The R51 test is a method of evaluating the vehicle pass by noise when the vehicle is accelerating. However, according to the latest R51.03, the contribution of tire noise is reported to increase by 40 ~ 50%. Therefore interest in tire noise during accelerating is also increasing. In this paper, an electric vehicle is used to evaluate the tire noise during acceleration. The semi-anechoic chamber is used for more robust tire noise test. The radiated sound power of tire under accelerated is measured and it is compared with the pass by noise test on ISO 10844 road surface. In this study the drum radius effect is studied to enhance the correlation. The contact shape simulation on drum surface is studied and base on this result the bigger radius of drum is suggested to enhance the correlation. Finally the radius of drum is changed and re-test result shows the big drum radius is the better correlation than smaller.
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