1. MODELING OF MECHANICAL SYSTEMS BY ANSYS
Example:2.1
ω=18.71 rad/s=2.98 Hz m k
* Run ANSYS Interactive 2
k=35000 N/m
* Set Working Directory
m=100 kg 1
* Run Notepad text editor and write the following commands below.
/prep7
Save as e01.txt
et,1,mass21
/solu
et,2,combin14
d,all,ux,0
Write e01.txt in ANSYS Command Window
r,1,0,100
d,all,uz,0
r,2,35000,0
d,1,uy,0
n,1,0,0
antype,2
n,2,0,0.25
modopt,lanb,1
type,1
solve finish
real,1
General Postproc > Results Summary
e,2
type,2
real,2
File>Clear&Start New...>OK>YES
e,1,2
eplot

2. In Example 2.1,
* The command file is prepared with a text editor. (Notepad)
* The file is run in ANSYS
GUI can used by clicking ANSYS menu without preparing a command file.
et,1,mass21
Main Menu>Preprocessor>Element Type>Add/Edit/Delete>Add...>
Structural Mass>3D mass 21
The commands are recorded in a file with an extension of “.log”
The “.log” file can be examined in a text editor.
Help>Help on can be used for more information abut the ANSYS commnads.
In CAD/CAE programs like ANSYS:
* System elements and connections are defined in programs with commands
* Programs establish a mathematical model of a system, solve it and give results

3. Homework 01C - Problem 4:
m=1050 kg, I=670 kg-m2 k=35300 N/m, c=2000 Ns/m L1=1.7 m, L2=1.4 m G y2 y1 k c L1 L2
m,I yA yB
yA and yB are the inputs, y1 ve y2 generalized coordinates. 1 3 2
f1= Hz, f2= Hz 4 5
Soluiton by ANSYS:
/prep7
/solu
type,1
et,1,beam3
d,all,ux,0
real,1
et,2,mass21
d,all,uz,0
mat,1
et,3,combin14
e,1,3
d,4,uy,0
r,1,0.2,7e-4,0.1
e,3,2
d,5,uy,0
r,2,0,1050,0,0,0,670
type,2
antype,2
r,3,35300,2000
mp,ex,1,200e9
real,2
modopt,lanb,2
e,3
solve finish
n,1,0,0
type,3
n,2,3.1,0
real,3
n,3,1.7,0
General Postprocessing> Results Summary
e,1,4
n,4,0,-0.25
e,2,5
n,5,3.1,-0.25
eplot