Abstract
The problem of reduction of internal combustion engine (ICE) noise is most urgent at present when the fleet of vehicles has significantly expanded and their power has increased. Reactive mufflers are often used to solve it. The initial stage in the design of mufflers is a theoretical assessment of the frequency spectrum of sound power level (SPL) of an unmuffled ICE noise source, comparing it with the calculated maximum permissible spectrum and determining the required amount of its reduction in standard frequency bands. The paper presents a method for calculating the required noise reduction of a transport engine exhaust using the example of a two-stroke ICE of the class of 125 cm3. Thus, the designer has the opportunity to develop mufflers, the acoustic efficiency of which meets the calculated required noise reduction values, already at an early stage of the vehicle design.
Highlights
Due to technological progress, the number of noise sources is constantly growing
Motor vehicles equipped with two-stroke carburetor internal combustion engines (ICE) with a crank-chamber purge system have especially high noise levels
The most powerful noise source in a transport engine is its exhaust system, so the development of high-performance mufflers is of paramount importance
Summary
Due to technological progress, the number of noise sources is constantly growing. The most powerful noise source in a transport engine is its exhaust system, so the development of high-performance mufflers is of paramount importance. It becomes necessary to develop and apply calculation methods for determining the frequency spectrum of sound power level (SPL) of the ICE exhaust noise, to develop a method for calculating the maximum permissible SPL spectrum of the exhaust noise, the comparison of which makes it possible to find the required noise reduction of a given source depending on the sound frequency presented in the works. This paper is devoted to the solution of this problem by the example of calculating the required noise reduction of the exhaust of a two-stroke carburetor engine of the class of 125 cm
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