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Acoustic Simulation of Mufflers with Multiple Perforated Tubes
HE Yan-song;LI Jing;LU Hui-chao
   2012, 32 (2): 151-154.   DOI: 10.3969/j.issn.1006-1355-2012.02.037
Abstract （1584）            Save
Based on acoustic FEM, the transmission losses of three mufflers with different combinations of perforated tubes were computed. The influences of the perforation porosities of the tubes on the transmission losses of the mufflers were discussed. Then, the acoustic performance of a complicated muffler with multiple perforated tubes was stimulated. The result shows that the transmission loss of the muffler is low when the noise frequency is below 1 000 Hz. This work provides a reference for further improvement of the muffler.
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《Evaluation Method of Human Body Response to Vibration》
ZHANG Zhi-fei;XU Zhong-ming;HE Yan-song;WANG Xian-Guo;XIE De-yun
   2010, 30 (2): 149-155.   DOI: 10.3969/j.issn.1006-1355.2010.02.149
Abstract （2551）      PDF（pc） （2647KB）（2337）       Save
Several international evaluation methods of vibration, ISO26311985, ISO26311997，BS68411987 and Absorbed Power, are introduced in detail, and their characters are summarized. The present status of research on evaluation methods of vibration is analyzed, and the present status of research on human response characteristics to vibration is summarized. It is shown that the human response to vibration is very complicated and influenced by human posture, human weight and vibration magnitude etc. So, searching for more suitable and scientific evaluation methods may become a hot research focus is the area of vibration evaluation. According to domestic research in this area, some suggestions are presented, such as updating the national standards, measuring the human response to vibration and carrying out fundamental research etc., in order to establish an evaluation method of vibration which is suitable to our Chinese.
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