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Hi Novly Abdurohman
I am not too familiar with Bar horn design specific, but the link you provided is form Krell Engineering who is one our Autodesk Simulation Mechanical users. Looking at the following website,
http://www.krell-engineering.com/fea/fea_info/fea_resonator_design.htm#Modeling Considerations
it seems to me that the analyst is using a natural frequency analysis and then performing a frequency response to calculate the deformations and stresses.
Best Regards
Sualp Ozel.
Krell Engineering is my company. Please send me an email (dculp@krell-engineering.com) so that we can discuss your questions in detail. There is no charge.
Don Culp