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5. Error: Index was outside the bounds of the array at Dew.Math.TMtxVec.get_DefaultArray(…)

Error: Index was outside the bounds of the array at Dew.Math.TMtxVec.get_DefaultArray(…)

Contents

When you run a model analysis, you get the error:

Solution

The number of eigenfrequencies that can be calculated for a structure depends on the degrees of freedom.
For example: a column has a fixed support at the bottom and has 8 divisions in the mesh.

• Without additional boundary conditions, each meshnode has 6 degrees of freedom. Thus you’ll be able to calculate 8 x 6 = 48 eigenfrequencies. From the moment you ask 49 eigenfrequencies, you’ll get the error above.
• If you prevent for example the displacement in the Z-direction and the rotation around the X-axis along the column, each mesh node has 4 degrees of freedom. You’ll be able to calculate 8 x 4 = 32 eigenfrequencies.

So if you get the error above, you

• either asked too many eigenfrequencies
• either don’t have enough degrees of freedom. Choose a smaller mesh size.