機(jī)械專業(yè)外文翻譯--學(xué)習(xí)運(yùn)用proengineer幾何模型建立有限元模型的過程-資料下載頁
2025-05-12 00:22本頁面
【導(dǎo)讀】外文資料內(nèi)容與課題相關(guān)，譯文能正確地表達(dá)原文的意文，語言表述基本符合漢語的習(xí)慣，語句較通順，層次清晰。本學(xué)習(xí)的目的不是要深入學(xué)習(xí)Pro/ENGINEER的力學(xué)或者生。創(chuàng)建一個(gè)單獨(dú)的模型的時(shí)間更短的桑迪亞職員提供建議。該研究評(píng)價(jià)了運(yùn)用。Pro/ENGINEER建立各種各樣的幾何形狀和對設(shè)計(jì)師、繪圖員、分析師提供一般建議。ArloAmes的見解和運(yùn)用Pro/ENGINEER的能力是非常寶貴的。計(jì)算，和5)檢驗(yàn)分析結(jié)果。本研究檢驗(yàn)前兩步驟之間的關(guān)系，本研究的原因是電。傳統(tǒng)的制造目的藍(lán)圖，而且還可以對計(jì)算機(jī)制造工藝和有限元分析傳輸電子信息。Pro/ENGINEER作為其設(shè)計(jì)標(biāo)準(zhǔn)來定義計(jì)算機(jī)程序，審查Pro/ENGINEER某些細(xì)節(jié)。了了解主要研究這樣做的意義。對問題進(jìn)行必要的假設(shè)后建立一個(gè)有限元模型。在這兩種情況下或者重新創(chuàng)建幾何模型或者使用Pro/ENGINEER的實(shí)體模型，止傳統(tǒng)有限元模型已低于十萬單元。目前生成網(wǎng)格技術(shù)和嚙合過程中有一些已知的障礙。這些障礙包括1）帶有小。在2-D中，目前的鋪平技術(shù)現(xiàn)在仍然存在著一般性三角形和四邊形單
【正文】 lyst’s model building. This is despite the fact that the drafter is almost always funded by the designer rather than the analyst, and therefore might feel reluctant to do any model modification for the analyst unless agreed to by the designer. Problems with Current Mesh Generation Current mesh generation technology and the meshing process have some known obstacles. These include 1) problems meshing large geometries with small features, 2) problems meshing plex nonstandard geometric shapes, 3) problems using solid geometries to create shell models, 4) problems modeling the connectivity between different parts of assemblics, 5) problems handling tolerances, and 6) problems transferring geometry information from solid modeler codes such as pro/ENGINEER into mesh generation codes. Traditional mesh generation technology can automatically mesh low order shapes, specifically, points, lines, foursided surfaces, and 6sided solids. In two dimensions, current paving techniques now exist to also mesh general geometries with three –and foursided elements. These techniques are relatively robust. In three dimensions, current techniques now exist for automatically meshing general shapes with tetrahedral (tet) elements, but not the more desirable hexahedral (hex) elements. However, there threedimensional mesh generation codes are not robust enough to always successfully mesh every geometry, and they have increasing difficulty with increased geometry plexity. Specifically, having many small features in a large plex geometry often causes mesh generation codes to fail because they cannot plete the transitions well from small elements (around the small features ) to large elements and back again ( to the next small feature). The same problem may also occur in a part with no “small” features, but with lots of plexity. That is, transitioning from feature to feature can eventually fail because the mesh generation codes usually start at one location and “sweep” toward another location. An analyst may need to break up a single threedimensional part into several “subparts” in order to successfully mesh the part Another area where current mesh generation has problems is in creating a shell model from a threedimensional geometry. A shell finite element has no thickness, but assumes the stiffness of something which has half of the thickness on either side of the element ( that is, it is assumed to be positioned at the midplane of the thickness). Because they have no thickness, parts modeled with shell elements which are supposed to physically interface with other parts will now be geometrically separated by a gap. Defining these new interface can often be difficult. Futhermore, solid model design definition codes (such as pro/ENGINEER) do not easily or automatically provide this midplane surface location to the mesh generation codes in the first place. Thus, an analyst may have to create geometry to be used in making the shell element model, and may also have to create geometry to define the interfaces in the shell element model.
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