SlideShare a Scribd company logo
1 of 19
A Research Paper
“Overview of Reactive Muffler”
Submitted To:
Dr. Colin Novak
Submitted By:
Devarsh Patel (104861000)
Bandhav Fadia (104817821)
AUTO APPS FOR NOISE/ VIBRATION/ HARSHNESS
(06-85-525-01)
CONTENTS
 Introduction
 Reactive muffler Geometric Design
 The Reactive muffler design considerations
 Helmholtz Resonator
 Case study on LCV Diesel engine vehicle
 Corrosion Effect on reactive muffler
 Conclusion
 References
INTRODUCTION
Automobile
Noise
Sound &
Vibration
Noise
Reductiuon
Noise is characterized as undesirable
sound.
Engine exhaust noise is one of the major concern of
every automobile company
Motivation behind a Reactive muffler is to
decrease vehicle exhaust noise
Reactive muffler Geometric Design
Figure 1: Geometric design of reactive muffler
The geometrical shape of reactive muffler consists of numerous chambers, flow diffusers, tuned resonated
cylinders, and discharge tube connected with the outlet connection pipe
The Reactive muffler design considerations
1. Acoustical consideration:
Insertion loss Transmission loss
• It is defined as the difference between the
acoustic power radiated without and
with a muffler fitted.
• It is defined as the difference (in
decibels) between the sound power
incidents at the entry to the muffler to
that transmitted by the muffler.
The Reactive muffler design considerations
2. Aero dynamic consideration with backpressure:
• Aerodynamic consideration
specifies the flow of exhaust
gases from muffler to create
less pressure in muffler.
• The extra static pressure
generated by the muffler on
the vehicle engine through
restriction in flow of exhaust
fumes to achieve higher
noise reduction may result in
higher backpressure to the
engine.
Figure 2: Aerodynamic flow diagram of reactive muffler
The Reactive muffler design considerations
3. Mechanical consideration:
4. Economical consideration:
• Mechanical considerations are taken for material selection, which decide muffler’s
durability
• The material properties of exhaust required for the hot section include good strength for
high temperature, thermal fatigue properties, oxidation and salt corrosive resistance.
• Majorly two types of materials used in manufacturing the reactive muffler which include
Stainless steel and the Aluminum
• Muffler must have to be less expensive with consideration of design cost, material cost and
fabrication cost
• The performance of muffler may matter by its cost
Helmholtz Resonator
• It is used in car exhausts to alter the sound of the exhaust note and for differences in power
delivery by adding chambers to the exhaust muffler
• Exhaust resonators are also used to reduce potentially loud and obnoxious engine noise
• The waves reflected by the resonator helps to cancel out certain frequencies of sound in the
exhaust.
Figure 3: Helmholtz resonator in muffler chamber
Case study on LCV Reactive muffler
Shital S., Saisankaranarayana K, Kalyankumar S. and Prof. Thombare performed Experiment on low commercial vehicle
diesel engine vehicle. Designed Reactive muffler by deciding a target of required transmission loss.
Case study on LCV Reactive muffler
Targeted data:
Bore Diameter (D) 80 mm
Stroke Length (L) 98 mm
No. of cylinder (n) 3
Engine Power (P) 65 hp
Maximum RPM (N) 3500 rpm
Targeted transmission
loss (dB)
30 dB
Engine Input data:
Target Frequencies
Cylinder Firing Rate:
CFR = Engine max speed/120 for 4 stroke engine
CFR = 3500/120 = 29.17 Hz
Engine Firing Rate:
EFR= No. of cylinder * CFR
EFR= 3*29.17 = 87.50 Hz
Engine- Benchmarking Data
Muffler Volume calculation
Volume of muffler (Vm) = Vf ×
[
𝜋
4
×D2x 𝐿] ×
𝑁
2
Volume factor is taken as 16
So, Volume of muffler (Vm) = 11.83 Lit
Case study on LCV Reactive muffler
Virtual Simulation
CFD analysis:
There will have steady pressure drop which is related to flow and geometry of air passages by supplying steady air flow
through mufflers. Pressure drop in muffler is important tool for the design and development of mufflers. All three concept
of muffler are tested for flow analysis using CFD simulation tool
(a): Concept 0A (b): Concept 0B (c): Concept 0C
Figure CFD Model of Concept 0A, 0B, 0C
Case study on LCV Reactive muffler
Virtual analysis:
The mean flow performance of the three mufflers considered in the acoustic analysis has been assessed. Frequency
range for this case study is taken in 10-2000 Hz. Reflection on inlet and outlet end cover is neglected
From the virtual analysis of transmission loss it can see that concept 0A is having better transmission loss compared to
other concept 0B and 0C in initial frequency range 20 Hz to 600 Hz. As well as in mid frequency range of 1000 Hz to
1400 Hz.
Case study on LCV Reactive muffler
Prototype manufacturing and experimental testing:
Some important factors have to take care such as there
should not be any gas leakage
The experimental determination of backpressure on
engine and transmission loss.
The prototypes of all concepts that are made at the
above step are tested for the transmission loss to verify
the target value.
All three concept muffler tested on engine for evaluate
back pressure measurement.
Case study on LCV Reactive muffler
As per the results received from FFT analyser transmission loss v/s frequency schematic diagram is plot for all three
different mechanical exhaust concept models. Transmission loss is calculated between 10 dB to 60 dB to frequency
range.
From the experimental frequency and transmission loss plot, it has been observe that concept 0A is having higher
transmission loss in same initial frequency range 20 to 600 Hz.
By comparing virtual analysis and prototype experimental results, best concept muffler is identified, also for back
pressure CFD results are compared with engine back pressure results. Based on this compression concept 0A selected
Corrosion effect on Reactive muffler
The main drawback of reactive muffler is corrosion, which is happen due to exhaust gas condensate
In general practice it is seen that the corrosion problem is mostly observed at a time of short distance driving, when
the temperature does not go high and wet corrosion start due to condensation mainly in the muffler at the cold end
becomes the major factor of failure
Corrosion failures may cause perforation of components causing exhaust leaks in internal components that may
result in noise issues due to change in muffler acoustics and can also result in pollution causing damage to
environment.
Types of corrosion in muffler:
• Condensate Pitting corrosion
• Exterior Salt pitting
• Crevice corrosion
• Oxidation
• Galvanic corrosion
Corrosion effect on Reactive muffler
Conclusion
• This paper emphasizes the importance of the reactive muffler through various
consideration for vehicle noise including their characteristics starting from the
design to proto manufacturing and validation of exhaust muffler.
• The measuring cycle which described in this paper though one case study could
provide the noise and pressure determinations, within the particular design models
made with artificial softwares within specific limitation.
• Practical approach from the concept design to prototype model and validation of
exhaust muffler. This design methodology will help to understand the importance
of each step of design from concept level to validation level. Numbers of attempt,
product development time and cost can save by this practical approach.
References
1. Kuppm P. K. R., Shahab F., & Amiya R. M. (2018). A new sound quality metric for the design of engine exhaust mufflers. Journal of
Automobile Engineering, 232(2), 254-263.
2. Krishnal B., Prof. R.S., & Prof. P.K.S. (2015). Vibration analysis of an Automotive silencer for reduced incidence of failure. International
Journal of Engineering and Technical Research, 2321-0869, 79-84.
3. Potente, D. (2005). General Design Principles for an Automotive Muffler. Australian Acoustical Society, 9-11, 153-157.
4. Nitinkumar A., Kalpana G., Shrikant N., & Santosh S. (2015). Vibration and Noise in Reactive Muffler: A Study. Advances in Mechanical
Engineering Techniques, 12-13,1-5
5. Shital S., Saisankaranarayana K., Kalyankumar S.H., Prof. D.G.T. (2010). A Practical Approach towards Muffler Design, Development and
Prototype Validation. SAE International, 032-0021, 1-16.
6. Krunal C.C., Prof. R.Y.P., Prof. N.R.S., & Prof. S.J.C. (2016). Investigation of Geometrical Parameter on Performance of Muffler Using CFD
Analysis. International Research Journal of Engineering and Technology, 2395-0056, 1332-1338.
7. M. H.N., Z. A.K., A. S., & K. S. (2016). A predictive model for life assessment of automotive exhaust mufflers subject to internal corrosion
failure due to exhaust gas condensation. Engineering failure Analysis, 63, 43-60.
Thank you

