Research On Algorithm Of Key Parameters For The Comprehensive Measurement Of Crankshaft

At present,the inspection of crankshaft mainly relies on imported equipment and special measuring tools,but the high cost of imported equipment and inefficient measuring methods of special measuring tools seriously restrict the potential of domestic automobile market.In order to solve the technical barriers in the field of crankshaft detection in China,it is necessary to research on the evaluation algorithm of crankshaft key parameter errors,which provide algorithm support for the self-developed crankshaft integrated measuring instrument to effectively realize one-time clamping and multi-parameter measurement.In this paper,the system composition,probe characteristics and working principle of crankshaft comprehensive measuring instrument are analyzed.The evaluation scheme of key parameter errors are given.Based on the evaluation schemes and equipment characteristics,the traditional algorithm of crankshaft key parameter errors are designed.The evaluation algorithm of crankshaft key parameters are optimized by combining relevant optimization theory.The optimization algorithm of roundness error based on step acceleration,cylindricity error based on step acceleration,EIV model parallelism error based on the function of roundness error optimization,and phase angle error based on the combination of two-dimensional feature points and type A uncertainty are proposed.Simultaneously,the optimization algorithm of multi-objective stroke error is also proposed.The modular programming and simulation verification of related parameter algorithms are realized by using MATLAB 2016 a.The roundness error and cylindricity error evaluation algorithm are verified and analyzed by data obtained from Hibson Talyrond 290.The results show that the roundness,cylindricity and parallelism error optimization algorithms proposed in this paper are highly consistent with the pre-optimization algorithm in the results,but the evaluation efficiency of the optimization algorithm is improved significantly compared with the general algorithm,in which the running time of the cylindricity error and parallelism error optimization algorithms are increased by 27.8% and 13.9% respectively;the degree of deviation of the evaluation results from the set values is improved from 0.11% to 0.042% by the phase angle error optimization algorithm,which ensures the reliability of the results;the accuracy of results that evaluated by the stroke error optimization algorithm is better than the evaluation results evaluated by general algorithm.Thus,the correctness and efficiency of the error optimization algorithm for crankshaft key parameters are verified.