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Vehicle Moonroof Design for Wind Noise

[+] Author Affiliations
Yuksel Gur, Apoorva Agarwal, James Michnya

Ford Motor Company

Paper No. IMECE2004-61156, pp. 873-881; 9 pages
doi:10.1115/IMECE2004-61156
From:
  • ASME 2004 International Mechanical Engineering Congress and Exposition
  • Design Engineering
  • Anaheim, California, USA, November 13 – 19, 2004
  • Conference Sponsors: Design Engineering Division
  • ISBN: 0-7918-4705-5 | eISBN: 0-7918-4178-2, 0-7918-4179-0, 0-7918-4180-4
  • Copyright © 2004 by ASME

abstract

A study was undertaken to address excessive moonroof wind noise in some vehicles. Mathematical models were developed to understand noise generation mechanisms associated with the moonroof system, and these models were used to investigate ways to reduce vehicle interior noise levels. Extensive acoustic & vibration testing was performed on vehicles in the wind tunnel and on the test track. The wind tunnel and test track data were analyzed in a sound quality laboratory for root cause analysis. CFD (computational fluid dynamics) simulations were performed to understand flow behavior over the moonroof in both modes of operations (vented and fully retracted). An experimental moonroof deflector optimization study was developed and conducted to identify the necessary design changes to minimize the vehicle interior noise level for fully retracted condition. Variability studies were also performed on the moonroof flushness, deflector height, and retraction distance. Through extensive analyses, using both experimental and analytical techniques, the main causes of wind noise associated with moonroof system were identified. Vehicle moonroof design recommendations were generated for significant wind noise reductions.

Copyright © 2004 by ASME

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