More Related Content

What's hot

NOISE REDUCTION SYSTEM IN IC ENGINE
NOISE REDUCTION SYSTEM IN IC ENGINENOISE REDUCTION SYSTEM IN IC ENGINE
NOISE REDUCTION SYSTEM IN IC ENGINEBasavaraj Kichadi
 
Exhaust gas recirculation system
Exhaust gas recirculation systemExhaust gas recirculation system
Exhaust gas recirculation systemrakibul Islam
 
Noise control in IC engine
Noise control in IC engine Noise control in IC engine
Noise control in IC engine Bhargav A
 
Carburetor Theory
Carburetor TheoryCarburetor Theory
Carburetor TheoryJ.T.A.JONES
 
Combustion Chambers in CI Engine
Combustion Chambers in CI EngineCombustion Chambers in CI Engine
Combustion Chambers in CI EngineSuyash Saxena
 
Combustion chambers in si engines
Combustion chambers in si enginesCombustion chambers in si engines
Combustion chambers in si enginesDhruv Shah
 
Engine Performance Improvement
Engine Performance ImprovementEngine Performance Improvement
Engine Performance Improvementmp poonia
 
Chain Drives Selection - Solved Problem
Chain Drives Selection - Solved ProblemChain Drives Selection - Solved Problem
Chain Drives Selection - Solved ProblemVARUN BABUNELSON
 
Carburetor parts and working
Carburetor parts and workingCarburetor parts and working
Carburetor parts and workingShahid Akram
 
Internal Expanding shoe brake.pdf
Internal Expanding shoe brake.pdfInternal Expanding shoe brake.pdf
Internal Expanding shoe brake.pdfmeet kalola
 
Testing and performance of IC engine
Testing and performance of IC engineTesting and performance of IC engine
Testing and performance of IC engineMustafa Bzu
 
BERR EXHAUST SILENCERS
BERR EXHAUST SILENCERSBERR EXHAUST SILENCERS
BERR EXHAUST SILENCERSBerr Industry
 
Positive crankcase ventilation
Positive crankcase ventilationPositive crankcase ventilation
Positive crankcase ventilationNizam Anuar
 

