Madhava reddy, design and optimization of exhaust silencer in automobiles, international journal of automobile engineering research and development, issn 22774785 vol. The study is carried out on ashok leyland passenger busses. A flexible exhaust connection has three primary functions. Static analysis of silencer design for the same repeated cycles. Automobile exhaust system, exhaust nsd rear muffler. Keith hudson and chris luchini department of applied science university of arkansas at little rock, little rock, arkansas. Design of mufflers and silencers noise and vibration short course dept. Design and analysis of automotive silencer for effective corrosion control kannan p 1, jayaseelan v 32, gopalakrishnan d, ashok m 4. This ultimate aim has led to a vast expenditure of time and effort in reducing the exhaust noise of the common automobile engine and until recently the design of adequate silencers has remained largely empirical.
Pdf design principles for an automotive muffler researchgate. Sound is attenuated due to absorption conversion to heat sound absorbing material e. G resonators used as side branches attenuate sound in the main duct or pipe. It should be noted that teg technology can be incorporated with other technologies such as pv, turbocharger or even rankine bottoming cycle technique to maximize energy efficiency, reduce fuel consumption and green house gas ghg emissions. These sheets are then given the desired shape with the help of power presses, edge folding machines and bending rollers. To examine the performance of any muffler, certain parameters are used.
A circular shaped cross section is the best suited in the vehicle as it is delays the onset of. Silencer is a device used in automobile vehicles to reduce the noise produced by the. To open the pdf files you will need acrobat reader which is avaiable for free on this page. Theoretical vibrational analysis of automotive exhaust silencer. Wonnacott military vehicles and enghzeering establishment, chertsey, surrey, england received 19 april 1974 subject to the analytical and experimental work completed by drs p. Secondly, the silencer size is selected to accommodate the specified volume. Vibration analysis and design modification of automobile. Exhaust noise from an internal combustion engine is one of the root cause for traffic noise pollution. Automotive mufflers need to be designed considering the sound wave propagation and noise cancellation physics behind it. This noise deadening device is especially one forming part of the exhaust system of an automotive vehicle. Muffler is an essential component in the automobile which is used to reduce the noise from the engine. The aim of this thesis is to provide a deeper understanding of the dynamics of automobile exhaust systems to form a basis for improved design and the. By using a absorptive material double transmission loss can achieve. Sep 25, 2019 sep 25, 2019 profound via comtex the report provides rational insights along with historical and forecast data to aid in better understanding of the global automobile silencer assembly market.
Sep 25, 2019 profound via comtex the report provides rational insights along with historical and forecast data to aid in better understanding. Journal of sound and vibration 1974 371, 1726 lower exhaust noise from better silencer design techniquest e. Design and analysis of automotive muffler design,and,analysis,of, automotive,muffler. Design and fabrication of silencer waste heat power. Muffler is a very important part of the vehicle exhaust system to reduce the noise produced by engine combustible products when passing through the exhaust. Silencers are also used in many other engines and generators. Mufflers are designed to increase the back pressure so as to reduce the noise level. Ganesha b b department of mechanical engineering vvce mysuru, india mr. Pdf design and analysis of an automobile exhaust muffler. The attributes of a typical quietduct silencer include.
It is good practice to design a muffler to work best in the frequency range where the engine has the highest sound energy. Review the existing design and consider improvement for negating the harmful influences of the phenomena 2. Silencer, muffler, exhaust gas resonator, frequency analysis. Due to atmosphere protection and to prevent bad content of gases, normally silencer is provided to any system to which combustion take place or that generates the exhaust gases. This drawing shows a 3 chamber critical grade muffler. Design and development of automobile silencer for effective. Automobile silencer is a device used in automobile vehicles to reduce the noise produced by the exhaust gases of the engine. Design and thermal analysis of motor bike exhaust silencer. With just a maglite and a few other pieces of equipment you can make your very own suppressor out of a flashlight. Flow considerations in industrial silencer design george feng, kinetics noise control, inc.
