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结构形状分析
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     This paper detects the boundaries using wavelet transform method, and recognizes the inside and outside boundaries of ICT image of assembly parts based on simple loops, this algorithm can be applied to reconstruct solid model and analyze the shapes of assembly parts.
     用小波变换提取装配体ICT图象中的边界轮廓,提出基于简单环识别装配体ICT图象的内外边界,该算法可用于装配体的结构形状分析并能正确地建立实体模型。
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     In the design of the water-hydrogen cooled 300 MW steam turbine,the two-dimensional finite element analysis of the end magnetic field was applied to optimize the structure and shape of the generator(stator's) end.
     简要介绍了在水氢冷300 MW汽轮发电机的设计中,应用端部电磁场二维有限元分析来优化发电机定子端部结构件的结构形状,分析了铜屏蔽的温升及其通风系统。
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     SHAPE FINDING ANAL YSIS OF CABLE-NET STRUCTURE
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  shape-finding analysis
In the present project, the dynamic relaxation method was employed for shape-finding analysis.
      


This paper deals with a structural shape analysis with the constraint conditions of homologous deformation. The homologous deformation is defined as "the deformation of a structure shall be called homologous if a given geometric relation holds, for a given number of structural points, before, during and after the deformation".In the first part of the paper, all nodal points are divided into three categories: nodal points representing the homologous deformation (degress of freedom = h), the shape change (degress...

This paper deals with a structural shape analysis with the constraint conditions of homologous deformation. The homologous deformation is defined as "the deformation of a structure shall be called homologous if a given geometric relation holds, for a given number of structural points, before, during and after the deformation".In the first part of the paper, all nodal points are divided into three categories: nodal points representing the homologous deformation (degress of freedom = h), the shape change (degress of freedom = f ) and the fixed boundary, respectively. Then, the basic equations with the n×m coefficient matrix are introduced for any truss structures, giving a homologous parameter, where n= h + f and m= 1 + f, in the second part, the existence condition of solution for the derived basic equations is given by the use of the generalized inverse. This condition is a set of nonlinear equations with unknowns of nodal coordinates, and is numerically analyzed by Newton-Raphson method in order to find out the final shape. In the final part, an illustrative example is nummefically analyzed in order to examine the validity of the present method.

本文研究了具有Homologous位移约束的结构形状分析问题。文中第一部分把结点分成三类:表示Homologous变形点(自由度=h),形状可变点(自由度=f)和边界点。然后对于任意的桁架结构给出Homologous参数,n=h+f和m=1+f,引入具有n×m的系数矩阵的基础方程。在第二部分,利用广义逆矩阵导出基础方程的解存在条件。然后建立包含未知结点坐标的非线性方程组,并由Newton-Raphson法进行数值分析,以找出最终形状。最后一部分举了一个三维桁架的例子,以说明该方法的有效性,实用性。

This paper detects the boundaries using wavelet transform method, and recognizes the inside and outside boundaries of ICT image of assembly parts based on simple loops, this algorithm can be applied to reconstruct solid model and analyze the shapes of assembly parts.

用小波变换提取装配体ICT图象中的边界轮廓,提出基于简单环识别装配体ICT图象的内外边界,该算法可用于装配体的结构形状分析并能正确地建立实体模型。

In this paper,a new method for shape a nalysis of geometrically changeabl e structures has been presented.First,the shape analysis problem is changed into a mathematical optimum model.The Gram-Schmit method is use d to reduce the target function value.Then the result shape corresponding to the minimum value is obtained.The nu merical examples show that this method can be used to find the shape of both unstabl e structures and foldable structure s.

本文提出了一个几何可变结构形状分析的新方法。先将结构形状分析归结为一个最优化问题,再用Gram-Schmit法,逐步缩小目标函数值,最终求出结构的平衡位置。文末给出了此法在折叠结构和受力结构中的算例。

 
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