| Wear can lead to consumption of the surface material of mechanical parts,and the failure of the parts cause the failure of the mechanical equipment.Ferrography technology provides an effective method for monitoring the operating conditions of mechanical equipment.The observation of the particles deposited on the analytical ferrogram is the main means,and the common deposition of the particles and impurities increases the complexity of the observed images,making the quantitative analysis inaccurate for both the total and the partial observations.Direct analysis of the size and number of particles in the image makes quantitative analysis more accurate.The location of about 30000 different available images on a analytical ferrogram,and the information obtained by only one location is incomplete and all analysis is unnecessary and unrealistic.Therefore,it is necessary to conduct in-depth research on the location and number of captured image on the analytical ferrogram for quantitative analysis.At present,when analyzing a ferrographic image,the technology of computer image recognition is getting rid of the dependence on the experience of the analysts in the traditional ferrography qualitative analysis.This paper is aimed at the rules of the image acquisition.On the basis of guaranteeing to obtain the information of the whole ferrogram,and the sampling scheme is normalized,which lays the foundation for the realization of the automation of image analysis.The research contents include:(1)The mathematical model of the flow pattern of the analytical ferrogram was established,and the factors affecting the deposition of the abrasive particles were analyzed.The expression of the deposition position of the abrasive particles on the ferrogram was obtained.The influence of the size of the abrasive particles,the abrasive material,the initial height of the abrasive particles into the analytical ferrogram and the irregularity of the particle shape on the position of the abrasive particles was analyzed.(2)A feasible experimental scheme which aimed at the image acquisition on ferrogram was found.Through the analysis of wear particles kinematics and combining the feature of the Weibull distribution,the scheme of image acquisition along the length of ferrogram was determined.Using the method of theoretical analysis and experiment,the scheme of image acquisition along the width of ferrogram is determined.(3)Experimental data was analyzed and experimental scheme is simplified.Three kinds of experimental data processing methods which can simplify the process of taking the points was proposed:probabilistic statistics,trend analysis and fuzzy mathematics comprehensive evaluation method,while ensuring that the sampling points can fully express the descriptive information of the whole ferrogram.Compared with thesimplified sampling solution,the number of sampling points greatly reduced and the efficiency greatly improved.(4)Tracking and monitoring the actual locomotive to verify the conclusion.The continuous tracking of the actual running locomotive verified the feasibility of sampling solution. |
