排灌机械工程学报
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Journal of Drainage and Irrigation Machinery Engin  2013, Vol. 31 Issue (2): 142-145    DOI: 10.3969/j.issn.1674-8530.2013.02.011
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Analysis on characteristics of new muffler for marine pipelines
 XU  Wei-Wei, WU  Da-Zhuan, WANG  Le-Qin, HAO  Zong-Rui
(1.Institute of Chemical Machinery Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China; 2.Institute of Oceanographic Instrumentation, Shandong Academy of Science, Qingdao, Shandong 266001, China)
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Abstract In order to reduce pipelineradiated noise and fluid pulsation, a new muffler was designed and developed. Through experiments and simulations, the performance of the new muffler was evaluated. Its transmission losses was calculated by onedimensional model and 3D finite element model. The radiated noise at the pipe mouth before and after the installation of the muffler was measured by a hydrophone and compared. Fluidsolid coupling finite element software Adina was used to evaluate the muffler′s capacity of reducing pulsation. The results show that the onedimensional calculation model is in agreement with 3D finite element model in predicting the transmission loss of the muffler. The pipelineradiated noise is chiefly related to the cycle noise of the motion system of the pipeline and the fluid pulsation rate. Therefore, to reduce fluid pulsation can also reduce the pipelineradiated noise at the pipeline mouth. The muffler reduce radiated noise caused by some special frequencies significantly, the sound pressure level was reduced to 3.5 dB for the one third octave at 6 000 Hz. Elastomers added to the inner side of the muffler will couple the fluid and the elastomers, which is helpful in improving the fluid pulsation. When the fluid pulsation rate is 250 Hz and the elasticity coefficient of elastomer is 267 MPa, the amplitude of the fluid pulsation can be reduced up to 70% .
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Articles by authors
XU Wei-Wei
WU Da-Zhuan
WANG Le-Qin
HAO Zong-Rui
Key wordsmuffler   fluid pulsation   pipeline radiated noise   experiment   numerical simulation     
Received: 2012-06-11; Published: 2013-02-28
Cite this article:   
XU Wei-Wei,WU Da-Zhuan,WANG Le-Qin et al. Analysis on characteristics of new muffler for marine pipelines[J]. Journal of Drainage and Irrigation Machinery Engin, 2013, 31(2): 142-145.
 
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