Analysis of sound quality of a fuel cell vehicle based on orthogonal test 2019-01-0384
Different from the traditional vehicle, the noise source of fuel cell vehicle has the characteristics of large quantity and amplitude, uneven distribution, so the sound quality of each position in the vehicle is very different. This paper focuses on the research of change regulation of vehicle interior sound quality in different positions and the characteristic frequency band which affects the sound quality. In this paper, the interior sound quality of a fuel cell vehicle under different uniform speed conditions was studied experimentally. The acoustic quality evaluation parameters involved in this paper include the A-weighted sound pressure level, loudness, roughness and sharpness. The results showed that with the increase of vehicle speed, the A-weighted sound pressure level, loudness and roughness at human ear of front seat and rear seat were all increasing, and the A-weighted sound pressure level, loudness and roughness of rear seat were higher than front seat of 3.4dB(A),4.2sone and 0.03asper. Different from the above three evaluation parameters, the sharpness of front and rear seats was fluctuating with the increase of vehicle speed. However, the sharpness of all seats reached the minimum under the condition of 100kph constant speed, and the sharpness of the rear seat was lower than that in the front seat on average 0.03 acum. In order to further study the influence of different frequency bands on the evaluation parameters of sound quality, the orthogonal analysis method is used to process the amplitude modulation of the original sound signal on different frequency bands. The method refers to the principle of dividing critical frequency band in Bark domain. Thus, the contribution of different frequency bands to each sound quality parameter is obtained. The results showed that the frequency range which had the greatest influence on the A-weighted sound pressure level, loudness, roughness and sharpness was 0~510Hz. For the A-weighted sound pressure level, loudness and roughness, the second influence frequency range was 510~1270 Hz, and for sharpness the second influence frequency range was 2700~6400Hz. In addition, the order of contribution of each frequency band to the evaluation parameters has little relation with the seat position and the vehicle speed.
Xiang Ji, Dong Hao, Yanyi Zhang, Hai Liu, Yong Chen, Zeyu Liu
Hebei Univ. of Technology, CATARC Co., Ltd.