Journal of Vibration and Sound

Journal of Vibration and Sound

Investigating the effect of changing the outlet position on the insertion loss in mufflers

Document Type : research article

Authors
1 Imam Hossein Comprehensive University
2 Department of Mechanical Engineering Imam Hossein Comprehensive University
Abstract
Noise pollution in machinery has always been a pervasive challenge in the industry. One of the noise-generating devices in industries is internal combustion engines. To mitigate the noise pollution produced by these engines, mufflers are used. Among the most common types of mufflers are expansion mufflers. By altering the geometry and repositioning the outlet pipe in expansion mufflers, the transmission loss can be increased. Side outlet mufflers can achieve greater effectiveness compared to conventional expansion mufflers of similar dimensions. In this research, the transmission loss for both a conventional muffler and a side outlet muffler was first calculated through analytical solutions and simulations using COMSOL software. Subsequently, these results were compared with an experimental study and validated for accuracy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Keywords
Subjects

[1]  Kalita, Ujjal, and Manpreet Singh. "Acoustic performance analysis of muffler by varying sound absorption materials." Materials Today: Proceedings (2023).
[2]  Huang, Peiyan, Pei Wu, He Su, Jing Xue, Haijun Zhang, Yongan Zhang, and Yuchen Guo. "Research on the Acoustic Attenuation Performance and Optimization of Split-Stream Rushing Exhaust Mufflers in the Presence of Acoustic–Structure Coupling Effects." Applied Sciences 15, no. 9 (2025): 4722.
[3]  Wu, Can, Lei Chen, Jing Ni, and Jing Xu. "Modeling and experimental verification of a new muffler based on the theory of quarter-wavelength tube and the Helmholtz muffler." SpringerPlus 5, no. 1 (2016): 1366.
[4]  Zhang, Liang, He-Mu Shi, Xiao-Hui Zeng, and Zhuo Zhuang. "Theoretical and experimental study on the transmission loss of a side outlet muffler." Shock and Vibration 2020, no. 1 (2020): 6927574.
[5]  Chivate, Shubham, Pravin Hujare, Rajesh Askhedkar, Deepak Hujare, and Satish Chinchanikar. "A review on acoustic performance analysis of reactive muffler." Materials Today: Proceedings 63 (2022): 613-622.
[6]  Sedighi, "The effect of muffler design on reducing the noise pollution," 2024.
[7]  Labao, Kai, Nicholas Middleton, and John Nuszkowski. Design of a Reactive-Style Muffler for a Formula SAE Race Car. No. 2025-01-0024. SAE Technical Paper, 2025.
[8]  Othman, Nor'Azizi, and Nurul Ashmira Abdul Rahman. "The Effects of Acoustic Absorbing Materials in Noise Reduction of Exhaust Muffler System." Journal of Advanced Research Design 76, no. 1 (2021): 1-13.
[9]  Pratama, Muhammad Yandi, Prihanto Trihutomo, and Suprayitno Suprayitno. "Muffler Design for Noise Reduction and Pressure Loss Optimization Using Multiobjective Genetic Algorithm." Engineering Innovations 11 (2024): 63-68.
[10]      Rafique, Faisal, Jiu Hui Wu, Chong Rui Liu, and Fuyin Ma. "Transmission Loss analysis of a simple expansion chamber muffler with extended inlet and outlet combined with inhomogeneous micro-perforated panel (iMPP)." Applied Acoustics 194 (2022): 108808.
[11]      Oh, Kee Seung, Hayoung Chung, and Joo Hwan Oh. "Topology Optimization Using Reinforcement Learning for Designing the Inside Layout of a Muffler." Available at SSRN 4953398 (2024).
[12]      Gavit, Riziyamaalisa, and Kiran Wani. "Muffler transmission loss optimization for a vehicle using genetic algorithm." In Smart Sensors Measurement and Instrumentation: Select Proceedings of CISCON 2021, pp. 1-17. Singapore: Springer Nature Singapore, 2023.
[13]      Tan, Wei-Hong, and Zaidi Mohd Ripin. "Analysis of exhaust muffler with micro-perforated panel." Journal of Vibroengineering 15, no. 2 (2013): 558-573.
[14]      Ambavane, Sahil S., Vinayak C. Achari, Mrunal R. Khandebharad, and Pratik A. Kulkarni. "Design and thermal analysis of vehicle exhaust muffler." IRJET 8, no. 12 (2021): 19-25.
[15]      Bugaru, Mihai, and Cosmin-Marius Vasile. "Recent Developments in Using a Modified Transfer Matrix Method for an Automotive Exhaust Muffler Design Based on Computation Fluid Dynamics in 3D." Computation 12, no. 4 (2024): 73.
[16]      Munjal, M. L., and K. M. Kumar. "State of the art of rational design of efficient mufflers." Noise Control Engineering Journal 71, no. 3 (2023): 169-179.
[17]      Kalita, Ujjal, and Manpreet Singh. "Prediction of transmission loss on a simple expansion chamber muffler." J. Emerg. Technol. Innov. Res 5 (2018): 1022-1031.
[18]      Yimer, Ali Mohammed, and Ramesh Babu Nallamothu. "Reduction of the noise from the engine, modification of reactive muffler and performance analysis." Discover Applied Sciences 7, no. 8 (2025): 849.
[19]      Kalita, Ujjal, and Manpreet Singh. "Optimization of a reactive muffler used in four-cylinder petrol engine into hybrid muffler by using CFD analysis." Materials Today: Proceedings 50 (2022): 1936-1945.
[20]      Hu, Zhongxun, Lilv Pang, Linling Zhou, Peng Li, and Jun Lu. "Design of Noise Reduction Structure of Porous Muffler Based on Ant Colony Algorithm." In International Conference on Innovative Computing, pp. 1-9. Singapore: Springer Nature Singapore, 2024.
[21]      Saadabadi, Mehran, Mahdieh Samimi, and Hassan Hosseinlaghab. "Organized Computational Measurement to Design a High-Performance Muffler." Metrology 3, no. 3 (2023): 254-279.
[22]      Faizen, M., S. Ameen, A. Pandey, and D. S. Das. "Review of Muffler Performance by changing design parameters." International Journal of Research and Analytical Reviews 6, no. 2 (2019): 2349-5138.
[23]      Pratama, Muhammad Yandi. "Multiobjective Optimization of Three-Pass Perforated Muffler Design for Improved Acoustic Performance and Reduced Fluid Pressure Drop Using Genetic Algorithms." International Journal of Automotive & Mechanical Engineering 22, no. 1 (2025).
[24]      Rao, P. Chinna, B. Madhava Varma, and L. V. V. G. Rao. "Muffler design, development and validation methods." Int. J. Innov. Res. Sci. Eng. Technol 5 (2016): 8626-8639.
[25]      Moein, Hossein, Mohammad Passandideh Fard, and Ali Faezian. "Experimental and numerical investigation of transmission loss in a zero-flow silencer." Amirkabir Journal of Mechanical Engineering 56, no. 3 (2024): 411-438.