精度 precision; accuracy; degree of accuracy; precision accuracy; trueness 高精度 high precision; 精度表 accuracy table; 精度等级 accuracy class; class of accuracy; grade of accuracy; grade of precision; precision class; 精度准则 accuracy criteria
形状 form; appearance; shape; fashion; likeness 保持它的形状 keep [hold; retain] its shape; 所有圆的形状都是相同的。 all circles have the same shape. 汽车的形状已有很多改进。 there have been many improvements in the form of cars
Using these modifying methods , the re cad model of parts can meet the assembly and accord with the part drawings or ( and ) physical model in both of dimension and shape 使用这些cad模型修正技术,可以保证以re技术建立的零件cad模型完全满足装配要求,并且保证零件cad模型符合零件图样与(或)物理模型的尺寸和形状精度要求。
This results in enormous and redundant data . two adaptive subdivision schemes , which can satisfy engineering requirements , are proposed in this thesis . one is based on shape precision control , another on surface fairness criterion 本文提出了两种符合要求的自适应细分模式:一是基于形状精度控制的自适应细分模式;二是基于表面光顺性要求的自适应细分模式。
A mathematical model in the grinding technology of explosion - proof surface is worked out to find out vibration characteristics , amplitude and phase , and educe the relation curve between shape error and technical parameter 进而讨论箱体零件加工工艺过程误差转换模型、形状精度特征、传递图、描述方程、误差转换结构图;提出防爆面磨削工艺系统的数学模型;求解出振动特性、幅值和相位,得出了形状误差与工艺参数的关系曲线。
The research results include the follows : present some rules for selecting measuring method according to the characteristics of product , study some problems in data preprocessing such as noise removing , probe radius compensation , edge data extracting , sun - regions merging , and local data mending or re - sampling etc . to ensure the part cad models being built and assembled accurately at dimension and shape in re modeling application , three kinds of model modifying techniques are presented such as model - based modifying , drawing - based modifying and physical model - based modifying 这些问题包括:根据产品表面形状及建模方法,提出了一些选择测量方法的原则;研究了消除测量数据噪声信号、 cmm测头半径补偿、测量数据边界处理、测量数据块拼合、数据补缺与补测等测量数据预处理问题。为了解决复杂外形产品re建模经常遇到的零件cad模型配合问题与尺寸精度、形状精度问题,作者研究了基于cad模型的修正、基于零件图样的修正、基于物理模型的修正等三种模型修正技术。