NUMERICAL AND EXPERIMENTAL INVESTIGATION OF SQUEAL NOISE GENERATED IN A DISC BRAKE SYSTEM AND REDUCTION OF IT

Disc brake squeal is considered as one of the major problem in NVH sector in automotive industries. The instability generated in disc brake system is mainly due to coupling of free modes of the disc rotor and brake pad. To evaluate instability, complex modal analysis is applied numerically in Ansys. A brief parametric study is done to analyze the effect of operational and material parameters in generation of instability. To validate the numerical analysis experimental modal analysis is performed. Ten different modifications were studied numerically so as to reduce the instability. A suitable modification was chosen based on numerical simulation and was modified for experimental validation. Squeal tests performed in experimental analysis also evaluate the reduction of squeal noise between unmodified disc brake system and modified disc brake system.