Introduction

Recently there is a trend towards using it in the early stages of design.
A designer may use FEA just to validate the structural integrity of a design or she may use it for structural optimization along with the parametrized design techniques.This paper examines the requirements of a structural analysis agent and proposes an architecture to facilitate FEA in a concurrent design environment. The next section briefly describes how FEA is used in a typical industrial set up.Section 3 presents a survey of existing FE tools. Section 4 discusses some issues related to the development of an FEA agent. Section 5 proposes an architecture for the FEA agent that addresses the issues described in Section 4 and finally Section 6 presents the concluding remarks.

Steps in Finite Element Analysis

The process of FEA starts with identification of the region of interest and the formulation of the physical problem。[1]. The region of interest might be an assembly, a component or a portion of a component (or an assembly). The interaction of the rest of the assembly and the environmental conditions with the region of interest is captured in two ways. One way to represent this interaction is to idealize them as loads and displacement constraints on the region of interest. For example a spot weld fixing a component to a bigger structure will result in a constraining all the degrees of freedom at that point. The other commonly used method is to use spring and/or gap elements.


介紹

最近有一種將有限元分析用在設(shè)計(jì)早期的趨勢(shì)。設(shè)計(jì)人員可以使用有限元分析軟件來(lái)設(shè)計(jì)和驗(yàn)證結(jié)構(gòu)的完整性或者優(yōu)化參數(shù)設(shè)計(jì)技術(shù)。本文討論了對(duì)結(jié)構(gòu)分析媒介的要求，并且提供了一個(gè)在給定的設(shè)計(jì)環(huán)境下的有限單元分析的優(yōu)化體系結(jié)構(gòu)。下一節(jié)將簡(jiǎn)要介紹有限單元是怎樣被用在典型工業(yè)的生產(chǎn)上的。第3節(jié)介紹了現(xiàn)有的有限元工具的調(diào)查。第4節(jié)討論了一些涉及到有限元分析的發(fā)展問(wèn)題。第4節(jié)發(fā)現(xiàn)的詳細(xì)問(wèn)題是有限元分析的起因，筆者在第5節(jié)對(duì)其提出了一個(gè)結(jié)構(gòu)體系并在在第6節(jié)做出了總結(jié)。

有限元分析的發(fā)展

有限元是伴隨確認(rèn)重要部位和對(duì)物理學(xué)問(wèn)題的構(gòu)想進(jìn)行的。[1] 重要的區(qū)域可能是一個(gè)配件、元件或者是元件的一部分。一個(gè)靜止配件的配合和重要部件的環(huán)境條件是捕獲的兩種途徑。----------------一種代表配合的方法是用理想化的負(fù)載和位移做為重要部位的系統(tǒng)規(guī)定參數(shù)。例如，把一個(gè)元件用焊接的方法固定在一個(gè)更大的部件上將導(dǎo)致這個(gè)點(diǎn)上所有的自由度受到約束。另一種常用的方法是使用彈簧或者間隙元素。---------------------