What's hot (20)

NOISE REDUCTION SYSTEM IN IC ENGINE
NOISE REDUCTION SYSTEM IN IC ENGINENOISE REDUCTION SYSTEM IN IC ENGINE
NOISE REDUCTION SYSTEM IN IC ENGINE
 
Exhaust gas recirculation system
Exhaust gas recirculation systemExhaust gas recirculation system
Exhaust gas recirculation system
 
Noise control in IC engine
Noise control in IC engine Noise control in IC engine
Noise control in IC engine
 
Carburetors types
Carburetors typesCarburetors types
Carburetors types
 
Gas turbine
Gas turbineGas turbine
Gas turbine
 
Carburetor Theory
Carburetor TheoryCarburetor Theory
Carburetor Theory
 
Turbo Charger in IC Engines
Turbo Charger in IC EnginesTurbo Charger in IC Engines
Turbo Charger in IC Engines
 
Combustion Chambers in CI Engine
Combustion Chambers in CI EngineCombustion Chambers in CI Engine
Combustion Chambers in CI Engine
 
Combustion chambers in si engines
Combustion chambers in si enginesCombustion chambers in si engines
Combustion chambers in si engines
 
5 shock absorbers
5 shock absorbers5 shock absorbers
5 shock absorbers
 
Engine Performance Improvement
Engine Performance ImprovementEngine Performance Improvement
Engine Performance Improvement
 
Chain Drives Selection - Solved Problem
Chain Drives Selection - Solved ProblemChain Drives Selection - Solved Problem
Chain Drives Selection - Solved Problem
 
Carburetor parts and working
Carburetor parts and workingCarburetor parts and working
Carburetor parts and working
 
Brakes
BrakesBrakes
Brakes
 
Internal Expanding shoe brake.pdf
Internal Expanding shoe brake.pdfInternal Expanding shoe brake.pdf
Internal Expanding shoe brake.pdf
 
Testing and performance of IC engine
Testing and performance of IC engineTesting and performance of IC engine
Testing and performance of IC engine
 
Steam Condensers
Steam CondensersSteam Condensers
Steam Condensers
 
BERR EXHAUST SILENCERS
BERR EXHAUST SILENCERSBERR EXHAUST SILENCERS
BERR EXHAUST SILENCERS
 
Pneumatic engine
Pneumatic enginePneumatic engine
Pneumatic engine
 
Positive crankcase ventilation
Positive crankcase ventilationPositive crankcase ventilation
Positive crankcase ventilation
 

Similar to Reactive muffler

IRJET- Design and Noise Prediction for the Heavy Truck Diesel Engine Muffler
IRJET-  	  Design and Noise Prediction for the Heavy Truck Diesel Engine MufflerIRJET-  	  Design and Noise Prediction for the Heavy Truck Diesel Engine Muffler
IRJET- Design and Noise Prediction for the Heavy Truck Diesel Engine MufflerIRJET Journal
 
EXTERIOR AUCOSTIC AND MODAL ANALYSIS OF MUFFLER OF AN AUTOMOBILE BY EXPERIMEN...
EXTERIOR AUCOSTIC AND MODAL ANALYSIS OF MUFFLER OF AN AUTOMOBILE BY EXPERIMEN...EXTERIOR AUCOSTIC AND MODAL ANALYSIS OF MUFFLER OF AN AUTOMOBILE BY EXPERIMEN...
EXTERIOR AUCOSTIC AND MODAL ANALYSIS OF MUFFLER OF AN AUTOMOBILE BY EXPERIMEN...paperpublications3
 
Numerical Investigation of Jet Noise Prediction in Exhaust Nozzle by Passive ...
Numerical Investigation of Jet Noise Prediction in Exhaust Nozzle by Passive ...Numerical Investigation of Jet Noise Prediction in Exhaust Nozzle by Passive ...
Numerical Investigation of Jet Noise Prediction in Exhaust Nozzle by Passive ...IJERA Editor
 
Numerical Investigation of Jet Noise Prediction in Exhaust Nozzle by Passive ...
Numerical Investigation of Jet Noise Prediction in Exhaust Nozzle by Passive ...Numerical Investigation of Jet Noise Prediction in Exhaust Nozzle by Passive ...
Numerical Investigation of Jet Noise Prediction in Exhaust Nozzle by Passive ...IJERA Editor
 
Reduction of backpressure by subham
Reduction of backpressure by subhamReduction of backpressure by subham
Reduction of backpressure by subhamSubham kumar
 
288_Muffler(1).pdf
288_Muffler(1).pdf288_Muffler(1).pdf
288_Muffler(1).pdfRajatDubey47
 
A Brief Review on Advance Acoustic Control System Process of Automotive Muffler
A Brief Review on Advance Acoustic Control System Process of Automotive MufflerA Brief Review on Advance Acoustic Control System Process of Automotive Muffler
A Brief Review on Advance Acoustic Control System Process of Automotive MufflerIOSR Journals
 
Aqua silencer final report
Aqua silencer final reportAqua silencer final report
Aqua silencer final reportPj Rahman
 
