In the previous article, we introduced that increasing the number of constraint points in the model is an effective way to increase the eigenvalues.
There are other ways to increase eigenvalues.
①Material change.
If the stiffness (Young's modulus) of the material used is low, the eigenvalues can be increased by changing to a higher material. However, in general, materials with a high Young's modulus often contain talc or glass fibres, and the material density tends to increase. Therefore, it may not be possible to increase the eigenvalue as much as desired.
If the material used is changed to PP ➡ PP-GF20
Young's modulus increases by a factor of four, but the material density also increases, so the eigenvalues increase by a factor of less than two.
② Change of product shape
The eigenvalue can be increased by increasing the rigidity of the product by increasing the wall thickness or adding a rib shape. However, since the product weight also increases, the eigenvalue may not increase as much as expected.
Increasing wall thickness
Additional ribs.
The above two examples are successful in increasing the eigenvalues due to the product geometry and constraint points.
However, there are cases where this is not always possible.
In such cases, we need to closely communicate with the design team and the CAE team to create the geometry.
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