Experimental Study on Digital Holographic Measurement of Wear Particles in Lubricating Oil of Wind Power Gearbox
On-line monitoring of wear particles in lubricating oil can help to evaluate the operating status of wind turbine gearbox in time,which is of great significance for the early warning of potential faults.This paper established an online monitoring experimental system of lubricating oil wear particles based on digital holography.The lubricating oil containing different particle sizes and different concentrations of wear particles was measured,and the measurement results were compared with those of the laser particle size analyzer.The results show that in the particle size range of 20-350 μm,particle size distribution measured by the holographic method is consistent with those of the laser particle size analyzer,and the measurement error of the median diameter Dv50 is less than 6%.In addition,digital holography can not only accurately measure the size of wear particles but also obtain the morphology characteristics of particles synchronously,which can assist in the analysis of gearbox wear degree and wear part.In conclusion,digital holography is valuable for further research and on-line application in monitoring of lubricating oil wear particles.
digital holographylubricating oilwear particleson-line monitoring
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