Modal Truncation in Ansys Mechanical — How many modes to include? — Lesson 3

In Linear Dynamics, the mode-superposition method provides a very efficient method of determining the response of a system. Since this method uses a linear combination of modes for calculating the response of a structure over a range of frequencies, an adequate number of modes needs to be carefully extracted. This video lesson will discuss the significance of modal truncation and also discuss some guidelines and tools on how to extract enough modes. We have a short lecture followed by a workshop example to demonstrate the importance of modal truncation.

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0:00 - Intro
01:12 - Generalized Coordinates or Modal Methods
02:05 - Extracting Optimal Number of Modes
03:22 - Guideline 1: Appropriate Frequency Range
04:10 - Guideline 2: Ratio of Effective Mass to Total Mass
05:20 - Guideline 3: Understanding Actual Modes
07:20 - Improving Accuracy with Fewer Modes
08:18 - Walkthrough Example – Clamp