Frequency response analysis of cylindrical shells conveying fluid using finite element method

2005 ◽  
Vol 19 (2) ◽  
pp. 625-633 ◽  
Author(s):  
Young-Soo Seo ◽  
Weui-Bong Jeong ◽  
Wan-Suk Yoo ◽  
Ho-Kyeong Jeong
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Frequency Response ◽  
Cylindrical Shells ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
Conveying Fluid ◽  
Element Method

scholarly journals Core influence on the frequency response analysis (FRA) of power transformers through the finite element method

2015 ◽  
Vol 35 (1Sup) ◽  
pp. 110-117 ◽  
Author(s):  
David Leonardo Alvarez Alvarez ◽  
Javier Alveiro Rosero Garcia ◽  
Enrique Esteban Mombello
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Frequency Response ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
The Finite Element Method ◽  
Font Size ◽  
The Core ◽  
Air Core ◽  
Element Method

<span style="font-family: OptimaLTStd; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;">In this paper the influence of core parameters in Frequency Response Analysis is analyzed through the equivalent circuit impedance <span style="font-family: OptimaLTStd; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;">matrix of the transformer winding; the parameters of the circuit have been computed using the Finite Element Method. In order to <span style="font-family: OptimaLTStd; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;">appreciate the behavior of the iron core in comparison to the air core, the frequency dependence of resonances is calculated to <span style="font-family: OptimaLTStd; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;">show how the air core only influences the results at low frequencies. The core is modeled using a complex permeability, and the <span style="font-family: OptimaLTStd; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;">parameters of conductivity and permeability are varied to show their influence in the resonances, which turned out to be negligible. <span style="font-family: OptimaLTStd; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;">In order to explain this behavior, the eigenvalues of the inverse impedance matrix are calculated showing that they are similar for <span style="font-family: OptimaLTStd; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;">different values of conductivity and permeability. Finally, the magnetic flux inside and outside the core and its influence in the <span style="font-family: OptimaLTStd; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;">frequency response is studied.</span></span></span></span></span></span></span><br style="font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" /><br class="Apple-interchange-newline" /></span>

scholarly journals A Coupled Smoothed Finite Element-Boundary Element Method for Structural-Acoustic Analysis of Shell

2017 ◽  
Vol 42 (1) ◽  
pp. 49-59 ◽  
Author(s):  
Wanyi Tian ◽  
Lingyun Yao ◽  
Li Li
Keyword(s):  
Finite Element ◽  
Boundary Element Method ◽  
Frequency Response ◽  
Boundary Element ◽  
Acoustic Analysis ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
Acoustic Problem ◽  
Element Boundary ◽  
Element Method

Abstract Nowadays, the finite element method (FEM) - boundary element method (BEM) is used to predict the performance of structural-acoustic problem, i.e. the frequency response analysis, modal analysis. The accuracy of conventional FEM/BEM for structural-acoustic problems strongly depends on the size of the mesh, element quality, etc. As element size gets greater and distortion gets severer, the deviation of high frequency problem is also clear. In order to improve the accuracy of structural-acoustic problem, a smoothed finite-element/boundary-element coupling procedure (SFEM/BEM) is extended to analyze the structural-acoustic problem consisting of a shell structure interacting with the cavity in this paper, in which the SFEM and boundary element method (BEM) models are used to simulate the structure and the fluid, respectively. The governing equations of the structural-acoustic problems are established by coupling the SFEM for the structure and the BEM for the fluid. The solutions of SFEM are often found to be much more accurate than those of the FEM model. Based on its attractive features, it was decided in the present work to extend SFEM further for use in structural-acoustic analysis by coupling it with BEM, the present SFEM/BEM is implemented to predict the vehicle structure-acoustic frequency response analysis, and two numerical experiments results show that the present method can provide more accurate results compared with the standard FEM/BEM using the same mesh. It indicates that the present SFEM/BEM can be widely applied to solving many engineering noise, vibration and harshness (NVH) problems with more accurate solutions.

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