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This paper presents an IFMC CAD model that consits of a geometry model and a material model, in which the geometry space acts as a base space and the material space acts as a bundle space. In this CAD model, the geometry model is based on the non-manifold model. In addition, a half-face data sturucture, which is derived from the half-edge data structure with the non-manifold feature of IFMC taken into account, is adopted to represent the geometry and topology information of the component.For the material model of IFMC, this paper focuses on the FGM component representation firstly and present a simplex-subdivision based CAD data exchange format, in which the material information is represented as a (n-1) simplex and material .distributing feature is represented by the interpolation on the simplex-subdivision. Based on those, a part-building orientation optimization algorithm and an adaptive slicing algorithm for FGM component are presented in the paper.For the IFMC material model, the IFMC material information representation is divided into a meso-scale and a macro-scale representation. In the meso-scale, a concept named parameterized periodic functional meso-structure is presented as a unique form to represent the FGM (the homogeneous materials are regarded as a special FGM), the composite and the functional meso-structure material. The model of PMS is a three-tuple that contains the space stateinformatation, the material parameter and the material meso-scale distribution feature. The macro-scale material information representation is similar to the FGM components by interpolation of the control parameter of the periodical functional meso-structure based on the simplex-subdivision.Through an example of manufacturing-oriented IFMC CAD data processing, it is proved that the IFMC CAD model and the material information representation and process method proposed in this paper can provide a reliable data support for IFMC digital concurrent design and manufacturing.
本文将理想材料零件CAD模型建立在以几何空间为底空间、以材料空间为丛空间的结构上,使用非流形几何模型作为理想材料零件几何拓扑模型的基础,并在半边数据结构基础上,针对理想材料零件的非流形特征局限内部边界上的特点,给出了一个半面数据结构来表述零件的几何拓扑信息;对于理想材料零件的材料模型,本文先从功能梯度材料零件的信息表述与CAD数据交换和处理入手,将材料信息表述为(n-1)维单纯形,然后通过对三维几何区域的单纯剖分,以插值的方式表述零件材料分布特征;在此基础上,根据功能梯度材料零件分层制造中对CAD数据处理的要求,给出了综合考虑零件几何特征与材料特征的生长方向优化算法和自适应切片算法;而对于文中所定义的理想材料零件,本文将其材料信息表述分解到细观和宏观两个尺度进行,首先给出了细观尺度上参数化的周期性功能细结构概念,以此来统一表述功能梯度材料(单质材料作为特殊的功能梯度材料看待)、复合材料和功能细结构材料;把周期性功能细结构模型化为一个包含空间状态信息、材料构成参数和材料细观分布特征参数的三元组,以表达零件的细观材料特征;对于零件宏观的材料变化特征,则同样在几何区域单纯剖分的基础上,通过对细观尺度上周期性功能细结构控制参数的插值来完成;通过理想材料零件CAD数据处理的算例,验证了本文中理想材料零件CAD模型及材料信息表述与处理方法完全可以为理想材料零件的数字化制造提供可靠的数据支持。
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The authers examined the efficacy and safety of ASO,a new self_centering septal occluder consisting of two round disks made of Nitinol wire mesh and linked together by a short connecting waist.68 children with secundum ASD met with the criteria for transcatheter closure received this operation through the two_dimensional echocardiograp...
二十多年来相继研制出了多种经导管房间隔缺损封堵装置,但由于这些装置递送鞘大、操纵繁杂、难以回收及装置的支架断裂、易位和栓塞及术后较高的残余分流率等限制了它们的临床应用[1]。1997问世的Amplatzer房间隔封堵器,因其具自膨性、自
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The nuclear force applying similarity's restrains inertial guidance way, the speed regulation carrying out commixture on the ion beam being unlike speed and the energy, develops the able ion allocating the fast direct-current transformer, is that cold nuclear fusion piles up, the nuclear engine and that kind nuclear power station start nuclear fusion and electric energy therefore the corollary equipment transporting systematic importance, combining to apply for a patent.
本发明项目特征是:在常温真空条件下,设置空间特定组合的电磁场,根据轻原子核固有的磁矩和内电场,先将两串待聚变的原子核约束在同一条线段内;再利用原子核固有的自旋动量矩矢量形成近光速自旋的超强力自转陀螺惯性制导特性,来克服库仑强势垒的偏向作用,实现直接对撞核聚变的;应用相似的核力约束惯性制导方式,对不同速度和能量的离子束进行混合调速,研制成的离子调速直流变压器,是冷核聚变堆、核发动机和该类核电站启动核聚变和电能输送系统的重要配套设备,所以合并申请一个专利权。
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In order to improve the accurate of measurement, the artifacts, such as eddy current, thermal convection, background gradient must be considered both experimentally and methodologically.
我们把多自旋回波和双向梯度场技术相结合,用来抑制这些干扰,并在生物样品的自扩散系数测定中的进行了应用。
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Henan Provincial People's Congress on May 22 to vote on the adoption of the "Regulations on the Protection of consumer rights in Henan Province" Ordinance to delete some of the original "Hotel shall not set a minimum consumption, consumers should not refuse to bring their own drinks, beverages , shall not charge corkage fees, room charges unreasonable fees "clause, which means that consumers can bring their own future drinks and beverages, the hotel will be to decide.
河南省人大常委会5月22日表决通过的《河南省消费者权益保护条例》删除了原来条例中有的"饭店不得设定最低消费,不得拒绝消费者自带酒水、饮料,不得收取开瓶费、包间费等不合理的费用"的条款,这意味着,今后消费者能不能自带酒水、饮料,将由饭店来决定。
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In the first session the fans vibration on-line monitoring system is realized with VC language, also compile auto power spectrum density function, cross power spectrum density function, autocorrelation function and cross correlation function etc spectral analysis function to carry through simple offline fault diagnosis.
首先用稳定性强、扩展性好的VC++语言开发了通风机振动在线监测系统,并编写了自功率谱密度函数、互功率谱密度函数、自相关函数和互相关函数等频谱分析函数来进行简单的离线故障诊断。
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Now, I am adding one more custom operation invoker, to process a service operation in declaratively way, in other words, custom operation for invoking a XAML Method.
现在,我多加自定义操作调用程序,来处理声明的方式服务运作,换言之,为调用XAML的方法,自定义操作。
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Similarly, they all provide increment and decrement operators to allow us to go from one element to the next.
类似地,容器都提供自增和自减操作符来支持从一个元素到下一个元素的访问。
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The quality of electrolytic capacitor was judged by self- discharge voltage .
用自放电电压的高低来判定电容器的质量。2 Self-discharge 自放电1。
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The Early Autism Study, led by Mel Rutherford, associate professor of psychology in the Faculty of Science, has been using eye tracker technology that measures eye direction while the babies look at faces, eyes, and bouncing balls on a computer screen.
科学系心理学卢瑟福副教授是早期自闭症研究的领头人,一直以来采用人眼跟踪技术,也就是说当孩子们看电脑屏幕上出现的各种面孔、眼睛和弹起的球时,通过测量他们的视线来判断是否患自闭症。
- 推荐网络例句
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For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether
年美国个人破产法的一个改动使得破产登记急速下降,而后引起了信用卡大规模的亏损。
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Eph. 4:23 And that you be renewed in the spirit of your mind
弗四23 而在你们心思的灵里得以更新
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Lao Qiu is the Chairman of China Qiuyang Translation Group and the head master of the Confucius School. He has committed himself to the research and promotion of the classics of China.
老秋先生为中国秋阳翻译集团的董事长和孔子商学院的院长,致力于国学的研究和推广。