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ERROR LIST LATEST UPDA

TE: 20-FEB-2001

CURRENT ERROR LIST

--------------------------------------

This section includes a description of all known errors and general

limitations in all versions of n.

The field next to the error

number indicates the version that the error is corrected.

field stands for

a General Limitation which indicates

a fix is not planned.

Continuous updates to the error list are available to

n clients on the MSC web page at .

The site may be located by clicking on

Major Capabilities

A list of major capabilities is provided to assist the analyst is

choosing key-words to search for to locate error that may impact

their current project.

Error Description

Each error has a heading with as many as

three

entries.

The

first

entry

identifies

the major capability affected and is also listed in

the major capabilities index.

The second

entry

identifies

either

the

name

of

the module in which an abnormal exit occurs or the card type

affected if computed results

are

not

satisfactory.

(For

abnormal

exits,

the

last

module name that appears in the Performance Summary

Table is usually the module where the exit occurs.)

The

third

entry

gives

the

symptoms

of the error, such as, the MSC/NASTRAN system or

user message number printed just prior to termination or a description

of

a

error

Other

symptoms

might be missing

output or wrong answers.

Error reports are updated when more facts or

better avoidance techniques become known.

NOTE:

Beginning with Version 68, MSC/NASTRAN has adopted a Version numbering

system of the form

.ZZ, where XX is the major release, YY

indicates a minor release with few enhancements and ZZ indicates error

corrections.

Note that modifications to the code that are required

so that a specific machine runs the same as previous releases on other

machines are considered error corrections in this numbering scheme.

Thus, there may not be any references in the error list to a specific

release number.

Keyword Index

The Keyword Index has been removed from the error list

Since the error list is maintained internally at MSC in

a

relational

database

and

is

provided

to

the

user

in

various

electronic

formats search utilities have replaced the need for a

keyword

index and the

maintenance

of

the

keyword

index

has

been

discontinued.

A list of the major categories follows:

Accounting

Acoustic Analysis

Aeroelastic Analysis

Authorization

Axisymmetric Fluid Elements

Beam Library

Buckling Analysis

Buckling & Differential Stiffness

Case Control

Complex Eigenvalues,

Component Mode Synthesis

Composites

Cyclic Symmetry

DBC/TRANS/ACCESS

DMAP

Database

Design Sensitivity

Documentation

Dynamic Reduction

Dynamic Response Analysis

Eigenvalue Analysis

Element Strain Energy

Elements

Estimate

Executive

Executive Limits

External Superelements

File Management Section

Frequency Response

Frequency Response and Random Analysis

Gap Constraints

Geometric Nonlinearity

Grid Point Force

Grid Point Stress

Grid Point Stress Discontinuities

Heat Transfer Analysis

Hydroelastic Analysis

Hyperelastic Nonlinear Analysis

Inertia Relief

Installation

Interface Elements

Iterative Solver

Limitation on Problem Size

Loads

MSC/ACCESS

MSGMESH, MSGSTRESS, MSGVIEW

Material Nonlinear Analysis

Materials

Matrix Methods

Method Selection

Miscellaneous

Modal Augmentation

Nonlinear Analysis

Nonlinear Eigenvalue Analysis

Nonlinear Slide-Line Analysis

Nonlinear Static Analysis

Nonlinear Superelement Analysis

Nonlinear Transient Analysis

Nonlinear Transient Heat Transfer

Old Design Sensitivity

Online Documentation

Optimization/Design Sensitivity

P-Elements

Parallel

Performance

Plotting

Postprocessing

Response Spectra

Restarts

Rigid Elements

SSSALTERS

Security

Sequencer

Single Point Constraints

Static Aeroelastic Analysis

Static Analysis

Submittal

Superelements

Thermal Stress Analysis

Timing Estimate

Transient Nonlinear Analysis

Transient Response Analysis

Utilities

Virtual Mass

@

399;

70.5;

Eigenvalue Analysis - CEAD, QRG - Unexpected Normalization

Complex eigenvalue analysis with the inverse power method of eigenvalue

extraction will always normalize to MAX.

