Non-deterministic Vibration Analysis of Degraded Polymer Structure Under Enviromental Changes

摘要

Perceivable interior noises such as buzz, squeak and rattle (BSR) have become important issues in the design of the automobile industry. Mostly due to small gaps or preload in the assembled polymer parts, they are also created by aging and degradation of engineering plastics, which render the loss of structural integrities. Therefore, to consider BSR from initial stage of the interior design, it is very important to obtain, analyze and understand the structural behaviors of the materials under environmental changes as well as time. Also, it is important to develop effective analyses tool for the BSR prediction. In this study, the engineering plastic material property changes were measured under temperature and humidity changes with different degrees. Degradation model was also established based on the data, in which uncertainties were taken into account due to the measurement errors and lack of data. For the BSR prediction, a finite element model was constructed and BSR prediction was compared by carrying out the vibration experiments for metal sample.