| Popis: |
Brake noise or squeal is a major problem experienced by brake system manufacturers, which leads to customer dissatisfaction and the questioning of quality. Research on the NVH performance of brake systems is performed to study and eliminate this problem using advanced testing tools, design modification, dynamometer testing etc. But still it continues to exist. One of the most important reasons is the complexity of the brake pad which leads to non-linear properties. Therefore, it is very important to understand the behavior of the brake pad, in terms of its dynamic characteristics (eigenfrequencies, damping and mode shapes), under varying conditions. Experimental modal analysis is currently used to analyze brake pads for studying these characteristics and is generally performed under free-free boundary conditions. A testing approach under pressure conditions is a step towards reality, as brake pads squeal only during a braking event. Furthermore, the dynamic characteristics of the brake pads are dependent on the pressure and the boundary conditions (location of piston and caliper). Therefore, studying the behavior of brake pads under pressure is a decisive process for solving the squeal issue. |
