基于平面运动链的类型综合及创新设计方法的研究

发布时间：2018-10-17 13:42

【摘要】：机构学研究的核心是进行机构创新设计。机构创新设计的实质是通过不同的类型综合和同构判别方法，产生不同的运动链，然后依托某种创新设计方法，构造出不同的具有优良品质和独特性能的结构类型。近年来，在运动链类型综合、同构判别以及创新设计方法上，已经取得了较大的成果。然而大多数方法的繁琐性、低效性和不实用等局限制约了机构创新设计的发展，因此，寻求简单、高效和实用的类型综合、同构判别和创新设计方法，成为了机构学研究的热点和难点。本文以平面多杆机构为研究对象，在平面运动链的类型综合、同构判别和机构创新设计的方法上开展了研究。主要研究内容和结果如下：归纳了众多平面运动链类型综合的一般步骤，在此基础上，通过将胚图支链法、胚图插点法和运动链基本链型构造法有机的组合（称为系统化类型综合），完整的综合出了8杆以下-1到7自由度的所有单铰运动链型，并对含复铰的运动链类型综合进行了演化创新。通过若干同构运动链的实例，对基于特征数组的同构判别方法进行了详细阐述和创新，使其不仅满足单铰运动链的同构判别，，还适用于复铰运动链的同构判别，并编制了基于特征数组的同构运动链判别软件，实现了该方法的计算机化。利用机构创新设计中的机构再生运动链理论，对一种可变性沙发床机构，进行了创新设计，在此基础上，指出了该方法的一些局限性，加入了杆件重组、增减杆、拓扑特性评价和同性异形演化等步骤进行了补充和简化，从而丰富了再生运动链理论，使其更简单完善，最后应用一种玻璃模具的开合机构，对完善后的创新设计方法进行了实例的验证。通过对剑杆织机共轭凸轮引纬机构的分析，应用上述的机构创新设计方法进行了创新设计，提出了几套可行的方案，并对其中一个方案进行了运动学分析、建模和仿真，证实了该方法进行创新设计具有简单、高效的优势。
[Abstract]:The core of mechanism research is the innovative design of mechanism. The essence of mechanism innovation design is to produce different kinematic chains through different types synthesis and isomorphism discrimination methods, and then to construct different structural types with excellent quality and unique performance depending on some innovative design method. In recent years, great achievements have been made in kinematic chain type synthesis, isomorphism discrimination and innovative design methods. However, the limitations of most methods, such as triviality, inefficiency and impracticality, restrict the development of mechanism innovation design. Therefore, we seek a simple, efficient and practical method for type synthesis, isomorphism discrimination and innovative design. It has become a hot and difficult point in mechanism research. In this paper, the method of type synthesis, isomorphism discrimination and innovative design of planar kinematic chain is studied. The main contents and results are as follows: the general steps of synthesis of many planar kinematic chains are summarized. An organic combination of the embryo map insertion method and the basic chain construction method of the kinematic chain (known as systematic type synthesis), the complete synthesis of all single-hinged kinematic chains with degrees of freedom from-1 to 7 degrees of freedom below 8 rods, The evolutionary innovation of the type synthesis of motion chain with complex hinges is also carried out. Through some examples of isomorphic kinematic chain, the method of isomorphism discrimination based on feature array is expounded and innovated in detail, which not only satisfies the isomorphism discrimination of single hinge kinematic chain, but also applies to the isomorphism discrimination of complex hinge kinematic chain. A discriminant software of isomorphic kinematic chain based on feature array is developed, and the computerization of this method is realized. Based on the theory of mechanism regenerative kinematic chain in mechanism innovation design, an innovative design of a kind of variable sofa bed mechanism is carried out. On the basis of this, some limitations of this method are pointed out, and the bar recombination is added, and the bar is added and decreased. The evaluation of topological characteristics and the evolution of homotropic shapes are supplemented and simplified, which enriches the theory of regenerative motion chain and makes it more simple and perfect. Finally, a kind of opening and closing mechanism of glass mould is used. The improved innovative design method is verified by an example. Based on the analysis of conjugate cam weft insertion mechanism of rapier loom, the innovative design method mentioned above is applied, and several feasible schemes are put forward, one of which is kinematically analyzed, modeled and simulated. It is proved that this method has the advantages of simplicity and high efficiency.
【学位授予单位】：浙江理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH112

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