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MSC.Nastran ERROR LIST

MSC.Nastran ERROR LIST
MSC.Nastran ERROR LIST

MD Nastran/MSC.Nastran

Error List Update

October 11, 2007

1-19390023 Documentation/QRG - CQUAD4 differential stiffness remark obsolete

Remark 6 for CQUAD4 should now read:

..."The specification of offset vectors gives wrong results in solution sequences with geometric nonlinear

analysis (SOL 106, 129, 153, 159 with PARAM LGDISP>0) The differential stiffness is computed correctly in

V2004 and higher (SOLs 5, 16, 105 and 200 and SOL 106 with PARAM LGDISP <=0)

1-19689679 2007.1.0 Case Control - Scale Factor applied to P2G lead to UFM 300

Attempting to apply a scale fact to P2G, (i.e. P2G = 1.25*PAX) may lead to user

fatal message 300 in the case control section or the factors may be ignored.

1-19948040 Elements - PSHEAR with MAT1 and Nu=-1 gives traceback

If a PSHEAR entry references a MAT1 entry with a value nu=-1, the job will fail

with a traceback since formulation of the element contains the term (1+nu).

1-21553341 2007.1.0 Elements - CBEND, TEMP(INIT) - SFM 4276 with the traceback at SDR2

A model with a CBEND element that only defines the Initial Temperature for the

thermal load failed with SFM 4276 in the SDR2 module followed by a traceback.

Avoidance: Add TEMP(LOAD) command in the case control.

See attachment for the model.

Traceback:

Offset 0x00000080 in procedure pthread_kill

Offset 0x00000060 in procedure _p_raise

Offset 0x00000030 in procedure raise

Offset 0x0000005c in procedure tracbak_

Offset 0x000000d8 in procedure osexit_

Offset 0x00000168 in procedure nsexit_

Offset 0x00000310 in procedure pexit_

Offset 0x00003c84 in procedure gperr_

Offset 0x00000084 in procedure ginit_

Offset 0x00001470 in procedure ginoa_

Offset 0x00000960 in procedure getemp_

Offset 0x00000644 in procedure sqr2d_

Offset 0x00000648 in procedure s2ebrd_

Offset 0x000011ac in procedure sdr2e_

Offset 0x00002a60 in procedure sdr2d_

Offset 0x0000023c in procedure sdr2_

Offset 0x00000174 in procedure xsem13_

Offset 0x00000228 in procedure xsemdr_

Offset 0x0000005c in procedure nastmon_

Offset 0x00000a50 in procedure mainal

--- End of call chain ---

1-22716666 2007.0.0 Installation - Windows Only,

symbol=LM_NO_SNMP=1 missing from nast20051.rcf

The symbol=LM_NO_SNMP=1 missing from the nast20051.rcf. This may cause

problems with the flexlm licensing on older Windows operating systems.

1-23956243 2007.1.0 Fastener Elements - CFAST *** USER FATAL MESSAGE 7635 (MDG2ED)

Models with CFAST elements may fail inexplicably with the following message:

*** USER FATAL MESSAGE 7635 (MDG2ED)

FOR CFAST ELEMENT ID= 177459, WITH FORM=ELEM OR PROP , THE SPOT WELD

AREA LIES OUTSIDE THE DEFINED SHELL SURFACE.

USER INFORMATION: THE NUMBER OF PAIRS OF CONNECTING SHELL ELEMENTS IS 0

BUT 4 PAIRS ARE REQUIRED.

THE SHELL ELEMENT ID WHERE GA IS LOCATED= 37585

THE SHELL ELEMENT ID WHERE GB IS LOCATED= 40980

Avoidance: There is no avoidance.

1-24287255 2007.0.1 Documentation/QRG - PARAM OMID is not supported in SOL 106

Parameter OMID is not supported in SOL 106 as indicated in Table 5-1 of the

PARAM section

1-24374298 Superelements - SEBULK EXTOP4 - UFM 4156 SEMA

If the KAA matrix in OP4 format is not Gsize (i.e. GRIDs on EXTERN <> 123456)

then the following error will occur during the assembly run:

*** USER FATAL MESSAGE 4156 (SEMA)

DIMENSIONS OR TYPE OF DATA BLOCK XAAV , SUPERELEMENT 10 TRAILER=( 22 22 6 2 12 992) ARE INCONSISTENT WITH

SUPERELEMENT MAP.

0FATAL ERROR

Avoidance: User must merge the matrix to Gsize with dmap.

This error is fixed in MSC.Nastran 2005.5.1 and MD Nastran 2006.0.1

1-34626031 2007.1.0 Parallel Processing - SYSTEM(107), PARALLEL -Shared Memory Parallel is not functioning on Windows 64

Shared Memory Parallel is not functioning on Windows 64 in MD Nastran R1.

1-34778999 2007.0.0 SOL 600 - CBUSH1D element causes SOL 600 to fail without any messages.

The CBUSH1D element causes SOL 600 to fail without any messages.

1-36316035 2007.0.0 Documentation/QRG - CQUAD4, CTRIA3 - Offsets, ZOFF

Remark 6 of the QRG CQUAD4 and CTRIA3 description is in error. For CQUAD4 and

CTRIA3 with offset (due to ZOFFS and/or unsymmetric plies and/or z0 defined on

PCOMP or PCOMPG) the differential stiffness is incorrect. Hence solutions with

the need for differential stiffness (dynamic analysis with prestress, linear

and nonlinear buckling) will produce incorrect results. However solutions with

nonlinear geometric behavior (param,lgdisp,1) will produce correct results when

the solution has converged. Please note that QUADR and TRIAR with offset will

give incorrect results in any case.

1-37202949 Documentation/QRG - MCFRACTION - UWM 300

A request of MCFRACTION output for a SET that contains no degrees of freedom in

the analysis set, will result in the message:

*** SYSTEM WARNING MESSAGE 3001 (MCFRAC)

THE INPUT DATA BLOCK NAMED RPHMCS AT POSITION 5 DOES NOT EXIST.

For example:

SET 98765 = 61/t1

SET 88765 = 0.1,0.2 $

mcfraction(structure,print,punch,solution=88765,

sort=absd,key=fraction,filter=0.0,null=12,

items=(fraction,scaled)) = 98765

where t1 of grid 61 is constrained in the s-set will result UWM 300.

1-37426759 2007.0.0 Parallel Processing/Frequency Response - Poor DMP Performance with multiple load cases

For any SOL 111 modal frequency response analysis with multiple load cases, DMP

performance will suffer during MPI communication of the dynamic load matrix.

Avoidance: apply the following DMAP alter:

compile freqrs

alter 'DISUTIL ppfe', '' $

type parm,,i,n,iproc $

iproc=2 $

do while ( iproc<=nproc ) $

disutil ppfe,,,/ppftmp/iproc/-1/10 $ send to master

if ( procid=1 ) then $

add ppfe,ppftmp/ppfx $

if ( iproc=nproc ) then $

equivx ppfx/ppf0/-1 $

else $

equivx ppfx/ppfe/-1 $

endif $

delete /ppftmp,ppfx,,, $ avoid ufm 1126

endif $

iproc = iproc + 1 $

enddo

endalter

1-40553791 2007.0.0 SOL 700 - MATD024 & TABLEDR causes error in d3hsp - TABLEDR has TABLE 0 that was not found

MATD024 & TABLEDR to define strain rate effect causes the following error in

d3hsp.

*** Error DYTRAN Input

TABLEDR has TABLE 0 that was not found.

1-40643851 2007.0.1 SOL 700 - Initial velocity is incorrect if analysis coordinate is defined in GRID

If analysis coordinate of GRID is defined using a local coordinate which is

based on another local coordinate, the initial velocity is incorrect in SOL

700.

