Correctly Interpreting Harmonic Results - Lesson 2

A time-history based analysis can be computationally expensive to study a structure under vibrating loads. Harmonic analysis is an alternative way to simulate the structure’s response to the forced vibrations. Unlike transient dynamic analysis, the harmonic analysis solves the structure’s dynamics in the frequency domain instead of the time domain. To understand an important behavior like resonance, where excessive motion, stress, noise, and vibrations occur at a certain frequency, harmonic analysis can be very useful. In this lesson, we will explore how to interpret harmonic results in a meaningful way using Ansys Mechanical.

Alternate video link.

Video Highlights

1:30 - Applications of Harmonic Analysis

2:19 - Assumptions of Harmonic Analysis

3:48 - Equation of Motion

5:04 - Restrictions of Harmonic Analysis

6:14 - Start of Walkthrough Workshop Simulation Example

9:06 - Inserting & Interpreting Frequency Response Plots

10:28 - Inserting & Interpreting Phase Response Plots

10:48 - Determining Peak Response of the Structure

12:18 - Computing Important Derived Quantities

Simulation Files

Download the accompanying geometry and archived files here. The student version of Ansys simulation software can be downloaded here.