非接触式纵梁折弯高度检测方法研究

Research on Method of Non-contact Bending Height Detection of Longitudinal Beam

随着变宽度车架使用越来越多,各种非接触式测量方案应用越来越广泛。借助非接触式距离测量设备,快速检测变宽度车架的Z型面高度差,在此基础上通过多点测量、统计数据极大似然估计,构建数学模型,运用最小二乘法拟合直线,并利用计算点与直线的距离来快速判断测量平面与基准平面的间距的方案。通过多次测量以及统计学分析,可实现使用低精度设备达到高精度测量的思路,系统误差约为原来的2/3。研究结果可为快速检测车架纵梁折弯高度提供依据,在大幅度提升测量效率的同时保持较高的稳定性。

With the increasing use of variable-width frame and the application of various non-contact measurement schemes,the Z-shape height difference of variable-width frame was quickly detected by means of non-contact distance measuring equipment.And based on this,the maximum likelihood estimation was obtained by multi-point measurement and statistical data maximum likelihood estimation.A mathematical model was constructed,a straight line was fitted by using least square method,and a distance between a measurement plane and a reference plane was quickly judged by calculating the distance between a point and the straight line,and a high-precision measurement scheme could be realized by using low-precision equipment through multiple measurements and statistical analysis.The system could realize the system error to be about 2/3 of the original.The research results provided basis for rapid detection of bending height of frame longitudinal beam,which could greatly improve the measurement efficiency and maintain high stability.