Abstract
The powertrain of passenger cars is now in place of an electric motor instead of a conventional reciprocal gasoline engine for reducing carbon dioxide for not to increase atmospheric temperature. By this change, sound emitted from passenger cars are becoming quieter compared with the former stage. And because of this, exterior and interior sound atmosphere are far quieter than before and while running on the road, interior tire-road noise and tire-pattern noise are more significant under quiet atmosphere. So, the treatment of tire-road noise is important for comfortable atmosphere. This paper deals with the tire-road noise for better impression in that how we should deal with the tire-road noise in frequency content.
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