Bearings – Rotary bearing – Fluid bearing
Patent
1993-12-20
1994-10-18
Hannon, Thomas R.
Bearings
Rotary bearing
Fluid bearing
384114, F16C 3206
Patent
active
053562259
ABSTRACT:
A bearing system including one or more bearings for optimizing stiffness of each bearing which includes an individual regulator, pressure meter and flow meter to each bearing. The meters send instantaneous values of pressure an flow rate to a computer system which performs an algorithm using the values and computes target signal values for each individual bearing. These values are then transmitted to the respective pressure regulators. The pressures applied by the regulators are maximum values with which the bearing can operate without going into vibration. One algorithm that the computer uses is to compute an "impedance" value of the bearing which is defined to be P/S where P is the pressure measured by the pressure meter and S is the flow rate measured by the flowmeter. This approach assumes that the actual effective pressure in the bearing is at last proportional to the pressure measured at the meter. If Pm and Sm are the pressure and flow rate respectively when the bearing pressure is just below a value where the bearing starts to resonate, then the computer works toward maintaining the pressure P and flow rate S at values where P/S=Pm/Sm. In another embodiment, after load is applied at a location with respect to the bearing, the computer computes pressure in the various bearings depending on where the load is located and value of the load so that total force and moment on the bearings equals zero. The invention is applicable to bearings relying on hydrodynamic and hydrostatic forces.
REFERENCES:
patent: 3555865 (1971-01-01), Sebastian
patent: 3772296 (1973-03-01), Fox
patent: 4569562 (1986-02-01), Sato et al.
patent: 4643592 (1987-02-01), Lewis et al.
patent: 4930907 (1990-06-01), Smith
patent: 5066197 (1991-11-01), Champagne
Hanes Charles E.
Smith Robert S.
Hannon Thomas R.
Samuel Smith Robert
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