基于激光点云的固体火箭发动机热防护层厚度的测量方法  

Measurement method of thermal protection layer thickness of solid rocket motor based on laser point cloud

作　　者：任立衡 金永[1] 王召巴[1] 陈友兴[1] 范晨 REN Liheng;JING Yong;WANG Zhaoba;CHEN Youxing;FAN Chen(School of Information and Communication Engineering,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学信息与通信工程学院,太原030051

出　　处：《固体火箭技术》2021年第1期112-117,共6页Journal of Solid Rocket Technology

基　　金：山西省自然科学基金(201901D111155);山西省应用基础研究项目(201801D121160)。

摘　　要：为实现固体发动机热防护层厚度的精确测量,提出了一种基于激光扫描的热防护层厚度检测方法。首先通过点激光传感器采集到有无热防护层固体火箭发动机内型面的位移值,利用坐标转换法将采集到的位移值转换成为能够表征待测型面的三维点云数据,然后采用基于K-D Tree的精简法对点云数据进行精简。最后利用轴线上一点以及其方向向量估计回转轴确定点云数据的投影面,提取投影后点云数据的几何信息,得到了一系列距离差值,即热防护层的厚度。结果表明,该方法计算获得的值和实测值之间的差异小于2%,可实现对固体火箭发动机热防护层厚度的非接触式测量。In order to measure the thickness of thermal protection layer of solid rocket motor accurately,a thermal protection layer thickness detection method based on laser scanning was proposed.First by point laser sensor collected before and after the thermal protection layer coated in solid rocket motor type surface displacement values,coordinate transformation method was used to convert displacement value of the collected becomes the type under test to the three-dimensional point cloud data,and then based on K-D Tree reduction method to simplify the point cloud data.Finally,a point on the axis and the direction vector were used to estimate rotation axis to determine the plane of the point cloud data,geometry information extraction after projection point cloud data,get a series of distance difference,that is,the thickness of the thermal protection layer.The results show that the relative error of this method is less than 2%,and it can realize the non-contact measurement of the thermal protection layer thickness of solid rocket motor.

关 键 词：固体火箭发动机 热防护层 厚度检测 激光扫描 点云数据处理 

分 类 号：V435[航空宇航科学与技术—航空宇航推进理论与工程] P225.2[天文地球—大地测量学与测量工程]