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1、禾U用 Hypermesh 禾口 nastran 仓U建 mnf 流程1.建立几何模型，定义材料属性、单元属性。2.创建约束和特征值卡，如下：约束为无量纲。定义为misl,选择下列四点确定一个节点集定义。定义单元集。特征值为EIGRL特征。VIJV2 ND MSGLVL ) SHFSCL NORME I GRL3 0 D|-1 . OOC|:MASg3.对控制卡进行设置SOL 1 0 3(2) PARAMGRDP_W |PARAM,GRDPNT,G(3) case_ un supported_cardsControl CardnDAMSMNF FLEXBODV=VESvOUTCSTRN=VES
2、,OUTGSTRS-NORSUEC=N0GPSTRniN(PLOT)=ALLOUTPUT(POST)SURFACE 1D1 SET 100 NORMAL X3 FIBRE=Z1ADAMSMNF FLEXBODY=YES,OUTGSTRN=YES,OUTGSTRS=NO RESVEC=NOGPSTRAIN(PLOT)=ALLOUTPUT(POST)SURFACE 101 SET 100 NORMAL X3 FIBRE=Z1(4) bulk _un supported _cardsDTI,UNITS,1,KG ,N,M,S(5) global_case_c on trolOutput栏中相关文档；
3、Tran slati ng MSC.Nastra n DataThere are two differe nt in terfaces that you use to tran slate MSC.Nastra n data for use in ADAMS/Flex. Lear n about:* Using MSC.Nastran 2004 and Above Verifyi ng the Model* Comput ing Stress/Strain Modes* XRB Support for Stress/Strain Modes* Shorte ned Stress/Strain
4、ModesUsi ng MSC.Nastra n 2004 and AboveStart ing in versi on 2004, MSC.Nastra n provides an improved in terface for gen erati ngmodal neutral files (MNFs) E3. The new MSC.Nastra nADAMS In terface allows you to gen erate an MNF directly fromMSC.Nastra n without gen erati ng an OUTPUT2 file. The MSC.N
5、astra n ADAMS In terface does not require a DMAP alter or a tran slator to con vert MSC.Nastra n output files to MNFs.The MSC.Nastra n ADAMS In terface is a lice nsed feature ofMSC.Nastra n. For more in formati on, con tact your local sales represe ntative. If you already have the MSC.Nastra n ADAMS
6、 In terface lice nse, refer to theMSC.Nastra n Quick Refere nee Guideand Refere nee Manualfor in formatio n on how to use it.Verifyi ng the ModelThe MSC.Nastra n tran slator writes a summary of themodal n eutralfile (MNF)CHexport to the termi nal win dow. If you are usingMSC.Nastra n 2004 or above,
7、the ADAMS in terface writes a summary of the MNF export to the MSC.Nastran output file. Please review this data for any concerns. In particular, en sure that the: Mass, cen ter of mass locati on, and mome nts of in ertia are as expected. During the MNF write, the con stra int modes and the con stra
8、ined no rmal modes are orthog on alized. This yields modes that are: o An approximatio n of the free-body no rmal modes. o In terface modes, where the in terface is the collect ion of all the attachme nt point DOFs.Also, verify that the free body no rmal modes have a reas on able n atural freque ncy
9、. You should expect to see six rigid-body modes, uni ess displaceme nt boun dary con diti ons are prese nt.Comput ing MSC.Nastra n Stress/Strai nModesFor ADAMS/Durability to process stresses or strai ns on flexible bodies, modal stress or stra in shapes n eed to be prese nt in themodal n eutralfile
10、(MNF)G3of the flexible body. You do this by havi ng MSC.Nastra nrecover a stress or stra in mode for every mode shape computed forComp onent Mode Syn thesis (CMS). MSC.Nastra n Grid Poi nt Stresses Example Known Limitati ons. Problems, and Restricti onsMSC.Nastran Grid Point StressesBecause modal in
11、 formati on contained in the MNF can only be associated with no des, the MSC.Nastra n grid-po int stress data recovery opti on is required. The followi ng Case Con trol comma nds are required in the MSC.Nastra n in put file to compute stress or strain modes for the MNF: GPSTRESS: Requests grid point
12、 stresses output.* GPSTRAIN: Requests grid poi nt strai ns output. STRESS(PLOT): Requests eleme nt stress output.* STRAIN(FIBER,PLOT): Requests eleme nt strain output. OUTPUT(POST): Delimiter. SET: Defines a set of eleme nts for a surface or volume. SURFACE: Defines a surface of plate eleme nts refe
13、re need by the SET comma nd.* VOLUME: Defines a volume of solid eleme nts refere need by the SET comma nd.For more in formatio n on these comma nds, see the Case Con trolsecti on of the MSC.visualNastra n Quick Refere nee Guide. For morein formatio n on comput ing grid point stresses, see theMSC.Nas
14、tranLin ear Static An alysis Users Guide .Notes: You can only tran sfer one surface stress or strain fiber of plate eleme nts to the MNF for processi ng in MSC.ADAMS. If more than one fiber is specified on the SURFACE card, the msc2mnf tran slator issues a warning message and only tran sfers the fir
15、st surface stress fiber it finds in the OUTPUT2 file.In clud ing stress or stra in modes in the MNF can sig nifica ntly in crease the file size. Therefore, it becomes even more important to optimize the MNF if possible. For information on optimizing the MNF, see Optimizing an MNF. Including both stress and strain modes willfurther in crease the size of the MNF and is gen erally not recomme nded for large models, uni ess both qua ntities are n eeded.Whe n defi ning subcases in Case Con trol, you must have the GPSTRESS, GPSTRAIN, STRESS, and STRAIN cards before the first SU
