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Measurement of Transfer Paths for Bearing Diagnostics

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Common methods of assessing the degree of damage inside rolling bearings are based on empirical methods and on measurements of the signal generated by an existing damage. To know the remaining service life of a rolling bearing one should try to access the condition of the bearing's surfaces. The evaluation of the causal relationship between roughness and arising structure-borne-sound is an essential task. In order to describe the mechanism of sound generation a physical model has to be developed. In addition the knowledge of the transfer path between excitation source within a machine to its housing is necessary to consider the modification and attenuation of the measured vibration. This work concentrates on the determination of the transfer path of mounted rolling bearings. In general, these measurements are carried out using a shaker as excitation source making it necessary to dismount the machine. This paper describes a new method to obtain transfer paths with the help of a special piezo transducer built from one of the bearing's rolling elements. The realized results are closer to the real situation because an unmodified unit is investigated. The calibration of the transducer, sensors and the measurement equipment is also carried out in order to compensate any deviation introduced by the measurement chain. The influence of the transducer's position inside the bearing and of the radial load is investigated. The results indicate that this is an useful method to determine transfer paths.
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Document Type: Research Article

Publication date: September 1, 2003

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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