Automotive mufflers usually have a circular or elliptical cross section. Reactive mufflers are used widely in car exhaust systems where the exhaust gas flow and hence noise emission varies with time. Design and thermal analysis of motor bike exhaust silencer a. Ic engines are one of the major sources of noise pollution. Vibrational analysis of automotive exhaust silencer based on. Automobile silencer assembly market latest indepth report. A muffler silencer in british english is a device for reducing the noise emitted by the exhaust of an internal combustion engine. Reactive silencer design is based either on the principle of a helmholtz resonator or. Design, fabrication and model analysis methods of the muffler are also discussed. In practice the sound spectrum of an engine exhaust is continually changing, as it is dependent on the engine. Page objectoftheinvestigation 1 theory 3 calculationofmuffleralonglines followedinpreceedingtheory 11 thetests 15 descriptionofapparatus 16 descriptionofliufilerstested 19 datasheet 20 calculationofresults 21 resultsandconclusions 22 curves 25 figures 30. The purpose of this study was to find out the essential parameters affecting the design of a silencer and to develop a. Calculation and design of exhaust noise mufflers for power engineering equipment igolkin a. Engineering 21 university of kentucky g the sidebranch resonator is analogous to the tuned dynamic absorber.
Bellows are typically used for exhaust systems with a diameter of 200 mm 8 in and larger. By using a absorptive material double transmission loss can achieve a. Figure 1 shows a twin chamber silencer design having intrusion. Vibrational analysis of automotive exhaust silencer based. The paper deal s with the design of a commercial automotive muffler, which is being used in current automobile vehicles. Types of silencers absorber diffuser combined silencer inline silencer dump tube collecting pipe rental silencer 1. Acoustic performance design of automotive muffler comsol.
Vibration analysis and design modification of automobile silencer. Kulkarni3 1student, 2professor, department of mechanical engineering, rajarshi. Bharath m n department of mechanical engineering vvce mysuru, india abstract the hot gases which generate from combustion of fuel passes through the exhaust system of the automobile as they. Shellnoise radiation minimized by doubleskin or splitter construction in most models. The product offered by automobile silencers companies are high in demand. Testing concludes that the exhaust system meets fsae regulations of 110 db at max engine speed and 100 db at idle. Reactive silencers, which are commonly used in automotive applications, reflect the. Diy plans for a super simple diy silencer concerned. Performance enhancement of automotive silencer using. Modal analysis of muffler of an automobile by experimental. Every exhaust system of an industrial or automobile system where hot gases discharge from the combustion chamber into the surrounding atmosphere at relatively high velocities has a silencer as an integral part of the system. Most auto repair stores and shops carry muffler silencers to fit many makes and models.
Silencer accomplishes the muffling of this exhaust noise. The present material used in automobile silencer is mild steel in which were going to analyze the load and thermal. The design of a muffler is to reduce the noise, for that an existed automobile muffler has modified and compared with the. Exhaust optimization for viking motorsports formula sae. Journal of research in science, technology, engineering. Pdf mufflers are important part of engine system and commonly used in exhaust system to minimize sound transmissions caused by exhaust. Material selection the present material used in automobile silencer is mild steel in which were going to analyze the load and thermal. Page objectoftheinvestigation 1 theory 3 calculationofmuffleralonglines followedinpreceedingtheory 11 thetests 15 descriptionofapparatus 16 descriptionofliufilerstested 19. Noise from automobile is one of component noise pollution to the environment 1. The study depicts the common causes of silencer failures. Design of mufflers is a complex function that affects noise characteristics, emission and fuel efficiency of engine. Present day engines are required to have more engine power and are also required to meet the strict pollution standards. Two typical reactive muffler designs are shown in figure 3. Keywords exhaust system, local heat transfer coefficient, effective heat transfer area, dimple pattern.
The silencers are then cleaned and packed for dispatched. G the transmission loss is confined over a relatively. Exhaust system of an automobile consist of three parts such as exhaust manifold, catalytic converter and silencer out of those silencer having very short life span as there is lot of. Automobile engineering, hindustan university, chennai t.
Design and fabrication of silencer waste heat power generation system 3 efficiency of the vehicles. First of all, a degree of silencing is chosen that will satisfy the noise requirements unique to each engine and location. It achieves its supercritical status primarily from its length, as much as 16x pipe. Every exhaust system of an industrial or automobile system where hot gases discharge from the combustion chamber into the surrounding. The intent of the competition is to provide universities with an. Diy plans for a super simple diy silencer 1 the maglite suppressor. Performance enhancement of automotive silencer using finite.
Design and analysis of perforated muffler in automobile exhaust. Theoretical vibrational analysis of automotive exhaust. If these gases are released into the atmosphere witho. Vibration analysis of an automotive silencer for reduced. While doing so it is subjected to thermal, vibration and fatigue failures. The straightthrough design shown here is very useful for absorbing high frequency selfgenerated noise created by reactive mufflers. It is therefore important for design engineers to be able to predict, describe and assess the dynamics of various system design proposals during product development. The automotive silencer attempts to reduce the audible. By technology these types of mufflers are designed in advanced way now a days. Initially the muffler is designed in the basic 3d modelling can be done using commercial cad software package and can be imported into commercial fem software using a neutral file format. Design and analysis of perforated muffler in automobile. When exhaust gases are removed ouside the combustion chamber at the end of the combustion process, the gases move into the exhaust manifold at high pressure and at a considerably high speed. This is one of the coolest ways to make a diy silencer.
Evaluate the influence of the vibrations over the design of the silencer 3. Engine exhaust silencers choosing the correct exhaust silencer for a given engine is an important although not difficult task. Initially the muffler is designed in the basic 3d modelling can be done using commercial cad software package and can be imported into commercial fem software using a. Design and analysis of perforated muffler in automobile exhaust system vijay m mundhe, eknath r deore abstract a muffler is an important part of an engine system used in exhaust system to reduce exhaust gas noise level. Amongst power train parts in an automobile silencer is the major noise reducing structure. In figure 14 and figure 15, the silencer downstream of a butterfly. Dynamics of duct silencer design proper structural design assures long, troublefree life. Finally, these two halves are assembled, gas welded and painted. Pdf design principles for an automotive muffler pradyumna. Advanced twostroke tuned exhaust system the challenge the society of automotive engineers clean snowmobile challenge 2002 sae csc 2002 is an engineering design competition for college and university student members of the society of automotive engineers sae. If your cars muffler is so loud its waking the neighbors and scaring small dogs, consider installing a muffler silencer. The exhaust gases coming out from engine are at very high speed and temperature. Selamet et al,4 the acoustic attenuation of a singlepass, perforated concentric silencer filled with continuous strand.
Selamet et al,4 the acoustic attenuation of a singlepass. Learn more about the functions and working principles of automobile silencers here. The size, shape and construction of silencer differs according to the type and size of the engine. Flexible connections should be installed as close as possible to the engine exhaust outlet. If pressure drop through the silencer is important to the application, efficient flow modifiers such as turning vanes or diffusers can be added upstream of the silencers. Pdf present day engines are required to have more engine power and are also required to meet the strict pollution standards. Muffler design is an important research area for automotive industries because of new regulations and standards for noise emission. This paper postulates the first stage in the design of an exhaust system, with the specified properties. Calculation and design of exhaust noise mufflers for power. Design and thermal analysis of motor bike exhaust silencera. The sheets are cut into the required size and shape. In an automobile the exhaust muffler plays an integral role in reducing the sound of the automobile, as well as the ride itself. Exhaust mufflers are designed to reduce sound levels at these.
Lower exhaust noise from better silencer design techniques. Ic engines are wide area of applications like automobile applications, marine applications, power generation, agricultural applications, light aircrafts etc. Design of mufflers is a complex function that affects noise characteristics. Dieformed, singlepiece splitter construction throughout. General design principles for an automotive muffler australian. General design principles for an automotive muffler potente, daniel day design pty ltd, acoustical consultants, sydney, nsw au abstract this paper discusses the general principles of muffler design and explains the main advantages of various styles of mufflers. In this study, attempt has been made to improve the design of muffler for reducing noise. Evaluation of design alternatives for automobile silencer while addressing compliance to the generic norms for vibration balraj. Pdf acoustic performance design of automotive muffler. Design and analysis of automotive silencer for effective.
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