Application of Nearfield Acoustical Holography to Tire/Pavement Interation Noise Emissions

972047

05/20/1997

Event
SAE Noise and Vibration Conference and Exposition
Authors Abstract
Content
Tires are one of the dominate sources of exterior vehicle noise. In this study, Nearfield Acoustical Holography (NAH) is used to investigate the sources of noise generated by tire interaction with an outdoor road surface. One tire on a two wheel trailer is examined while towed by a vehicle at 56 km/hr (35 mph) along a smooth, consistent road surface. The complex pressure is measured at discrete points along a plane parallel to the side of the tire by scanning with an array of five microphones. Because of the incoherence of noise generated at the leading and trailing edges of the contact patch, and radiation from the side wall, three reference microphones are used. NAH is used to reconstruct the pressure on planes towards and away from the tire, thereby obtaining a three dimensional image of the acoustic pressure, particle velocity, and intensity for noise generated at the contact patch leading edge and trailing edge, and by the tire sidewall vibrations. The findings should identify sources on the tire, as well as provide a better understanding of tirelpavement interaction noise generating mechanisms.
Meta TagsDetails
DOI
https://doi.org/10.4271/972047
Pages
10
Citation
Ruhala, R., and Burroughs, C., "Application of Nearfield Acoustical Holography to Tire/Pavement Interation Noise Emissions," SAE Technical Paper 972047, 1997, https://doi.org/10.4271/972047.
Additional Details
Publisher
Published
May 20, 1997
Product Code
972047
Content Type
Technical Paper
Language
English