Abstract
When buying a car, the acoustic impression of quality of a vehicle drive train is becoming more and more relevant. The perceived sound quality of the engine unit plays a key role here. Due to the nature of individual background noises, that sound quality is negatively influenced. These noise components, which are perceived as unpleasant, need to be further reduced in the course of vehicle development with the identification and evaluation of disruptive noise components in the overall engine noise being a prerequisite for effective acoustics optimization. In particular, the pulsed ticker noise is classified as particularly annoying in Otto DI engines, which is why this article aims to analyze and evaluate the ticking noise components from the overall noise. For this purpose, an empirical formula was developed which can classify the ticking noise components in terms of their intensity. This is purely perception-based and consists of the impulsiveness, the loudness and the sharpness of the overall engine noise. As with other psychoacoustic evaluation scales, the rating was made from 1 (very ticking) to 10 (not ticking). The ticker noise evaluation formula was then verified on the basis of hearing tests with the help of a jury of experts. According to this, it can be predicted precisely in which engine map areas the ticker noise undermines the pleasantness of the overall engine noise.
Highlights
The requirements placed on modern combustion engines are becoming increasingly stringent due to stricter legislation and growing demands on the part of customers
In the context of this contribution, an empirical formula is to be developed based on acoustic measurements and evaluations, which is to evaluate the intensity of the ticker noise for stationary operating points
The differences between the background noises on the gasoline engine were examined more closely with regard to the relevant psychoacoustic parameters, whereupon the original evaluation approaches for the ticker noise were examined
Summary
The requirements placed on modern combustion engines are becoming increasingly stringent due to stricter legislation and growing demands on the part of customers. In addition to limitations in terms of emissions and fuel consumption, the focus on the acoustics of an internal combustion engine comes more to the fore. High-pressure direct injection in particular has a considerable influence on the acoustic interference behavior of both diesel and gasoline engines. The overall noise of internal combustion engines is getting quieter despite the increase in performance and lightweight construction due to new technologies. Background noises, which are perceptible as disturbing, increasingly come to the fore. Well-known disturbing noises include the so-called diesel knocking and the ticker noise. In the context of this contribution, an empirical formula is to be developed based on acoustic measurements and evaluations, which is to evaluate the intensity of the ticker noise for stationary operating points
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