查询词典 cylindrical shell

With the Hamilton canonical equation of cylindrical shells, the coupling equation of an elastically constrained circular cylindrical double-shell system is derived.

以圆柱壳的Hamilton正则方程为基础，推导了受弹性约束的双层圆柱壳的耦合方程，并将其应用于大型发电机定子系统的振动特性分析。

In general, the deformation pattern of ellipse shaped shell in dieless spinning is similar to that of a rotary one. Therefore, it is possible to spin a deep elliptic cylindrical shell if a cylindroid mandrel is adopted.

从总体上看，椭圆形锥壳零件的无芯模旋压和回转形锥壳无芯模旋压的变形规律相类似，由此可以推测，利用椭圆柱形芯模实现椭圆形深筒零件的旋压也是可能的。

The far field sound pressure levels of the cylindrical shell and spherical shell excited by an exterior point load are measured, and a good agreement between the theoretical results and the test results shows that the theoretical method and corresponding results in this dissertation are correct.

主要研究内容：(1)建立了考虑流固耦合作用并在流体流动条件下部分充液或者部分浸没圆柱壳体运动方程，应用波数域法和传递矩阵法得到了该类壳体振动响应的径向波数域速度，进而应用平稳相位法得到了该类壳体辐射声场的预估理论模型。

Sharp relief the outline by the polished oak or walnut made of ebony in the late decorative panels, like the Imperial Palace has the chair back, straight handrails, and has spin into spherical, cylindrical spiral or railings of the legs, with bun-shaped or Dutch whirlpool foot ornaments, the use of painted wood inlay works fine, hawksbill shell, gold-plated metal, mother-of-pearl, ivory, furniture component parts produced by Spain Cordoba leather, velvet, needlework lace, brocade and tassels and other decorative ornaments, decorative patterns has olive branches, laurel leaves, leaf foil labeled as the vortex, the Arab-style patterns, roses decorated, whirlpool floriation, round carving, shell, monster.

夏普救援抛光橡木或乌木在后期装饰板核桃皇宫一样，大纲有椅子，直扶手，并已成为球形，圆柱形螺旋或腿栏杆的馒头，形或自旋荷兰漩涡脚饰，木材的镶嵌画使用工作正常，玳瑁壳，镀金金属，母珍珠，象牙，家具零件，西班牙科尔多瓦皮革，天鹅绒生产的零部件，刺绣花边，锦缎和流苏等装饰饰品，装饰图案的橄榄枝，月桂叶，叶箔作为涡，阿拉伯风格的图案，玫瑰花饰，漩涡花饰，圆雕刻，贝壳，怪物的标签。

The structures of cylindrical shell and spherical shell are basic components and widely used in industrial fields.

圆柱壳、球壳结构是工程领域中普遍应用的基本构件，研究该类壳体结构流固耦合辐射声场，对国防武器装备隐身技术的进步、工程结构的噪声控制及现代机电产品的低噪声优化设计等都具有重要的理论价值和现实意义。

The methods of discretization is used in the vertical direction to the silo structure ,thus establish cylindrical shell unit, cone shell unit , plate unit , foundation unit, and its semi-analytic displacement function A compute program compiled is used to calculate the static displacement and free vibratioa

本文对筒仓结构进行整体离散，构造了各种单元半解析的位移函数，建立环壳单元、锥壳单元、板单元、地基单元。并编制了程序，计算了各结线的静位移及其自由振动的频率和振型。

We can lead out the equivalent border integral equation by Green the second equation,dividing the inner border in the liquid into a series strip of awls shell or cylindrical shell ,and solve border integral equation along different segment of border, then lead out border integral equation.

由Green第二恒等式导出等价的边界积分方程，将液体内边界分成一系列锥壳或柱壳状条，对边界积分方程进行分段积分，导出边界元格式方程。

The affecting factors of ammonification on natural lignin materials, which include shell of sunflower seed, shell of walnut seed and shell of apricot seed, were studied.

