Approach to Structure-Borne Sound Propagation in Grillage by Stress Wave Finite Element Method

• Main Authors: Shih Chi ,Liu, 劉詩麒
• Other Authors: W. H. Wang
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/06046791031959508250

碩士 === 國立海洋大學 === 系統工程暨造船學系 === 90 === To solve the finite element method in the high frequency vibration of general structure that faces sizes of element of grid problems, our research has developed another new element that derives stress wave individually from a confined beam of vibration mode and compiles a matrix type. Without any limitation on sizes of grid, the advantage of new element can remain theoretical mode basically and does not restrict the range of frequency. Furthermore, under the structure of finite element method, it has developed a grillage mode of program to calculate any beam cross section. From our research, it has been constructed a 1m beam model, 1m by 1m orthogonal L Type of grillage truss model, and different cross section of long beam model with a stringer of cabin deck, and it also has used the ANSYS finite element of package software to verify its correctness. To make the program that has capable of excellent practicability and use the beam element simulation on the ten-floor steel concrete-building model, it has applied different loads to analyze each node and transmission mobility relationship, and it also has used supporting structure to stimulate its dashpot effect. From the ANSYS package verification, our research in the development of stress wave of finite element method is applicable and in the analysis of grillage structure-borne sound propagation that has quite accuracy, convenient, and effective. In addition, when it has faced a large size structure or high vibration analysis, it can reduce grid sizes of element and solve computer computation that often occurs lack of RAM capacity and tardy problem.