Diffuser in Steam Vent Silencer By Using Computational Fluid Dynamics
Diffuser in Steam Vent Silencer By Using Computational Fluid DynamicsDiffuser in Steam Vent Silencer By Using Computational Fluid Dynamics
Diffuser in Steam Vent Silencer By Using Computational Fluid DynamicsIJERA Editor
 
Vibration Analysis of an Automotive Silencer for Reduced Incidence of Failure
Vibration Analysis of an Automotive Silencer for Reduced Incidence of FailureVibration Analysis of an Automotive Silencer for Reduced Incidence of Failure
Vibration Analysis of an Automotive Silencer for Reduced Incidence of Failurepaperpublications3
 
Suction Duct Optimization for Fume Extraction System
Suction Duct Optimization for Fume Extraction SystemSuction Duct Optimization for Fume Extraction System
Suction Duct Optimization for Fume Extraction SystemIRJET Journal
 
Design and Fabrication of Aqua Silencer for Emission Control as well as Noise...
Design and Fabrication of Aqua Silencer for Emission Control as well as Noise...Design and Fabrication of Aqua Silencer for Emission Control as well as Noise...
Design and Fabrication of Aqua Silencer for Emission Control as well as Noise...IRJET Journal
 
IRJET - Review on Design of Intake Manifold for Air Restricted Engine
IRJET - Review on Design of Intake Manifold for Air Restricted EngineIRJET - Review on Design of Intake Manifold for Air Restricted Engine
IRJET - Review on Design of Intake Manifold for Air Restricted EngineIRJET Journal
 
IRJET- Inquisitive Analytics of Diverse Exhaust System Contingent to Pollution
IRJET- Inquisitive Analytics of Diverse Exhaust System Contingent to PollutionIRJET- Inquisitive Analytics of Diverse Exhaust System Contingent to Pollution
IRJET- Inquisitive Analytics of Diverse Exhaust System Contingent to PollutionIRJET Journal
 
M.E Thesis Presentation
M.E Thesis PresentationM.E Thesis Presentation
M.E Thesis PresentationSUMEET RAIKWAR
 
IRJET- Design and Fabrication of Aerodynamic Aqua Silencer
IRJET- Design and Fabrication of Aerodynamic Aqua SilencerIRJET- Design and Fabrication of Aerodynamic Aqua Silencer
IRJET- Design and Fabrication of Aerodynamic Aqua SilencerIRJET Journal
 

Similar to Reactive muffler (20)

IRJET- Design and Noise Prediction for the Heavy Truck Diesel Engine Muffler
IRJET-  	  Design and Noise Prediction for the Heavy Truck Diesel Engine MufflerIRJET-  	  Design and Noise Prediction for the Heavy Truck Diesel Engine Muffler
IRJET- Design and Noise Prediction for the Heavy Truck Diesel Engine Muffler
 
EXTERIOR AUCOSTIC AND MODAL ANALYSIS OF MUFFLER OF AN AUTOMOBILE BY EXPERIMEN...
EXTERIOR AUCOSTIC AND MODAL ANALYSIS OF MUFFLER OF AN AUTOMOBILE BY EXPERIMEN...EXTERIOR AUCOSTIC AND MODAL ANALYSIS OF MUFFLER OF AN AUTOMOBILE BY EXPERIMEN...
EXTERIOR AUCOSTIC AND MODAL ANALYSIS OF MUFFLER OF AN AUTOMOBILE BY EXPERIMEN...
 
Numerical Investigation of Jet Noise Prediction in Exhaust Nozzle by Passive ...
Numerical Investigation of Jet Noise Prediction in Exhaust Nozzle by Passive ...Numerical Investigation of Jet Noise Prediction in Exhaust Nozzle by Passive ...
Numerical Investigation of Jet Noise Prediction in Exhaust Nozzle by Passive ...
 
Numerical Investigation of Jet Noise Prediction in Exhaust Nozzle by Passive ...
Numerical Investigation of Jet Noise Prediction in Exhaust Nozzle by Passive ...Numerical Investigation of Jet Noise Prediction in Exhaust Nozzle by Passive ...
Numerical Investigation of Jet Noise Prediction in Exhaust Nozzle by Passive ...
 
Ad4102220223
Ad4102220223Ad4102220223
Ad4102220223
 
Reduction of backpressure by subham
Reduction of backpressure by subhamReduction of backpressure by subham
Reduction of backpressure by subham
 
288_Muffler(1).pdf
288_Muffler(1).pdf288_Muffler(1).pdf
288_Muffler(1).pdf
 
B012130610
B012130610B012130610
B012130610
 
A Brief Review on Advance Acoustic Control System Process of Automotive Muffler
A Brief Review on Advance Acoustic Control System Process of Automotive MufflerA Brief Review on Advance Acoustic Control System Process of Automotive Muffler
A Brief Review on Advance Acoustic Control System Process of Automotive Muffler
 
Aqua silencer final report
Aqua silencer final reportAqua silencer final report
Aqua silencer final report
 
Diffuser in Steam Vent Silencer By Using Computational Fluid Dynamics
Diffuser in Steam Vent Silencer By Using Computational Fluid DynamicsDiffuser in Steam Vent Silencer By Using Computational Fluid Dynamics
Diffuser in Steam Vent Silencer By Using Computational Fluid Dynamics
 
