In RF-/DYNAM Pro, I get the error message No. 10040: "It was not possible to calculate the eigenvalues for the entered precision [...]". How can I fix this error?

Answer

In a dynamic analysis, you can only calculate the eigen modes as many degrees of freedom as the system has. With degrees of freedom, the number of mass points multiplied by the number of directions into which the masses act is meant.

Example

A cantilever that is not split by the FE mesh has a mass point at the end. The action direction of the masses in RF-/DYNAM Pro is limited to the X and Y direction. Thus, the system has 2 degrees of freedom, so only 2 eigen-modes can be calculated.

Caution: In this case, the choice of the solution method is very important. In contrast to the "Root of Characteristic Polynomial" method, the Lanczos method can not calculate all eigenvalues of the system, but only n -1, which means in this example only 1 eigenvalue.

Keywords

Error 10040 Error message 10040 Warning Eigenvalue Degree of freedom Eigenmode

Reference

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