Optical triangulation method was used to measure geometrical dimension parameters by laser displacement sensor scanning . both laser displacement sensor scanning and image processing technology were used to measure failure parameters . the detecting results of parameters of wheel set met the requirements of vehicle maintaining 輪對(duì)尺寸參數(shù)是利用基于激光三角法測(cè)量原理的激光位移傳感器來(lái)檢測(cè),踏面缺陷參數(shù)的測(cè)量是利用激光位移傳感器和圖像處理相結(jié)合的方法來(lái)檢測(cè),其測(cè)量精度達(dá)到車輛段修要求的技術(shù)指標(biāo)。
An original mesh generation method based on the nc track points of tool surfaces is proposed here , the method can automatically generate meshes consisting of only quadrilateral elements , which is desirable for better accuracy and efficiency of simulation . besides , an automatic local coarsening algorithm for structured quadrilateral meshes is also developed . for arbitrary discrete points on auto body surfaces , an automatic triangulation method is adopted and a series of mesh optimization methods with given constraint conditions are proposed 創(chuàng)新地提出了基于模具型腔表面nc數(shù)控軌跡點(diǎn)的全自動(dòng)四邊形網(wǎng)格生成算法,提出了結(jié)構(gòu)化四邊形網(wǎng)格局部自動(dòng)優(yōu)化算法,研究了基于車身曲面離散點(diǎn)的三角形網(wǎng)格自動(dòng)生成算法,并提出了給定約束條件的三角形優(yōu)化算法,探討性地研究了基于模具曲率半徑的板料初始網(wǎng)格局部自動(dòng)細(xì)化算法。
The traditional 3d modeling methods are based on the volumetric elements , and their complexities are proportional to the volume of object , which is not apt to the huge - volume objects . since the result of a volumetric computation consists of disordered 3d points cloud , some triangulation methods which involve computing the distances between randomly scattered points are necessary to obtain the surface mesh of the object 目前的三維重構(gòu)大多是基于體素的重構(gòu),計(jì)算的復(fù)雜程度和物體的體積成正比,不適用于體積龐大的物體,而且計(jì)算后的得到是物體表面的一系列離散的點(diǎn),需要進(jìn)行三角剖分才能夠得到物體表面模型。