Project.pptx
Project.pptxProject.pptx
Project.pptx
 
Vibration Analysis of an Automotive Silencer for Reduced Incidence of Failure
Vibration Analysis of an Automotive Silencer for Reduced Incidence of FailureVibration Analysis of an Automotive Silencer for Reduced Incidence of Failure
Vibration Analysis of an Automotive Silencer for Reduced Incidence of Failure
 
Suction Duct Optimization for Fume Extraction System
Suction Duct Optimization for Fume Extraction SystemSuction Duct Optimization for Fume Extraction System
Suction Duct Optimization for Fume Extraction System
 
Design and Fabrication of Aqua Silencer for Emission Control as well as Noise...
Design and Fabrication of Aqua Silencer for Emission Control as well as Noise...Design and Fabrication of Aqua Silencer for Emission Control as well as Noise...
Design and Fabrication of Aqua Silencer for Emission Control as well as Noise...
 
Ijmet 10 01_195
Ijmet 10 01_195Ijmet 10 01_195
Ijmet 10 01_195
 
IRJET - Review on Design of Intake Manifold for Air Restricted Engine
IRJET - Review on Design of Intake Manifold for Air Restricted EngineIRJET - Review on Design of Intake Manifold for Air Restricted Engine
IRJET - Review on Design of Intake Manifold for Air Restricted Engine
 
IRJET- Inquisitive Analytics of Diverse Exhaust System Contingent to Pollution
IRJET- Inquisitive Analytics of Diverse Exhaust System Contingent to PollutionIRJET- Inquisitive Analytics of Diverse Exhaust System Contingent to Pollution
IRJET- Inquisitive Analytics of Diverse Exhaust System Contingent to Pollution
 
M.E Thesis Presentation
M.E Thesis PresentationM.E Thesis Presentation
M.E Thesis Presentation
 
IRJET- Design and Fabrication of Aerodynamic Aqua Silencer
IRJET- Design and Fabrication of Aerodynamic Aqua SilencerIRJET- Design and Fabrication of Aerodynamic Aqua Silencer
IRJET- Design and Fabrication of Aerodynamic Aqua Silencer
 

Recently uploaded

CS 3251 Programming in c all unit notes pdf
CS 3251 Programming in c all unit notes pdfCS 3251 Programming in c all unit notes pdf
CS 3251 Programming in c all unit notes pdfBalamuruganV28
 
Gravity concentration_MI20612MI_________
Gravity concentration_MI20612MI_________Gravity concentration_MI20612MI_________
Gravity concentration_MI20612MI_________Romil Mishra
 
US Department of Education FAFSA Week of Action
US Department of Education FAFSA Week of ActionUS Department of Education FAFSA Week of Action
US Department of Education FAFSA Week of ActionMebane Rash
 
Input Output Management in Operating System
Input Output Management in Operating SystemInput Output Management in Operating System
Input Output Management in Operating SystemRashmi Bhat
 
2022 AWS DNA Hackathon 장애 대응 솔루션 jarvis.
2022 AWS DNA Hackathon 장애 대응 솔루션 jarvis.2022 AWS DNA Hackathon 장애 대응 솔루션 jarvis.
2022 AWS DNA Hackathon 장애 대응 솔루션 jarvis.elesangwon
 
Python Programming for basic beginners.pptx
Python Programming for basic beginners.pptxPython Programming for basic beginners.pptx
Python Programming for basic beginners.pptxmohitesoham12
 
Comparative study of High-rise Building Using ETABS,SAP200 and SAFE., SAFE an...
Comparative study of High-rise Building Using ETABS,SAP200 and SAFE., SAFE an...Comparative study of High-rise Building Using ETABS,SAP200 and SAFE., SAFE an...
Comparative study of High-rise Building Using ETABS,SAP200 and SAFE., SAFE an...Erbil Polytechnic University
 
Mine Environment II Lab_MI10448MI__________.pptx
Mine Environment II Lab_MI10448MI__________.pptxMine Environment II Lab_MI10448MI__________.pptx
Mine Environment II Lab_MI10448MI__________.pptxRomil Mishra
 
High Voltage Engineering- OVER VOLTAGES IN ELECTRICAL POWER SYSTEMS
High Voltage Engineering- OVER VOLTAGES IN ELECTRICAL POWER SYSTEMSHigh Voltage Engineering- OVER VOLTAGES IN ELECTRICAL POWER SYSTEMS
High Voltage Engineering- OVER VOLTAGES IN ELECTRICAL POWER SYSTEMSsandhya757531
 
70 POWER PLANT IAE V2500 technical training
70 POWER PLANT IAE V2500 technical training70 POWER PLANT IAE V2500 technical training
70 POWER PLANT IAE V2500 technical trainingGladiatorsKasper
 
ROBOETHICS-CCS345 ETHICS AND ARTIFICIAL INTELLIGENCE.ppt
ROBOETHICS-CCS345 ETHICS AND ARTIFICIAL INTELLIGENCE.pptROBOETHICS-CCS345 ETHICS AND ARTIFICIAL INTELLIGENCE.ppt
ROBOETHICS-CCS345 ETHICS AND ARTIFICIAL INTELLIGENCE.pptJohnWilliam111370
 
Theory of Machine Notes / Lecture Material .pdf
Theory of Machine Notes / Lecture Material .pdfTheory of Machine Notes / Lecture Material .pdf
Theory of Machine Notes / Lecture Material .pdfShreyas Pandit
 
