Acoustics Performance Optimization for Mufflers Based on GT-Power and Fluent

作者：Wu, Jie; Wang, Mingliang

来源：Journal of South China University of Technology(Natural Science Edition), 2018, 46(6): 81-86.

DOI：10.3969/j.issn.1000-565X.2018.06.011

• Flow field analysis
• Fluent
• Gt-power
• Interior flow field
• Performance optimizations
• Sound pressure level
• Structural imperfections
• Technical requirement

The tailpipe idle noise of a new car model severely exceeds the manufacture's limits. The reason of inadequate low-frequency anechoic performance and structural imperfection are obtained by analyzing the transmission loss of the muffler and the muffler's interior flow field. The front muffler is optimized by using the cross-flow perforation structure and the main muffler's perforation form is improved. GT-Power simulation and test results show that low-frequency anechoic performance of the muffler is improved, and the tailpipe idle noise decreases by more than 4dB(A) and 3dB(A) respectively at AC off and AC on cases. The total tailpipe sound pressure levels and the back pressure of the exhaust system at the 3WOT case satisfy the manufacture's technical requirements.

• 出版日期2018-6-1
• 单位华南理工大学