基于非等间隔采样的曲轴连杆颈测量技术研究

针对曲轴测量机主轴颈和连杆颈同步测量中高精度的需求,提出多测头测量方法和非等间隔采样的高斯滤波方法。在同步测量的基础上设计多测头的测量方法,将测量数据相加以消除谐波,达到分离误差的目的。根据连杆颈的测量过程建立真实采样角度分布函数,计算每个采样角对应的高斯权函数,将权函数与该角度对应的采集数据在空间域进行离散循环卷积运算,获得滤波后有效的圆轮廓数据。最后将修正后的测量结果与原测量结果进行比对,修正后曲轴四段连杆颈的测量误差值明显减小,精确度显著提高。

Research on Measurement Technology of Crankshaft Connecting Rod Journals Based on Non-equal Interval Sampling

In order to meet the requirements of high accuracy in the synchronous measurement of the main journals and connecting rod journals of crankshaft measuring machines, a multi-probe measurement method and a Gaussian filtering with non-equal interval sampling were proposed. On the basis of synchronous measurement, a multi-probe measurement method was designed, which might add the measured data to eliminate the harmonics and achieve the goal of separating errors. According to the measuring processes of connecting rod journals, the real sampling angle distribution function was established, and the corresponding Gaussian weight function of each sampling angles was calculated. The weight function and the collected data corresponding to the angle were subjected to discrete cyclic convolution operation in the spatial domain to obtain the filtered effective circular contour data. Finally, the corrected measurement results were compared with the original measurement results. The measurement errors of the four connecting rod journals of the crankshaft is significantly reduced, and the accuracy is significantly improved.