For example:

GRID 2 1. 0. 0. 1

TIC 1 2 1 1.

CORD2R 1 2 0. 0. 0. 1. 0. 0.

.707107 .707107 0.

CORD2S 2 0. 0. 0. 0. 0. 1.

1. 0. 45.

1-41448459 2007.1.0 Single Point Constraints - AUTOSPC, INPUTT4 - Incorrect Constraints when negative terms on diagonal

A matrix that is brought in via INPUTT4 and has negative numbers on the diagonal may cause the wrong degrees of freedome to be constrained by the AUTOSPC gpsp module.

1-41585731 2007.0.0 Documentation/QRG - SOL 400 - PARAM,KDIAG

The description for user parameter KDIAG requires updating.

1. It does not include SOL 400 in the list of applicable solution sequences.

2. For SOL 400, it does not apply only to nonlinear statics but to nonlinear transient analysis as well.

Suggested updated description:

Default = -1.0 (SOLs 106, 400 and 153 only)

In SOL 106 (nonlinear static analysis), 400 (both nonlinear static and transient analysis) and 153 (steady state heat transfer), KDIAG may be used to

eliminate spurious mechanisms and singularities in the nonlinear stiffness

matrix. The absolute value of KDIAG will be added to some or all of the diagonal terms in the nonlinear stiffness matrix according to the following:

If KDIAG < 0.0, then add the absolute value of KDIAG to the null diagonal terms

only. (Default)

If KDIAG = 0.0, then no action is taken.

If KDIAG > 0.0, then add the value of KDIAG to all diagonal terms.

1-41885454 2007.0.0 SOL600 - PSHELL, CQUAD4 - Membrane only element incorrectly translated.

In the nastran bulk data a membrane only shell element is defined with a CQUAD4

entry with the MID1 field of the PSHELL entry defined, but MID2, MID3 and MID4

are left undefined. When SOL600 translates this type of element into a Marc

element, it uses type 75, a full shell element. This is incorrect, Marc's membrane-only element is type 18.

1-43440601 2007.0.0 Matrix Methods - DECOMP, Large Models - Signal 11, Overflow

Large dense models over 3 million DOF may cause a signal 11 in DCMP. The error

is related to an integer overflow.

Avoidance: Submit with more or less memory

1-46584431 2007.0.0 SOL 600 - Multiple subcase SPCD Incorrectly Translated

In multiple subcase, the enforced displacement of SPCD+SPC1 with SPC not translated correctly.

For SOL 600 do not enter SPC or SPC1 for dof's where SPCD is specified. For

the MD R2 and MSC.Nastran 2007 releases, if this is done the SPC or SPC1 will

be placed before the SPCD at the same dof in the Marc input so it will be

ignored.

1-46739381 2007.0.0 Matrix Methods - Integer overflows in sparse decomp yields incorrect diagnostic information

There are several places where diagnostics, such as the estimated number of

words in a factor matrix, or the actual number of words in a factor matrix,

exceed the maximum 32-bit signed integer, leading to overflow. The diagnostic

information printed in UIM 4157 is incorrect and can be misleading. In

particular, the MINIMUM MEMORY REQUIREMENT, the MEMORE REQR'D TO AVOID SPILL,

the SPARSE DECOMP MEMORY USED, SPARSE DECOMP SUGGESTED MEMORY, and the time

estimate are incorrect.

1-47446533 2007.0.0 Matrix Methods - DECOMP - signal number 10: bus error in Decomp

Default changes to system 219 may cause models that ran in previous versions to

fail in DECOMP module with the message:

Receiving signal number 10: Bus error

Job aborting...

Avoidances include:

1) set sys219=32

2) set sys206=10

3) increase memory. The recommendation would be to use the value from the UIM 4157:

MEMORY REQR'D TO AVOID SPILL = 20228 K WORDS

and increase it by at least 10%.

1-48629874 2007.0.0 Modal Participation Factors - PFMODE - SFM 4276 (PFCALC)

Jobs using the PFMODE case control command may fail in the PFCALC module with a

SFM 3007 illegal input into mpyad message or a GINO message trying to open a

matrix data block if any grid point resequencing has taken place and the internal grid point order is no longer in external sort. This can occur during

superelement processing for example. There is no known avoidance.

*** SYSTEM FATAL MESSAGE 4276 (QOPEN)

ERROR CODE 1044 PID= 0

*** USER INFORMATION MESSAGE 4276 (QOPEN)

THE DIAG 44 RELATED A NASTRAN DUMP IS SENT TO LOG FILE.

Traceback:

Offset 0x00000110 in procedure gtdens_

Offset 0x00000108 in procedure mpyad_

Offset 0x000002a4 in procedure mpyadk_

Offset 0x000022cc in procedure pfcalc_

Offset 0x000005ec in procedure xsem07_

Offset 0x00000190 in procedure xsemdr_

Offset 0x00000064 in procedure nastmon_

Offset 0x00000adc in procedure mainal

--- End of call chain ---

1-49086447 2007.0.0 Docuementation: QRG Remark 12 for ASSIGN statement.

The following limitation documented in remark 12 of the QRG for the ASSIGN statement was removed in V2005.5.

"Note, however, that the DBLOAD and INPUTT2 modules cannot process input files

in other than the native binary format. That is, a binary file in BIGNENDIAN

format cannot be processed on a LITTLEENDIAN platform and vice-versa".

The MD R2 and MSC.Nastran 2007 QRG has been updated.

1-49118561 2007.1.0 Utilities- Acounting does not work in MD Nastran (acct=yes)

Acounting does not work in MD Nastran (acct=yes). It does work in MSC.Nastran

2005r3.

1-49509805 2007.0.0 SSSALTER - glforce alter gives incorrect results

MSC.Nastran Version 2004 and 2005 versions of the glforce alter give incorrect

answers. In the previous versions KAA was called up with a type,db statement.

In 2004 and 2005 KAA is in the datablock list for the subroutine but not in the

called datablocks. This produces a null datablock and hence incorrect results.

1-49522526 Documentation/QRG - EPOINT documentation error

The Quick Reference Guide indicates that there is a ID limit of

ID<1,000,000

for EPOINTS. This is a typo and should be ID<100,000,000

1-49543841 2007.0.0 SOL 400 - Strain Output is inconsistent.

In SOL 400 total strains need to be converted into True strains to be consistent with other nastran solutions.

1-49693111 2007.1.0 SOL 400 - CQUAD4 - Infinity von MIses stress output for SOL 400 QUAD4 models

The von Mises stresses for CQUAD4 elements in SOL 400 may be output as NaN.

1-50014537 2007.1.0 Multipoint Constraints - Missing UFM 2101 when UWM 2047 is issued

When a datadeck contains a conflict between UM and US membership normally user

fatal message 2101 is issued and the job stops. However when an MPCADD entry

also exists referring to more than 100 nonexisting MPC sets 100 uwm's 2047 are

issued and the job stops without printing the ufm 2101.

1-50098347 Documentation/QRG - File Management Section - Assign Statement documentation is wrong

The QRG documentation for the ASSIGN statement in the File Management section

contains examples for "ASSIGN OP2" that should be "ASSIGN OUTPUT2".

