A BSR Analytical Evaluation Method Considering the Sound Quality Perception

The BSR(Buzz, Squeak and Rattle) noise is the perceived noise of annoyance and caused by impact or friction in the gap between parts of a system. It is one of the major factors that influence the perception of quality. The BSR noise emerges along the gap, joint and contact surface of a system under external forces such as the road loads and the engine vibration input. Major causes of BSR phenomena are the degradation of materials and the resonance characteristics of a system. BSR issues can be generally found in the field, after the system has seen several cycles of use. BSR issues are challenging to find in the virtual development stage. Our aim is to develop BSR evaluation process driven by CAE, in order to identify the occurrence of BSR at the early stage of the design. Whereas subjective evaluations have been typically required in order to assess the perception of quality, a virtual evaluation method is proposed in this study. An analytical methodology is presented here to detect the location and threshold level of BSR, through a finite element analysis for a gap model and a pre-loaded model. Implicit and explicit FEA and sound generation will be addressed in this study. The effect of environmental and material property changes is considered in the time domain transient analysis used to predict sound.