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OptiStruct模态分析报错，什么原因啊？ 50
*** ERROR # 160 ***
Gram-Schmidt reorthogonalization did not converge. This is caused by
ill-conditioning of the shifted matrix in Lanczos run.
(e.g. zero lower bound specified for a model with rigid body modes.)
Solver error no. = 728
subcase id = 1
This error was detected in subroutine splncz4.
This error occurs in module "eigdrv".
************************************************************************
RESOURCE USAGE INFORMATION
--------------------------
MAXIMUM MEMORY USED 13772 MB
MAXIMUM DISK SPACE USED 18830 MB
************************************************************************
************************************************************************
COMPUTE TIME INFORMATION
------------------------
EXECUTION STARTED Tue Sep 11 20:02:34 2018
EXECUTION COMPLETED Tue Sep 11 20:34:30 2018
ELAPSED TIME 00:31:56
CPU TIME 00:12:04
************************************************************************
*** PROGRAM STOPPED: FATAL ERROR(s) ENCOUNTERED.
***** END OF REPORT *****
For Useful OptiStruct Tips and Tricks, go to the URL:
http://www.altairhyperworks.com/tips.aspx
************************************************************************
OptiStruct error termination report printed to file
"biw_modes.stat".
PROGRAM STOPPED DUE TO ERROR.
************************************************************************
A fatal error has occurred during computations:
*** ERROR # 160 ***
Gram-Schmidt reorthogonalization did not converge. This is caused by
ill-conditioning of the shifted matrix in Lanczos run.
(e.g. zero lower bound specified for a model with rigid body modes.)
Solver error no. = 728
subcase id = 1
This error was detected in subroutine splncz4.
************************************************************************