1-50289995 2007.0.0 Utilities - dr3srv build on linux64 crashes

When compiling dr3srv to use DRESP3 entries using the MSC provided makefile

(dr3srv.ksh), the following error will occur.

ld: Warning: size of symbol `main' changed from 128 in

/opt/intel_fc_80/lib/for_main.o to 192 in

/appl/msc.software/msc.nastran/msc20055/linux64/dr3srv.o

/appl/msc.software/msc.nastran/msc20055/linux64/libdr3srv.a(memmgmt.o )(.

text+0x21e2): In function `Get_Temporary_Name':

: the use of `tempnam' is dangerous, better use `mkstemp'

/opt/intel_fc_80/lib/for_main.o(.text+0x42): In function `main':

: undefined reference to `MAIN__'

make: *** [dr3serv] Error 1

===

Resolution:

Modify dr3srv.ksh to include "-nofor_main". The build script will look like

this for the linux64 section:

linux64 )

targets="CC=/opt/intel_cc_80/bin/icc

FC=/opt/intel_fc_80/bin/ifort"

FFLAGS="-nbs -w -w90 -cm -WB -pad_source -W0 -save -zero -Vaxlib -ftz" export FFLAGS

LDFLAGS="-nofor_main -Vaxlib"

export LDFLAGS

;;

1-50337802 2007.1.0 Case Control - Input error leads to misleading UFM 392 (XSORSO) and UFM 9002 (IFPL)

When a FREQ1 or other bulk data entry which begin in the first column has been

erroneously put into the case control deck the following error occurs:

*** USER FATAL MESSAGE 392 (XSORSO)

THE AUXMID OR SEID ON THE FOLLOWING BEGIN BULK COMMAND IS NOT GREATER THAN

0.

and at the end of the f06 file:

^^^ USER FATAL MESSAGE 9002 (IFPL)

^^^ ERROR(S) ENCOUNTERED IN THE MAIN BULK DATA SECTION

^^^ SEE MESSAGES ABOVE. ERROR ENCOUNTERED IN MODULE XSORT.

These error messages are misleading. Normally when an illegal case control

command is specified the following error message will be issued:

*** USER FATAL MESSAGE 601 (IFP1D)

THE KEYWORD ON THE ABOVE CARD TYPE IS ILLEGAL OR MISSPELLED.

Attached is a data deck which shows the problem.

1-50362721 2007.0.0 Mass Matrix - NSM, NSM1 - Wrong Answers

In a very large model with 6 million degrees of freedom which included correspondingly large NSM sets, the non structural mass included in the analysis was truncated leading to wrong answers.

1-50504311 2007.1.0 XYPLOT, XYPUCH - Infinite CPU loop for XYPUNCH request with an illegal item code

If an xyplot or xypunch request is made for an invalid element code, the program may go into an infinitel cpu loop.

An avoidance is to supply YMIN and YMAX before the XYPUNCH command. YMIN and

YMAX are for ploting, and should not be needed for XYPUNCH.

1-50605180 2007.0.0 SOL 600 - MAT9, MATORT - solids/shells cannot reference cylindrical CS for material CS

In SOL 600, solid element material properties may only reference a single rectangular coordinate system for the enitire model. Shell elements may reference multiple rectangular coordinate systems.

1-50608531 2007.0.0 SOL 400, 600 - Multiple cracks using same VCCT case control ID - UFM 311

Multiple VCCT cracks, such as "VCCT,1,1,...." and "VCCT,1,2,...." on the same

VCCT Case Control command results in the following fatal message:

*** USER FATAL MESSAGE 311 (IFPDRV)

NON-UNIQUE FIELD 2 ON BULK DATA ENTRY VCCT 1 SORTED ENTRY COUNT =

5036

1-50617151 2007.0.0 Rotordynamics - UFM 3032 (CAMPREP) generating Campbell Diagram

Rotordynamics analysis may fail when generating the Campbell diagram with the

following message:

*** USER FATAL MESSAGE 3032 (CAMPREP)

UNABLE TO FIND SELECTED SET ( 301) IN TABLE (DDVAL ) IN SUBROUTINE (NO_DDVAL_SELECTED).

0FATAL ERROR

1-50698031 2007.0.0 Matrix Methods - Floating Point exception in sparse decomp

Sparse decomp may crash with a floating point exception

Signal received: SIGTRAP - Trace trap

Signal generated for floating-point exception:

FP invalid operation

Traceback:

Offset 0x00000038 in procedure tmgino_

Offset 0x000012e8 in procedure dfmsym_

Offset 0x00001168 in procedure dfmsa_

Offset 0x00000134 in procedure sdcomp_

Offset 0x00000a88 in procedure facdrvo_

Offset 0x00000d10 in procedure facdrv_

Offset 0x000010f4 in procedure reigla_

Offset 0x00001f1c in procedure lnnrigl_

Offset 0x00003d60 in procedure reig_

Offset 0x000001b0 in procedure xsem06_

Offset 0x00000184 in procedure xsemdr_

Offset 0x00000064 in procedure nastmon_

Offset 0x00000adc in procedure mainal

--- End of call chain ---

The problem has been traced to an integer overflow in the routine DFMSA.

1-50698089 2007.0.0 Complex Eigenvalues - HESS - Illegal argument to DGEGV when using QZ HESS

When using QZ HESS in complex eigenvalue analysis, if more than 4 Gb of memory

is given and if the problem is too large to fit in core, the eigenvalue analysis is attempted, leading to an error message from the LAPACK routine

DGEGV (or ZGEGV if the matrices are complex).

Avoidance: An avoidance for v2005.5+ is to specify mode=i8.

1-50714931 2007.1.0 SOL 600 - BCPARA, GP1 - Marc Translator error

The following input bulk data error was not trapped in IFP and caused nastran

to fail in GP1 as shown below.

BCPARA,ERROR,.010

should have been

BCPARA,,ERROR,.010

forrtl: severe (64): input conversion error, unit -5, file Internal Formatted

Read

The same job aborted on Linux dmp=4 with the following error...

forrtl: severe (64): input conversion error, unit -5, file Internal Formatted

Read

time: error waiting for child process: No child processes

1-50779321 2007.0.0 Dynamics - PARAM,AUTOQSET, Part Superelements - SFM 6144

If PARAM,AUTOQSET,YES is specified with part superelements and there are SPCi

specified in part superelement bulk data sections then the job may fail with

something similar to:

*** SYSTEM FATAL MESSAGE 6143 (UMRG1PR)

THE SIZES OF THE INPUT MATRICES AND THE DOF SETS ARE INCOMPATIBLE. SPECIFICALLY:

The number of columns in KSF is not equal to the size of the COMP-set User Information: Size of input matrices and DOF sets:

KSF : Rows= 12 by Cols= 60 Set sizes: Major (F-set)= 167

Set0 (COMP-set)= 68

Set1 (Q-set)= 99

Avoidance: Insert the following DMAP alter (which also avoids CR

1-50779328)

compile phase0

alter ' bndspc '(,-1)

if ( seid=0 ) call dbstore ysd,,,,//0/0/' '/0 $

compile extduset

alter 'xemap\/emap'

call dbstore xemap,,,,//0/0/' '/0 $

compile augqset

alter 1

call dbfetch /xemap,ysd,,,/0/0/0/0/0 $

alter 'gp4 '

bndspc xemap,uset0,bgpdt,,ysd/

uset01,ysd1/

seid/0 $

equivx uset01/uset0/-1 $

compile phase1dr

alter 1

type db kqqu,mqqu,bqqu,k4qqu,pqu,rvqu,aqu,phbqu,

gpqku,gdqku,sdsrqu $

1-50779728 2007.0.0 Dynamics - PARAM,AUTOQSET, multilevel superelement trees - SFM 6144 or Wrong Answers

If PARAM,AUTOQSET,YES is specified with multilevel superelement trees with

branches longer than one superelement then the job may fail with something similar to:

*** SYSTEM FATAL MESSAGE 6144 (MERGE1PR)

THE SIZES OF THE INPUT MATRICES AND PARTITIONING VECTORS ARE INCOMPATIBLE.

