[9] Noack G. Berechnung hydrodynamisch geschmierter Gleitlager dargestellt [ 19] VDI Richtlinie ; Düsseldorf – [20] Lang O R, Steinhilper W. Gleitlager. VDI-Z. () 14, p. Lang, O.R.: Moderne Berechnungsverfahren bei der Auslegung von Dieselmotoren. 69 Lang, O.R.; Steinhilper, W.: Gleitlager. O.R. Lang and W. Steinhilper. Gleitlager. Springer, A. Boyaci, H. Hetzler, W . Seemann, C. Proppe, and J. Wauer. Analytical bifurcation analysis of a rotor.

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Speed of the shaft can vary between and 3, rpm. The test bearing is located between both supporting bearings, which can be loaded using a hydraulic cylinder with a static loading force of up to 60 kN 13, pounds Figure 3.

Machine-specific data collection parameters and data management functions will need to be developed to enable integration of the right criteria, and identification of incipient failure. Conclusions These studies demonstrated that acoustic emission analysis is an appropriate measurement procedure to detect incipient failures at sliding bearings through the correlation between the emitted acoustic signal and the energy dissipated in the sliding metallic contacts.

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The noise emerging from metallic contacts between sliding surfaces is measured with emission acoustic sensors and further evaluated by spectral analysis. Frequency Spectra of Undamaged Bearings.

Create your own user feedback survey. For continuous surveillance systems, significant storage and processing capacity is required to manage the relatively large amounts of data and processing algorithms.

Sealed or Shielded Bearings? In Figure 5, the variation in time of every frequency spectral analysis is properly arranged.


At the Institute of Product Development of the University of Karlsruhe, the procedure of acoustic emission AE analysis to detect damage in sliding bearings is being examined. In this region, the two machine surfaces are separated by a lubricant film. The adjusted limiting of noise level plays a central role in this procedure, while amplitudes too high or too low can generate incorrect diagnostics. The monitoring of the bearing back temperature, which is often used to supervise bearings, clearly reacted later than the AE signal.

Monitoring Lubrication Regimes in Sliding Bearings

All of the variables – shell material, speed, temperature and lubricant viscosity – are of interest. For the tests, lead-copper-tin-bearings of the type Glyco 40 and bronze-bearings with a diameter of Under unfavorable circumstances, the minimal lubricating gap becomes so small that a complete hydrodynamic separation of shaft and bearing is no longer guaranteed.

The new procedure principle proposes the use of both frequency and amplitude to prematurely detect bearing failures. Munsterman, About the Author M. To the right of the mixed lubrication regime, the subsequent increasing of the Stribeck-curve is referred to as the elastohydrodynamic regime.

The AE-sensor was mounted on the outside of the housing Figure 3. Therefore, it must be measured in an ultrasonic range, at approximately kHz, where normal operating vibrations of machines and engineering equipment have no influence. Metall 31Nr. The possibility of preheating the lubricant facilitated a further reduction of the loading capacity of the bearing due to the viscosity decreasing as temperature rises. Sliding Bearing Test Bench.

Acoustic Emission Mean Amplitude vs. Failure-free running machines demand efficient and reliable monitoring systems, which can report on the current condition of the bearing arrangement while in operation.


On the basis of these severities, this measurement procedure shows a large potential for a practical use in the early recognition of bearing failures. Antriebstechnisches Kolloquium Rheinland An increase of the amplitude in the range between approximately 80 kHz and kHz in the failure can be clearly recognized. Stribeck Curve The region up to the minimum of the Stribeck-curve is determined through boundary and mixed lubrication.

The region up to the minimum of the Stribeck-curve is determined through boundary and mixed lubrication. Sliding contacts at bearings, running surfaces of cylinders or cam transmissions have an essential influence on the mechanical operating conditions of machines, combustion engines or turbines. The test bench enables testing with half- and complete shells.

Further analysis is required to fully explain the extent to which each of the measured variables influence the acoustic signal.

The success of a continuous surveillance system will depend on its configuration relative to the specific mechanical interactions.

Acoustic Emission Analysis The evaluation of machines by noise monitoring in the audible sound range is a commonly used method. To establish a relationship between these results and the other measured variables at the test bench, the bleitlager of the frequency spectra values in ranges between 80 kHz and kHz was calculated to characterize the AE signal.