FAQ 004675 | A cable structure model created in RFEM 5.13 cannot be calculated in the current version of the program. The program displays a message that "Stiffness matrix is singular," although it could be calculated in the original version. How can I fix this?

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First Steps with RFEM

First steps

We provide hints and tips to help you get started with the basic program RFEM.

08/27/2020

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Robert Martinec

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Question

A cable structure model created in RFEM 5.13 cannot be calculated in the current version of the program. The program displays a message that "Stiffness matrix is singular," although it could be calculated in the original version. How can I fix this?

Answer

The instability appearing in newer versions of the program is caused by a change in the setting of the initial stiffness that we had to do. This can be corrected in Calculation Parameters, under the Form-Finding tab. You use a lower FF calculation speed, which will not reduce the initial stiffness so radically, and the calculation will be more stable. In some cases, the number of FF iterations still needs to be increased.

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Dlubal FAQ Form-finding Stiffness matrix is singular Instability Frequently Asked Question FAQ about Dlubal Question and Answer about Dlubal

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  • Updated 09/29/2020

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