Experimental Study on the Apparatus for Rubbing Surface Damage Diagnostics by Means of On-Line Observations of Wear Particles in Lubricating Oil

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(1) In order to advance the performance of small particle measurement by means of a particle counter, we improved our developed particle sensor. In addition, we completed a transfer matrix method to calculate mathematically particle size distribution from the results obtained by the particle sensor and the pulse hight probability of each size particle.(2) An on-line image analyzing system using an optical microscope, a CCD camera and a strobo scope was constructed in order to analyze the shape of wear particles in lubricanting oil. The reliability and availability of this observation system were comfirmed.(3) The wear particles in the lubricating oil which was used in the wear tests of bearing metal (LBC3) were analyzed at on-line using our observation system. it is found that the aspect ratio and the ruggedness of wear particles vary with the friction coefficient and the specific wear rate.(4) During the wear tests of bearing metal (WJ2), the size distribution and number density of wear particles in lubricating oil were monitored at real-time using our particle counter. The variation of the distributions of the wear particles with wear process or contact load corresponded to that of wear loss, consequently there were correlations between the particle analysis and wear modes.From these results, our developed monitoring system using the particle counter is able to predict severe damage of lubricated wear at real-time.