Frequency Analysis of a rotating shaft

Aim :

To create a model in Solidworks according to dimensions that you see fit and Conduct a frequency analysis and apply a bearing fixture on the stepped face of the rod at the two ends and perform the analysis. Find out 5 mode shapes and list the resonant frequencies.

Modelling :

The dimensions of the model are as given above. The material chosen was Alloy Steel. Default Mesh Size was used for the analysis.

Simulation :

Mode 1:

Mode 2 :

Mode 3

Mode 4

Mode 5

Results :

1. In the 1st mode shape, the critical frequency is very low because the plate at the centre is placed at onne of the antinodes and hence does not all for any movement.

2. In the 2nd mode shape, we notice a movement in the shaft in the Y direction and 2 nodes and 1 antinode.

3. The 3rd mode shape shows a movement along the X direction with 2 nodes and 1 anitnode.

4. The 4th mode shape shows movement in Y- direction and has 3 nodes and 2 antinodes.

5. In the 5th mode shape we notice 3 nodes and 2 antinodes with movement in the X- direction.