Frequency Analysis of a rotating shaft

Aim: To perform frequency analysis on a circular disc mounted on a stepped shaft.

Model:

A circular disc with stepped shaft is as shown in figure below,

The dimension for the model are as follows,

Diameter of disc = 100mm

Thickness os disc = 10mm

Shaft Diameter = 20mm

Shaft Length = 300mm

The taper part of shaft is 12.5mm in diameter and 15mm in length at each side.

The model would be mounted on bearing at taper part. In this scenario there will be certain frequencies at which model will experience resonance with characteristics mode shape. These mode shape and correspondign frequency would be found out using frequency analysis.

Analysis Setup:

For frequency analysis, frequency is selected from new study dialog box. The bearing fixture is applied to taper part of shaft (i.e. shaft ends). The material choosen for the model is Alloy Steel. Element size for meshing is choosen as 5mm. The meshed geometry is as shown below,

Results:

Mode shape 1:

Mode shape 2:

Mode shape 3:

Mode shape 4:

Mode shape 5:

Frequencies of Mode Shapes: