Design Of Stiffener In The Electronic Cabinet Based On The Three-Field Coupling Analysis

Analysis and design of electronic cabinets, usually involving structural design, thermal design and EMC design of the interaction of the three disciplines. In this paper, automotive electronics cabinet as the research object, consider the performance requirements of the three disciplines to study the overall optimization of its methods and ways to realize, the main contents include:1)According to the relevant standards of cabinet,in view of the object in this paper,the finite element model of cabinet is built,which it is based on the shell elements,beam elements and solid elements.2)Based on the theory of mechanical vibration and the principle in finite element method, modal analysis, transient analysis and random vibration (PSD) analysis are carried out.The results indicate that the finite element model in this paper can rather accurately reflect the general dynamic characteristic of the cabinet.3)Through the results of dynamic analysis,the weak parts of cabinet are found and the preliminary research of stiffener layout in the cabinet is carried out.So can not only effectively and accurately amend the weak parts but also provide a reference for optimization in cabinet structure embedded in vehicles.4)In order to solve the problem of communication among softwares of ANSYS,ICEPAK and FEKO,interface program is developed.This program builds solid foundation of subsequent three-field analysis and optimization.5)By employing the first-order natural frequency of eletronic cabinet as objective function,the thickness of cabinet board,the coordinates, parameters of stiffener and size of the blowholes as design variables,temperature,shield capability,displacement,stress and mass as constraints.By calculating,the model of cabinet is received,which the performances of structure,thermal and EMC are met.