曲面

To satisfy the peoples demand for the special shoes of themselves and solve this contradiction, on the basis of Reverse Engineering, a method to design the shoe-tree, which based on feature and restriction, is proposed. The content of this paper places emphasis on constructing the feature-based model of foot, predigesting the data of feet, reconstructing the new model of the special feet and developing the prototype system.

针对人们对个性化鞋的需求，本文在逆向工程的基础上，在鞋楦的设计过程中首次提出了一种基于特征和约束的新思路来进行脚模的制取，并侧重于脚模特征模型的建立、脚型数据的简化和脚模曲面的重建等内容的研究，开发了用于重建脚模曲面的原型系统。

Model design method is based on NURBS theories. The relative formulas are ratiocinated, and some algorisms, which can be used in programming, are gotten.

采用以NURBS曲面为基础的模型构建方法，对曲线、曲面拟合的相关公式进行了理论推导，并据此得到可以具体用于编程实现的算法。

A parametric surface was reconstructed at a local area of each sample point, and a believing neighbor area was generated based on a given error. A new parametric surface was recomputed, and a larger believing area was generated. The surfel with largest believing area was reconstructed, and the original model was approximated by the surfel in an as large as possible local area.

该算法在每个采样点附近重建一个函数曲面，根据给定误差得到置信邻域，重新计算函数曲面，得到更大的置信邻域，如此反复迭代，产生一个具有最大置信邻域，并在更大范围内逼近原模型的面元。

Usually, the experimental model is the basis of design of the curved objects and their dies. Auto measurement planing and constructing descriptive model with scatted 3D data for complex sculptured surface is a hot research subject in current.

本文在系统研究离散数据曲面造型方法的基础上，着重对具有复杂曲面外形零部件的测量、造型和数控加工中的若干关键技术问题进行了研究。

In order to get a good effect,the transition curved surface is spliced with several arc surfaces.

对过渡曲面采用了圆弧曲面相拼接的方法来拟合，以减少失真。

The triangulating algorithm for discrete surface is presented.

在空间离散点曲面的三角划分方面，提出了限定相邻三角片的法线夹角的空间离散点曲面三角网格划分方法。

It is the 2nd problem of conjugate surface that solve the bearing contact of gear and the gear ratio relation under given position with two known surfaces.

已知两曲面，在既定的位置条件下，求传动的接触域及速比关系属于共轭曲面的第二类问题，也是该领域的难点问题之一，用传统的方法解决起来非常复杂。

Its implementation processes include:①to perform wavelet transform and frequency decomposition and reconstruction to gain the seismic data with high quality;②to adopt least square method to approach and fit the local secondary curved face, and compute the fit coefficients of the secondary curved face, then use these coefficients to gridding mapping bed plane to compute the average curvature and Gauss curvature, then, obtain other curvatures through the various linear combinations of the two curvatures above;③to generalize the curvature of the bed layer to compute and reconstruct the curvature volume.

其实现过程为：①对地震资料进行小波变换、分频重构，获得高质量的地震资料；②采用最小二乘法一次逼近，对局部二次曲面进行拟合，求取二次曲面拟合系数，并利用这些系数对网格化成图层面计算平均曲率和高斯曲率，再从两个曲率的不同线性组合，获取其他曲率；③将层面曲率推广，计算和重构曲率数据体。

The pattern of the tyre of agricultural vehicles has to fit in with the inclement working situations of the vehicles,which brings some difficulty to the pattern block mold design of the tyre.

文章介绍了农用轮胎的特点和轮胎模具的生产流程，然后结合轮胎花纹块的铸造、抛光、机械加工等工艺要求，阐述了农用轮胎花纹块模具设计方法并导出计算公式，内容包括：径向断面的工艺尺寸设计、轴向与周向的展开与弯曲设计；提出采用Coons曲面构造出模具内腔壁曲面的方法。

According to that, the analyses are made on the internal force, the pulling force, the bending moment and twisting moment which make the chip break.

开发出由凹曲面、凸曲面和曲线刃组成的新型复杂三维断屑槽型，可满足小背吃刀量和小进给量的精加工要求。

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。