曲面

Reverse engineering ; CAD ; triangular Bézier surface ; surface reconstruct

反求工程； CAD ；三角Bézier曲面；曲面重构

Due to the irregular distribution of space mesh data, the contour of surface cannot be gained from coordinate of points directly. So a method to detect edges of triangular mesh surface is brought out in this passage.

由于空间网格数据分布不规则，不能从点的坐标直接得到曲面的边界，因此提出了一种空间三角网格曲面的边界提取方法，通过判断一个点的邻接点是否都能通过三角网格的边组成闭合曲线来获取边界点。

The method presented in this paper can not only be applied to the automatic forming inspection, but provide directions for the reworking of unformed plate.

本文研究的检测方法，不仅能够对曲面钢板的成型情况进行自动检测，而且能够为未成型钢板的修正提供具体可靠的指导，是实现整个大型曲面钢板加工过程自动化的重要组成部分。

By using contour plot method with Matlab s high performance on data processing and 3D graphics drawing to draw the universal characteristic curve of the GM-L65 diesel,provide a powerful backing for the integrated powertrain control and shift schedule s design.

根据总功率试验数据，采用曲面拟合的方法，利用MATLAB软件的数据处理和三维曲面功能，求出了GM-L65柴油机的万有特性，为动力传动系统的一体化控制以及换挡规律设计提供了依据。

The influence of curvature distribution value on the tool path length and maximum...

因此，曲面曲率分布特征值可用于评价和预测复杂自由曲面的数控铣削性能。

As for the case n = 3; we also characterize the totallyumbilical spheres and the Veronese surface by a pinching condition for the case n≧4: Analogous to the case n = 3; we then introduce a conformal invariant quantity, and

我们同样考虑n维单位球面中的威尔摩曲面，并藉著某些夹挤的条件对全脐球面与Veronese曲面进行分类。

The pressure on vegetation front surface is larger than that on back surface. And the pressure difference decreases with the lying of vegetation, while viscous force increases.

作用在植被叶片迎水曲面上的压力都大于背水曲面上的压力，且其压力差随着植被俯卧程度的增大是依次减小，而切应力依次增大。

For this purpose, a new approach for computing feature points and analyzing shape features of section contours was developed. It dealt with the sharp changes between the adjacent sections via the transition loop and accessional region.

同时，针对曲面片的分段识别，提出了基于顶点法向距离符号量的判断准则及计算方法，利用表面顶点处的切平面与其周围邻域内的顶点之间的位置关系来判断凸凹性，完成对于具有单一凸凹性质的曲面区域内的三角形面片的聚类划分。

In the second chapter, we present the traditional way of surface fitting ------LeastSquares. We present a kind of amendatory algorithm------Moving Least Squaresbased on Least Squares.

第二章介绍曲面拟合的传统方法——最小二乘法的理论，在此基础上，采用了一种改进的曲面拟合方法——移动最小二乘法。

On the basis of study on two projects:"10-DOF ultrasonic detection system for complex surfaces part" and "Ultrasonic water-logging automatic survey system for rods", this thesis studies the technologies of ultrasonic measurement, kinematic and dynamic modeling of 10-DOF ultrasonic system, real-time sensitivity auto-adjusting, integrated technology of ultrasonic measurement, surface construction and ultrasonic detection for complex surface parts and rods, thus improving the accuracy and efficiency of ultrasonic detection for parts of complex surfaces. Meanwhile, an auto-detection system for metal rods with rough surfaces and bad columniform accuracy is presented for the first time.

本文结合&10自由度复杂曲面超声检测系统&和&棒材水浸超声自动检测系统&两个项目的研究，主要开展了超声测量、检测机器人运动学和动力学建模、误差补偿、灵敏度自动补偿和曲面构件超声检测一体化技术和轴棒类构件超声检测一体化技术的研究工作，进一步提高了复杂型面构件超声检测的效率和精度，并首次针对表面粗糙、圆柱度较差的金属轴棒类构件开发出了高效率的自动化检测设备。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。