Predicting Transient Vibrations in Ansys Mechanical — Lesson 2

Transient vibrations usually occur when a system is excited by a sudden, non-periodic excitation. The magnitude of such oscillations varies based on the type of excitation, and they occur at the system's natural frequencies. Examples include the impact of a baseball bat or cricket bat on a ball, non-destructive testing procedures, vibration monitoring techniques, and even the response of a building during an earthquake. The mode-superposition method is a good way to forecast how a structure will respond to various kinds of loads, hence providing answers to queries related to the response's peak amplitude, timing, and time to decay. In this video lesson, we start with a short lecture and then get into a workshop example in Ansys Mechanical.

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Video Highlights

01:15 Transient excitation
01:44 Benefits of mode superposition (MSUP) method
02:12 Limitations of (MSUP) method
02:48 Definition of impulse load
03:12 Transient loading types
03:30 Base excitation
03:40 Three ways to define MSUP transient loads
04:05 Loads applied as stepped
04:19 Loads applied as ramped
07:12 Setup of MSUP transient analysis in Mechanical
08:47 Application of excitation force in Mechanical
10:21 Post-processing of transient results

Simulation Files

Download the accompanying geometry and archived files here. Ansys Student can be downloaded for free here.