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Optimization of Resonator’s Acoustic Performance in the Muffler Set

Asadi, Alireza | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53232 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Khodaygan, Saeed
  7. Abstract:
  8. Noise pollution is one of the major issues in automative industry. Many of these noises are caused by the internal combustion engine. Using reactive mufflers in the car's exhaust path can effectively reduce this annoying noises. Imposed pressure drop caused by installation this mufflers must be within an acceptable range for the car engine. Resonators, despite having a much lower pressure drop than other components of the exhaust system, can be used to cover the weaknesses of the muffler in the acoustic performance of the noise reduction set. One of the most common methods for designing a resonator is to use perforated plates. In this study the effect of various geometric parameters of a commercial vehicle’s resonator such as plate porosity, baffle distance and tank volume on its acoustic performance is investigated. And according to the specifications of noise source and noise receiver (human ear) The acoustic performance of this resonator is optimized. The aim of this study is to cover the weaknesses of muffler in the specific car and investigation the effect of changes in backpressure of the engine. Finally, with the applied changes, the performance of the noise reduction set has become more uniform at different frequencies, and transmission loss of resonator in the expected frequency ranges has increased by an average of 12 dB, and pressure drop has decreased by 17 Pa
  9. Keywords:
  10. Muffler ; Pressure Drop ; Acoustics ; Resonator ; Transmission Loss Allocation ; Perforated Plate ; Noise Reduction ; Acoustic Emission

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