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PROCEEDINGS OF THE TENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING
Edited by: B.H.V. Topping
The Isolation Efficiency of the Dual-Trench System in a Three Dimensional Wave Propagation Problem
S.H. Tung+, C.C. Yu+, W.H. Lee+ and M.H. Shih*
+Department of Civil and Environmental Engineering, National University of Kaohsiung, Kaohsiung, Taiwan
S.H. Tung, C.C. Yu, W.H. Lee, M.H. Shih, "The Isolation Efficiency of the Dual-Trench System in a Three Dimensional Wave Propagation Problem", in B.H.V. Topping, (Editor), "Proceedings of the Tenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 210, 2005. doi:10.4203/ccp.81.210
Keywords: vibration reduction, trench, boundary element method, three-dimensional wave propagation.
The isolation or reduction of the vibration induced by machine and high speed railways has received extensive discussion [3,4,5,6,7,8,9,10,11] in recent years. Three major solutions are trenches, springs with dampers and the impediment of waves. Because the construction of a trench is simpler than the other two, it receives more attention [4,5,6,7,8,9,10]. Much research is carried out on two-dimensional systems without considering the real effect of the three-dimensional wave propagation.
There is much research on vibration isolation using a single trench. A previous study  indicates that the isolation efficiency of a trench varies with the fill material. The trench with stiffer material has better isolation efficiency in a low frequency case and the empty trench has better isolation efficiency in a high frequency case. In the present analysis, the efficiency of a combination isolation system of two parallel trenches is evaluated with the aid of the boundary element method [1,2].
The efficiency of the vibration isolation of a dual-trench system is investigated in the present analysis. Three different dual-trench systems, the open-open, open-infilled, and infilled-infilled combinations are studied. The research results are shown in Figure 210.1, which show that the system with open-open or infilled-infilled trenches have the similar efficiency to that of a single open or single infilled trench. The combination system of open-infilled trenches is an ideal isolator in both low and high frequency cases.
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