Psychoacoustic evaluation of internal combustion engine noises

摘要

When buying a car, the acoustic impression of quality of a vehicle drive train is becoming more and more relevant. The perceivedsound quality of the engine unit plays a key role here. Due to the nature of individual background noises, that soundquality is negatively influenced. These noise components, which are perceived as unpleasant, need to be further reducedin the course of vehicle development with the identification and evaluation of disruptive noise components in the overallengine noise being a prerequisite for effective acoustics optimization. In particular, the pulsed ticker noise is classified asparticularly annoying in Otto DI engines, which is why this article aims to analyze and evaluate the ticking noise componentsfrom the overall noise. For this purpose, an empirical formula was developed which can classify the ticking noisecomponents in terms of their intensity. This is purely perception-based and consists of the impulsiveness, the loudness andthe sharpness of the overall engine noise. As with other psychoacoustic evaluation scales, the rating was made from 1 (veryticking) to 10 (not ticking). The ticker noise evaluation formula was then verified on the basis of hearing tests with the helpof a jury of experts. According to this, it can be predicted precisely in which engine map areas the ticker noise underminesthe pleasantness of the overall engine noise.