model of brake system based on surface contact was established. The surface contact method can remove the shortages of the original spring model. Nonlinear static analysis considering brake force and rotor rotational velocity was performed first to identify the pressure volume which is a measurement of the stiffness of brake systems. Complex eigenvalue analysis was then used to predict the instable modes and their brake squeal propensity. Parameter study was performed on the system design parameters such as friction-induced damping, friction coefficient, brake force and rotor rotational velocity. Finally, optimization of key parts of the brake system was conducted to reduce the brake squeal propensity. It was shown that the thickness and fillet diameter of the friction lining have remarkable influence on the brake squeal propensity: the brake squeal propensity can be reduced greatly by structural optimization of the brake system by changing the thickness and fillet diameter of the lining. The method will prove to be useful for future disk brake noise analysis and structural optimization design.