2003-01-1625_BrakeSquealVirtualDesign_Chung.pdfVIP

2003-01-1625 Virtual Design of Brake Squeal Chih-Hung Jerry Chung William Steed Jianrong Dong MTS SYSTEMS Bong Soo Kim Geun Soo Ryu Hyundai Motor Co. Copyright ? 2003 SAE International INTRODUCTION Disk Brake Squeal noise is a problem that continues to confront automobile manufacturers. Customer complaints result in significant warranty costs yearly. Furthermore, customer dissatisfaction can cause a loss of future business. Physically, squeal noise occurs when the friction coupling between the rotor and pad creates a dynamic instability. This leads to vibration of the structure, which radiates a high frequency noise in the 1- 15 kHz range. Many analytical approaches have been proposed in the literature to evaluate the Brake Squeal Dynamics and the most popular approach is the Complex Eigenvalue approach[3]-[6]. Root Locus analysis is a further application of the Complex Eigenvalue approach, which can trace the unstable modes back to meaningful structure mode pairs. While the Root Locus method provides a way to identify potential critical modes, it suffers from several drawbacks, such as long solution time and lack of resolution to provide the detail mode interaction among complex roots. Chung, et. al. [1] presented a new analysis approach by transferring the brake system equation of motion from transient domain to modal domain. The modal domain transformation significantly reduces the complexity of the Complex Eigenvalue analysis and provides mechanism of mode coupling phenomenon. The presented approach has been successfully applied to solve Automotive Brake Squeal problem [1] and Motorcycle brake squeal problem [2]. The goal of this paper is to apply the Modal Domain analysis approach to minimize design iterations using FE models and provides a new method to calculate Complex Eigenvalues to reduce solution time. VIRTUAL DESIGN STUDY CONCEPT The title of the paper is called ‘Virtual Design of Brake Squeal’. In