Principal mode extraction
Challenge: Calculate and analyze a model with high density natural mode efficiently
In case of analysis for a large size FE model and/or in a higher frequency, it is often found that an analytical investigation of the phenomena by checking natural modes is difficult because the computation time becomes longer since there exists numbers of modes.
In addition, it is not easy to identify the principal mode which generates a peak of FRF primarily because mode contributing ratio is deconcentrated if the mode density is high enough.
How to resolve pains:
Applying PMA option of ESTECH.NAST+ puts similar natural modes together, which contribute to the response largely and eliminates unnecessary natural modes. The modes which are putting together mentioned above are named principal mode which makes complicated phenomena simpler
Strength of the Software
- Abridgement of modal model utilizing principal modes is available in order to speed up variation analysis.
- In case of complete reproduction of response functions, it is possible to reduce number of natural mode and simplify the phenomena by using modes which have higher contribution.
- The principal modes are different by excitation condition, response point and frequency range respectively. Therefore, it is available to investigate the mechanism of an individual phenomena by obtaining principal modes to individual phenomena which are paid attention to.