POINT normalization requests are

ignored.

The Version 70.5 Quick Reference Guide has been updated to

indicate that point normalization is only available for the det method.

@

745;

GL;

Plotting - XYOUTPUT - UFM 688, UFM 687

In requesting XYOUTPUT, if the last frame request on an XYPLOT

command is for an upper frame only, e.g.,

...(T1,), then the USER FATAL MESSAGE 688 or 687 will terminate the run.

An avoidance is to explicitly insert 1000 for the component of the

lower frame plot, e.g., ..(T1,1000).

@

785;

69;

MSGMESH,

MSGSTRESS,

MSGVIEW

-

MSGMESH,

DIAG

29

-

Infinite

CPU Loop

If MSGMESH is used with the link specification update feature, an infinite

loop occurs.

An infinite loop no longer occurs; UFM 53 will be issued

indicating an incorrect format for the mesh entries.

@

796;

GL;

Hydroelastic Analysis - AXIF - UFM 2047, UFM 2053

If the harmonics flag is set to

then the Case Control command AXIS=FLUID may not be used.

@

827;

GL;

Response Spectra - DLOAD, RLOADi, TLOAD - UFM 2135

Scaled Response Spectra uses DLOAD Bulk Data entries.

They point to DTI

entries, and can violate the DLOAD rule that says the Li entries must be

unique. However, the DLOAD entry is not checked if no RLOADi or TLOADi

entries appear in the Bulk Data Section.

It is therefore illegal to have

RLOADi or TLOADi entries present when using scaled response spectra.

If

they are not present, the solution sequence will function properly.

@

868;

70.7;

Miscellaneous - PUNCH - Incorrect Format

STRESS(PUNCH) will not properly output the HEXA, PENTA, BEND, BEAM,

TRIA6, or QUAD8 elements.

Element margins of safety (ROD, CONROD, TUBE,

and BAR elements) will produce poor punched formats if stress allowables

are not given on the referenced MATi entries.

@

888;

GL;

Limitation on Problem Size - Rigid Elements - UFM 3008

The capacity for processing Rigid Elements in the GP4 module is

limited since the entire nonzero RG matrix must be stored in memory.

Splines are particularly bad.

For example, let NS = the number of

RSPLINEs (two dependent, five independent), R = the number of RBARs, and

NG = the number of grids.

Then, (350 X NS + 90 X R) < (OC -7 X NG - 3 X

BUFFSIZE).

For example, if OC = 72000, NG = 1000 and BUFFSIZE = 4166,

then the user is limited to 150 splines.

@

889;

GL;

Elements - CELAS - Unintended Constraints

Scalar elements connected to noncolinear degrees of freedom introduce

constraints which will not appear in the output.

@

890;

GL;

Grid Point Force - GPFDR - UFM 3008

The open core requirement for the GPFDR module can be as large as (6

X BUFFSIZE + 14 X number of grids) if the grids use a nonrectangular

displacement coordinate system.

For problems in basic coordinates, the

grid requirement drops to 8 X number of grids.

@

903;

GL;

Elements - CONEAX, SORT2 - Incorrectly Formatted Output

Conical shell problems do not prepare SORT2 output properly.

In

addition, the SORT2 requests generate

unwanted and meaningless punched output.

@

916;

GL;

Plotting - XYPAPERPLOT - Missing Plot Output

X-Y paper plots do not include all the features of a graphic plotter.

Titles and MAX/MIN functions are about the only features supported.

TICS, DIVISIONS, GRID LINES, and LOG SCALES are not supported.

@

1022;

GL;

Nonlinear Analysis - OLOAD - Wrong Answers

The resultants for the applied loads are incorrect if cylindrical or

spherical coordinates are used.

This

output is informational only and the solution is not affected.

@

1065;

GL;

Superelements - SEMA - SEMA FATAL MESSAGE

Superelements may be excluded from assembly in SEKR and SELR

(SEEXCLUDE).

