Abstract
Although most highway noise is due to radiation from rolling tires, the dominant sources of tire/pavement interaction noise remain largely unknown. In this study, near-field acoustical holography (NAH) is used to visualize the acoustic field of a rolling tire on outdoor pavement surfaces. Since NAH measurements are conducted in the near field, areas of maximum radiation from the tire may be localized with a much finer resolution than with conventional measurements. Planar NAH is used to scan planes along the side, front, and rear planes of the tire. A scanning mechanism will be attached to an automobile trailer for measurements of tire noise under realistic conditions and procedure as developed in earlier results [R. J. Ruhala and C. B. Burroughs, SAE 972047 (1997)]. Several types of tires are evaluated, including blank tire, tire with even spaced transverse grooves, tire with only circumferential grooves, and a production passenger car tire. The tires are tested on both smooth and rough pavements, and at several speeds. The results will provide further insight into the sources and mechanisms of tire/pavement interaction noise. [Work supported by Goodyear, DOT, and GM.]
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