"THREE FACTORIZATIONS IN A ROW FAILED. CHECK THE MODEL. IT IS POSSIBLE THAT THE MODEL CONTAINS THE KINEMATIC COUPLING DEFINITION SET UP IN A WAY THAT A DEGREE OF FREEDOM HAS NEITHER MASS NOR STIFFNESS"
In the linear perturbation, frequency. Instead of lanczos, choose subspace it works
It seems from the message that you are trying to perform a dynamic analysis however, the software is facing a problem in one of the rows of the mass matrix and one of the rows of the stiffness matrix being of null values so try to do the following:
Hello Prof. Darwish,
Thank you so much for your detailed response. Actually I am doing modal analysis of a space frame chassis, to obtain the five eigen values. I have meshed the model using T3D2 element (A 2-node linear 3-D truss). On submitting the job I got above error. Could you please suggest the solution for this case.
Regards,
I suggest to do the thing one step at a time:
I have a previous experience with a case similar to that and the solution mentioned in item 5 stopped the error.
Good luck
Thank you Prof. Darwish for your prompt response. I am working on the 5th point mentioned by you. Hopefully it should my work in my case.
Best Regards,
Hello Pankaj.
I think that the problem comes from forgetting of( mass or density) and ( Stiffness or material propriety), these définitions are needed to make modal analysis or dynamical amalysis, to calculate stiffness and mass distribution.
The procedure proposed by Professor Darwish is an efficient way to identify the cause of the error.
In dynamical or insteady simulation models mass and matrial proprieties are needed to make realist behavour.
Good luck.
I got same problem now, and I am already identified the properties and the materials of the model correctly, but still the problem is a same.
:(
Any suggestions please
Hello! I am new to Abaqus. I got the same problem, after the analysis I get the error
THREE FACTORIZATIONS IN A ROW FAILED. CHECK THE MODEL. IT IS POSSIBLE THAT THE MODEL CONTAINS THE KINEMATIC COUPLING DEFINITION SET UP IN A WAY THAT A DEGREE OF FREEDOM HAS NEITHER MASS NOR STIFFNESS.
Can somebody help. I can provide the file if needed.
Thanks
You may use Subspace as a Eigen solver for modal analysis , It worked for me.
In the linear perturbation, frequency. Instead of lanczos, choose subspace it works
Dear Pankaj Dhaka,
Do you mind telling us some details about your model. If your are using beam elements connected somehow (springs, constrains) with other parts, try applying boundary conditions at the rotations of the beam. In general check the basic kinematics of your model and try constrain the less significant. It worked for me.
Cheers
Please guide me.
I used Subspace instead of lanczos to correct this error:
"Three factorization in a row failed. It is possible that the model contains the kinematic coupling definition set up in a way that a degree of freedom has neiter mass nor stiffness."
I chose number of eigenvalues to display 15, but the frequency is available for 6 modes, the value of which is 0 and close to zero.
Do you have a suggestion to solve this problem?
Arefeh Dankoob
This happens when you have free parts with no boundary conditions applied
- Badges
- Science topic