Rotor is mounted on journal bearings. is cylindrical support be used in analysis

- August 27, 2024 at 11:48 am
  
  Sudhakara G
  Subscriber
  
  Hi,
  The geared rotor is supported on the journal bearings on either side. I would like to estimate the expansion of gearwheel under various speeds.
  Is it ok to use cylindrical support as B.C (boundary condition) in the region of journal bearing?
  
  Thanks,
  Sudhakara
- August 28, 2024 at 1:24 pm
  
  Ashish Khemka
  Forum Moderator
  
  Hi,
  You can try defining bearings: 9.12. Bearings (ansys.com)
  Regards,
  Ashish Khemka
- August 29, 2024 at 11:12 am
  
  Sudhakara G
  Subscriber
  
  Hi,
  I have carried out the analysis with cylindrical supports – the expansion is 90 microns.
  The same analysis with journal bearing (with stiffness & damping properties ) gave 220 microns of expansion.
  I am not able to comprehend the deviation in results.
  Please clarify, which support is correct.
  
  Regards,
  Sudhakara
- August 29, 2024 at 12:07 pm
  
  Ashish Khemka
  Forum Moderator
  
  Hi,
  Did you turn on the large deflection? If not then please try turning on the large deflection under analysis settings.
  Regards,
  Ashish Khemka