ANSYS Mechanical application-Vibration Analysis

•In this chapter, performing free vibration analyses in Simulation will be covered.  In Simulation, performing a free vibration analysis is similar to a linear static analysis.

–It is assumed that the user has already covered Chapter 4 Linear Static Structural Analysis prior to this section.

•The following will be covered:

–Free Vibration Analysis Procedure

–Free Vibration with Pre-Stress Analysis Procedure

•The capabilities described in this section are generally applicable to ANSYS DesignSpace Entra licenses and above.

•For a free vibration analysis, the natural circular frequencies wi and mode shapes fi are calculated from:

•Assumptions:

–[K] and [M] are constant:

•Linear elastic material behavior is assumed

•Small deflection theory is used, and no nonlinearities included

•[C] is not present, so damping is not included

•{F} is not present, so no excitation of the structure is assumed

•The structure can be constrained or unconstrained

Mode shapes {f} are relative values, not absolute

•The free vibration analysis procedure is very similar to performing a linear static analysis, so not all steps will be covered in detail.  The steps in blue italics are specific to free vibration analyses.

–Attach Geometry

–Assign Material Properties

–Define Contact Regions (if applicable)

–Define Mesh Controls (optional)

–Define Analysis Type

–Include Supports (if applicable)

–Request Frequency Finder Results

–Set Frequency Finder Options

–Solve the Model

–Review Results

Get free full Tutorial!

Please send me email:

cadxneter@hotmail.com