Effect Factors Analysis of Flow Generation Noise from Muffler Element with Inserted Tube

Abstract:

Using orthogonal experimental design method structure parameters of work piece for muffler element with inserted tube are determined. Flow noise regeneration of them is measured on the self development test bench. Relationship model on total sound power of flow regeneration noise and structure parameter and flow velocity is established utilizing Multiple linear regression method, model parameters are solved making use of hyper static least square method. Significance test of the model is performed, the law of total sound power level for muffler element flow regeneration noise changing with the parameters is discussed. Result shows that the established models is all highly significant under 0.01 levels, and inserted length of outlet tube and inn-diameter of inlet tube have higher effect on the flow generation noise, and decreasing the inserted length and the inn-diameter are in favor of reducing flow generation noise. But inserted length of inlet tube and expansion ratio have little effect on the flow generation noise.

• Periodical: Advanced Materials Research (Volumes 605-607)
• Pages: 1149-1153
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.605-607.1149
• Online since: December 2012
• Authors: Hai Jun Zhao, Hai Xia Wang, Jia Dong Chang, Qi Li, Li Ping Tian
• Keywords: Effect Factor, Flow Noise Regeneration, Inserted Tube, Muffler

References

[1] Rolf Jebasinski, Sascha Leng, Marco Jess et al. Investigation on whistle noise in automotive exhaust system mufflers[R]. SAE Paper, No2005012361, (2005).

DOI: 10.4271/2005-01-2361

[2] A.J. Torregrosa, A. Broatch, H. Climent, I. Andre, A note on the Strouhal number dependence of the relative importance of internal and external flow noise sources in IC engine exhaust systems [J]. Journal of Sound and Vibration 282 (2005).

DOI: 10.1016/j.jsv.2004.05.017

[3] Seong-Hyun Lee1, Jeong-Guon Ih. Effect of non-uniform perforation in the long concentric resonator on transmission loss and back pressure. Journal of Sound and Vibration 311 (2008) 280-296.

DOI: 10.1016/j.jsv.2007.09.005

[4] Rolf Jebasinski, Sascha Leng, Marco Jess et al. Investigation on whistle noise in automotive exhaust system mufflers[C]. 2005 SAE, 2005-01-2361.

DOI: 10.4271/2005-01-2361

[5] G.B. Ashcroft, K. Takeda, X. Zhang. A numerical investigation of the noise radiated by a turbulent flow over a cavity[J]. Journal of Sound and Vibration 265 (2003) 43–60.

DOI: 10.1016/s0022-460x(02)01439-6

[6] Deng Z-x, Zhao H-j, Zhao S-j, Li P-r. Producing mechanism of flow noise generation from perforated duct muffler element, Transactions CSICE, 5, 27 (2009).