SPECIFICALLY:

The number of columns in MTQ is not equal to the number of non-zeros in

partitioning vector VQ

User Information: Size of input matrices and partitioning vectors: MTQ : Rows= 12 by Cols= 13 VQ : Rows= 105 no. of

non-zeros=

35 no. of zeros= 70

Avoidance: Insert the following DMAP alter (which also avoids CR

1-50779321)

compile phase0

alter ' bndspc '(,-1)

if ( seid=0 ) call dbstore ysd,,,,//0/0/' '/0 $

compile extduset

alter 'xemap\/emap'

call dbstore xemap,,,,//0/0/' '/0 $

compile augqset

alter 1

call dbfetch /xemap,ysd,,,/0/0/0/0/0 $

alter 'gp4 '

bndspc xemap,uset0,bgpdt,,ysd/

uset01,ysd1/

seid/0 $

equivx uset01/uset0/-1 $

compile phase1dr

alter 1

type db kqqu,mqqu,bqqu,k4qqu,pqu,rvqu,aqu,phbqu,

gpqku,gdqku,sdsrqu $

1-50888831 2007.0.0 Rotordynamics - RSPINR - ROTOR superlement with structural damping, GR, gives wrong answers

A rotordynamics superlement analysis with structural damping (GR) specified on

the RSPINR entry will yield wrong answers.

1-50916991 2007.1.0 Optimization/Design Sensitivity - DRESP1, DESSUB, DESOBJ - SFM

If a DRESP1 entry with RTYPE = RMSxxxx or PSDxxxx is selected by a DESSUB or

DESOBJ entry that is in a subcase other than the first subcase referenced on

the RANDPS entry iinvoked by the DRESP1, a system fatal message will occur.

User information: RMS or PSD responses in SOL 200 that are created using the

DRESP1 entry can span multiple subcases based on the RANDPS entry that is

invoked by the DRESP1 entry. Case control reference (DESSUB/DESOBJ) can only

be from the first subcase selected on the RANDPS entry.

1-50984175 2007.0.2 SOL 600 - PLOAD - Possible wrong answers

It is not recommended that PLOAD be used in SOL 600. All PLOAD entries should

be changed to PLOAD4 entries.

The PLOAD sign convension is different in NASTRAN than MARC. Nastran assumes

positive pressure to be acting in the positive element normal direction, whereas marc assumes that positive pressure is acting in the direction opposite

to the element normal ( ie into the element).

1-51008491 2007.1.0 Restart - enforced motion - SFM 6144

If a restart is performed on an enforced motion restart then the following error may occur:

*** SYSTEM FATAL MESSAGE 6144 (PARTN1)

THE SIZES OF THE INPUT MATRICES AND PARTITIONING VECTORS ARE INCOMPATIBLE.

SPECIFICALLY:

The number of rows in DAY is not equal to the number of rows in the row

partitioning vector VYA

User Information: Size of input matrix and partitioning vectors: DAY : Rows= XXX by Cols= YYY

VYA : Rows= ZZZ

Avoidance: Insert the following DMAP alter (any version or Nastran)

compile getay

alter 'fbs.*lyy,,kay1',''(,11)

fbs lyy,,kay1/day0//-1 $

if ( nullvay>-1 ) then $

merge day0,,,,,vay/day1/1 $

else if ( nullvya>-1 ) then $

partn day0,,vya/day1,,,/1 $

else

equivx day0/day1/-1 $

endif $

if ( novafs>0 ) then $

merge day1,,,,,vafs/day/1 $

else $

equivx day1/day/-1 $

endif $

endalter

1-51035307 2007.1.0 Superelements - param,extout with

param,autoqset results in UFM 3001 in GP4

Using param,autoqset will result in the following fatal message when used in

combination with param,extout.

*** SYSTEM FATAL MESSAGE 3001 (GP4)

THE INPUT DATA BLOCK NAMED EQEXINX AT POSITION 3 DOES NOT EXIST.

USER INFORMATION: THIS ERROR IS CAUSED BY ONE OF THE FOLLOWING:

Avoidance: 1. Use the case control command EXTSEOUT

or

2. Use the following alter

compile extout

alter 'if ( atqset','' $

if ( atqset and extseout>0 ) then $

1-51128594 2007.0.2 SOL 600 - Submittal on Linux IA64 may fail to find marc executable

SOL 600 jobs in MSC.Nastran 2005r2 on Linux IA64 may fail to find marc executable and may fail with the message:

Machine architecture to use comes from

MSC_ARCHM=linux_rh9

Check default script

/opt/cae/msc/msc20051/marc/linux_rh9/marc2005/tools/run_marc

Check default script

/opt/cae/msc/msc20051/marc/linux_rh9/tools/run_marc

Check default script

/opt/cae/msc/msc20051/marc/linux_rh9/marc91/tools/run_marc

Check default script

/opt/cae/msc/msc20051/marc/linux_rh9/marc2006/tools/run_marc

Check default script

/opt/cae/msc/msc20051/marc/linux_rh9/marc2007/tools/run_marc

Check default script

/opt/cae/msc/msc20051/marc/linux_rh9/marc2008/tools/run_marc

Check default script

/opt/cae/msc/msc20051/marc/linux_rh9/marc2009/tools/run_marc

** Severe Marc Translator Warning ** Script to run Marc not in expected

directory

/opt/cae/msc/msc20051/marc/linux_rh9/marc2005/tools/run_marc

1-51152461 2007.1.0 Documentation/SOL 600 - BCPARA,FTYPE - Incorrect Documented Default Value

The type of inte QRG will be fixed - the default will be changed to 0 instead of 2 - Ed Dickerson 2/22/2007

In SOL 600, NLTRAN, the documented efault of BCPARA-FTYPE is incorrect. The

default is 0 not 2.

1-51495308 2007.1.0 Optimizaton/Design Sensitivity - EXTSEOUT - CSUPER - ufm 5423 (MPYAD)

In sol 200 when using external superelements which refer to CSUPER cards the

following error may occur:

*** USER FATAL MESSAGE 5423 (MPYAD)

ATTEMPT TO MULTIPLY INCOMPATIBLE MATRICES

FILE# COLS ROWS

FORM TYPE NZWD DENS

TRAILER FOR SCRATCH IS 301 55182 15

2 2 6 1324

TRAILER FOR PXG IS 101 1 1872

2 2 1248 3333

TRAILER FOR (NONE) IS 0 0 0

0 2 0 0

TRANSPOSE FLAG IS 0

Avoidance: use the following DMAP alter for 2005r3 and 2006:

compile EXTIN $

alter 'DBSTATUS X_K' $

if (nokaa>0 and iostat=0 ) then $

EQUIVX X_K /KXX /-1 $

EQUIVX X_M /MXX /-1 $

EQUIVX X_B /BXX /-1 $

EQUIVX X_K4/K4XX/-1 $

EQUIVX X_P /PX /-1 $

EQUIVX X_V /VX /-1 $

EQUIVX X_GP/GPX /-1 $

EQUIVX X_GD/GDX /-1 $

EQUIVX X_VF/VXFS/-1 $

EQUIVX X_A /AX /-1 $

return

endif

alter 'if ( nouset',''

