patran_柔性體建模教程

1、ADAMS, Patran, Nastran, Fatigue Integration 2004Copyright 2004 MSC.Software CorporationNastran, Patran, ADAMS, Fatigue的整合操作練習的整合操作練習ADAMS, Patran, Nastran, Fatigue Integration 2004Copyright 2004 MSC.Software Corporation開啟新檔案開啟新檔案ADAMS, Patran, Nastran, Fatigue Integration 2004Copyright 2004 MSC.Soft

2、ware Corporation產(chǎn)生一個產(chǎn)生一個solid幾何幾何ADAMS, Patran, Nastran, Fatigue Integration 2004Copyright 2004 MSC.Software Corporation產(chǎn)生網(wǎng)格產(chǎn)生網(wǎng)格ADAMS, Patran, Nastran, Fatigue Integration 2004Copyright 2004 MSC.Software Corporation定義連接點定義連接點ADAMS, Patran, Nastran, Fatigue Integration 2004Copyright 2004 MSC.Software

3、 Corporation選擇兩端固定點的位置選擇兩端固定點的位置ADAMS, Patran, Nastran, Fatigue Integration 2004Copyright 2004 MSC.Software Corporation在兩個端點附近加上在兩個端點附近加上RBE2 將周圍的點當成dependent點, 固定端當成independent點並選擇傳遞所有自由度ADAMS, Patran, Nastran, Fatigue Integration 2004Copyright 2004 MSC.Software Corporation在兩個端點加上在兩個端點加上RBE2若沒有加上RB

4、E2, 則會因為只綁住兩個solid element的node,造成有rotational 的singularityADAMS, Patran, Nastran, Fatigue Integration 2004Copyright 2004 MSC.Software Corporation按下按下Apply, 定義完成定義完成ADAMS, Patran, Nastran, Fatigue Integration 2004Copyright 2004 MSC.Software Corporation定義材料定義材料ADAMS, Patran, Nastran, Fatigue Integrati

5、on 2004Copyright 2004 MSC.Software Corporation定義材料定義材料ADAMS, Patran, Nastran, Fatigue Integration 2004Copyright 2004 MSC.Software Corporation定義元素特性定義元素特性ADAMS, Patran, Nastran, Fatigue Integration 2004Copyright 2004 MSC.Software Corporation定義分析參數(shù)定義分析參數(shù)ADAMS, Patran, Nastran, Fatigue Integration 2004

6、Copyright 2004 MSC.Software Corporation定義定義ADAMS的的mnf輸出輸出跳出的兩個視窗可以忽略不理Num. Shapes to Adams為Nastran中 SPOINTS & QSET的數(shù)目必須 = modes requested on EIGRL + 6 + num of load case單位要跟ADAMS中用的一樣ADAMS, Patran, Nastran, Fatigue Integration 2004Copyright 2004 MSC.Software Corporation指定欲輸出的模態(tài)數(shù)指定欲輸出的模態(tài)數(shù)Number o

7、f Desired Roots即是Nastran的EIGRL指令A(yù)DAMS, Patran, Nastran, Fatigue Integration 2004Copyright 2004 MSC.Software Corporation設(shè)定輸出的結(jié)果設(shè)定輸出的結(jié)果ADAMS, Patran, Nastran, Fatigue Integration 2004Copyright 2004 MSC.Software Corporation設(shè)定輸出的結(jié)果設(shè)定輸出的結(jié)果（更新）（更新）此更新在patran2005ADAMS, Patran, Nastran, Fatigue Integration

8、2004Copyright 2004 MSC.Software Corporation開始開始Nastran計算計算demo.mnf為ADAMS的柔性體格式, 內(nèi)含的模態(tài)數(shù)為10+6+2*6=28demo.out為OP2格式, 專為Fatigue分析而用(含對應(yīng)ADAMS的28個模態(tài))demo.xdb為XDB格式, 僅包含EIGRL所要求輸出的10個模態(tài)ADAMS, Patran, Nastran, Fatigue Integration 2004Copyright 2004 MSC.Software Corporation將將MNF檔讀入檔讀入ADAMSADAMS, Patran, Nast

9、ran, Fatigue Integration 2004Copyright 2004 MSC.Software Corporation設(shè)定設(shè)定ADAMS的環(huán)境的環(huán)境ADAMS, Patran, Nastran, Fatigue Integration 2004Copyright 2004 MSC.Software Corporation檢視各模態(tài)的振形檢視各模態(tài)的振形在Flex上按下右鍵, 選擇ModifyADAMS, Patran, Nastran, Fatigue Integration 2004Copyright 2004 MSC.Software Corporation定義相關(guān)條件並

10、執(zhí)行分析定義相關(guān)條件並執(zhí)行分析ADAMS, Patran, Nastran, Fatigue Integration 2004Copyright 2004 MSC.Software Corporation載入載入A/Durability的模組的模組ADAMS, Patran, Nastran, Fatigue Integration 2004Copyright 2004 MSC.Software Corporation透過透過A/Durability, 將各模態(tài)對應(yīng)的結(jié)果將各模態(tài)對應(yīng)的結(jié)果轉(zhuǎn)到轉(zhuǎn)到Fatigue繼續(xù)分析繼續(xù)分析ADAMS, Patran, Nastran, Fatigue In

11、tegration 2004Copyright 2004 MSC.Software CorporationA/Durability自動將資料轉(zhuǎn)換到自動將資料轉(zhuǎn)換到Patran中中ADAMS, Patran, Nastran, Fatigue Integration 2004Copyright 2004 MSC.Software Corporation定義定義Fatigue的分析條件的分析條件ADAMS, Patran, Nastran, Fatigue Integration 2004Copyright 2004 MSC.Software Corporation注意事項注意事項nASET中,

12、需要要足夠的自由度以支撐結(jié)構(gòu)u若沒有定義RBE2, 則solid element只有Tx, Ty, Tz的自由度, 只支撐兩端點時並不足以讓結(jié)構(gòu)穩(wěn)定n若要輸出模態(tài)應(yīng)力, 則在output request中就要選擇grid point stress的輸出nADAMS讀入mnf檔後, 需移動至正確位置後再進行分析n*.mnf檔中, 包含的模態(tài)數(shù)量計算方法為u28 = 2 Adams connection points * 6 dofs + 10 modes requested on EIGRL + 6 inertia modes + 0 load casen執(zhí)行完Fatigue分析, 可透過A/D

13、urability將結(jié)果讀回ADAMS, 在ADAMS中檢視應(yīng)力, 疲勞壽命及損傷程度ADAMS, Patran, Nastran, Fatigue Integration 2004Copyright 2004 MSC.Software Corporation注意事項注意事項（續(xù)）（續(xù)）n單位設(shè)置問題：在patran中輸出MNF文件的正確單位設(shè)置應(yīng)該是：Megagram N mm s如下圖所示,因此其density=7.8E-009(如果材料=steel)如果單位是KG N mm S 將mnf導(dǎo)入adams中顯示的頻率是patran中的31.6倍,也就是1000開2次方的倍數(shù);如果將長度單位改為M的話,那就更不對了,因為將mnf文件導(dǎo)入adams中后零件尺寸放大了,與實際不相符.結(jié)果文件輸出格式：如下圖所示，正確的方法應(yīng)該是選擇advanced-Direct,這樣才能夠得到含有應(yīng)力應(yīng)變信息的mnf文件。 如果選擇Both,用na