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专业英语(论文)英译汉课 题 名 称 机电专业英语 学 生 姓 名 学 号 10411044 系、年级专业 10级机电一班 指 导 教 师 2013年 12 月 12日Design of StructuralMechanisms结构机制设计Melinda MayA dissertation submitted for the degree of Doctor of Philosophyin the Department of Engineering Science at the University of Oxford St Hughs College牛津大学圣休斯学院工程科学系哲学博士学位论文Trinity Term 20032003年夏季学期Design of Structural Mechanisms结构机制设计Abstract摘要A dissertation submitted for the degree of Doctor of Philosophyin the Department of Engineering Science at the University of Oxford St Hughs College牛津大学圣休斯学院工程科学系哲学博士学位论文Trinity Term 20032003年夏季学期In this dissertation, we explore the possibilities of systematically constructing large structural mechanisms using existing spatial overconstrained linkages with only revolute joints as basic elements. 在这篇论文中，我们探讨利用只以旋转接头为基本元素的现存受空间限制过约束机构来系统地构建大型结构机制的可能性。The first part of the dissertation is devoted to structural mechanisms (networks) based on the Bennett linkage, a well-known spatial 4R linkage.该论文的第一部分专注于以贝内特机构为基础的结构机制（网络），一个众所周知的空间4R机构。This special linkage has been used as the basic element.这种特殊的联动一直被用来作为基本元素。A particular layout of the structures has been identified allowing unlimited extension of the network by repeating elements.一个特定的结构已确定通过重复元素允许的网络的无限延伸。As a result, a family of structural mechanisms has been found which form single-layer structural mechanisms.因此，一个形成单层结构机制的结构机制家庭，已经被建立起来。In general, these structures deploy into profiles of cylindrical surface.一般而言，这些结构被有效利用于圆柱表面的轮廓。Meanwhile, two special cases of the single-layer structures have been extended to form multi-layer structures.同时，单层结构的两种特殊情况已经被扩展到形成多层结构。In addition, according to the mathematical derivation, the problem of connecting two similar Bennett linkages into a mobile structure, which other researchers were unable to solve, has also been solved.另外，根据数学推导，其他研究中没办法解决的将两个相似的贝内特联动机构为一个移动结构的问题解决了。A study into the existence of alternative forms of the Bennett linkage has also been done.一项研究贝内特机构的替代形式的存在也被完成。The condition for the alternative forms to achieve the compact folding and maximum expansion has been derived.另一种形式实现紧凑的重叠和最大膨胀的情况已经出现。This work has resulted in the creation of themost effective deployable element based on the Bennett linkage.这项工作已经导致了基于贝内特机构最有效的可展元素的产物。A simple method to build the Bennett linkage in its alternative form has been introduced and verified.一个在它的替代形式上建立贝内特机构的简单的方法已经被引进并得到了验证。The corresponding networks have been obtained following the similar layout of the original Bennett linkage.相应的网络已经紧随着原始的贝内特机构的相似布局被建立获得。The second effort has been made to construct large overconstrained structural mechanisms using hybrid Bricard linkages as basic elements.第二种努力已经做出，是利用混合六连杆机构作为基本元素俩建立大型过约束结构机制。The hybrid Bricard linkage is a special case of the Bricard linkage, which is overconstrained and with a single degree of mobility.混合六连杆机构是六连杆机构一种特殊的情况，这是过约束和有一个流动性的单自由度。Starting with the derivation of the compatibility condition and the study of its deployment behaviour, it has been found that for some particular twists, the hybrid Bricard linkage can be folded completely into a bundle and deployed to a flat triangular profile.从相容性条件的推导和它的部属的行为研究，人们已经发现，对一些特殊的曲折，混合六连杆机构能够可完全折叠成束并部属到一个平坦的三角形的轮廓。Based on this linkage, a network of hybrid Bricard linkages has been produced. Furthermore, in-depth research into the deployment characteristics, including kinematic bifurcation and the alternative forms of the hybrid Bricard linkage, has alsobeen conducted.基于这种机构，一个混合六连杆机构的网络已经产生了。此外，对部属的特点进行了深入的研究，包括运动分岔和混合六连杆的替代形式，也已经产生了。The final part of the dissertation is a study into tiling techniques in order to develop a systematic approach for determining the layout of mobile assemblies.本篇论文的最后一部分是研究拼接技术，以为移动组建布局的确定发展一个系统的方法。A general approach to constructing large structural mechanisms has been proposed, which ca n be divided into three steps: selection of suitable tilings, construction of overconstrained units and validation of compatibility.一个构建大型结构机制的一般方法已经被提出来了，这方法能够分为三步：选择合适的面砖，建立过约束单元和兼容性的验证。This approach has been successfully applied to the construction of the structural mechanisms based on Bennett linkages and hybrid Bricard linkages.这个方法已经被成功地运用于基于贝内特机构和混合六连杆机构的结构机制的建立。Several possible configurations are discussed including those described previously.几种可能的结构包括前面描述过的那些结构已经被讨论了。All of the novel structural mechanisms presented in this dissertation contain onlyrevolute joints, have a single degree of mobility and are geometricall yoverconstrained.这篇论文里展示的所有新型的结构机制只包括了旋转接头，有一个单一的流动性的程度并且在几何上过约束。Research work reported in this dissertation could lead to substantial advancement in building large spatial deployable structures.本文所报道的研究工作能够引领建设大型空间可展结构中的结构机制。Keywords: Structural mechanism; deployable structure; 3D overconstrained linkage;network; tiling technique; Bennett linkage; hybrid Bricard linkage;alternative form.