Frequency Domain Analysis |
 
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Frequency Domain Analysis |
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Flexcom uses a standard technique from numerical analysis, which is termed relaxation, to improve the rate of convergence of frequency domain dynamic analyses. Using this technique, the solution of the equations of motion from a particular iteration is replaced by a weighted average of the solutions for that iteration and the previous one. Refer to Frequency Domain Convergence for further details.
Relaxation is a common numerical procedure and has the effect of improving the rate of convergence of iterative techniques, particularly in cases where results from successive iterations oscillate about the correct solution. As for the convergence parameter, the default value of 0.8 is adequate in the vast majority of cases. The value should be changed only when:
•A dynamic analysis repeatedly fails to converge, even though the tolerance measure and/or the maximum number of iterations have been altered (within reason).
•You are certain the finite element model is indeed physically reasonable and capable of withstanding the specified environmental conditions.
•*TOLERANCE is used to define the analysis convergence tolerance measure and related data.