LANG STEINHILPER GLEITLAGER PDF

The monitoring of the bearing back temperature, which is often used to supervise bearings, clearly reacted later than the AE signal. In this region, the two machine surfaces are separated by a lubricant film. These vibrations are attributed to the noise emitted by the test bench motor. Failure-free running machines demand efficient and reliable monitoring systems, which can report on the current condition of the bearing arrangement while in operation. This procedure clarifies that with the AE signal a bearing failure can be recognized seconds before it occurs. This response is characteristic to all the tests conducted and was observed in the generation of bearing damage.

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The monitoring of the bearing back temperature, which is often used to supervise bearings, clearly reacted later than the AE signal. In this region, the two machine surfaces are separated by a lubricant film.

These vibrations are attributed to the noise emitted by the test bench motor. Failure-free running machines demand efficient and reliable monitoring systems, which can report on the current condition of the bearing arrangement while in operation. This procedure clarifies that with the AE signal a bearing failure can be recognized seconds before it occurs. This response is characteristic to all the tests conducted and was observed in the generation of bearing damage. In this instance, a bearing failure could be induced by applying slight loading forces.

After testing, the sliding bearing was classified as defective. Monitoring Lubrication Regimes in Sliding Bearings This transition is reflected in increasing noise levels at the measured curve. The AE-sensor was mounted on the outside of the housing Figure 3. Bearing damage could always be recognized before the initial stage of a failure which was expressed by increasing torque.

Toggle navigation Toggle search. This range of measurements will not be taken into account in the subsequent signal evaluation. Friction and wear increase quickly, leading finally to a failure of the bearing. For continuous surveillance systems, significant storage and processing capacity is required to manage the relatively large amounts of data and processing algorithms.

Figure 4 shows the frequency spectrum for an undamaged surface under hydrodynamic condition and slight load is shown against the frequency spectrum for a failed bearing. On the basis of these severities, this measurement procedure shows a large potential for a practical use in the early recognition of bearing failures. The characteristic curve falls to a minimum value and then increases.

Under unfavorable circumstances, the minimal lubricating gap becomes so small that a complete hydrodynamic separation of shaft and bearing is no longer guaranteed. In the audible sound range, environmental interferences are so large that the measuring signal is no longer useful. How to Tell the Difference.

Result of Static Applied Load Test on Half-shell Glyco 40 Bearing In Figure 6, the value of this integral is given next to the progress courses of load, torque and bearing back temperature. This can be caused in boundary, mixed or elastohydrodynamic lubrication regimes as well as by the appearance and propagation of cracks, fracture processes, cavitations phenomena and phase changes, or through plastic deformations. The initial bearing damage can be recognized where the loading force at the bearing was gradually increased up to 4.

A detailed examination of the variables, which are normally involved in the friction process, determined that physical and mechanical parameters of the friction surface, where steel surfaces were involved, did not generate appreciably differing results. 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.

The progress of the bearing damage can be clearly observed. This causes a saturation of many machine components, for example, sliding bearings. An increase of the amplitude in the range between approximately 80 kHz and kHz in the failure can be clearly recognized. Sealed or Shielded Bearings? The success of a continuous surveillance system will depend on its configuration relative to the specific mechanical interactions. Measurement of the noise level can be done far away from the metallic contacts, even outside of the housing, and therefore requires no type of mechanical changes in the engine compartment.

The new procedure ,ang proposes the use laang both frequency and amplitude to prematurely detect bearing failures. 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.

The test bench enables testing with half- and complete shells. Create your own user feedback survey. These results support an argument for the use of AE analysis to be used as a condition surveillance method for sliding bearings based on the correlation between the friction condition and the measuring average noise level. To document the progress of the bearing failure, the acoustic signal was measured and evaluated steinhiper every second.

These analyses use only part of the information contained in the AE signal. Deutsches Komitee Instandhaltung Veranst. Acoustic Emission Mean Amplitude vs. In the case of the impulse density measurement only the frequency is used, and in the case of the effective value measurement only the amplitude is used. The loading force was increased to the point where asperity contacts began to occur. The evaluation of machines by noise monitoring in the audible sound range is a commonly used steinhilpeg.

The result of the measurement using a Glyco 40 half-shell under slowly increasing continuous load, with a speed of 3, rpm, is represented in Figure 5. Acoustic emission analysis also has an extra advantage with the AE-sensor. Most 10 Related.

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LANG STEINHILPER GLEITLAGER PDF

Kagar 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. Search results 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.

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Gleitlager

Kiganris To document the progress of the bearing failure, the acoustic signal was measured and evaluated continuously every second. How to Tell the Difference. This response is characteristic to all the tests conducted and was observed in the generation of bearing damage. Sliding Bearing Test Methods seinhilper Apparatus The test bench consists of a steel shaft supported by two bearings. Stribeck Curve The region up to the minimum of the Stribeck-curve is determined through boundary and mixed lubrication. Measured parameters such as speed, driving torque, loading force, bearing rear temperatures and inlet lubricant temperature were determined. The adjusted limiting of noise level plays a central role in this procedure, while amplitudes too high or langg low can generate incorrect diagnostics.

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Shagami To the right of the mixed lubrication regime, the subsequent increasing of the Stribeck-curve is referred to as the elastohydrodynamic regime. The characteristic curve falls to a minimum value and then increases. Frequency Spectra of Undamaged Bearings Figure 4 shows the frequency spectrum for an undamaged surface under hydrodynamic condition and slight load is shown against the frequency spectrum for a failed bearing. In the case steinhiper the impulse density measurement only the frequency is used, and in the case of the effective value measurement only the amplitude is used. High value is placed on the construction of compact machines and, therefore, improved thermal and mechanical efficiency is required.

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