Transcript MODELING OF MECHANICAL SYSTEMS BY ANSYS Example:2.1 k ω=18.71 rad/s=2.98 Hz  m m * Run ANSYS Interactive* Set Working Directory k=35000 N/m k m=100 kg* Run Notepad text editor.

MODELING OF MECHANICAL SYSTEMS BY ANSYS
Example:2.1
k
ω=18.71 rad/s=2.98 Hz

m
m
* Run ANSYS Interactive
2
* Set Working Directory
k=35000 N/m
k
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
r,1,0,100
d,all,uz,0
Command Window
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
real,1
finish
General Postproc > Results Summary
e,2
type,2
File>Clear&Start New...>OK>YES
real,2
e,1,2
eplot
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
Homework 01C - Problem 4:
L2
L1
y1
yA
3 G
1
k
c
m,I
4
Soluiton by ANSYS:
/prep7
et,1,beam3
et,2,mass21
et,3,combin14
r,1,0.2,7e-4,0.1
r,2,0,1050,0,0,0,670
r,3,35300,2000
mp,ex,1,200e9
n,1,0,0
n,2,3.1,0
n,3,1.7,0
n,4,0,-0.25
n,5,3.1,-0.25
2
k c
y2
yB
m=1050 kg, I=670 kg-m2
k=35300 N/m, c=2000 Ns/m
L1=1.7 m, L2=1.4 m
yA and yB are the inputs,
y1 ve y2 generalized
coordinates.
f1=1.2968 Hz, f2=2.5483 Hz
5
type,1
real,1
mat,1
e,1,3
e,3,2
type,2
real,2
e,3
type,3
real,3
e,1,4
e,2,5
eplot
/solu
d,all,ux,0
d,all,uz,0
d,4,uy,0
d,5,uy,0
antype,2
modopt,lanb,2
solve
finish
General Postprocessing>
Results Summary