Frequency Analysis of a rotating shaft
AIM TO PERFORM A FREQUENCY ANALYSIS ON A ROTATING SHAFT AND TO DETERMINE THE RESONANT FREQUENCIES.
INTRODUCTION
Natural Frequency analysis in SOLIDWORKS Simulation allows us to efficiently investigate the resonant frequencies of a design. This analysis type helps us ensure that the natural modes of vibration are well away from environmental forcing frequencies that a design might encounter during service. Like all analysis work, effective post-processing of your Natural Frequency analysis is key to communicating results to others. The standard output of a Natural Frequency analysis are the resonant frequencies and associated mode shapes of the design, which we can easily plot in SOLIDWORKS Simulation.
There are three additional frequency plot options added that are beneficial to conveying your Natural Frequency analysis results. Those plots, or Frequency Response Graphs, are Mode Number, Effective Mass Participation Factor (EMPF) and Cumulative Effective Mass Participation Factor (CEMPF).
PROCEDURE
- Creating rotating shaft in solidworks
3D CAD MODEL OF ROTATING SHAFT
02.IN NEW STUDY SELECT FREQUENCY ANALYSIS
03.APPLY MATERIAL PROPERTIES AS ALLOY STEEL
04.APPLY FIXTURES TO FIXED THE STEPPED FACE OF THE ROTATING ROD
05.APPLY MESH PARAMETER AS 2 mm
RUN THE FREQUENCY ANALYSIS
AMPLITUDE FOR MODE 01 :-
AMPLITUDE FOR MODE 02
AMPLITUDE FOR MODE 03
AMPLITUDE FOR MODE 04
AMPLITUDE FOR MODE 05
RESONANT FREQUENCIES
The Mode Number plot shows a graphical representation of the natural frequencies calculated by the analysis. This is a step up, in my opinion, from the simple list that is provided by right-clicking on the Simulation Results folder and choosing the option “List Resonant Frequencies”.
FREQUENCIES VS MODE NO. GRAPH
The second frequency response graph, Effective Mass Participation Factor (EMPF), helps us visualize how the mass is vibrating in X, Y and Z, for each natural frequency.
|
Mode No. |
Freq (Hertz) |
X direction |
Y direction |
Z direction |
|
|
1 |
507.71 |
1.16E-08 |
0.078198 |
0.7584 |
|
|
2 |
509.2 |
3.21E-09 |
0.75812 |
0.078166 |
|
|
3 |
933.22 |
1.84E-12 |
1.05E-07 |
2.58E-09 |
|
|
4 |
1,884.80 |
6.74E-08 |
8.42E-09 |
2.93E-09 |
|
|
5 |
1,887 |
4.85E-09 |
9.92E-08 |
1.30E-10 |
|
|
Sum X = 8.7085e-08 |
Sum Y = 0.83632 |
Sum Z = 0.83657 |
|||
CONCLUSION
FROM THIS ANALYSIS WE OBSERVB THAT ROTATING SHAFT SHOUD NOT BE OPERATED AT THE RESONANT FREQUENCIES IF WE DO THEN RESONANCE MAY LEAD TO DAMAGE OR FAILURE OF THE SHAFT.