Appendix J: Adams Solver Error Codes Related to Nonlinear Flexible Bodies

Message:

"Adams Units are not explicitly defined. No unit conversion will be performed for NLFE Flexbody #"

Action:

INFO - continue simulation

Supplementary Info:

Adams units are not specified. No unit conversion between Adams model and Nastran Model will be done

Message:

"NLFE Units are not explicitly specified in the NLFE Input file for NLFE Flexbody #. NLFE Units must be explicitly defined in the NLFE input file using the DTI,UNITS Bulk Data Entry. The NLFE Service will be terminated..."

Action:

ERROR - stop simulation

Supplementary Info:

Nastran units are not specified in the Nastran input file. Return to Adams with appropriate error message

Message:

"NLFE Units specified in the NLFE Input file for NLFE Flexbody # do not match Adams units. Set uniform units for all Adams and NLFE flexbodys and restart the job. The NLFE Service will be terminated..."

Action:

ERROR - stop simulation

Supplementary Info:

Adams units and Nastran units do not coincide. Return to Adams with appropriate error message.

Message:

"Adams Ground Coordinate System (AGCS) and NLFE Basic Coordinate System (NBCS) are not coincident for NLFE Flexbody #. Make sure both coordinate systems have the same origin and orientation and re-run the job. The NLFE Service will be terminated..."

Action:

ERROR - stop simulation

Supplementary Info:

Adams GCS and Nastran BCS are not coincident

Message:

"Unable to get basic coordinates of Marker Grid points for NLFE Flexbody #. The NLFE Service will be terminated ..."

Action:

ERROR - stop simulation

Supplementary Info:

Error when attempting to get xyz coordinates and grid ids

Message:

"Grid point with ID # is not defined in the NLFE Input file for NLFE Flexbody #. The NLFE Service will be terminated ..."

Action:

ERROR - stop simulation

Supplementary Info:

Marker grid point 'i' do not exist in nastran bulk data file. Return to Adams

Message:

"Error due to modeling – check the bdf/dat file of Nastran External System #.The following grid points are non-compliant with NLFE simulation: the node with ID xxxxx is dependent GRID of rigid elements except RBE3"

Action:

ERROR - stop simulation

Supplementary Info:

A node referenced by a marker on the flex body is defined to be a dependent grid on an RBE2 rigid element in the Nastran model. This is only allowed for RBE3 type rigid elements. Nastran SOL 103 may be lenient and allow this type of rigid element definition. However, SOL 400 for NLFE bodies is sensitive to this modeling aberration. The model in the BDF will need to be modified such that grids referenced as marker nodes are defined as independent grids in RBE2 elements. Or the RBE2 element needs to be converted into an RBE3.

Message:

Review the modeling files (bdf/dat/adm/acf) to check the above ..."

Action:

INFO - continue simulation

Supplementary Info:

If a non-linear iteration is diverging during the simulation, a warning is reported without stopping the simulation. Simulation may progress if the integrator is able to recover. In case simulation is not able to converge, this warning is reported at the end to allow the user to properly correct the model

Message:

"Error in reporting contact status errorId from sol400 for NLFE Flexbody #. The NLFE Service will be terminated ..."

Action:

ERROR - stop simulation

Supplementary Info:

Error in returning contact status from sol400

Message:

"Contacts have been defined by user through BCONTACT parameter in bdf/dat file for NLFE Flexbody #, but contact status has not been requested. If contact status output is required, please add BOUTPUT to Error ID = control of run-ready BDF."

Action:

INFO - continue simulation

Supplementary Info:

User defined the parameter BCONTACT into the dat but did not require the BOUTPUT

Message:

"Contacts are defined for NLFE body but no nodes are currently touching for NLFE Flexbody #"

Action:

INFO - continue simulation

Supplementary Info:

Contact info requested, bodies have not entered in contact yet during the whole simulation

Message:

"Self contact became active at simulation T=# for NLFE Flexbody #"

Action:

INFO - continue simulation

Supplementary Info:

Contact info requested, bodies previously in contact are going out of contact

Message:

"Self contact became inactive at simulation T=# for NLFE Flexbody #"

Action:

INFO - continue simulation

Supplementary Info:

Contact info requested, bodies are becoming in contact again

Message:

"Error when set up csDBlk1 -- # Mrk exceeds limit for NLFE Flexbody #. The NLFE Service will be terminated ..."

Action:

ERROR - stop simulation

Supplementary Info:

Error when exiting NLFE service

Message:

"Error when set up csDBlk1 in sending marker data, fail to set up column 1 for NLFE Flexbody #. The NLFE Service will be terminated ..."

Action:

ERROR - stop simulation

Supplementary Info:

Error when exiting NLFE service

Message:

"Error when set up csDBlk1 in sending marker data, fail to pack matrix for NLFE Flexbody #. The NLFE Service will be terminated ..."

Action:

ERROR - stop simulation

Supplementary Info:

Error when exiting NLFE service

Message:

"Unable to write DDU/V/A U_j/V-J/A_j datablocks to NLFE DB for NLFE Flexbody #. The NLFE Service will be terminated ..."

Action:

ERROR - stop simulation

Supplementary Info:

Error when attempting to write DDUFE matrix to Nastran database

Message:

"Unable to read and/or unpack the System matrices csK, csM, csB for NLFE Flexbody #. The NLFE Service will be terminated ..."

