An on-line ferromagnetic wear debris sensor for machinery condition monitoring and failure detection
| Autor: | K. W. Chambers, C. A. Waggoner, M. C. Arneson |
|---|---|
| Rok vydání: | 1988 |
| Předmět: |
Materials science
Nuclear engineering Mechanical engineering Condition monitoring Surfaces and Interfaces Condensed Matter Physics Debris Surfaces Coatings and Films Inductance Mechanics of Materials Electromagnetic coil Magnet Materials Chemistry Transient (oscillation) Radio frequency Current (fluid) |
| Zdroj: | Wear. 128:325-337 |
| ISSN: | 0043-1648 |
| DOI: | 10.1016/0043-1648(88)90067-1 |
| Popis: | Wear debris analysis is widely used to monitor the condition and predict the failure of oil-wetted components in machinery. Because of deficiencies in conventional methods of application, which involve periodic laboratory analysis of oil samples, interest in potential on-line methods is accelerating to satisfy demands for greater reliability assurance and maintenance economy. Thus far, concepts based on ferromagnetic particle sensing principles have shown the greatest promise. In this paper, a novel sensor capable of continuously monitoring cumulative ferromagnetic wear debris in lubricating oil scavenge lines is described. Suspended particles are alternately trapped electromagnetically and released through the inductance coil of a radio frequency oscillator, causing a frequency transient proportional to debris mass. By virtue of the pre-concentration of particulate debris, high detection sensitivity of the order of 1 ppm iron is achieved. Trapping magnet current and frequency measurement are regulated and monitored using a microprocessor-controller. Validation of the system under simulated machinery operating conditions was accomplished with an experimental oil circulation test loop to which measured amounts of particulate iron were introduced. System variables, including magnet current, oil temperature and viscosity, linear flow velocity, wear particle size and nitrogen and water entrainment, were observed to influence sensor response. For a given set of operating parameters, however, the response was directly proportional to the mass of ferromagnetic material. Results of a subsequent field evaluation trial on a test gearbox confirmed the feasibility of the sensor for practical on-line application. |
| Databáze: | OpenAIRE |
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