Research On Key Technology Of Power Mechanical Equipment Flatness Measurement Which Is Based On Point Laser On-machine

At present,the on-site measurement of electrical machinery and equipment is difficult and inefficient,so manual measurement combined with numerical control processing is still the main way of maintenance.The point laser source has the characteristics of good directivity and stable precision.The laser sensor based on the principle of laser triangulation is the focus of non-contact measurement research.At the same time,the data obtained by point laser on-line measurement is in the form of laser signal,so there will be interference of incident angle,plane color,plane material,exposure time,mechanical vibration and other factors.The direct use of non optimized laser measurement equipment and point cloud data without data processing will bring serious calculation error.At the same time,the amount of point cloud data obtained by the point laser sensor is huge,which contains a large number of poor quality information.Direct data processing and calculation will waste computing resources and the calculation results are biased.Therefore,in order to solve the above problems,this paper takes the alloy surface of the thrust pad as the research object,and carries out the research on the structural design of point laser measuring electrical machinery equipment,the evaluation of point cloud flatness error,and the correction of point cloud flatness error.For the structural design requirements of on-board measurement system,three parts are designed based on the basic principle of mechanical design,including electromechanical control module,power mechanical module and laser measurement module.Firstly,the mechanical and electrical control module is developed based on 89C51 single chip microcomputer,and then the power mechanical module is designed by combining the stepping motor and the sliding table.Finally,the laser measurement module is designed based on the point laser sensor and data processing algorithm.The three modules can realize the on-machine measurement requirements of the point laser measurement system.For the problem of flatness error evaluation algorithm for point laser measurement,the intelligent algorithm(genetic algorithm,particle swarm optimization algorithm),geometric algorithm(convex hull theory),numerical algorithm(maximum straightness evaluation method,diagonal evaluation method,three-point evaluation method,minimum area evaluation method,least square evaluation method)for flatness error evaluation were derived in turn.Finally,the experimental results were compared The least square evaluation method is selected to calculate the flatness error.For the problem of flatness error correction in point laser measurement,the source of error is traced.The influence factors of incident angle,plane color,plane material and exposure time are demonstrated experimentally.Aiming at the influence factors of incident angle in controllable factors,the mathematical model of centrality correction is proposed;the accuracy calibration experiment is carried out to verify the usability of the laser sensor selected in this paper;data reduction algorithm and combined filtering algorithm are established for data fluctuation caused by external factors such as mechanical vibration,and the experimental results verify the effectiveness of the proposed reduction algorithm and filtering algorithm Feasibility.Finally,in order to verify the feasibility of the on-line measurement system for point laser power mechanical equipment,a data processing program is developed based on Python and MYSQL to realize the functions of data processing,database management,data visualization,flatness error calculation,etc.According to the research results of this paper,the flatness of the alloy surface of the thrust pad is calculated.Finally,it is compared with the standard data measured by coordinate measuring machine.The results show that the research content in this paper is feasible and provides ideas for the follow-up research.