Investigation of Mounted Disc Brake In-plane and Out-of-plane Modes in Brake Squeal Study

摘要

As an effort to solve high frequency brake squeals, increasing attention has been focused on the relationship of the in-plane (IP) and the out-of-plane (OP) modes of a disc brake and valuable conclusions have been achieved. As a continuous work of Reference [1], the IP-OP mode relationship under mounted conditions was further investigated experimentally in this paper. Disc mode indication functions (DMIFs) were useful in quick identification of these modes. Correlation study between dynamometer noise results of a noisy brake system and these measured IP and OP modes was made. It is found that under lightly clamped conditions, the response levels of all direct OP and IP vibrations are in a transit stage. Under highly clamped conditions and as the pressure keeps increasing, the IP-OP vibrations become more coupled; the OPD modal frequencies rise while the IPC modal frequencies remain little changed; and the IPC-OPD frequency separation increases. It is also found that the IPC-OPD frequency lineup is not correlated with vehicle squeal.