Action:

ERROR - stop simulation

Supplementary Info:

Error when attempting to unpack system matrices

Message:

"Incompatible size of system matrices for NLFE Flexbody #. The NLFE Service will be terminated ..."

Action:

ERROR - stop simulation

Supplementary Info:

Error with system matrices sizes

Message:

"Unable to read and/or unpack the residual csR for NLFE Flexbody #. The NLFE Service will be terminated ..."

Action:

ERROR - stop simulation

Supplementary Info:

Error when attempting to unpack residual vector

Message:

"Error with size of csR for NLFE Flexbody #. The NLFE Service will be terminated ..."

Action:

ERROR - stop simulation

Supplementary Info:

Error with residual vector size

Message:

"Unable to get data from csR for NLFE Flexbody #. The NLFE Service will be terminated ..."

Action:

ERROR - stop simulation

Supplementary Info:

Error when attempting to recover data from unpacked matrix

Message:

"Unable to read rebased States datablock csUVALim for NLFE Flexbody #. The NLFE Service will be terminated ..."

Action:

ERROR - stop simulation

Supplementary Info:

Error when attempting to read rebased states

Message:

"Unable to retrieve rebased States from PackedMatrix for NLFE Flexbody #. The NLFE Service will be terminated ..."

Action:

ERROR - stop simulation

Supplementary Info:

Error when attempting to retrieve data matrix

Message:

"Logical The residual array does not have one column or does not exist for NLFE Flexbody #. The NLFE Service will be terminated ..."

Action:

ERROR - stop simulation

Supplementary Info:

Residual does not have 1 column

Message:

"Unable to get data from MNFDB for NLFE Flexbody #. The NLFE Service will be terminated ..."

Action:

ERROR - stop simulation

Supplementary Info:

MNFDB block cannot be read properly

Message:

"Unable to get grid coordinates XYZ and external grids Id from BGPDT table for NLFE Flexbody #. The NLFE Service will be terminated ..."

Action:

ERROR - stop simulation

Supplementary Info:

Error when attempting to get grid coordinates and external grid ids from BGPDT table

Message:

"Unable to get element connectivities and dimensions from ECT table for NLFE Flexbody #. The NLFE Service will be terminated ..."

Action:

ERROR - stop simulation

Supplementary Info:

Error when attempting to get element connectivities and dimensions from ECT table

Message:

"Unable to allocate memory -- bad allocation in var_name for NLFE Flexbody #. The NLFE Service will be terminated ..."

Action:

ERROR - stop simulation

Supplementary Info:

The system is unable to allocate dynamic memory for the var_name data structure, hence the simulation will be terminated (std::bad_alloc)

Action:

ERROR - stop simulation

Supplementary Info:

This error caused due to a failure to generate residual for the MaxFlex body. For more information refer to the flexible body's F06 file.

Message:

"Nonlin fails to reach HALT 4 for NLFE Flexbody"

Action:

ERROR - stop simulation

Supplementary Info:

Error in executing the Nonlin DMAP and correctly getting the residual of nonlinear flexbody by executing the NLSOLV Module. For more information refer to the flexible body's F06 file.

If the BDF for the flex body contains the following fatal message:

This usually results from a modeling error in the flex body BDF. For example, check the RBE2 definitions for any modeling issues. All independent degrees of freedom of RBE2 must have non-zero stiffness value or else the model may have difficulty solving in Adams. For example, if dependent GRIDs of RBE2 are only connected to solid elements, they won't have rotational stiffness, so the independent degrees of freedom of the RBE2 should be specified in the BDF as 123 instead of 123456. In addition, the number of dependent GRIDs of RBE2 should be more than 2 in this case to avoid the singularity of the independent degrees of freedom computation.

Message:

"Initialize for FLEX_BODY/1: Unable to resume execution of nonlin sequence to loop back to before NLSOLV for NLFE Flexbody

The NLFE Service will be terminated ..."

Action:

ERROR - stop simulation

Supplementary Info:

This error is caused due to a failure to generate the Jacobian for the MaxFlex body. This occurs during initialization of the flexible body and could point to something missing or wrong in the flexible body definition. For example, no mass is defined for the flexible body. For more information refer to the flexible body's F06 file.

Message:

"Unknown error -- check the f06/cslog files for NLFE Flexbody #. The NLFE Service will be terminated ..."

Action:

ERROR - stop simulation

Supplementary Info:

If the Adams NLFE Service returns an error with no error code, we terminate the simulation. The user is advised to look into the flexible body log file (f06) for supplementary FATAL information. This situation can exist only if none of the above error code caught the exception.

Message:

"NLFE error ID=..." or "NLFE info ID=..."

Action:

ERROR - stop simulation

Supplementary Info:

The analysis with MaxFlex cannot converge due to problem in Adams or Nastran solution. Check the Nastran F06 file for FATAL or WARNing messages for more information on if there's a problem in solving the NLFE flex body.

An example of a FATAL message in f06 file could be:

In this case NLFE solution is having problems converging because of excessive nonlinear deformation. This may be due to poor material property definition, excessive boundary conditions or a severely distorted mesh that would normally require a re-mesh which is not supported.