Frequency Analysis of a rotating shaft

Aim: To find out the critical frequencies of a rotating shaft in Solidworks

Modeling :

We are using the dimensions as mentioned in the sketch below and using revolve feature we are converting the sketch into a 3D model

Simulation :

• Select the frequency analysis as the study for the simulation
• right-click on the frequency analysis study go to properties set the number of frequency to 5 to find the 5 mode shapes
• create the bearing fixtures on the stepped portion of the shaft by right-clicking on the fixture and selecting the bearing fixture
• create the finest mesh to have more accurate results
• run the simulation

Results:

Mode No.	Frequency(Rad/sec)	Frequency(Hertz)	Period(Seconds)
1	0.068508	0.010903	91.715
2	949.46	151.11	0.0066176
3	949.66	151.14	0.0066162
4	3763.8	599.02	0.0016694
5	3765.1	599.23	0.0016688

Conclusion :

From the data, we can say that the component is safe to use without the condition where the working frequency matches the resonant frequency we find.