Measurement and analysis of squeal noise of vehicle wiper system
The squeal noise occurring from rubber and hard surface is an important issue, especially for vehicle wiper system. The noise is generated at relatively high frequency ranges, and its generation mechanism during the wiper operation is not straight forward to understand. In this study, experimental setup to generate the squeal noise in a consistent manner is designed using a rotating glass table. The wiper is located on the glass table in compressed status so that to simulate the wiper in the actual operating system. While the glass was rotating with constant velocity, the windshield washer fluid was sprayed on the glass. Under the normal constant velocity of the wiper operation, the condition (temperature, moisture contents, velocity) of continuous occurrence of the squeal noise was identified. The friction coefficient was measured, and its impact on the squeal noise generation was identified. The influence of various parameters such as the compression ratio, temperature, types of the wiper, angle of wiper installation, kinds of washer liquids was investigated using the suggested experimental setup. This provide the required information to design the vehicle wiper system that does not induce the squeal noise during the normal operation.