从nastran到adams产生柔体几种方法.ppt
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1、Chapter 11 MSC.Nastran/MSC.Adams Interface,Table of Contents,Purpose of MSC.Nastran/Adams Flex Interface Features Supported Users Interface Output for MSC.Adams MSC.Adams Units MSC.Nastran/Adams Interface Examples Example 1Component as a superelement Example 2Component as residual structure only Exa
2、mple 3Component Restarting from SOL 106 to SOL 103 Guidelines and Limitations,Purpose of MSC.Nastran/Adams Flex Interface,Incorporates reduced flexible body component dynamics from MSC.Nastran into MSC.Adams Flex For performing system flexible body analysisincluding large rigid body motions Typical
3、Applications: Elasto-kinematic analysis of vehicular suspensions Engine crankshaft-drive train interaction Aircraft landing conditions Satellite panel deployment,Purpose of MSC.Nastran/Adams Flex Interface (cont.),Prior to MSC.Nastran 2004, this type of coupling is a two steps process Generates an o
4、utput2 file from MSC.Nastran using an dmap alter Converts this output2 file into an MSC.Adams Modal Neutral file (MNF file) using OUT2MNF This file is then readable by MSC.Adams Flex In 2004, you can generate the MNF file directly from MSC.Nastran,Features Supported,The component can be a supereleme
5、nt The exterior points are the attachment points Supports both main bulk and part superelements The component can be residual structure Use ASET/ASETi to define attachment points Supports the use of statsub for prestiffening with small deflection in SOL 103 Supports large displacement with preload R
6、un SOL 106 with preload and save database Restart in SOL 103 using “param,nmloop,x”,Users Interface,Only two new commands/entries are required Case Control command to generate MNF file ADAMSMNF FLEXBODY=YES Bulk Data Entry to specify units used by ADAMS/Flex DTI,UNITS,1,mass_unit,force_unit,length_u
7、nit,time_unit e.g., DTI,UNITS,1,KG,N,M,SEC Additional features will be shown in the example sections,Users Interface (cont.),Full ADAMSMNF Case Control command,Most commonly used options,Output for MSC.Adams,The following output are generated for MSC.Adams: Modal stiffness Modal mass Modal load Diag
8、onal matrix of a-set unit boundary displacement Physical mass matrix Stress shape Strain shape,MSC.Adams Units,MSC.Adams is not a unitless code Param,wtmass,x is used in MSC.Nastran to scale weight/mass units, but is ignored in Adams/Flex Correct set of units must be specified on the DTI,UNIT,1, ent
9、ry Example: If the model are using the following units Mass: grams Force: N Length: meters Time: seconds,MSC.Adams Units (cont.),Example (cont.): The corresponding scale factor on wtmass is .001,but the following DTI entry must be used DTI,UNITS,1,gram,n,m,s A list of acceptable units for MSC.Adams
10、is shown below:,MSC.Nastran/Adams Interface Examples,The simple plate model to the right is used to illustrate 3 separate salient features of the MSC.Nastran/Adams interface. The first example is for a flexible body component as a superelement. The second example is for a flexible body component usi
11、ng residual structure only The third example is to preload the structure in SOL 106 and restart into SOL 103 to genereate the flexible body component,Example 1Component as a superelement,Model the whole structure as a superelement with grid points 1, 11, 111, and 121 as boundary points (exterior poi
12、nts) This is done by the usual SESET entries These boundary points also become attachment points in MSC.Adams Define the SPOINTs and SEQSETs for component modes Define the units for MSC.Adams DTI,UNITS,1,mass_unit,force_unit,length_unit,time_unit,Example 1Component as a superelement (cont.),Request
13、mass invariants for export to MSC.Adams This is done by the param,grdpnt,x The GPWG module will be executed twiceonce for the regular mass matrix for MSC.Nastran and once for the MSC.Adams. The mass matrix is always calculated about the origin of the basic coordinate system for MSC.Adams Request MNF
14、 file for MSC.Adams This is done by the “ADAMSMNF flexbody=yes” Case Control callout Use PLOTEL elements to create reduced geometry for MSC.Adams display This is done by the PSETID=x option on the ADAMSMNF Case Control command. The PSETID points to a set ID referenced in the OUTPUT(PLOT) section,Exa
15、mple 1Component as a superelement (cont.),Input File SOL 103 CEND $ TITLE= SIMPLE PLATE MODEL 10 X 10 ELEMENTS $ ADAMSMNF flexbody=yes, psetid=100 $ METHOD=300 $ RESVEC = COMPONENT $ $ Set to define component shapes $ OUTPUT(PLOT) SET 100 = 10001 THRU 10010 $ BEGIN BULK $ $ ADAMS REQUIRES following
16、DTI $ DTI,UNITS,1,KG,N,M,SEC $ $ Turn on gridpoint weight generator $ PARAM,GRDPNT,0 $ EIGR 300 LAN 10 $ SESET,200,2,THRU,10 SESET,200,12,THRU,110 SESET,200,112,THRU,120 $ SPOINT,80001,THRU,80018 SEQSET1,200,0,80001,THRU,80018,$ PLOTEL,10001,1,12 PLOTEL,10002,12,121 PLOTEL,10003,121,111 PLOTEL,10004
17、,111,1 PLOTEL,10006,2,10 PLOTEL,10007,22,110 PLOTEL,10008,120,112 PLOTEL,10009,12,100 $ $ SEELT to put element 1003 and 1004 into SE 200 $ SEELT 200 10003 10004 $ $ Get model data and load data $ include model1.dat $ ENDDATA,Example 1Component as a superelement (cont.),Abridged Output,Example 1Compo
18、nent as a superelement (cont.),Abridged Output (cont.),Example 2Component as residual structure only,Model the whole structure as residual with grid points 1, 11, 111, and 121 as attachment points to MSC.Adams This is done by specifying the boundary grids with the ASET entries Define the SPOINTs and
19、 QSETs for component modes Define the units for MSC.Adams DTI,UNITS,1,mass_unit,force_unit,length_unit,time_unit Request mass invariants for export to MSC.Adams This is done by the param,grdpnt,x The GPWG module will be executed twiceonce for the regular mass matrix for MSC.Nastran and once for the
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