Effect on car interior sound quality according to the variation of noisy components of tire-pattern noise

摘要

A tire noise is one of the important noise sources of vehicle. Especially, it becomes more dominant one for motor-driven vehicle such as electric or hybrid vehicle. The purpose of this study is to grasp the effects of the variation of noise components of tire-pattern noise on car interior sound quality. To this end, tire noises were recorded with a compact car but with different types of tire pattern. Noisy components of each tire noise were indicated and then the noisy components were modified with their peak level, half-power bandwidth, and position on frequency domain. By employing subjective listening tests whose target was to evaluate the extent of annoyance of the modified noises, the change tendency of annoyance according to the variation of the noisy components was investigated and an index was proposed that could estimate and predict the annoyance of tire-pattern noise. In addition, it was known that energy ratio of a noisy component to background noise in the frequency range that the noisy component exists was one of the important descriptors representing the annoyance of tire-pattern noise.