Browse Publications Technical Papers 2019-26-0216
2019-01-19

A Test Methodology for Vehicle Wind Noise Reduction and Acoustic Quality Improvement 2019-26-0216

Aeroacoustics of vehicles is becoming an important design criteria as it directly affects passenger’s comfort. The wind noise at highway speeds (>80KMPH) is a critical quality concern under normal and crosswind conditions and dominant factor in assessing acoustic comfort of the vehicle. Wind noise is caused by the vortex air flow around a vehicle body and air leakage through the sealing gaps of attached parts. This majorly contributes to high frequency noise (>250Hz). Accurate identification and control of noise sources and leakage paths result in improved acoustic comfort of the vehicle. In this paper, aero-acoustic quality characteristics of validation prototype vehicle are studied. The major wind noise sources and leakage paths in the vehicle are identified through in-house blower set up in the semi anechoic room. The overall wind noise level and articulation index of vehicle at various speeds are determined through on- road measurements. The improvement in the vehicle articulation index (AI) by 10% and reduction in noise level by 5 dB (A) are achieved through design modification of seals, door structure and trim parts.

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