For the acoustic attenuation performance analysis of double-chamber silencers, the coupling method based on substructure is proposed. The basic idea is that: the silencer is divided into several substructures according to the geometry characteristics and material characteristics. Applying the 3-D analytical method or numerical mode matching method to calculate the transfer matrixes of the substructures with regular cross-section, and using the 3-D numerical method for the substructures with irregular cross-section. The integer transfer matrix of the silencer is solved by combining with the continuity conditions at the interfaces of the substructures, and the transmission loss is derived. The transmission loss of the several typical double-chamber silencers are calculated by using the proposed coupling method, the finite element method and the numerical mode matching method, respectively, and the results show that the coupling method based on the substructures is applicable for the double-chamber silencers, and more efficient than numerical mode matching method.
Key words
silencer /
acoustic attenuation characteristics /
coupling method /
numerical mode matching method
{{custom_keyword}} /
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
References
[1] Kirby R. Transmission loss predictions for dissipative silencers of arbitrary cross section in the presence of mean flow[J]. Journal of the Acoustical Society of America,2003,114 (1): 200-209.
[2] Albelda J, Denia F D, Torres M I,et al. A transversal substructuring mode matching method applied to the acoustic analysis of dissipative silencers[J]. Journal of Sound and Vibration,2007, 303: 614-631.
[3] Albelda J, Denia F D, Fuenmayor F J,et al. A transversal substructuring modal method for the acoustic analysis of dissipative mufflers with mean flow[C]. Acoustics’08 Paris, 2008.
[4] Kirby R. A comparison between analytical and numerical methods for modeling automotive dissipative silencer with mean flow[J].Journal of Sound and Vibration,2009, 325: 565-582.
[5] Fang Z, Ji Z L. Acoustic attenuation analysis of expansion chambers with extended inlet/outlet [J]. Noise Control Engineering Journal, 2013, 61(2):240-249.
[6] Fang Z, Ji Z L. Numerical mode matching approach for acoustic attenuation predictions of double-chamber perforated tube dissipative silencers with mean flow [J]. Journal of Computational Acoustics,2014,22(2): 1450004-1-1450004-15.
[7] 方智,季振林.穿孔管阻性消声器横向模态和声学特性计算与分析[J]. 振动与冲击, 2014, 33 (7):138-146.
FANG Zhi, JI Zhen-lin. Transversal modes and acoustic attenuation performance of a perforated tube dissipative silencer[J]. Journal of Vibration and Shock, 2014, 33(7): 138-146.
[8] 张盛,方杰,张洪武,等.基于多重多级动力子结构的Lanczos算法[J].振动与冲击,2012,31(6): 23-26.
ZHANG Sheng,FANG Jie,ZHANG Hong-wu,et al. Lanczos algorithm based on multi-level dynamic substructures[J]. Journal of Vibration and Shock, 2012, 31(6): 23-26.
[9] 周储伟,潘清. 模拟裂纹扩展的一种有限元局部动态子划分方法[J].计算力学学报,2012, 29(4): 499-504.
ZHOU Chu-wei,PAN Qing. A dynamic sub-partition strategy of finite element for simulation of crack propagation[J].Chinese Journal of Computational Mechanics, 2012, 29(4): 499-504.
[10] Munjal M L. Acoustics of ducts and mufflers[M]. New York:Wiley-Interscience, 1987.
[11] Ingard U. On the theory and design of acoustic resonators [J]. Journal of the Acoustical Society of America,1953, 25: 1037-1061.
[12] 徐贝贝,季振林. 穿孔管阻性消声器声学特性的有限元分析[J].振动与冲击,2010, 29(3): 58-62.
XU Bei-bei, JI Zhen-lin. Finite element analysis of acoustic attenuation performance of perforated tube dissipative silencers[J].Journal of Vibration and Shock, 2010, 29(3): 58-62.
[13] 康钟绪. 消声器及穿孔元件声学特性分析[D]. 哈尔滨:哈尔滨工程大学,2009.
[14] Easwavan V, Munjal M L. Plane wave analysis of conical and exponential pipes with incompressible mean flow [J]. Journal of Sound and Vibration, 1992, 152(1): 73-93.
{{custom_fnGroup.title_en}}
Footnotes
{{custom_fn.content}}
PDF(1492 KB)
