整理k01白車身GM28工況分析報告減重20151027

1、K01設(shè)計開發(fā)項目白車身GM28工況分析報告（初版/更改）重慶迪科汽車研究有限公司二五年十月數(shù)據(jù)記錄初始模型白車身（BIW）更改情況減重后分析內(nèi)容白車身GM28工況分析模型簡述使用軟件前處理：Hypermesh；求解器：Radioss建模過程網(wǎng)格劃分白車身結(jié)構(gòu)可分為五個總成：頂蓋、地板、側(cè)圍、后圍和前圍，依次對各總成進(jìn)行有限元模型的建立，再將其焊接為一整體。建立白車身有限元模型的步驟包括幾何模型分析、幾何清理、模型簡化、網(wǎng)格劃分、單元質(zhì)量檢查、設(shè)置材料和單元屬性、各部件焊接等。由于白車身主要是由大的鋼板覆蓋件組成，其厚度尺寸遠(yuǎn)遠(yuǎn)小于其他尺寸，故白車身網(wǎng)格選用PSHELL的殼單元形式。采用各總成

2、逐個劃分、連接，再總裝的方式進(jìn)行整車的有限元建模。據(jù)工程實踐和硬件條件，選取有限元網(wǎng)格的大小為8mm。白車身各部件連接白車身大部分零部件是薄板沖壓件，各零部件之間主要是通過焊接工藝實現(xiàn)連接，本次運(yùn)用了點(diǎn)焊、縫焊等。根據(jù)所提供的焊點(diǎn)圖，在Hypermesh中通過運(yùn)用spot-weld單元來把各板件焊點(diǎn)位置的節(jié)點(diǎn)連接起來，以此來模擬實際的焊點(diǎn)。焊點(diǎn)材料選用08AL,焊點(diǎn)直徑為7mm。焊接完成后，焊點(diǎn)周圍單元的質(zhì)量可能會變差，通常需要對這些單元進(jìn)行重新劃分。有限元焊接結(jié)果如圖3.6所示圖3.6有限元焊接效果圖由于工藝和部件性能的要求，在頂蓋與頂蓋橫梁處，運(yùn)用了粘膠連接。本次分析采用了軟件的粘膠連接來

3、實現(xiàn)這些有限元部件的連接，通過這樣的處理能更好的模擬結(jié)構(gòu)的實際性能。有限元粘接效果如圖3.7所示。圖3.7有限元粘膠連接效果圖在前圍總成中還采用了螺栓連接，這主要是一些不需永久連接、進(jìn)行更換的部件。在Hypermsh中采用BOLT工具在螺栓孔處添加螺栓連接。效果圖3.8如所示。圖3.8有限元螺栓連接效果圖利用Hypermesh軟件按照以上的步驟完成了白車身的有限元模型的建立。整個白車身有限元模型如圖3.9所示，模型共計566389個節(jié)點(diǎn)，547291個PSHELL單元和22776個五面體、六面體單元。PSHELL單元中有四邊形單元501997個，三角形單元45294個，占全部PSHELL單元單

4、元的3.78%。白車身總成共有3318個焊點(diǎn)，34處粘膠和319個螺栓。網(wǎng)格劃分完成后，按各部件給定的材料，對相應(yīng)的網(wǎng)格設(shè)置材料和單元的特性。圖3.9白車身有限元模型邊界及工況通用28工況分析邊界條件工況工況描述重力加速度工況類型XYZ1靜態(tài)設(shè)計位置（動力總成自重下）-1典型2發(fā)動機(jī)最大前進(jìn)扭矩-1典型3發(fā)動機(jī)最大后退扭矩-1典型4發(fā)動機(jī)最大前進(jìn)扭矩&前進(jìn)加速度0.5-1典型5發(fā)動機(jī)最大前進(jìn)扭矩&左轉(zhuǎn)1-1典型6發(fā)動機(jī)最大前進(jìn)扭矩&右轉(zhuǎn)-1-1典型7發(fā)動機(jī)最大前進(jìn)扭矩&垂直向下沖擊-7典型8發(fā)動機(jī)最大前進(jìn)扭矩&垂直回彈1典型9發(fā)動機(jī)最大后退扭矩&后退加速度0.6-1典型108KPH前碰（-11

5、g）-11-1極端的118KPH后碰（11g）11-1極端的12垂直向上加載（深坑）4極端的13垂直向下加載（深坑）-6極端的14橫向相左加載-3-1極端的15橫向相右加載3-1極端的16垂直向上&橫向相左加載-34極端的17直向上&橫向相右加載34極端的18垂直向下&橫向相左加載-3-6極端的19垂直向下&橫向相左加載3-6極端的20壞路向上2.5典型21壞路向下-4.5典型22前進(jìn)縱向加載（全油門加速）-3-1典型23后退縱向加載（全油門加速）3-1典型24全油門N到D檔/離合器低檔全油門結(jié)合-1極端的25全油門N到R檔/離合器倒檔全油門結(jié)合-1極端的261倍重力加速度載荷-1典型27部分

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29、陽門理可i|g-=*d.!fmuDjsa|tuyiii|jEIS:也卜戶訓(xùn)丄L旺空沖石卩閑EN杞IWOI-蟆日側(cè)陽門馳石1|肥列.I6iK(T7弼囚I即I舊i-3Zg&Z=LJ!ri訕唧卩陽E3D-39Z9T-WM舊曲Z：MTf口Ki-ICHLS口咱逐卜CCraSC口咖癡和沁BEUW|：S口器橢囚羽(ecnEiHUCjfac1口3E=3J|E：N3iuai37飢月凹”WBOO+3i3GDt)=MH用胡葉昨DO3ICSE=H=N|-3|：|：|w-aieeifw-afyri瞰臼旳LLiMMT0舊泓rDME06E：JUW|*5)E|El!：yVOlDMiuaiijajHidqaHd*3屮8：i(6

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32、licAnasisFram&I整體應(yīng)力CoMpirPiol:ElemenlStresses(2口iLBDjrjnNis,Ms)山駁1池|5|昭督価infliMedelinfs1RkuIIEi.iBrALfEifMillGrjafl旳dE亂期Er01&2E-氐:期Er2.3iiE-1541E-TJOIErCG31E-14NniisdlHis-fi.&SSe-Crli3rtdM0271SWm=i0i.OBJE-1dOrldSi12DB?靈&*30陽坨可SlarlicAn5l)5Framb4局部應(yīng)力(20MPa)hkdelirfc1F-；ulrEfl-U1.i,E：rX!.i,ErA,.|CIH-GM2Bh3dSubcase20|lMd-2T|.ShlicAnahi-eisFiMP4-位移CpMpurPtal:DiacemeMiNaai1.5t2?MaUMEHJO6724E-r1(54：3E-n4：3&2E-&12.101E-&1fl.OOGMaNaa=1.B&3&-KMGiltlaHh=OlQ0(iE+OiCrldE4n3B1QZModelinfix1p-；uliE/kUi