Frequency Analysis of a rotating shaft

FREQUENCY ANALYSIS OF A ROTATING SHAFT

AIM
To find out the critical frequencies of a rotating shaft in SOLIDWORKS.
To model the shaft and find out 5 mode shapes and list the resonant frequencies.

5 MODES
There are bacically 6 modes for rigid bodies.
They are
-X Translation
-Y Translation
-Z Translation
-X Rotation
-Y Rotation
-Z Rotation
Here we will be only getting 5 modes only because one of the rotational mode will not have effect on shaft beacuse of the bearing support we have given.(that particular one rotation mode will depend on the coordinate system we have drawn our shaft.)

SIMULATION
The model is designed as per our decisions.
Then the frequency analysis is done.
The bearing support is used.
The medel is meshed and run.
The results are obtained.

MODEL

Total lenght 350mm
Bigger circle 120mm

Part link

 https://drive.google.com/drive/folders/1zc6uUxlA5CkeeGfmWMfOn2FxOc-SDczn?usp=sharing

RESULT

Mode1

Mode2

Mode3

Mode4

Mode5

RESONANT FREQUENCIES

CONCLUSION
It can be observed that the frequencies for the rotation mode is higher that translational modes.
It can also be observed that rotational mode along z axis is not obtained due to bearing support and this particular geometry.