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Externally Pressurized Bearings and Machinery Diagnostics

Excerpt

In previous sections of this book, we have discussed machinery diagnostics from the point of view of conventional bearing technology. The technology continues to evolve, and new bearing developments promise to change the behavior of machines and the way we look at machinery data. The externally pressurized bearing is undergoing rapid development, and, because of its external pressure source, it has the capability of producing variable spring stiffness under operator or automatic control. As the externally pressurized bearing enters general use, it promises to change rotor behavior in ways that will affect diagnostic methodology.

Types of Bearings
Internally Pressurized Fluid-Film Bearings
Externally Pressurized Fluid-Film Bearings
Stiffness and Modal Damping in Fluid-Film Bearings
Variable Stiffness in Internally Pressurized Bearings
Variable Stiffness in Externally Pressurized Bearings
Rotor Dynamic Implications of Variable Stiffness Bearings
Diagnostic Implications of Variable Stiffness Bearings
Summary
References

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