Reduction of roof rack noise and vibration

The noise and vibration design of automotive add-on component roof rack was investigated. Different modification options were evaluated which include mounting location alteration, mounting damping change and material revision. Results from experimental modal analysis and sound pressure spectrum measurement in a wind tunnel indicate the direction of design modification for reduction of the roof rack noise and vibration. The modal analysis and physical tests of wind tunnel proved to be good tools for evaluating and ranking roof rack noise and vibration performance.