Research on Method of Non-contact Bending Height Detection of Longitudinal Beam
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 meas-uring equipment.And based on this,the maximum likelihood estimation was obtained by multi-point measurement and sta-tistical 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 dis-tance between a point and the straight line,and a high-precision measurement scheme could be realized by using low-preci-sion equipment through multiple measurements and statistical analysis.The system could realize the system error to be a-bout 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.
least square methodrapid measurementregression lineerror analysismaximum likelihood estimationlaser ranging
NETL
NSTL
万方数据
