scholarly journals Experimental Study of Orifice Shape Effect on Noise Reduction of Silencer

2020 ◽  
Vol 7 (2) ◽  
pp. 1-12
Author(s):  
Muna S. Kassim ◽  
Ammar Fadhil Hussein Al-Maliki ◽  
Hayder M. Mohammed
Keyword(s):  
Experimental Study ◽  
Noise Reduction ◽  
Transmission Coefficient ◽  
Internal Combustion Engines ◽  
Noise Pollution ◽  
Shape Effect ◽  
Combustion Engines ◽  
Transmission Losses ◽  
Matlab Program ◽  
Different Shapes

Abstract: Noise pollution is one of the most problems caused by internal combustion engines. In this study, the reduction of noise by changing the orifice shapes and inserting tape is experimentally investigation. The effect of orifice shape on noise reduction of silencer is presented. The calculation of transmission losses and transmission coefficient of noise for different shapes of orifice by using MATLAB program is obtained. In addition, the frequency for maximum and minimum losses is obtained. The results showed that the use of the square orifice and helical tape were better options to reduce the noise in the silencer.

scholarly journals Experimental Study of Pipes Shape Effect on Noise Reduction

2017 ◽  
Vol 5 (1) ◽  
pp. 71-86
Author(s):  
Muna S. Kassim ◽  
Ammar Fadhil Hussein Al-Maliki
Keyword(s):  
Experimental Study ◽  
High Pressure ◽  
Noise Reduction ◽  
Power Plants ◽  
Combustion Engine ◽  
Exhaust System ◽  
Noise Pollution ◽  
Shape Effect ◽  
Pipe Length ◽  
Exhaust Noise

Internal combustion engine is a major source of noise pollution. These engines are used for various purposes such as, in power plants, automobiles, locomotives, and in various manufacturing machineries. The noise is caused by two reasons; the first reason is the pulses which created when the burst of high pressure gas suddenly enters the exhaust system, while the second reason is the friction of various parts of the engine where the exhaust noise is the most dominant. The limitation of the noise caused by the exhaust system is accomplished by the use of silencers and mufflers. The aim of this study is the reduction of the noise by changing its inlet and outlet pipe length and shape. Also the losses in noise for different length and shapes have been investigated experimentally. The results show that the corrugated pipe is preferable for noise reduction.

scholarly journals Experimental study on noise reduction and performance enhancement for internal combustion engines

2020 ◽  
Vol 318 ◽  
pp. 01014
Author(s):  
Ioan Radu Şugar ◽  
Mihai Banica
Keyword(s):  
Experimental Study ◽  
Combustion Chamber ◽  
Noise Reduction ◽  
Fuel Consumption ◽  
Internal Combustion Engines ◽  
Performance Enhancement ◽  
Ceramic Materials ◽  
Combustion Engines ◽  
Large Cities ◽  
And Performance

As the number of cars increases and large cities become more and more crowded, noise reduction becomes more and more important. The decrease of the fuel consumption and the increase of power to the same cylindrical capacity are always current topics. This paper’s aim is to bring a contribution to solving these problems. The proposed solution consists in the use of ceramic materials in the design of the combustion chamber.

scholarly journals AUTOMOBILE INTERNAL COMBUSTION ENGINE PRESSURE CHARGING AND GAS-GUIDE LOW FREQUENCY NOISE REDUCTION USING ACTIVE SOUND SOURCES

Akustika ◽  
2019 ◽  
Vol 34 ◽  
pp. 118-122
Author(s):  
Andrey Vasilyev
Keyword(s):  
Noise Reduction ◽  
Internal Combustion Engines ◽  
Acoustic Pressure ◽  
Combustion Engine ◽  
Low Frequency ◽  
Internal Combustion ◽  
Frequency Noise ◽  
Combustion Engines ◽  
Sound Sources ◽  
Automobile Engines

Pressure charging devices in different types of internal combustion engines is allowing to achieve a number of advantages: engine power and fuel effectiveness increasing, exhaust gases toxic reduction etc. Pressure charging systems may be classified by the different parameters. For the time being turbo-supercharger is the most popular unit of serial automobile engines pressure charging. But it has some negative properties. Therefore using of dynamic (acoustic) pressure charging devices is promising solution. Analysis of existing acoustic pressure charging systems is carried out. The perspectives of using of active sound emitters for acoustic pressure charging are described. Theoretical issues of automobile engines active acoustic charging are discussed. Construction of active charging system is suggested. Multifunctional approach to automobile internal combustion engines pressure charging and low frequency intake and exhaust noise reduction is suggested. The results described in this paper may be useful for further development and application of internal combustion engines with improved consumer’s and ecological characteristic.

scholarly journals Development of a methodology for calculating the working process of a small-size two-stroke internal combustion engine

2021 ◽  
Vol 20 (3) ◽  
pp. 97-109
Author(s):  
V. V. Biryuk ◽  
A. A. Gorshkalev ◽  
M. O. Zakharov ◽  
V. L. Larin
Keyword(s):  
Experimental Study ◽  
Internal Combustion Engine ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Experimental Studies ◽  
Internal Combustion ◽  
Maximum Speed ◽  
Combustion Engines ◽  
Working Process ◽  
Power Characteristics

On the basis of the available theoretical calculations, methods for calculating the working process and power characteristics of internal combustion engines and the experimental studies carried out, a method for calculating the working process for small-sized two-stroke internal combustion engines was developed and tested. In the course of this work, the following results were obtained: the parameters of the working process and power characteristics of a small two-stroke internal combustion engine; the parameters obtained by calculation during the study of the Evolution 20GX2 engine were compared with the results of an experimental study. According to the results of the comparison, deviations in the values of the parameters of the engine under study from the results of the experimental study at the maximum power and maximum speed modes were identified.

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