However, if all upstream

superelements are excluded from a given superelement, then the program

will fail.

An avoidance is to put PARAM,NOUP,-1 in the first Case Control

subcase for the failing superelement.

@

1086;

GL;

Plotting - CONTOUR - UFM 4212

Insufficient open core for contour plotting may result in a

misleading message.

The avoidance is to increase open core.

@

1103;

GL;

Dynamic Response - TRD, TRD1, FRRD, FRR - UFM 3005

If the MGIV method of real eigenvalue extraction computes modes for

massless DOF with uncoupled stiffness

terms, the eigenvalue is large (1.E+35) as it should be, but the

generalized stiffness is 0.0 (it should also be

1.E+35).

Null eigenvectors may be produced.

An avoidance is to use PARAM,HFREQ or PARAM,LMODES to discard these

bad modes in dynamics.

@

1125;

GL;

Sequencer - RESTART, PARAM,NEWSE - Wrong Answers

If the sequence processor is used for any part of an analysis, it

should be executed on all restarts which

input data.

The value of PARAM,NEWSEQ should remain unchanged in every

run.

@

1183;

GL;

Eigenvalue Analysis - READ - Negative Term on Factor Diagonal

If the user requests the eigenvector for an infinite frequency mode,

the program may fail.

An avoidance is to reduce the ND value on the EIGR bulk data entry to

be less than N.

The Nth eigenvector is numerical noise.

@

1308;

68;

Aeroelastic Analysis - FA1 - Poor Answers

The eigenvalue extractions by the PK and KE methods are performed in

lower precision than most other

calculations (

Excessive truncation error may occur

in some problems on short-word machines.

The only machines that will not experience this problem are the CRAY

, CDC

and NEC computers.

Contact MSC for

avoidance procedure.

@

1357;

70.5;

Aeroelastic Analysis - GI - Poor Accuracy

The linear splines used to connect structural and aerodynamic degrees of

freedom are sensitive to modeling techniques, particularly on short-word

machines.

This included all machines except CRAY, CDC and NEC.

It is

good practice to have the spline axis coincide with the structural grid

points, and to avoid discontinuities in the lines joining structural grid

points by using separate splines on each side of the discontinuity.

@

1405;

GL;

Elements - HEXA - Stress Discontinuities

Transitioning mesh densities by connecting two elements to one with

midside nodes causes local stress perturbations, because the assumed

displacement shapes at the interface are not compatible.

An avoidance is to use PENTA elements to change the mesh size.

@

1551;

GL;

Eigenvalue Analysis - READ - Eigenvalues Not Found

The wrong reason for termination may be given if the region for

search listed on the EIGB or EIGR bulk data entry does not include

negative eigenvalues or if NE is underestimated.

An avoidance is to increase the number of roots desired (ND) and the

number estimated (NE) to ensure all roots in the region are found.

@

1575;

69;

Dynamic Response - VDR - No Output

If an OUTPUT(XYPLOT) command is in case control, but there are no

other XYPLOT commands, all printed output requests are ignored.

An avoidance is to put in XYPLOT requests or remove the

OUTPUT(XYPLOT) command.

@

1581;

GL;

Elements - SOL 64, 66 - Various Symptoms of Numerical Instability

If flat plate models have out-of-plane singularities when unloaded,

but have enough angle between adjacent

plates to constrain singularities in the deformed state, various numerical

problems such as overflow,

machine-dependent messages from trigonometric functions, or other problems

may arise.

An avoidance is to use PARAM,K6ROT,1.0 to provide stiffness for the

out-of-plane singularities.

@

1584;

GL;

Geometric Nonlinearity - GNFM - SFM 3007

If PARAM,TESTNEG

,-2 is used in SOL 64, and grid point singularities

exist, the computational zeroes they cause on the diagonal of the factor

of the stiffness matrix can be small negative numbers, leading to the

error message

PARAM,TESTNEG

,-2 should not be used in Subcase 1.

PARAM,AUTOSPC,YES

will remove this type of singularity.