关键词：结构机制; 展开结构; 3D过约束机构; 网络; 拼接技术；贝内特机构;混合六连杆机构; 替代形式。 PrefaceThe study contained in this dissertation was carried out by the author in the Department of Engineering Science at the University of Oxford during the period from January 2000 to August 2003.其所载本论文研究是由作者在工程科学系在牛津大学在一月2000to2003年8月期间。 First of all, I would like to thank my supervisor, Dr. Zhong You, for his advice,encouragement and support. He introduced me to the subject of deployable structures.The regular discussion with him has been very beneficial to my research.首先，我要感谢我的导师，钟游博士，为他出谋划策，鼓励和支持。他向我介绍了部署结构的主体。他经常讨论一直到我的研究非常有益的。Appreciation also goes to Prof. Sergio Pellegrino and Dr. Simon Guest at the University of Cambridge, Prof. Eddie Baker at the University of New South Wales of Australia, Prof. Tibor Tarnai at the Budapest University of Technology and Economics of Hungary, and Prof. Yunkang Sui at the Beijing Polytechnic University of China. The advice from them has been invaluable and very helpful to my research还要感谢教授塞尔吉奥佩莱格里诺和西蒙游客博士在大学剑桥，埃迪贝克在澳大利亚的新南威尔士大学教授，中蒂博尔Tarnai在科技和经济的布达佩斯大学教授孕康绥在中国的北京理工大学匈牙利和教授。该建议他们是非常宝贵的，非常有利于我的研究。I am also grateful to the Workshop in the Department of Engineering Science, inparticular, Mr. John Hastings, Mr. Graham Haynes, Mr. Kenneth Howson, and Mr.Maurice Keeble-Smith. Without their great patience and skill, my models would never be as impressive as they are.我也很感谢在工程科学系，在车间特别是，约翰黑斯廷斯先生，格雷厄姆海恩斯先生，肯尼斯豪森先生，和先生莫里斯KEEBLE-史密斯。没有他们的极大的耐心和技巧，我的模型绝对不会是令人印象深刻，因为它们。Financial aid from the K. C. Wong Foundation, ORS and Zonta International, andconference grants from St Hughs College, the Department of Engineering Science and the University of Oxford are gratefully acknowledged.从王宽诚基金会，口服补液盐和国际崇她社，andconference从圣休学院，工程科学和牛津大学部补助资金援助深表感谢。Finally, I would like to thank my parents for their confidence in me, and give special thanks to my husband for all his love, patience and encouragement.最后，我要感谢我的父母，他们对我的信任，并给予特殊感谢我的丈夫对他所有的爱，耐心和鼓励。Except for commonly understood and accepted ideas, or where specific reference is made to the work of others, the contents of this report are entirely my original work and do not include any work carried out in collaboration. The contents of this dissertation have not been previously submitted, in part or in whole, to any university or institution for any degree, diploma, or other qualification.除了普遍理解和接受的观念，或具体提到了其他人的工作，本报告书的内容完全是我的原创作品，不包括在合作开展任何工作。本论文的内容没有被先前提交的部分或全部，以任何一所大学或机构的任何学位，文凭或其他资格。This dissertation consists of six chapters.本文共分六章。Chapter 2 presents a brief review of existing work related to our task, including the definitions and analysis methods for overconstrained linkages, the existing 3Doverconstrained linkages, as well as the mathematical tiling technique. 第2章介绍了现有工作的简要回顾有关我们的任务，包括定义和过约束的联系，现有的三维分析方法过约束的联系，以及数学拼接技术。 The reason for including tiling in this review is because it is used later in producing a suitablearrangement of basic linkages in order to build structural mechanisms.这样做的原因包括平铺在本次审查是因为它是在生产的适当使用后基本的联系，以建立结构机制安排。Chapter 3 focuses on the construction of structural mechanisms using the Bennett linkage. First of all, a method to form a network of Bennett linkages is presented. 第3章着重于使用本内特结构机制建设联动。首先，一种方法，形成贝内特联系的网络呈现。This is followed by the mathematical derivation of the compact folding and maximum expanding conditions, which leads to the discovery of an alternative form of the Bennett linkage.这其次是紧凑的折叠和最大的数学推导扩大的条件，这导致的贝内特的另一种形式的发现联动。 The alternative is then extended to networks of Bennett linkages, leading to large structural mechanisms which can be compactly folded up. This chapter is ended with further discussion and conclusions.另一种选择是，然后扩展到班尼特的联系网络，导致大型结构的机制，可以紧凑地折叠起来。本章结束进一步的讨论和结论。Chapter 4 is devoted to the design of structural mechanisms using the hybrid Bricard linkage.第4章是使用混合Bricard专门的结构机制的设计联动。首先，6R混合联动建设过程的基础上，Bricard连杆，它的基本特征进行了描述。 Firstly, the construction process of a 6R hybrid linkage based on the Bricard linkage and its basic characteristics are described. Secondly, the deployment features and the possibilities to form networks of hybrid Bricard linkage are presented. 其次，部署功能并且，形成的杂种Bricard联动网络的可能性给出。第三，这种联系的分岔研究。Thirdly, the bifurcation of this linkage is studied. Furthermore alternative forms of the hybrid Bricard linkage are discussed. Finally an in-depth discussion ends this chapter.混合的另外的替代形式Bricard联动进行了讨论。最后一个深入的讨论结束本章。Chapter 5 deals with the mathematical tiling technique and its application in theconstruction of structural mechanisms. The networks of Bennett linkages and hybridBricard linkages are revisited according to the tiling technique. 第 5 章处理数学的盖瓦技术和它的申请在这结构机制的工程。班尼特连合和混血儿的网络Bricard 连合依照盖瓦技术被再访。The main achievements of the research are summarised in C
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