This paper describes acoustic holography with 2-dimensional arrayed microphones being applicable to identify the source of tire road noise during vehicle running. Tire noise is generated by interaction between road surface and tires tread during vehicle running. The validation of the noise sources and the characteristics of tire road noise emitted in running on practical roads is important for the development of low noise road surface and tire. Former acoustic holography is a method to measure hologram of the noise source moving horizontally as tire noise during vehicle running with liner vertically arrayed microphones fixed on the road. This method is applicable limited to identify a periodic noise source with the frequency in advance informed. This paper proposes new acoustic holography method with 2-dimensional arrayed microphones being applicable to identify a periodic and a band noise source without the prior information for the frequency of noise source. This new method was verified by the running vehicle experiments on test site with loudspeaker and the model tires of single-center groove and 3 rib.
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