Abstract:

A software system was developed for subjective evaluation test of vehicle interior sound quality under nonsteady driving condition. It was employed for the subjective evaluation of the interior noises of six types of cars during acceleration from 50 km/h to 120 km/h. The subjective rate of each sample was obtained by this software first. Then several primary objective psychoacoustical parameters of these samples were calculated. Using correlation analysis and multidimensional linear regression analysis, a mathematical model of sound quality was established, in which the loudness and roughness were taken as the variables. The subjective evaluation test was carried out for other six samples under different acceleration condition to verify the accuracy of the proposed model. It was shown that there exists a strong correlation between the model evaluation result and subjective evaluation result, which validates the model.

Key words: vehicle engineering, sound quality, vehicle interior sound, subjective evaluation