if ( nouset>0 and not(exter) ) then $

COMPILE spdr1

alter 'PEID=SEID' $

type parm,,i,n,np2 $

type parm,nddl,i,n,desiter $

np2 = desiter $

if ( peid>0 ) desiter = 0 $

alter 'NOASET=LUSETS' $

if ( peid>0 ) desiter = np2 $

COMPILE phase0

alter 'SELIST=(NOSELIST>0)','' $

SELIST=(auxmid<1 and NOSELIST>0) $

COMPILE phase1dr

alter 'SEP2DR SLIST' $

if ( auxmid>0 ) noup = -1 $

alter 'IF ( NOKAA','' $

if( nokaa<1 or descycle>1 ) then $

and use the following DMAP alter for 2007:

compile EXTIN $

MSC_Nastran模块介绍_2012

MSC Nastran 模块功能介绍 1.MSC Nastran Basic 1003 (License文件中的授权特征名:NA_NASTRAN) MSC Nastran基本模块,功能包括线性静力分析、模态分析及屈曲分析。MSC Nastran 基本模块求解规模无节点限制,可对多种单元、材料、载荷工况进行评估,实现线性静力分析(包括屈曲分析)和模态分析(包含流固偶合即虚质量方法和水弹性方法)。线性静力分析,预测结构在静力条件下的线性响应(位移、应变、应力),即小变形和不考虑非线性因素的情况,包括屈曲分析(稳定性分析)。模态分析能了解结构的固有频率(振动模态)特征,帮助评估结构的动力特性。 2. MSC Nastran Dynamics 1025 (License文件中的授权特征名:NA_Dynamics) 结构动力学分析是MSC Nastran的主要强项之一,它具有其它有限元分析软件所无法比拟的强大分析功能。MSC Nastran动力学分析功能包括: 正则模态,复特征值分析,频率及瞬态响应分析,随机响应分析,冲击谱分析等。 3. MSC Nastran Connectors 10002 (License文件中的授权特征名: NA_Connectots) MSC Nastran连接单元,可以模拟点焊,铆接,螺栓连接等。允许创建点-点,点-面,面-面连接。可以用焊接单元将任意的两个部件的网格连接在一起,并自动处理与任意类型单元之间的连接。 4. MSC Nastran ADAMS Integration 10233 (License文件中的授权特征名: NA_ADAMS_Integration) MSC Nastran 与ADAMS的接口,使用ADAMS进行柔性体分析时,需导入MSC Nastran计算所生成的模态中性文件,MSC Nastran ADAMS Integration可使MSC Nastran 计算生成ADAMS所需要的柔性体模态中性文件。 5. MSC Nastran DMAP 1024 (License文件中的授权特征名:NA_DMAP) 作为开放式体系结构,MSC Nastran的开发工具DMAP语言 (Direct Matrix Abstraction Program)有着40多年的应用历史。一个DMAP模块可由成千上万个FORTRAN子程序组成,并采用高效的方法来处理矩阵。实际上MSC Nastran是由一系列DMAP子程序顺序执行来完成求解任务的。用户可利用DMAP编写客户化的程序,形成自己的求解序列来操作数据库与数据流。 6. MSC Nastran Heat Transfer 1023 (License文件中的授权特征名:NA_Thermal) MSC Nastran热分析模块。热分析通常用来校验结构零件在热边界条件或热环境下的产品特性,利用MSC Nastran可以计算出结构内的热分布状况,并直观地看到结构内潜热、热点位置及分布。用户可通过改变发热元件的位置、提高散热手段、绝热处理或用其它方法优化产品的热性能。 7. MSC Nastran SMP 1030 (License文件中的授权特征名:NA_SMP) MSC Nastran共享内存并行计算,通过单机多CPU并行计算技术,用来实现大模型的求解,缩短计算时间,提高分析效率。

MSC.Nastran HPC解决方案

MSC.Nastran HPC解决方案9/20/2018

Agenda 1 1.MSC.Nastran文件、内存管理系统介绍 2.HPC中计算分析介绍 a)MSC Nastran SMP和DMP方法应用场景介绍; b)并行迭代求解:CASI设置 c)Pardiso求解应用介绍 d)自动部件模态综合法(ACMS)应用介绍; i.阻尼定义、快速频响分析; ii.频变单元与求解速度; iii.外声场分析,弱耦合分析介绍,一体化动力系统声辐射分析应用优势; iv.自动化选择求解介绍 e)模态综合法(CMS)应用介绍,加速计算优势,振动能量 f)优化方法(SOL 200)加速能力介绍 g)基于重启动NVH性能分析加速介绍 3.MSC.Nastran过程文件解读 a)F04、log文件解读 b)F06 reader应用介绍 4.MSC.Nastran HPC计算常用参数配置介绍

1. 内存 ?MEMORY=MAX ?系统文件缓存区域

MSC.Nastran如何调用系统内存 ?多少内存被系统调用 ?F04有被调用内存总结 ?该作用内存设置为:memory=max ?Nastran buffsize=32579

2. HPC 计算分析介绍 a)MSC Nastran SMP和DMP方法应用场景介绍; b)并行迭代求解:CASI设置 c)Pardiso求解应用介绍 d)自动部件模态综合法(ACMS)应用介绍; i.阻尼定义、快速频响分析; ii.频变单元与求解速度; iii.外声场分析,弱耦合分析介绍,一体化动力系统声辐射分析应用优势; iv.自动化选择求解介绍 e)模态综合法(CMS)应用介绍,加速计算优势, 振动能量 f)优化方法(SOL 200)加速能力介绍 g)基于重启动NVH性能分析加速介绍

MSC_Nastran

MSC.Nastran 介绍
全球功能最强、应用最为广泛的有限元分析软件
MSC.Software 公司自 1963 年开始从事计算机辅助工程领域 CAE 产品的开发和研究。在 1966 年,美国国家航空航天局(NASA)为了满足当时航空航天工业对结构分析的迫切需求, 招标开发大型有限元应用程序,MSC.Software 一举中标,负责了整个 NASTRAN 的开发过程。 经过 40 多年的发展,MSC.Nastran 已成为 MSC 倡导的虚拟产品开发(VPD)整体环境最主要的 核心产品, MSC.Nastran 与 MSC 的全系列 CAE 软件进行了有机的集成, 为用户提供功能全面、 多学科集成的 VPD 解决方案。 MSC.Nastran 是 MSC.Software 公司的旗舰产品,经过 40 余年的发展,用户从最初的航 空航天领域,逐步发展到国防、汽车、造船、机械制造、兵器、铁道、电子、石化、能源材 料工程、科研教育等各个领域,成为用户群最多、应用最为广泛的有限元分析软件。 MSC.Nastran 的开发环境通过了 ISO9001:2000 的论证, MSC.Nastran 始终作为美国联邦 航空管理局(FAA)飞行器适航证领取的唯一验证软件。在中国,MSC 的 MCAE 产品作为与压力 容器 JB4732-95 标准相适应的设计分析软件, 全面通过了全国压力容器标准化技术委员会的 严格考核认证。另外,MSC.Nastran 是中国船级社指定的船舶分析验证软件。
赛车部件分析
ISO9001:2000 论证通过证书
一.MSC.Nastran 的特色
极高的软件可靠性,经过无数工程问题的验证 独特的结构动力学分析技术 完整的非线性求解技术 高效率的大型工程问题求解能力 – ACMS 方法 针对大型问题的优化技术和设计灵敏度分析技术 高度灵活的开放式结构,功能独特的用户化开发工具 DMAP 语言 独特的空气动力弹性及颤振分析技术
1

