Abstract
This chapter provides an overview on data acquisition and practical vibration analysis. It discusses collection of machinery vibration, conversion of the vibration signal to an electrical signal, transformation of the electrical signal to its components, and providing information and documentation related to vibration data. To measure machinery or structural vibration, a transducer or a vibration pickup is used. A transducer is a device that converts one type of energy, such as vibration, into a different type of energy, usually an electric current or voltage. Commonly used transducers are velocity pickups, accelerometers, and Eddy current, or proximity probes. Each type of transducer has distinct advantages for certain applications. Eddy current transducers (proximity probes) are the preferred vibration transducers for vibration monitoring on journal bearing equipped rotating machinery. Typical applications are predominantly high-speed turbo machinery. Eddy current transducers are the only transducers that provide displacement of shaft or shaft-relative (shaft relative to the bearing) vibration measurements. Several methods are usually available for the installation of Eddy current transducers, including internal, internal/external, and external mounting.
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