Need support in developing Simulink and simscape model to develop Vibration analysis of Journal Bearing

Journal bearings are the most commonly used elements in high speed rotating machinery and therefore there is a great need for their proper performance and quality lubrication to achieve normal rotary operation. Oil whirl and oil whip are common failures of journal bearings and are caused by instability of the oil film, especially when the rotational speed of the shaft exceeds the critical speed of the rotor system.

Answer 1

[Raj]

Hi Basavaraja

I understand that you wish to develop a model to perform vibrational analysis of Journal Bearing.

I would suggest you few steps that will help you in the same-

1. First basic step is to create a Simulink model to represent the bearing system. You can use relevant blocks from Simulink library browser for the same.
2. Determine the forces and excitations acting on the journal bearing. These may include external loads, rotational speeds, friction etc.
3. Next step is to perform vibrational analysis. You can add appropriate sensor blocks to detect capture necessary data. You can also use signal processing blocks to analyse the vibration signals, such as Fast Fourier Transform (FFT) or power spectral density estimation blocks.

You can also the export data to MATLAB for further processing. MATLAB provides Signal Processing Toolbox which has functions that let you study and characterize vibrations in mechanical systems.

For more information on this, you can refer to the following resources:

1. Creating Simulink models: https://www.mathworks.com/help/simulink/index.html
2. Vibrational Analysis in MATLAB: https://www.mathworks.com/help/signal/vibration-analysis.html

I hope this resolves your query!