Main Memory Management in Operating System
Main Memory Management in Operating SystemMain Memory Management in Operating System
Main Memory Management in Operating SystemRashmi Bhat
 
"Exploring the Essential Functions and Design Considerations of Spillways in ...
"Exploring the Essential Functions and Design Considerations of Spillways in ..."Exploring the Essential Functions and Design Considerations of Spillways in ...
"Exploring the Essential Functions and Design Considerations of Spillways in ...Erbil Polytechnic University
 
『澳洲文凭』买麦考瑞大学毕业证书成绩单办理澳洲Macquarie文凭学位证书
『澳洲文凭』买麦考瑞大学毕业证书成绩单办理澳洲Macquarie文凭学位证书『澳洲文凭』买麦考瑞大学毕业证书成绩单办理澳洲Macquarie文凭学位证书
『澳洲文凭』买麦考瑞大学毕业证书成绩单办理澳洲Macquarie文凭学位证书rnrncn29
 
Computer Graphics Introduction, Open GL, Line and Circle drawing algorithm
Computer Graphics Introduction, Open GL, Line and Circle drawing algorithmComputer Graphics Introduction, Open GL, Line and Circle drawing algorithm
Computer Graphics Introduction, Open GL, Line and Circle drawing algorithmDeepika Walanjkar
 
Katarzyna Lipka-Sidor - BIM School Course
Katarzyna Lipka-Sidor - BIM School CourseKatarzyna Lipka-Sidor - BIM School Course
Katarzyna Lipka-Sidor - BIM School Coursebim.edu.pl
 
Artificial Intelligence in Power System overview
Artificial Intelligence in Power System overviewArtificial Intelligence in Power System overview
Artificial Intelligence in Power System overviewsandhya757531
 
Cost estimation approach: FP to COCOMO scenario based question
Cost estimation approach: FP to COCOMO scenario based questionCost estimation approach: FP to COCOMO scenario based question
Cost estimation approach: FP to COCOMO scenario based questionSneha Padhiar
 
Prach: A Feature-Rich Platform Empowering the Autism Community
Prach: A Feature-Rich Platform Empowering the Autism CommunityPrach: A Feature-Rich Platform Empowering the Autism Community
Prach: A Feature-Rich Platform Empowering the Autism Communityprachaibot
 

Recently uploaded (20)

CS 3251 Programming in c all unit notes pdf
CS 3251 Programming in c all unit notes pdfCS 3251 Programming in c all unit notes pdf
CS 3251 Programming in c all unit notes pdf
 
Gravity concentration_MI20612MI_________
Gravity concentration_MI20612MI_________Gravity concentration_MI20612MI_________
Gravity concentration_MI20612MI_________
 
US Department of Education FAFSA Week of Action
US Department of Education FAFSA Week of ActionUS Department of Education FAFSA Week of Action
US Department of Education FAFSA Week of Action
 
Input Output Management in Operating System
Input Output Management in Operating SystemInput Output Management in Operating System
Input Output Management in Operating System
 
2022 AWS DNA Hackathon 장애 대응 솔루션 jarvis.
2022 AWS DNA Hackathon 장애 대응 솔루션 jarvis.2022 AWS DNA Hackathon 장애 대응 솔루션 jarvis.
2022 AWS DNA Hackathon 장애 대응 솔루션 jarvis.
 
Python Programming for basic beginners.pptx
Python Programming for basic beginners.pptxPython Programming for basic beginners.pptx
Python Programming for basic beginners.pptx
 
Comparative study of High-rise Building Using ETABS,SAP200 and SAFE., SAFE an...
Comparative study of High-rise Building Using ETABS,SAP200 and SAFE., SAFE an...Comparative study of High-rise Building Using ETABS,SAP200 and SAFE., SAFE an...
Comparative study of High-rise Building Using ETABS,SAP200 and SAFE., SAFE an...
 
Mine Environment II Lab_MI10448MI__________.pptx
Mine Environment II Lab_MI10448MI__________.pptxMine Environment II Lab_MI10448MI__________.pptx
Mine Environment II Lab_MI10448MI__________.pptx
 
High Voltage Engineering- OVER VOLTAGES IN ELECTRICAL POWER SYSTEMS
High Voltage Engineering- OVER VOLTAGES IN ELECTRICAL POWER SYSTEMSHigh Voltage Engineering- OVER VOLTAGES IN ELECTRICAL POWER SYSTEMS
High Voltage Engineering- OVER VOLTAGES IN ELECTRICAL POWER SYSTEMS
 
70 POWER PLANT IAE V2500 technical training
70 POWER PLANT IAE V2500 technical training70 POWER PLANT IAE V2500 technical training
70 POWER PLANT IAE V2500 technical training
 
ROBOETHICS-CCS345 ETHICS AND ARTIFICIAL INTELLIGENCE.ppt
ROBOETHICS-CCS345 ETHICS AND ARTIFICIAL INTELLIGENCE.pptROBOETHICS-CCS345 ETHICS AND ARTIFICIAL INTELLIGENCE.ppt
ROBOETHICS-CCS345 ETHICS AND ARTIFICIAL INTELLIGENCE.ppt
 
Theory of Machine Notes / Lecture Material .pdf
Theory of Machine Notes / Lecture Material .pdfTheory of Machine Notes / Lecture Material .pdf
Theory of Machine Notes / Lecture Material .pdf
 
Main Memory Management in Operating System
Main Memory Management in Operating SystemMain Memory Management in Operating System
Main Memory Management in Operating System
 
"Exploring the Essential Functions and Design Considerations of Spillways in ...
"Exploring the Essential Functions and Design Considerations of Spillways in ..."Exploring the Essential Functions and Design Considerations of Spillways in ...
"Exploring the Essential Functions and Design Considerations of Spillways in ...
 
