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The natural frequencies computed by LARSA are in good agreement with the values obtained by ANSYS and EASE2 programs. LARSA and COSMOS results are identical. In ANSYS and EASE2 solutions, 24 eigenvalues are computed using the Guyan reduction method retaining only 24 mass degrees of freedom, whereas in LARSA and COSMOS, the eigenvalue problem has been solved using all degrees of freedom.
Tested Features
Reference
- Program Verification and Qualification Library, ASME Pressure Vessel and Piping Division, Committee on Computer Technology, 1972.
Sources
- ANSYS, Engineering Analysis System, Examples Manual, Swanson Analysis Systems, Inc., Elizabeth, PA, 1977.
- EASE2, Elastic Analysis for Structural Engineering, Example Problem Manual, Engineering Analysis Corporation,
- COSMOS, Finite Element Analysis Program
- LARSA 4D