numerical singularity in modal analysis of ship
numerical singularity in modal analysis of ship
(OP)
Can you please let me know why i am getting numerical singularity in modal analysis of ship?
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numerical singularity in modal analysis of ship
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RE: numerical singularity in modal analysis of ship
RE: numerical singularity in modal analysis of ship
Actually i am solving this model in Abaqus. This model was unrestrained as i wanted to find its rigid body modes, but when i was solving this model for 0.0 to 5Hz, i was getting this error. Later i solved this model for 0.1 to 10 hz and its solved. So the question is why it happened and how to find rigid body modes now?
Thanks,
Amol
RE: numerical singularity in modal analysis of ship
RE: numerical singularity in modal analysis of ship
but why abaqus is not solving this model when i used 0.0 to 10 Hz?
RE: numerical singularity in modal analysis of ship
If you're looking for rigid body modes, 10 Hz is a lot. Expect real modes within 10 Hz. Can you try other programs?
also: try fixing it at both end and do a gravity load (static) calculation. Doesn't mean a thing but will tell whether the model is correct or not.
I know in one program i once used, i had to indicate i was looking for rigid body modes, or otherwise the program came back in error.
good luck
RE: numerical singularity in modal analysis of ship
but the model seems to be right as it is solved with inertia relief