In this paper the turbine blade is described by the method of csg and b _ rep mixed . each part of turbine blade has been divided into the meshes with the parameter mapping method . then the process of integrating the sub - block into a whole object is completed with the method of integer coordinate 本文采用csg与b _ rep混合描述法描述汽轮机叶片的结构，利用参数映射法对汽轮机叶片的每个子块进行网格剖分，然后利用整数坐标实现子块网格集合成整体有限元网格模型。
In the framework , a control mesh may be arbitrary one - dimensional or two - dimensional orientated topological manifold , and the curve or surface is defined on differential manifold homeomorphic to the control mesh with a potential function as its basis functions . this method is an extension of nurbs , which efficiently overcomes the limitations of nurbs 广义有理参数曲线曲面定义在与控制网格拓扑同胚的微分流形上，以高度一般的势函数为基函数，其控制网格可以是任意的一维拓扑流形和二维可定向拓扑流形。
Against a prototype which is being produced ， its three dimension end region entity model of stator is established ， and with the aim of simplifying calculation ， the theory of how to simplify entity model is studied ， then the theory is made use of ， and the end region entity model of stator is simplifi - ed ； meshing characteristics of three dimension entity model and shortcomin - gs of end region entity model of stator are studied ， then meshing method of three dimension end region entity model of powerformer stator is studied as well ， and the simplified entity model is meshed with this meshed model ， the distribution of end region magnetic field of stator is analyzed ， and the magnetic field energy and reactance of powerformer end region are calculated and compared with design value because the prototype is being produced ， in this paper ， stator core ， gap and eddy equipment are not taken into consideration ， and this has a little influence on the result ， but through analysis ， the result is proved to be good through the example calculation ， it is known that the method of this paper is useful and through theoretic analysis ， it is proved that end region 针对一台生产中的样机，对其建立了定子端部三维实体模型，而且为了达到简化计算的目的，研究了如何将其简化的理论，并应用这些理论对样机定子端部实体模型进行了简化；研究了三维实体模型的剖分特点和定子端部实体模型存在的缺点，在此基础之上，研究了对简化的powerformer定子端部三维实体模型的剖分方法，并且对简化的实体模型进行了剖分。应用剖分的三维实体模型，用有限元法分析了powerformer定子端部的磁场分布，计算了端部区域的磁场储能，并利用磁场储能计算了powerformer定子端部漏抗，将计算值与设计值进行了比较、分析。由于样机处在设计生产阶段，本文暂时没有考虑定子铁心、气隙和涡流器件对端部磁场的影响，这对分析结果有一定的影响，但是仍然得到较好结果。
A specialized manufacturer of rhombic metallic mesh , kyowa kogyo can cope with orders for all kinds of rhombic metallic mesh materials including wire rod mesh net , etc . in particular , as a rare manufacturer that is capable off producing fine metallic mesh with a mesh size of 10 20mm , our technology is highly evaluated throughout the industry 本公司生产菱形金属丝网，能满足盘条,网眼等所有种类的菱形金属丝网的制作。特别是，作为能生产1020的细网眼金属丝网的少数厂家之一，这项技术也获得了很高的评价。
The packing system consists of the following modules : the input module , the automatic packing module , the output of the packing result module , and the output of the packing datum module etc . on the basis of the above - mentioned packing system , the characters of the gear box is described in the form of " class " , the packing system is then applied to test the example of the gear box ( in the gear box verification , we add a constraint module to deal with the specified problem ) . the gears are simplified to cylinders and the module is formed in autocad . at the end of the paper , we get an optimal value of the packing density and the whole thickness by adding the constraints of gears with the same axes , and constrain the moves of the gears meshed with each other , which are not appeared in the former system and can be selected by the user 在任意三维实体布局系统的基础上，本文对机床主轴箱系统的特征以类的形式进行了描述，将该布局系统应用于机床主轴箱的实例验证当中(在主轴箱实例验证中，又特别增加了布局约束模块) ，通过将齿轮简化为圆柱体，在autocad环境下建立了主轴箱的cad模型，增加了任意实体布局系统中所没有的同轴约束，并对有啮合要求的实体进行变动限制，这种约束和限制是根据用户实时选择有相关要求的齿轮对来实现的，使布局实体在有约束的情况下，达到布局密度和布局总厚度等衡量指标的优化值。
Its properties and design method is discussed in chapter 4 . for control meshes with arbitrary topology , we present a universal method in chapter 5 to construct parametric curves and surfaces . generalized rational parametric surface can be controlled precisely and flexible , and it is easy to model local features and 3d primitives 然后，在第五章中，我们将控制网格进一步推广到任意可定向二维拓扑流形，提出了一个通用的方法将控制网格映射到与之拓扑同胚的微分流形上，统一了广义有理参数曲线曲面的构造过程。
Application : hexagonal wire mesh with its good corrosion resistance and oxidation resistance , serves well as strengthening , protection and temperature keeping materials in the form of mesh container , stone cage , isolation wall , boiler cover or poultry fence in construction , chemical , breeding , garden and food processing industries 用途：用于饲养鸡鸭鹅兔及动物园围栏，机械设备的防护，高速公路护栏，体育场所围网，马路绿化带防护网。该丝网在制作成箱子状的容器后，用乱石等填满网箱，可用于保护和支持海堤山坡路桥水库及其他土木工程,是防洪和抗洪上好材料。