有限元分析软件MSC.NASTRAN

MSC.NASTRAN 目录 1 简介 2 MSC.Nastran的开发历史 3 MSC.NASTRAN的优势 3.1 极高的软件可靠性 3.2 优秀的软件品质 3.3 作为工业标准的输入/输出格式3.4 强大的软件功能 3.5 高度灵活的开放式结构 3.6 无限的解题能力 4 NASTRAN动力学分析功能 4.1 NASTRAN动力学分析简介 4.2 正则模态分析 4.3 复特征值分析 4.4 瞬态响应分析(时间-历程分析) 4.5 随机振动分析 4.6 响应谱分析 4.7 频率响应分析 4.8 声学分析 5 NASTRAN的非线性分析功能 5.1 NASTRAN非线性分析简介 5.2 几何非线性分析 5.3 材料非线性分析 5.4 非线性边界(接触问题) 5.5 非线性瞬态分析 5.6 非线性单元 6 NASTRAN的热传导分析 6.1 NASTRAN热传导分析简介 6.2 线性/非线性稳态热传导分析 6.3 线性/非线性瞬态热传导分析 6.4 相变分析 6.5 热控分析 6.6 空气动力弹性及颤振分析 6.7 流-固耦合分析 6.8 多级超单元分析 6.9 高级对称分析 7 设计灵敏度及优化分析 7.1NASTRAN的拓扑优化简介 7.2 设计灵敏度分析 7.3 设计优化分析 7.4 拓扑优化分析 8 复合材料分析 9 P-单元及H、P、H-P自适应

10 NASTRAN的高级求解方法 11 NASTRAN的单元库 12 用户化开发工具DMAP语言 1 简介 2 MSC.Nastran的开发历史 3 MSC.NASTRAN的优势 3.1 极高的软件可靠性 3.2 优秀的软件品质 3.3 作为工业标准的输入/输出格式3.4 强大的软件功能 3.5 高度灵活的开放式结构 3.6 无限的解题能力 4 NASTRAN动力学分析功能 4.1 NASTRAN动力学分析简介 4.2 正则模态分析 4.3 复特征值分析 4.4 瞬态响应分析(时间-历程分析) 4.5 随机振动分析 4.6 响应谱分析 4.7 频率响应分析 4.8 声学分析 5 NASTRAN的非线性分析功能 5.1 NASTRAN非线性分析简介 5.2 几何非线性分析 5.3 材料非线性分析 5.4 非线性边界(接触问题) 5.5 非线性瞬态分析 5.6 非线性单元 6 NASTRAN的热传导分析 6.1 NASTRAN热传导分析简介 6.2 线性/非线性稳态热传导分析 6.3 线性/非线性瞬态热传导分析 6.4 相变分析 6.5 热控分析 6.6 空气动力弹性及颤振分析 6.7 流-固耦合分析 6.8 多级超单元分析 6.9 高级对称分析 7 设计灵敏度及优化分析 7.1NASTRAN的拓扑优化简介 7.2 设计灵敏度分析 7.3 设计优化分析 7.4 拓扑优化分析 8 复合材料分析

(完整word版)计算机应用基础心得体会

计算机应用基础心得体会 计算机应用基础课程的教学涉及到诸多方面的知识,需要我们不断地探索新的教学方法和教学模式,激发学生对学习该课程的兴趣,使学生不但掌握书本上的知识,而且熟练操作技能。下面是计算机应用基础教学心得体会,希望对大家有帮助。 计算机应用基础心得体会篇一现阶段的五年制高职学生,都是90后,而计算机作为信息时代的主要载体和工具,正担负着越来越重要的作用,他们早在初中甚至小学阶段已经接触过。如今作为一门五年制高职的课程,计算机应用基础在各级各专业的开设成为必需,而且由于计算机教育贴近现实,有着其他课程无可比拟的可操作性、实用性、实效性;作为素质教育的一环,在素质教育中占据了极其重要的地位。如何上好计算机应用基础课?让每位同学通过这个课程的学习后,最起码能考取全国计算机等级考证的一级证?这是我们计算机基础教师要思考的。 以下是结合我的教学经验,在2012年--2013年第一学期的《计算机应用基础课程》的教学中的一点心得: 1、为学生创设良好的学习情境。在计算机基础的教学中,学生的学习环境往往会不同程度地影响学生的学习态度、学习兴趣以及最终的学习效果。因此,在平时教学中,我力求为学生创设一个轻松愉快而又有助于学生理解、运用知识的学习情境。如:每次上课时,我

首先会向学生展示案例的效果,将课前精心准备好的PPT文稿式样用计算机演示出来,告诉学生这就是他们将要学习的而且要求每人完成的,以增进学生一些感性上的认识,让他们有个准备。 2、设立互助小组,组织学生讨论:我们需要明确的是为什么要学习该课程呢?在当今这样一个信息飞速发展、迅速传递的信息时代,不掌握一定的信息技术,也就不能够抓住快速传递的信息的能力,势必会被时代所淘汰。因此每位学生无论是哪个专业都应该初步掌握使用计算机技术去获取信息、处理信息的能力。 计算机应用基础课程能教会学生编辑排版文章、处理表格,甚至图形等,学生往往觉得很有用、很有趣。我便组织学生讨论,结合学习过度共同探讨,利用计算机可以做一些什么事?又决定做些什么事? 3、激发学生的学习兴趣。学习兴趣,是学生学习和掌握知识的动力和源泉。在计算机应用基础的教学中充分激发学生学习知识的兴趣,是我们计算机教师在组织教学过程中首要的任务。而如何激发学生学习兴趣,关键在于让学生觉得他们所学的东西有用有价值,一方面要逐步满足学生的好奇心理,另一方面要让学生有更多尝试和实践的机会。我发现,一旦学生对学习内容感兴趣的话,他们就会锲而不舍地钻研下去,以致掌握熟练的操作技能。 实践证明,这种做法有助于增进学生之间的情感交流,培养学生合作学习的能力,激发学生学习的乐趣,这些作用往往是教师所无法取代的。 4、鼓励学生学以致用。结合实用需求,讲解课本外的计算机知识.

MSC_Nastran

The Effects of Forming and Parameter Mapping on Further Simulation Brian Cowell Tower Automotive Technical Center 3533N.27th Street Milwaukee,WI53216 (414)447-4608 cowell.brian@https://www.wendangku.net/doc/f117030019.html, Anthony Kellicut Tower Automotive Adam Fisher Tower Automotive Keywords: Crash,Dynain,Hydroforming,Meshing

ABSTRACT This paper describes the effects of forming simulation results on crash and durability performance and the impact of the method of transferring results from one simulation to the next.Forming simulation may not always result in a mesh that is ideally suited for static or crash analysis.Tower Automotive has developed software to map forming simulation results from the formed mesh to an entirely different LS-DYNA or NASTRAN mesh of the same part. Simulations of part fabrication represent both hydroforming and mechanical forming.Static simulation is performed in NASTRAN using the work-hardened state as the material input for each element.Other formed parts are subjected to a representative crush load.The effect of transferring results on the same mesh and mapped onto a dissimilar mesh is compared. Results of several crush simulations will be shown,including with forming results,without forming results,and forming results mapped onto a different mesh. BACKGROUND Forming operations for metal parts can dramatically alter the material properties of the part. Inclusion of the changes in the properties can be critical for later simulations.LS-DYNA provides a simple means of transferring elemental thicknesses,residual stresses,and plastic strains from one simulation to another,the DYNAIN file.However,it can be somewhat limiting.Basic trimming of the formed part can be done using LS-DYNA or by manually removing elements from the formed mesh.The resulting mesh around holes and edges may not be high in quality.The resulting mesh may not line up nicely for welding of brackets or other components.Having an independent mesh optimized for the next simulation with brackets attached and holes treated properly could improve the accuracy of any simulation, with or without the forming effects considered.By including the forming effects on a well-conditioned mesh,we can get the best of both worlds. OBJECTIVES The objective of the study was to discover the impact of parameter mapping on further simulation.The primary focus has been on crash simulation due to the dramatic effect work hardening from forming has on the crash performance of a part,as shown previously[1]. APPROACH A hypothetical hydroformed frame rail crush initiator was used for the crash study. Expansion was7.9%.The material used was mild steel with a yield point of296Mpa(43 ksi).The rail section measured roughly51mm(2”)wide by152mm(6”)tall by305mm (12”)long.Forming simulations were conducted with two different element densities. Adaptive remeshing was not employed.The coarse tube model had2,500elements and the fine model had10,000elements.Minimum thickness after forming was2.58mm with the coarse model and2.55mm with the fine model.The mapping target mesh had5,156 elements.The DYNAIN files from the coarse and fine forming simulations were mapped onto the map target mesh.The original DYNAIN meshes,the two mapped meshes,the map target mesh,and the DYNAIN mesh shapes without forming effects were then impacted by a rigid plate.The plate had a mass of170kg and an initial velocity of11.2m/s(25mph). Figures one and two show the thickness distribution after forming of the coarse and fine mesh models.The finer model thins out slightly more in the corners because it stretches to fill the form better than the coarse elements can.Figures three and four are the effective plastic strain after forming.Again,the finer model peaks more in the corners than the coarse mesh