@

1664;

GL;

DMAP - Dummy Elements - Wrong Answers

User-written element subroutines that use OXFORM=5 produce incorrect

results from the EMA module.

The values of OXFORM=3 or 4 may be used

instead.

@

1679;

66;

Elements - QUAD4,TRIA3 - Wrong Answers

When the MID4 option of the PSHELL card is used to simulate offset of

the element centerline from the grid

point plane, the element is somewhat too stiff.

The error increases with

the ratio of offset to element width.

An avoidance is to use RBAR elements to model the offsets .

@

1712;

GL;

Frequency Response Analysis - RANDOM - SWM 3002, UWM 979

If a non-existent point is referenced in an output request when there are

multiple subcases, the RANDOM module will cease processing at that point

and issue SYSTEM WARNING MESSAGE 3002. The following user warning message

is now issued:

0*** USER W

ARNING MESSAGE 979, AN XY-OUTPUT REQUEST FOR POINT OR

ELEMENT

ID

2000

-ACCE- CURVE IS BEING PASSED OVER.

THE ID COULD NOT BE FOUND

IN DATA

BLOCK

102

@

1738;

66;

Grid Point Stress - Preface - UFM 603

If the SURFACE Case Control card has a continuation card, and the

first words that appear on this card are

OUTPUT SYSTEM, the error occurs.

An avoidance is to start the continuation with another word.

@

1739;

66;

DMAP - DIAG 4 - Addressing ERROR

If DIAG 4 is used on restart, the program may exit abnormally at the

start of the run.

The DIAG 4 cross reference output for Label Names will be incorrect

if no labels exist in the DMAP, and the

parameter section of the cross reference will not contain any parameters

although parameters are present.

An avoidance is to put a label in the DMAP.

@

1758;

GL;

Cyclic Symmetry - Restarts - Various

In superelement static cyclic symmetry (SOL 81), some restart paths

do not function well.

The following

restart paths have been demonstrated to work, using the indicated input

and DMAP Alters.

Other types of

restarts can be made, using these techniques.

A. Conventional Superelement Restarts.

Use the same techniques applicable to noncyclic symmetry superelement

analysis.

1.

Exit during Phase I.

2.

Structural Changes in a Superelement.

3.

Load Change Restart

B. Time Limit in a Harmonic Loop

SET N = 0, residual only

SEMG = N

PARAM,RESDUAL,-1 (bulk data)

Input all bulk data,

or use PARAM,NODA

TA,-1 and delete all the bulk

data except PARAM entries.

C. Loads Change in One Tip Superelement, Same Number of Loading

Conditions,

Same Load

SET N = include changed superelement plus all downstream S.E.'s

including the residual structure.

SELR = N

SELG = N

PARAM,DLOAD,-1

Input all loads.

(Conventional Superelement Restart.)

D. Additional Output (Not required in MSC/62)

Harmonics, NOUTPUT or HOUTPUT cannot be changed.

Subcases and Load IDs cannot be changed.

SEDR = ALL

Case Control

ALTER

595 $$ MSC/61B

SETV

AL

////////////APP/C,N,CYC $$

Exec. Control

Input all bulk data,

or use PARAM,NODA

TA,-1 and delete all the bulk

data except PARAM cards.

E. Selective Data Recovery (CYCLIC1 - UFM 4587)

In SOL 81, if the SEDR command selects a set other than all, the error

occurs in PHASE III.

An avoidance is to have subcases defined for all superelements.

Control

output by placing output

requests in other subcases with no output requests. The SEDR Case Control

card should not be used in

cyclic symmetry.

@

1759;

69;

Plotting - RF24D20, Superelement - Wrong Labels

If SPC labels at grid points are requested for plotting (

resequencing is requested, the SPC labels are attached to the wrong

components.

An avoidance is to make a separate run for these plots without

resequencing, and insert an EXIT after the RFAlter, or not request the

SEKR operation in superelements.

@

1765;

70.5;

Cyclic Symmetry - CYCLIC2 - UFM 3005, UFM 4319, UWM 4359