This paper presents a new type of test device, which is the 45-degree incident angle sound absorption coefficient (SAC) test device. A V-shaped acoustic wave-guide with the two branches forming a 45 degree angle from the horizontal direction was designed to measure the sound absorption coefficient of installed trim materials. The device was also designed for the subjective evaluation and objective psychoacoustic metric target setting of a sound source. The 45-degree incident angle sound absorption coefficient test device can also be applied to the design of the vehicle interior trim materials or sound package to minimize the negative effect of interior noise. The measurement principle of the 45-degree incident angle SAC device will be introduced first, and the experiment procedure will be then illustrated. Different kinds of trim materials were tested. The measured sound pressure data was processed with the help of the MATLAB program codes, and then the sound absorption coefficient curves were calculated and plotted. The results show the 45-degree incident angle sound absorption coefficient measurement device is a useful tool for the measurement of the trim materials for their sound absorption coefficient and for analysis of their effect on the psychoacoustic performance of a sound source. Meanwhile, a psychoacoustic analysis of sound pressure data of a sound source using ArtemiS software allows for the design of a preferred sound in the device using trim materials. These have been tested by the 45-degree incident angle SAC device.

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