The National Transport University Bulletin

Abstract

In the present paper the use of a newly developed exhaust gasses muffler for external noise reduction of a military vehicle is proposed. The object of the study is tactical armored vehicle «Kozak-2M1» that was created for the needs of the Airborne Assault Forces and the Special Operations Forces of the Armed Forces of Ukraine and can be used for designed to perform a wide range of combat tasks. The purpose of the study is to reduce the external noise level of a military vehicle by using a fundamentally new type of internal combustion engine exhaust gases muffler. The research method is computational. One of the types of masking of the military vehicles is the reduction of their level of external noise, which is an essential unmasking factor. This work considers the application of a newly developed muffler for an internal combustion engine exhaust gases, the fundamental novelty of which is the passage of exhaust gases through a liquid inside the muffler, in which three processes take place: physical (shredding of exhaust gases into small components (bubbles) and partial dissolution), chemical (exhaust gases enter into a chemical interaction with the liquid, as a result of which they are cleaned of harmful components) and acoustic (acoustic waves that moved in the exhaust gases are absorbed by the liquid). To implement chemical reactions of exhaust gases with liquid, it is proposed to use chemical cartridges in the muffler. Water can be taken as the basis of the liquid. After the liquid becomes saturated with harmful substances, it is necessary to replace together (if necessary) with chemical cartridges. The use of an electric motor and sound and vibration-absorbing materials are proposed for further increase of the newly developed muffler efficiency. Geometric dimensions of the developed liquid muffler were calculated based on the working volume of the engine and the maximum rotation frequency of the crankshaft, a muffler sketch is also provided.

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