机械专业外文翻译--学习运用proengineer几何模型建立有限元模型的过程(编辑修改稿)

机械专业外文翻译--学习运用proengineer几何模型建立有限元模型的过程(编辑修改稿)内容摘要：

electronic transfer of information can save the analyst a significant amount of time in both steps 1 and 2. In addition , the mesh generation codes have also improved significantly in the last decade . Many different codes now have the capability of automatically generating shell meshes on general surfaces .and some have (or are close to having ) the ability to mesh generalshaped solids automatically with either tetrahedral or hexahedral elements. Because things are changing so quickly analysts and drafters may not have experience in how to best use these new tools .This study was undertaken to understand some of the mechanisms which would enhance the process of creating finite element models using today39。 s electronic tools and using electronic design definition as input to the analyst. Since sandia has chosen pro/ENGINEER as its standard design definition puter program, pro/ENGINEER was examined in some detail. In order to understand the details and the significance of the different phases of this study, we believe that the reader needs to have a basic understanding of several areas. These areas include a brief background of the finite element process, a current status of mesh generation capabilities(including current problem areas), a description of different pro/ENGINEER capabilities and how they apply to the finite element analysis process, and an understanding of how these technological changes might affect the interrelationship between the work the designer, the drafter, the analyst, and the manufacturer ,the reader is encouraged to thoroughly study these introductory sections .in order to understand the significance of things that were done in the main study. Background The process of performing finite elements analysis of systems or ponents has in the past been challenging .the analyst could be call on to give either a very preliminary estimate of a structural or thermal response, or a very detailed prediction of that same response. To perform the evaluation, the analyst was typically given a geometry definition , either in paper or electronic form ,some materials information , and some load information .the analyst took this information and made enough assumptions about the problem to allow a finite element modal to be built which would result in an acceptable answer within the available amount of time. Thus, a limited time to perform an analysis was a third constraint. Often, the geometry information was given to the analyst in paper form . The analyst needed to make decisions based on experience to determine how muc h of the detail (such as bolt holes ,cutouts, etc.) to include in order to have an acceptable level of accuracy in the analysis .then the analyst recreated, in some form , a simplified version of the geometry which had already been created by a drafter, this process , of reconstructing the geometry for the finite element model, and then of creating the finite element model , took up to 80% of the analyst39。 s time and efforts. With the more prevalent use of solid modeler design defi。