Hi Venkata,
Yes, the methods you indicated are different ways of mode extraction. But please use the Program Controlled settings. If you are looking for comparison of mode-extraction methods then please refer to following links:
3.8. Comparing Mode-Extraction Methods (ansys.com)
How to access the ANSYS Online Help
For number of modes to be used, please refer to the following Ansys Innovation Course:
Mode Participation Factor and Effective Mass | Ansys Courses
Please see if this helps.
Regards,
Ashish Khemka
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