学习计算机应用基础的心得

学习计算机应用基础的心得 为了提高自身的计算机管理业务素质,促进信息技术教学工作的顺利开展,我于2008年3月份在中小学继续教育网上选学了《计算机应用基础》的课程学习。这次培训非常适合我们农村中小学教师专业发展的需要、它给了我们一个掌握现代教育媒体技术的好机会。当前,计算机行业是个飞速发展的行业,日新月异,因此,不断加强理论学习,拓展知识领域,进行知识更新,是我们当前最为迫切的任务。由于我们农村教师长年工作在教学一线,工作任务繁重,没有时间外出参加培训活动,需要一种能够适合个人工作形式的培训方式,中欧项目为广大农村教师提供了这样一个场所,在这个场所里,教师可以借助配置的学习资源和自身的经验,开展有组织、以自学为主的培训,提高自己的教育教学能力。正是在这样的背景下上级部门组织了这一次学习。 培训中我们学习了以下这样一些知识内容:1、计算机的基础; 2、计算机的硬件安装与维护; 3、系统软件的安装与维护; 4、办公软件OFFICE、WORD、EXCEL、POWERPOINT等常用的几种软件和应用技巧; 5、网络的维护;6、卫星接收;7、光盘刻录。 虽然这次培训的时间很短,但对我来说受益匪浅,以这次培训为契机,积极接收新的教育教学理念,更新了观念,开阔了教学研究的视野,充分认识到了现代教育教学媒体的特点和重要性。主要有以下这几个方面的体会:

1、培训学习让我了解了计算机的硬件与系统软件的安装、维护知识。在学习这一部分内容时授课老师深入浅出,让我们自己积极动手操作,结合实践来提高自己的操作能力,使每个学员得到了一次锻炼的机会。 2、学习了常用的办公软件,主要有OFFICE、WORD、EXCEL、POWERPOINT等,以及常用的几种软件的应用技巧,同时也学习了一些解决实际应用过程中经常出现的问题的方法,相信这次学习,会让我在今后的工作中运用电脑时能够得心应手。 3、在我们农村小学,大家对网络方面的知识较为贫乏,大多数人还从未接触过网络知识,还不能超前地认识到网络带来的好处。因此为了提高大家的认识,老师不仅采用实物演示的办法,而且还为我们提供实践操作的机会来为大家讲解有关组建局域网以及网络维护方面的知识,介绍了一些平时我们很少用到的网络检测命令,对我今后维护学校自己的局域网络有很大的帮助。在整个学习过程中我始终认真学习,把知识及时作以整理和复习,以便提高自身的知识水平和教学能力,以适应信息时代对我们教育工作者的要求。 计算机知识更新是很快的,随着教育体制的改革和教育理念的更新,以及信息技术的飞速发展,如何接受新的教育理念,转变我们传统的教育观念,来充实我们的专业技能,已经成为我们每一个教育工作者必须要解决的第一个问题。只有不断地学习,才能掌握最新的知识,把工作做得更好。我们也渴望能够参加更多的这类培训活动,以

nastran与ansys的优缺点对比

nastran在美国用的特别多,在美国的航空航天领域,ansys几乎无人问津。nastran功能非常丰富:关于NX Nastran的高级非线性分析功能 NX Nastran高级非线性分析的主要功能有: 表面接触: ν壳单元和实体单元表面接触 ν单面和双面接触 ν自接触 ν多个摩擦模型 ν约束接触 ν多种接触算法 ν金属成形刚性目标接触 ν柔性接触 ν接触表面偏移 ν间隙单元 ν接触压力和作用力结果 几何非线性: ν大尺寸变形 ν大尺寸应变 突弹跳变分析(后屈曲) 随动力 材料的非线性: ν超弹性-Mooney-Rivlin模型 ν垫圈材料模型 ν垫圈压力和状态结果 ν非线性弹性 ν弹塑性 ν热弹塑性 ν弹性蠕变 ν塑性 νVon Mises 屈服准则 ν各向同性硬化 ν运动硬化 ν混合硬化 ν破裂 ν应变测量:工程,Green,对数 ν应力测量:工程,Cauchy 强健的求解方法: 全牛顿迭代方法,使用或者不使用线性搜索

ν载荷位移控制(LDC)方法 ν自动时间步长(ATS)方法 ν低速动力学效应选项 ν能量、作用力和变形收敛准则 ν直接隐式积分采用Newmark数值方法动态求解 ν稀疏解算器和迭代多网格解算器 ν用于静态解的刚度稳定 方便的线性到非线性分析的转换: ν在线性模型中只增加少量非线性特定条目 ν输入和输出格式类似 ν 支持许多高级NX Nastran功能: ν弹性各向同性,正交异性材料 ν复合材料 ν平面应变建模 ν材料温度依附性 支持许多载荷条件: ν集中载荷 ν随动力载荷 ν压力和分布载荷 ν惯性载荷 ν强迫运动 ν作用温度 ν位移、速度和温度的初始条件 显式非线性求解器: 除常用的隐式求解器外,NX Nastran 还提供适合瞬时、动态非线性分析的显式求解器。 Adina:NX Nastran强大的非线性求解技术来自著名的非线性软件ADINA,且无缝集成。用户可以在NX Nastran中轻松实现Adina 的非线性功能,而不必掌握Adina的操作界面。 因为和NASA的特殊关系,mscnastran在航空航天领域有着崇高的地位。ANSYS软件是融结构、流体、电场、磁场、声场分析于一体的大型通用有限元分析软件。由世界上最大的有限元分析软件公司之一的美国ANSYS开发,在铁道,建筑和压力容器方面应用较多。它能与多数CAD软件接口,实现数据的共享和交换,如Pro/Engineer, NASTRAN, Alogor, I-DEAS, AutoCAD等,是现代产品设计中的高级CAD工具之一。软件主要包括三个部分:前处理模块,分析计算模块和后处理模块。分析计算模块包括结构分析(可进行线性分析、非线性分析和高度非线性分析)、流体动力学分析、电磁场分析、声场分析、压电分析以及多物理场的耦合分析,可模拟多种物理介质的相互作用,具有灵敏度分析及优化分析能力;