研究了天然木质素瓜子壳、核桃壳、杏核壳三种原料化学加氨的影响因素。

Research on techniques for the synthesis of ACR impact modifier with core-shell structure;2. Preparation of polymer-tungsten-silica composite microspheres with multi-layer core-shell structures;3. Organosilicon-acrylate micro emulsion with core-shell structure was synthesized with OP-10,JFC and amyl alcohol nonionic compounded emulsifier by means of seeded emulsion polymerization.

运用种子乳液聚合工艺以OP-10/JFC/戊醇非离子复合乳化剂合成了具有核-壳结构的有机硅-丙烯酸酯微乳液，研究了复合乳化剂类型、丙烯酸酯单体、有机硅单体加入方式和含量、pH值、硫醇对微乳液聚合过程中稳定性和光泽度的影响，通过差示扫描量热仪和透射电镜对微乳液的结构进行了表征。

The basic approach of protecting people from being hurt or killed in an accident is to improve crashworthiness of vehicles. This paper starts with discussing theories and methods for vehicle passive safety design, which included experiential methods, analytic methods, multi-body dynamics methods, crash test methods and the finite element method. Emphasis will be paid to the basic FEM theories and algorithms of impact problems. Topics discussed include the governing equation, element discretization, hourglass control, time integration, material model, shell element algorithms and contact-impact algorithms. For more reliable simulation results, this paper then conducts study on how to accurately get material model parameters by combining the FEM method with experimental method, and develops relevant material test machine and parameter calculating software. Based on that, basic typical impact simulation and test validation study are conducted. On the basis of the above work, the paper studies the thin-shell structures'crashworthiness, which was affected by the following factors: spot-weld features, shell thickness, cross-section and pre-deformation. As to vehicle parts'crashworthiness, the paper conducts simulation study of designing energy-absorbing steering system and adaptive airbag system. A practical energy-absorbing steering wheel is designed as an example. In further depth research, the paper suggests several inverse quantificational methods for vehicle crashworthiness design based on the ideal crash characteristics. The above theories and methods are applied with good results through several practical vehicles' crashworthiness design and improvement.

文中对汽车碰撞安全性的设计理论和方法进行了归类和总结，其中包括经验法、解析法、多刚体动力学法、试验法以及有限元方法等；重点介绍了碰撞有限元法的基本理论和有关算法，涉及到有限元求解控制方程、单元离散、沙漏模态控制、时间积分、材料模型和应力修正、薄壳单元算法以及接触碰撞界面算法等，探讨了有限元计算中的材料模型参数获取技术，开发了相应的材料试验装置及材料模型参数反求软件，在此基础上进行了基本的碰撞仿真算例和试验对比研究；文中通过应用有限元方法研究了薄壁构件的碰撞吸能特性，指出了设计薄壁吸能构件时需要考虑的几个主要影响因素，即焊点、壁厚、横截面和预变形等；在关于车辆部件的碰撞安全性能设计中进行了吸能转向机构和自适应安全气囊的仿真研究，提出了吸能转向机构和自适应安全气囊的仿真研究方法；文中最后探讨了整车碰撞性能的设计与改进方法，提出了以理想碰撞特性为目标，采用分段加速度或者根据碰撞时间进行设计的反推设计法、部件吸能仿真优化设计法等量化设计方法，并通过综合应用文中所讨论的相关技术进行了整车碰撞性能的设计与改进实例研究，所选定的车型是大众化的普通轿车和碰撞安全性基础较差的微型面包车，研究结果表明，本文所提出的设计与改进方法是适用而有效的，具有重要的工程实用意义和价值。

Finally it offers the analysis of the fault-tolerance system as well as its test verification.

这样，运行于空间环境中的系统的设计目标就是在保证系统实时性

However, it is still difficult to find out the real reason of the increase of the keratinized gingiva during the orthodontic extrusion whether it is due to the proliferation of the gingival tissue or to its elastic nature, that is because the proliferation of the fibroblasts as well as the connective tissue changes in volume and the intra-fibers spaces were all immeasurable in most of the studies.

然而，仍然难以找到真正的原因增加的角化牙龈在正畸挤压它是否是由于扩散的牙龈组织或其弹性性质，这是因为增殖的成纤维细胞以及作为结缔组织的变化量和内部纤维空格都是不可估量的，大多数的研究。