alross
Mechanical
- Feb 4, 2004
- 5
I would be grateful to get some ideas for the simplest way to calculate the vibration/frequency response for an azimuth slew bearing.
The bearing is quite a large slew bearing which has a payload of 155kg with a defined C of G wrt the bearing. The bearing has ball bearings in a wire race. The manufacturer is currently calculating the bearing stiffness for me.
The size of the bearing is an outer diamter of ~400mm and an inner diameter of ~300mm. The bearing is ~30mm thick.
The bearing sits on top of the horizontal roof of a vehicle. The payload is the hung from (and bolted onto) the inner race of the bearing so that hangs into the vehicle. The bearing outer race is bolted onto the outside of the vehicle roof. The bearing is the only support for the payload.
After such a lengthy description (!) my question is:
Does anyone know a simple method to calculate the anticipated frequency response of the bearing? I'm willing to try either hand calcs or run a FEA model in Mechanica or Ansys. This is for the bearing in a static mode when it is not rotating, i.e., I'm interested in the non-rotational modes of the bearing only.
The frequency range that I am interested in is from 0Hz up 2kHz.
Thank you.
Alasdair.
The bearing is quite a large slew bearing which has a payload of 155kg with a defined C of G wrt the bearing. The bearing has ball bearings in a wire race. The manufacturer is currently calculating the bearing stiffness for me.
The size of the bearing is an outer diamter of ~400mm and an inner diameter of ~300mm. The bearing is ~30mm thick.
The bearing sits on top of the horizontal roof of a vehicle. The payload is the hung from (and bolted onto) the inner race of the bearing so that hangs into the vehicle. The bearing outer race is bolted onto the outside of the vehicle roof. The bearing is the only support for the payload.
After such a lengthy description (!) my question is:
Does anyone know a simple method to calculate the anticipated frequency response of the bearing? I'm willing to try either hand calcs or run a FEA model in Mechanica or Ansys. This is for the bearing in a static mode when it is not rotating, i.e., I'm interested in the non-rotational modes of the bearing only.
The frequency range that I am interested in is from 0Hz up 2kHz.
Thank you.
Alasdair.
