Mechanical APDL Structural Analysis Guide

4.5.3. Problem Diagram

Figure 4.4:Two-Mass-Spring-System

Problem Sketch

k 1 kc k 2

m 1 m 2

F1 sin ωt

Representative Finite Element Model

3

k 1 kc k 2

m 1 m 2

1 5

2 4

Y

1 2 3 4

4.5.3.1. Set the Analysis Title

1. Choose menu path Utility Menu> File> Change Title.


2. Type the text "Harmonic Response of Two-Mass-Spring System" and click on OK.

4.5.3.2. Define the Element Types

1. Choose menu path Main Menu> Preprocessor> Element Type> Add/Edit/Delete.


2. Click on Add. The Library of Element Types dialog box appears.


3. Scroll down the list on the left to "Combination" and select it.


4. Click once on "Spring-damper 14" in the list on the right.


5. Click on Apply.


6. Scroll up the list on the left to "Structural Mass" and select it.


7. Click once on "3D mass 21" in the list on the right.


8. Click on OK.The Library of Element Types dialog box closes.


9. Click on Close in the Element Types dialog box.

4.5.3.3. Define the Real Constants

1. Choose menu path Main Menu> Preprocessor> Real Constants.

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Sample Harmonic Analysis (GUI Method)