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

(1)为了提高用粒子计数器测量小粒子的性能，对研制的粒子传感器进行了改进。此外，我们完成了传递矩阵法，从粒子传感器得到的结果和各粒径粒子的脉冲高概率中数学计算出粒径分布。(2)利用光学显微镜、CCD相机和频闪示波器构建了一套在线图像分析系统，用于分析润滑油中磨损颗粒的形状。验证了该观测系统的可靠性和有效性。(3)利用在线观测系统对轴承金属（LBC3）磨损试验用润滑油中的磨损颗粒进行了在线分析。研究发现，磨损颗粒的展弦比和坚固度随摩擦系数和比磨损率的变化而变化。(4)在轴承金属（WJ2）磨损试验过程中，利用颗粒计数器实时监测润滑油中磨损颗粒的尺寸分布和数量密度。磨损颗粒的分布随磨损过程或接触载荷的变化与磨损损失的变化相对应，因此颗粒分析与磨损模式之间存在相关性。根据这些结果，我们开发的使用颗粒计数器的监测系统能够实时预测润滑磨损的严重损害。

(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.