『澳洲文凭』买麦考瑞大学毕业证书成绩单办理澳洲Macquarie文凭学位证书
『澳洲文凭』买麦考瑞大学毕业证书成绩单办理澳洲Macquarie文凭学位证书『澳洲文凭』买麦考瑞大学毕业证书成绩单办理澳洲Macquarie文凭学位证书
『澳洲文凭』买麦考瑞大学毕业证书成绩单办理澳洲Macquarie文凭学位证书
 
Computer Graphics Introduction, Open GL, Line and Circle drawing algorithm
Computer Graphics Introduction, Open GL, Line and Circle drawing algorithmComputer Graphics Introduction, Open GL, Line and Circle drawing algorithm
Computer Graphics Introduction, Open GL, Line and Circle drawing algorithm
 
Katarzyna Lipka-Sidor - BIM School Course
Katarzyna Lipka-Sidor - BIM School CourseKatarzyna Lipka-Sidor - BIM School Course
Katarzyna Lipka-Sidor - BIM School Course
 
Artificial Intelligence in Power System overview
Artificial Intelligence in Power System overviewArtificial Intelligence in Power System overview
Artificial Intelligence in Power System overview
 
Cost estimation approach: FP to COCOMO scenario based question
Cost estimation approach: FP to COCOMO scenario based questionCost estimation approach: FP to COCOMO scenario based question
Cost estimation approach: FP to COCOMO scenario based question
 
Prach: A Feature-Rich Platform Empowering the Autism Community
Prach: A Feature-Rich Platform Empowering the Autism CommunityPrach: A Feature-Rich Platform Empowering the Autism Community
Prach: A Feature-Rich Platform Empowering the Autism Community
 

