scholarly journals Low-Frequency Acoustic-Structure Analysis Using Coupled FEM-BEM Method

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Jinlong Feng ◽  
Xiaoping Zheng ◽  
Haitao Wang ◽  
HongTao Wang ◽  
Yuanjie Zou ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
High Efficiency ◽  
Low Frequency ◽  
Structural Domain ◽  
Coupled Problems ◽  
Equilibrium Conditions ◽  
Acoustic Structure ◽  
Acoustic Domain ◽  
Element Method

A numerical algorithm based on finite element method (FEM) and boundary element method (BEM) is proposed for the analyses of acoustic-structure coupled problems. By this algorithm, the structural domain and the acoustic domain are modelled by FEM and BEM, respectively, which are coupled with each other through the consideration of the appropriate compatibility and equilibrium conditions on the interface of the two domains. To improve the computational efficiency, the adaptive cross approximation (ACA) approach is incorporated into the proposed algorithm to deal with the nonsymmetric and fully populated matrices resulting from the coupling of the FEM and BEM. The validity and the high efficiency of the present approach are demonstrated by two examples.

Generalized Mass-Redistributed Smoothed Finite Element Method (MR-SFEM) for Acoustic and Acoustic-Structural Interaction Problems

2019 ◽  
Vol 16 (04) ◽  
pp. 1850098 ◽  
Author(s):  
Y. D. Hao ◽  
G. Y. Li ◽  
X. Nie ◽  
Z. H. Hu ◽  
W. Yao
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Mass Matrix ◽  
System Matrix ◽  
Acoustic Structure ◽  
Structural Interaction ◽  
Structure Interaction ◽  
Structural Problems ◽  
Acoustic Domain ◽  
Element Method

The standard finite element method (FEM) is known for its “over-stiff” behavior, which leads to the pollution error in acoustic and acoustic-structural problems. In this paper, a generalized mass-redistributed smoothed FEM (MR-SFEM) is proposed to analyze the acoustic and acoustic-structure interaction problems. In the new MR-SFEM, the generalized mass matrix reconstitution technology is used for both the structural and acoustic discretized system based on the SFEM, which can provide a perfect balance of the discretized system matrix both in the structure and acoustic domain. The global equations of acoustic-structural interaction problems are established by coupling the MR-SFEM for the structure and for the acoustic domain. Some numerical examples of acoustic and acoustic-structure interaction problems have been used to assess the present formulation, and the results show that the present method has much better performance in terms of accuracy, convergence, and efficiency than those obtained using the standard FEM, edge-based FEM (ES-FEM), and face-based FEM (FS-FEM).

An Overview of the Finite Element Method on the Tool-Soil Interacting Problem of Tillage

2014 ◽  
Vol 707 ◽  
pp. 397-400 ◽  
Author(s):  
Xiao Hong Liu ◽  
Yan Yu ◽  
Li Chun Qiu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Computer Aided Design ◽  
High Efficiency ◽  
Low Cost ◽  
Dynamic Effect ◽  
Research Progress ◽  
The Finite Element Method ◽  
Displacement Fields ◽  
Element Method

This article introduced the up-to-date research progress on the tool-soil interacting problem of tillage; and investigated the situation of constitutive relation usage in the finite element method (FEM). A review including the dynamic effect on the performance of tillage operation with FEM has been conducted. It showed that the virtual reality method with FEM had made much progress in evaluating the tool draft, distribution position of stress and strain, displacement fields and acceleration in soil-tool interactions, soft ware package of computer aided design of tillage tools; it will be a low cost and high efficiency assistive tool in the development procedure of tillage tools, and can be applied to study and analyze the performance of resulting prototypes.

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