| 1. | The design of valve cam is mainly to design cam profile curve and is carried out in " dynamics correction method " in this paper
配气凸轮的设计主要就是设计凸轮廓形，本文选用“动力学修正法”进行设计。 |
| 2. | The paper ' s design mainly includes two parts . fist part is the tappet displacement curve ' s design , and many dynamics calculation has to be done based on the dynamic design . second part is to design cam profile curve
本文的设计主要包括两大部分，第一部分为挺柱升程曲线的设计，按照动态设计要进行大量的动力学计算，第二部分是凸轮轮廓曲线的设计。 |
| 3. | This measuring system applies linear laser . the laser bean is projected onto the surface of the wheel profile . the laser light plane and the wheel profile intersect to form a profile curve , which shows the shape of wheel trackside
本课题研制的测量系统采用线激光投射到车轮踏面轮廓上，通过左、右ccd摄像机系统的拍摄和图象采集得到车轮轮廓的激光曲线图。 |
| 4. | In the last part of the article applications of space cubic ph to sweep surface modeling and pipe surface modeling are introduced , and sufficient criteria that guarantee that the offset of a sweeping surface are generated by the offset curves of the profile curve is investigated
最后，本文介绍了空间三次ph曲线在扫曲面和管道面造型方面的应用，并研究了一扫曲面的等距面为该扫曲面轮廓线的等距线所生成的充分条件。 |
| 5. | In this thesis , the key technologies of turbine blade modeling cad system are studied based on the deep analysis of the turbine blade modeling . the following are listed works done on this topic : a joining method is given to create the smooth section profile curves of turbine blade
本文以航空发动机涡轮叶片为研究对象，重点研究了涡轮叶片造型cad系统的关键技术，完成了如下工作：本文研究了涡轮叶片的外型造型方法。 |
| 6. | We presented a novel method of searching for similar fragments of 3d curves , with this method , a hash vector is associated with each fixed - length fragments of 3d sherd . each vector consists of low frequence component of fourier - like spectrum for the distance between profile curve and the centroid
讨论了基于hash矢量和fourier变换的轮廓曲线匹配方法，在匹配中不要求一段轮廓线与另外一段轮廓线完全匹配，而是把它们分成很多子段，再用这些子段来进行匹配。 |
| 7. | Profile curves of a rounding surface are calculated along a feature line with a given radius . then inner elements of a rounding mesh is created with these profile curves , and sewn with the original mesh which is pre - trimmed . a feature - based mesh modification method is proposed for existing rounding feature
给定圆角半径,计算出沿特征线圆角曲面的截面轮廓线,以轮廓线的六等分点为节点生成圆角区域单元,并与剪裁后的基网格面缝合,从而生成沿特征线的圆角曲面网格。 |
| 8. | This paper aims at the shortages , which are too much information , too long - processing time , low precision , needing checking and revising , of stl form file in the front processing of laser rapid prototyping , it puts forward a method of 3 - d cad model direct slicing , and it will process section profile curve that direct slicing produces so that this section profile curve will be used in sequent numerical controlling machine tool . direct slicing on the model can reduce data - processing time and file dimension , advance precision of work pieces
本文针对快速成形前处理过程中使用的stl ( stereolithography )格式文件的信息冗余量大，数据处理时间长，精度差，需要检查和修改等缺点，提出了对三维cad模型直接切片的方法，并对直接切片获得的截面轮廓线进行了处理使之能够被后续的工控机所使用，通过对模型的直接切片，能减少数据处理时间，降低文件规模，提高工件精度。 |
| 9. | By means of curvature estimation of vertices , arc identification and arc grouping , a set of profile curves are computed to describe a rounding feature . meanwhile , a rounding mesh is extracted from the mesh model . ( 2 ) approaches of feature - based local modification on shell meshes are studied
提出了一种等半径及变半径圆角过渡特征的提取算法,采用二次曲面拟合估算出网格顶点的主曲率,根据网格过渡区域的曲率特性,计算出一系列截面轮廓线来描述圆角过渡特征,同时将过渡区域数据从模型中分离。 |
