Hello Fukun, See following WIKI locations for information on modal analysis and Frequency sub-report: 1. Dynamic "Modal" Analysis 2. "Frequencies" sub-report select: Item #1: What options are available to increase the participation factors in a model with multiple disconnected systems? Item #7: What are the Participation Factors and the Captured Modal Mass in AutoPIPE's frequency report? This should answer your questions in detail. Regards, Mike Dattilio Bentley Product Advantage Group Analyst AutoPIPE Product Line Bentley Systems, Inc. ===================================================
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