What is the use squeeze film dampers?
What is the use squeeze film dampers?
Squeeze film dampers are used to shift critical speeds and/or to increase the dynamic stability of a rotor/bearing system. One of the key features of a squeeze film damper is the introduction of support flexibility and damping in the bearing/support structure.
Which fluid is used in damper?
The fluid inside the damper is usually throttled through the orifices at the piston due to pressure difference. The frequent throttling of fluid changes the velocity of the fluid to cause increase in temperature, thereby dissipating energy. The commonly used fluids for dampers are synthetic oil, mineral oil etc.
Who invented MR fluid?
The discovery of magnetorheological fluid (MRF) goes back to 70 years ago by Rabinov [1] at the US National Bureau of Standards.
What is a fluid film bearing?
In a hydrodynamic fluid film bearing, the film pressure that separates the surfaces is created by the relative motion (rotation) of the surfaces as the lubricant is pulled into a converging geometry between the surfaces. No contact of the surfaces takes place except during start-up and shutdown.
Who invented magnetorheological dampers?
the Delphi Automotive corporation
MagneRide is an automotive adaptive suspension with magnetorheological damper system developed by the Delphi Automotive corporation, during a period when the company was a subsidiary of General Motors (GM), that uses magnetically controlled dampers, or shock absorbers, for a highly adaptive ride.
WHAT IS MR fluid made of?
The MR fluid is composed of micro/nanometer ferromagnetic particles, carrier fluids, and some additives. Among them, the performance of ferromagnetic particles will mainly affect the sedimentation stability and the magnetic saturation of the MR fluid.
What is the major difference between ER and MR fluids?
The ER device was built as a squeeze cell incorporating an ER fluid sandwiched between two electrodes which, during impact, move towards each other, whilst the MR device was a commercially available vibration absorber.
How do air bearings work?
An air bearing is a non-contacting system where a gas film (usually air) acts as the lubricant that separates the two surfaces in relative motion – typically this being a rotating shaft, and a stationary radial journal or axial thrust bearing.