Page 24 - Using ANSYS for Finite Element Analysis Dynamic, Probabilistic, Design and Heat Transfer Analysis

Dynamic analysis • 11
For ANSYS version lower than 7.0, the “Variable Viewer”
window is not available. Use the “Define Variables” and “Store
Data” functions under TimeHist Postpro. See the help file for
instructions.

1.2 tutoriaL 2: modaL anaLysis of
struCture

In this tutorial, the modal analysis of a cantilever beam will be addressed.
Modal analysis—used to calculate the natural frequencies and mode
shapes of a structure. Different mode extraction methods are available.
This tutorial was created using ANSYS 7.0. The purpose of this tutorial
is to outline the steps required to do a simple modal analysis of the
cantilever beam shown as follows.

0.01 m

0.01 m
1.0 m

6
Modulus of elasticity (E) = 206800(10 ) N/m 2
Density = 7830 kg/m 3

1.2.1 Step-by-Step ANSyS SolutioN

1.2.1.1 Preprocessing: Defining the Problem

The simple cantilever beam is same as used in the previous tutorial.

1.2.1.2 Solution: Assigning Loads and Solving

1. Define analysis type
Solution > Analysis Type > New Analysis > Modal ANTYPE,2
2. Set options for analysis type:
Select Solution > Analysis Type > Analysis Options..