计算机应用基础的课程学习心得体会

计算机应用基础的课程学习心得体会为了提高自身的计算机管理业务素质~促进信息技术教学工作的顺利开展~我于2008年3月份在中小学继续教育网上选学了《计算机应用基础》的课程学习。这次培训非常适合我们农村中小学教师专业发展的需要、它给了我们一个掌握现代教育媒体技术的好机会。当前~计算机行业是个飞速发展的行业~日新月异~因此~不断加强理论学习~拓展知识领域~进行知识更新~是我们当前最为迫切的任务。由于我们农村教师长年工作在教学一线~工作任务繁重~没有时间外出参加培训活动~需要一种能够适合个人工作形式的培训方式~中欧项目为广大农村教师提供了这样一个场所~在这个场所里~教师可以借助配置的学习资源和自身的经验~开展有组织、以自学为主的培训~提高自己的教育教学能力。正是在这样的背景下上级部门组织了这一次学习。 培训中我们学习了以下这样一些知识内容:1、计算机的基础, 2、计算机的硬件安装与维护, 3、系统软件的安装与维护, 4、办公软件OFFICE、WORD、EXCEL、POWERPOINT等常用的几种软件和应用技巧,5、网络的维护, ,、卫星接收,,、光盘刻录。 虽然这次培训的时间很短~但对我来说受益匪浅,以这次培训为契机~积极接收新的教育教学理念~更新了观念~开阔了教学研究的视野~充分认识到了现代教育教学媒体的特点和重要性。主要有以下这几个方面的体会: 1、培训学习让我了解了计算机的硬件与系统软件的安装、维护知识。在学习这一部分内容时授课老师深入浅出~让我们自己积极动手操作~结合实践来提高自己的操作能力~使每个学员得到了一次锻炼的机会。

2、学习了常用的办公软件~主要有OFFICE、WORD、EXCEL、POWERPOINT等~以及常用的几种软件的应用技巧~同时也学习了一些解决实际应用过程中经常出现的问题的方法~相信这次学习~会让我在今后的工作中运用电脑时能够得心应手。 3、在我们农村小学~大家对网络方面的知识较为贫乏~大多数人还从未接触过网络知识~还不能超前地认识到网络带来的好处。因此为了提高大家的认识~老师不仅采用实物演示的办法~而且还为我们提供实践操作的机会来为大家讲解有关组建局域网以及网络维护方面的知识~介绍了一些平时我们很少用到的网络检测命令~对我今后维护学校自己的局域网络有很大的帮助。在整个学习过程中我始终认真学习~把知识及时作以整理和复习~以便提高自身的知识水平和教学能力~以适应信息时代对我们教育工作者的要求。 计算机知识更新是很快的~随着教育体制的改革和教育理念的更新~以及信息技术的飞速发展~如何接受新的教育理念~转变我们传统的教育观念~来充实我们的专业技能~已经成为我们每一个教育工作者必须要解决的第一个问题。只有不断地学习~才能掌握最新的知识~把工作做得更好。我们也渴望能够参加更多的这类培训活动~以便更好地为各位老师提供学习的机会~使我县的教育教学水平能更上一个台阶~由此教育教学法质量的提高~促进学生的全面发展和成长。 学员:gong79626,威远县镇西镇中心校龚勇刚卡号:2300042707, 2008年4月17日 下面的是2016年经典励志语录,需要的朋友可以欣赏,不需要的朋友下载后可以编辑删除~~谢谢~~ 1、有来路,没退路;留退路,是绝路。 2、为目标,晚卧夜半,梦别星辰,脚踏实地,凌云舍我其谁! 3、做一题会一题,一题决定命运。 4、静下来,铸我实力;拼上去,亮我风采。

Adjoint Sensitivity Analysis in MSCNASTRAN

Adjoint Sensitivity Analysis in MSC/NASTRAN Erwin H. Johnson The MacNeal-Schwendler Corporation 815 Colorado Blvd. Los Angeles, California 90041 Abstract The Adjoint Method for sensitivity analysis can sometimes produce sensitivities at a fraction of the computer resources required by the Direct Method. This paper presents the motivation, theory, implementation and selected results from install-ing this technique in Version 70 of MSC/NASTRAN. The application of the method to large scale design tasks is seen to ‘‘enable” the practical solution to design tasks driven by NVH (noise, vibration and harshness) considerations. Concluding comments summarize the results and discuss possible further devel-opments. - 1 -

如何学好《计算机应用基础》课

如何学好《计算机应用基础》课 本文从网络收集而来,上传到平台为了帮到更多的人,如果您需要使用本文档,请点击下载按钮下载本文档(有偿下载),另外祝您生活愉快,工作顺利,万事如意! 随着科学技术的高速发展,人类已经进入信息化时代,计算机已经出现在各个角落,影响着我们的生活。《计算机应用基础》课作为一个基础学科,是学生学习计算机专业科目的基础。改变传统教学方法和提高学生学习这门基础课是必要的。 21世纪,随着计算机科学技术发展,它已经深入到社会的各个领域,在人们工作、学习和社会生活的各个方面正在发挥着越来越重要的作用。由于计算机的广泛普及,使计算机的一般的应用操作、文字处理和表格制作等已成为一种基本的操作技能。而这种操作技能在未来的知识经济社会中,是人们生存、求知、做事、沟通所必备的。加强计算机基础教育,在全社会普及计算机基础知识和基本技能,是一项十分紧迫而重要的任务。 现在,很多职业技术院校里都开设了《计算机应用基础》这门课程。是每个系别不同专业的学生必修

的一门文化基础课。该课程的教学质量直接影响学生的学习效果,也关系到学生在今后的学习工作中对计算机的应用。 从这几年的计算机教学状况和效果看,计算机教学存在着以下几个问题: 一、学生的基础水平参差不齐 我们现在教授的《计算机应用基础》主要是计算机基础知识、办公软件的应用、计算机网络知识等。在一些中等大城市的中学,甚至是小学就开设了计算机信息技术的课程,学习的内容与计算机应用基础课程相类似,同时日益增加的家庭计算机又为部分学生提供了良好的计算机学习环境,使大部分学生在入学前就已经具备一定的计算机基本知识和操作能力。而与这些学生相比较,一些来自农村的学生在计算机基本知识和操作能力上相差悬殊。入学前计算机水平较高的学生感觉到上课的内容太浅,没有新意,而入学前水平较低的学生又感觉到听不懂,课堂上学习的内容跟不上,课后难以消化,这样给教学带来了很大的困难。

MSCNASTRAN 颤振分析模块使用说明

1.MSC/NASTRAN 颤振分析模块使用说明 1.1.颤振分析模块 颤振分析模块考虑结构气动弹性问题的动力稳定性。它可以分析亚音速或超音速流,提供五种不同的气动力理论,包括用于亚音速的Doublet Lattice理论、Strip 理论以及用于超音速的Machbox理论、Piston理论、ZONA理论等。对于稳定性分析,系统提供三种不同的方法:二种美国方法(K法,KE法)和一种英国方法(PK 法),输出结果包括阻尼、频率和每个颤振模态的振型。本说明仅以亚音速Doublet Lattice理论为例。 1.2.建模的一般流程 其中结构有限元建模技术较为普及,不予说明。升力面建模和颤振分析文件以填卡较为实用,大致包括: 1)建立气动坐标系; 2)设定影响体; 3)选择颤振解法; 4)给出飞行环境; 5)给出马赫数和减缩频率系列; 6)设定求解参数,如参与耦合的频率范围或模态数; 7)选择适当的气动理论,定义升力面几何及分网信息。 至此完成升力面建模,下一步定义结构结点与升力面单元的耦合,即选择适当的样条将升力面结点同结构结点联系起来。其中升力面结点是在定义升力面后由系

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