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<p>This study focuses on reducing engine noise and improving the acoustic performance of a reactive muffler through structural modifications. A comparative analysis was conducted between the existing muffler and two newly designed models to evaluate their effectiveness in noise attenuation while maintaining optimal backpressure. The muffler models were developed using AutoCAD, and their acoustic and flow performance was analyzed using COMSOL Multiphysics simulations. The modifications primarily involved changes in internal pipe arrangements and expansion chamber configurations to enhance sound wave reflection and cancellation. Transmission loss predictions were carried out for all models, and the one with the highest noise reduction capability was selected. The simulation results indicated that the second modified model achieved an average increase of 11.1&#xa0;dB in transmission loss compared to the existing muffler, with only a slight rise in backpressure. These findings confirm that strategic modifications to the muffler’s internal geometry can significantly improve noise reduction while ensuring efficient engine performance. This research provides a practical approach to optimizing reactive muffler designs for improved acoustic efficiency in automotive applications.</p>

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Reduction of the noise from the engine, modification of reactive muffler and performance analysis

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年7月30日

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  • Ali Mohammed Yimer,
  • Ramesh Babu Nallamothu

摘要

This study focuses on reducing engine noise and improving the acoustic performance of a reactive muffler through structural modifications. A comparative analysis was conducted between the existing muffler and two newly designed models to evaluate their effectiveness in noise attenuation while maintaining optimal backpressure. The muffler models were developed using AutoCAD, and their acoustic and flow performance was analyzed using COMSOL Multiphysics simulations. The modifications primarily involved changes in internal pipe arrangements and expansion chamber configurations to enhance sound wave reflection and cancellation. Transmission loss predictions were carried out for all models, and the one with the highest noise reduction capability was selected. The simulation results indicated that the second modified model achieved an average increase of 11.1 dB in transmission loss compared to the existing muffler, with only a slight rise in backpressure. These findings confirm that strategic modifications to the muffler’s internal geometry can significantly improve noise reduction while ensuring efficient engine performance. This research provides a practical approach to optimizing reactive muffler designs for improved acoustic efficiency in automotive applications.