Reactive muffler

  • 1. A Research Paper “Overview of Reactive Muffler” Submitted To: Dr. Colin Novak Submitted By: Devarsh Patel (104861000) Bandhav Fadia (104817821) AUTO APPS FOR NOISE/ VIBRATION/ HARSHNESS (06-85-525-01)
  • 2. CONTENTS  Introduction  Reactive muffler Geometric Design  The Reactive muffler design considerations  Helmholtz Resonator  Case study on LCV Diesel engine vehicle  Corrosion Effect on reactive muffler  Conclusion  References
  • 3. INTRODUCTION Automobile Noise Sound & Vibration Noise Reductiuon Noise is characterized as undesirable sound. Engine exhaust noise is one of the major concern of every automobile company Motivation behind a Reactive muffler is to decrease vehicle exhaust noise
  • 4. Reactive muffler Geometric Design Figure 1: Geometric design of reactive muffler The geometrical shape of reactive muffler consists of numerous chambers, flow diffusers, tuned resonated cylinders, and discharge tube connected with the outlet connection pipe
  • 5. The Reactive muffler design considerations 1. Acoustical consideration: Insertion loss Transmission loss • It is defined as the difference between the acoustic power radiated without and with a muffler fitted. • It is defined as the difference (in decibels) between the sound power incidents at the entry to the muffler to that transmitted by the muffler.
  • 6. The Reactive muffler design considerations 2. Aero dynamic consideration with backpressure: • Aerodynamic consideration specifies the flow of exhaust gases from muffler to create less pressure in muffler. • The extra static pressure generated by the muffler on the vehicle engine through restriction in flow of exhaust fumes to achieve higher noise reduction may result in higher backpressure to the engine. Figure 2: Aerodynamic flow diagram of reactive muffler
  • 7. The Reactive muffler design considerations 3. Mechanical consideration: 4. Economical consideration: • Mechanical considerations are taken for material selection, which decide muffler’s durability • The material properties of exhaust required for the hot section include good strength for high temperature, thermal fatigue properties, oxidation and salt corrosive resistance. • Majorly two types of materials used in manufacturing the reactive muffler which include Stainless steel and the Aluminum • Muffler must have to be less expensive with consideration of design cost, material cost and fabrication cost • The performance of muffler may matter by its cost
  • 8. Helmholtz Resonator • It is used in car exhausts to alter the sound of the exhaust note and for differences in power delivery by adding chambers to the exhaust muffler • Exhaust resonators are also used to reduce potentially loud and obnoxious engine noise • The waves reflected by the resonator helps to cancel out certain frequencies of sound in the exhaust. Figure 3: Helmholtz resonator in muffler chamber
  • 9. Case study on LCV Reactive muffler Shital S., Saisankaranarayana K, Kalyankumar S. and Prof. Thombare performed Experiment on low commercial vehicle diesel engine vehicle. Designed Reactive muffler by deciding a target of required transmission loss.
  • 10. Case study on LCV Reactive muffler Targeted data: Bore Diameter (D) 80 mm Stroke Length (L) 98 mm No. of cylinder (n) 3 Engine Power (P) 65 hp Maximum RPM (N) 3500 rpm Targeted transmission loss (dB) 30 dB Engine Input data: Target Frequencies Cylinder Firing Rate: CFR = Engine max speed/120 for 4 stroke engine CFR = 3500/120 = 29.17 Hz Engine Firing Rate: EFR= No. of cylinder * CFR EFR= 3*29.17 = 87.50 Hz Engine- Benchmarking Data Muffler Volume calculation Volume of muffler (Vm) = Vf × [ 𝜋 4 ×D2x 𝐿] × 𝑁 2 Volume factor is taken as 16 So, Volume of muffler (Vm) = 11.83 Lit
  • 11. Case study on LCV Reactive muffler Virtual Simulation CFD analysis: There will have steady pressure drop which is related to flow and geometry of air passages by supplying steady air flow through mufflers. Pressure drop in muffler is important tool for the design and development of mufflers. All three concept of muffler are tested for flow analysis using CFD simulation tool (a): Concept 0A (b): Concept 0B (c): Concept 0C Figure CFD Model of Concept 0A, 0B, 0C
  • 12. Case study on LCV Reactive muffler Virtual analysis: The mean flow performance of the three mufflers considered in the acoustic analysis has been assessed. Frequency range for this case study is taken in 10-2000 Hz. Reflection on inlet and outlet end cover is neglected From the virtual analysis of transmission loss it can see that concept 0A is having better transmission loss compared to other concept 0B and 0C in initial frequency range 20 Hz to 600 Hz. As well as in mid frequency range of 1000 Hz to 1400 Hz.
  • 13. Case study on LCV Reactive muffler Prototype manufacturing and experimental testing: Some important factors have to take care such as there should not be any gas leakage The experimental determination of backpressure on engine and transmission loss. The prototypes of all concepts that are made at the above step are tested for the transmission loss to verify the target value. All three concept muffler tested on engine for evaluate back pressure measurement.
  • 14. Case study on LCV Reactive muffler As per the results received from FFT analyser transmission loss v/s frequency schematic diagram is plot for all three different mechanical exhaust concept models. Transmission loss is calculated between 10 dB to 60 dB to frequency range. From the experimental frequency and transmission loss plot, it has been observe that concept 0A is having higher transmission loss in same initial frequency range 20 to 600 Hz. By comparing virtual analysis and prototype experimental results, best concept muffler is identified, also for back pressure CFD results are compared with engine back pressure results. Based on this compression concept 0A selected
  • 15. Corrosion effect on Reactive muffler The main drawback of reactive muffler is corrosion, which is happen due to exhaust gas condensate In general practice it is seen that the corrosion problem is mostly observed at a time of short distance driving, when the temperature does not go high and wet corrosion start due to condensation mainly in the muffler at the cold end becomes the major factor of failure Corrosion failures may cause perforation of components causing exhaust leaks in internal components that may result in noise issues due to change in muffler acoustics and can also result in pollution causing damage to environment. Types of corrosion in muffler: • Condensate Pitting corrosion • Exterior Salt pitting • Crevice corrosion • Oxidation • Galvanic corrosion
  • 16. Corrosion effect on Reactive muffler
  • 17. Conclusion • This paper emphasizes the importance of the reactive muffler through various consideration for vehicle noise including their characteristics starting from the design to proto manufacturing and validation of exhaust muffler. • The measuring cycle which described in this paper though one case study could provide the noise and pressure determinations, within the particular design models made with artificial softwares within specific limitation. • Practical approach from the concept design to prototype model and validation of exhaust muffler. This design methodology will help to understand the importance of each step of design from concept level to validation level. Numbers of attempt, product development time and cost can save by this practical approach.
  • 18. References 1. Kuppm P. K. R., Shahab F., & Amiya R. M. (2018). A new sound quality metric for the design of engine exhaust mufflers. Journal of Automobile Engineering, 232(2), 254-263. 2. Krishnal B., Prof. R.S., & Prof. P.K.S. (2015). Vibration analysis of an Automotive silencer for reduced incidence of failure. International Journal of Engineering and Technical Research, 2321-0869, 79-84. 3. Potente, D. (2005). General Design Principles for an Automotive Muffler. Australian Acoustical Society, 9-11, 153-157. 4. Nitinkumar A., Kalpana G., Shrikant N., & Santosh S. (2015). Vibration and Noise in Reactive Muffler: A Study. Advances in Mechanical Engineering Techniques, 12-13,1-5 5. Shital S., Saisankaranarayana K., Kalyankumar S.H., Prof. D.G.T. (2010). A Practical Approach towards Muffler Design, Development and Prototype Validation. SAE International, 032-0021, 1-16. 6. Krunal C.C., Prof. R.Y.P., Prof. N.R.S., & Prof. S.J.C. (2016). Investigation of Geometrical Parameter on Performance of Muffler Using CFD Analysis. International Research Journal of Engineering and Technology, 2395-0056, 1332-1338. 7. M. H.N., Z. A.K., A. S., & K. S. (2016). A predictive model for life assessment of automotive exhaust mufflers subject to internal corrosion failure due to exhaust gas condensation. Engineering failure Analysis, 63, 43-60.