Analysis And Test Based On The Resistance Of The GT-POWER Exhaust Muffler

Installing exhaust muffler is the simplest and the most common measure to reduce exhaust noise of internal combustion engine, the good design of noise performance and the exhaust muffler which is less effect on internal combustion engine power output has been one of the most important issues of internal combustion engine noise control. The internal structure size and parameters variation of exhaust muffler has some influences on muffler noise reduction. In the former research, the early development and design is though designers' experience and simulation tests. This paper analyzed the structure of reactive muffler which has four expansion chamber. Then ascertaining the object of research is the length proportional distribution of each muffler expansion chambers. Through comparing the calculation and analysis of GT-POWER simulation software results with actual tests results, obtains the conclusion that changing volume of expansion chambers affect the acoustics performance of the exhaust mufflers.It is an significant meaning to the development of the muffler design, so take it as the main content and purposes of this research.This paper mainly researched the muffler model that is original 4100QBZ internal combustion engine exhaust muffler. The first, the structure of the original model of muffler was analyzed though the silencing basic theory of muffler, then set up the test plan that researched the length of each muffler expansion chambers.Second use GT-MUFFLER simulation modeling software to establish 3-division model of the muffler, and use GT-POWER simulation software builds the transmission loss calculation platforms and pressure loss calculation platforms. Through the simulation of the each muffler test plan, and get the result of acoustics performance and resistance performance to ensure that each expansion chambers affect the acoustics performance of the exhaust mufflers.Research results show that:to change the length of the first muffler expansion chamber can improve acoustics performance under low speed of the internal combustion engine. Silencing effect has obvious in low and medium frequency range, the silencing effect is not obvious in the high frequency range:to change the length of the last muffler expansion chamber can improve acoustics performance under whole speed range. and improve the overall internal combustion engine exhaust noise reduction:To change the length of the middle muffler expansion chambers can just improve a few silencing quantity in only a small frequency range, the rest range of silencing quantity has no effect. It can provide theoretical help for the structure design of muffler through the research that is to change the length proportional distribution of each muffler expansion chambers. It is more reasonable design and better silencing performance to use this plan that is proportional distribution of each muffler expansion chambers.