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compared to the aerostatic system Examples of this type of bearing include the read write head flying over a spinning disk (Figure 71), crankshaft journals, camshaft journals, and thrust bearings for electrical generator turbines
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73 AEROSTATIC BEARINGS
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In contrast to aerodynamic bearings, aerostatic bearings can bear loads at a zero speed Air bearings offer a solution for many high-tech applications where a high performance and high accuracy are required Aerostatic bearings require an external pressurized air source due to which aerostatic bearings are also sometimes known as passive air bearings Pressurized air is introduced between the bearing surfaces through precision holes, grooves, steps or by using porous compensation techniques and discharges through the edges of the bearings (Figure 72) If the correct design is used, a very high stiffness can be obtained The aerostatic bearing is able to support a higher load than the aerodynamic bearing, but it requires a continuous source of power for supplying pressurized air Overall, aerostatic bearings perform well in most aspects such as having a long life, noise-free operations and are free from contamination Fig 72: Aerostatic bearing [4] Since air has a very low viscosity, the bearing gaps need to be small, of the order of 1 10 m As the object floats on a thin layer of air, the friction is extremely small and even zero when stationary [4] Because aerostatic bearings have a pressurized air source, an air gap can be maintained in the absence of a relative motion between the bearing surfaces
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731 Principle of Aerostatic Bearings
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Figure 73 shows how gas at a supply pressure, Po is admitted into the clearance through a restricting device, which reduces the supply pressure The pressure drop is due to the acceleration of the gas as it expands The air will flow through the bearing and back to the atmosphere where the pressure further reduces to the atmospheric pressure, Pa A smaller clearance will reduce the pressure drop that gives a higher load capacity It is desirable to achieve an optimum condition at which a maximum stiffness occurs where the rate of change of load when divided by the rate of change of clearance is a maximum Figure 74 shows that when no load is applied, the shaft is concentric in the bearing However, with the subsequent application of load, the clearance at the bottom of the shaft reduces The air
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Fig 73: Principle of aerostatic bearing operation [1]
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flow through the bottom of the shaft is restricted, and thus the pressure increases to a level that is higher than the pressure at the top half This pressure difference balances the applied load The pressure inside the gap is limited only by the available supply line pressure and material strength A standard 8 in (200 mm) diameter air bearing will support up to 1,750 lbs at 60 psi, and 2,300 lbs at 80 psi The load capacity is simply a function of the supply pressure, bearing area and
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Fig 74: The aerostatic journal bearing [3]
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the efficiency factor Air bearings typically function well at efficiencies of 40% for small bearings and up to 60% for larger units If the applied load is within the designed capacity, the shaft will have a certain equilibrium position The actual shaft radial deflection expressed as a fraction of the mean radial clearance is termed as the eccentricity ratio, e The relation of the eccentricity ratio with the load capacity is given in Figure 75 For a concentric position, the load coefficient at a given eccentricity ratio is also influenced by the gauge pressure ratio, Kg, as shown in Figure 76 The actual load coefficient in application will be somewhat lower than that of the theoretical value Kgo =
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