约束变胞机构等效阻力梯度分析方法

发布时间：2018-07-27 09:47

【摘要】：变胞机构是机构学研究的一个新的领域,它的提出给机构学带来了新鲜空气。通过约束实现变胞全过程的实用变胞机构,要求对应工作构态中的变胞运动副提供相应的约束,实现机构在工作过程中构型的转换、保持和运动时序要求。我们有必要对面向变胞全过程中变胞运动副的阻力之间的关系进行研究,设计实用的变胞机构,本文的主要研究内容包括：首先,介绍约束变胞运动副的约束形式主要包括：几何约束,阻力约束、组合约束；对约束变胞运动副进行分类,根据约束形式分为几何约束变胞运动副、阻力约束变胞运动副和组合约束变胞运动副；设计典型移动和转动变胞运动副的结构,描绘不同类型变胞运动副的阻力特性。在此基础上介绍典型的空间变胞副,并且描绘它的阻力特性。其次,分析约束变胞机构的变胞全过程,用运动循环图表示构态变换中约束变胞运动副的切换过程,分析变胞运动副在构态变换过程中是如何等效的,建立等效阻力梯度模型和调控机理,用等效阻力梯度曲线描述构态变换过程中变胞运动副的等效过程。最后,分析基于扩展Assur杆组变胞机构的组成原理,提出一种变胞机构分析方法,在构态保持过程中将扩展Assur杆组等效成Assur杆组,对机构进行动力学和运动学分析。引用Assur杆组的动态静力分析,提出一种面向变胞全过程的变胞运动副约束力的分析方法,用vc++6.0调用基本杆组程序对面向变胞全过程的变胞运动副进行设计。根据等效阻力梯度模型和面向变胞全过程的变胞运动副的设计原理,设计物料运送机构,设计约束变胞运动副之间的阻力特性,建立三维模型进行运动学仿真,验证约束变胞运动副之间等效阻力梯度关系,验证方法的可行性。
[Abstract]:Metamorphic mechanism is a new field of mechanism research, which brings fresh air to mechanism. The practical metamorphic mechanism in the whole process of metamorphosis is realized by constraints. It is required to provide the corresponding constraints for the metamorphic motion pair in the working structure, and to realize the configuration transformation, retention and motion timing requirements of the mechanism during the working process. It is necessary for us to study the relationship between resistance of metamorphic pairs in the whole process of metamorphosis and to design practical metamorphic mechanism. The main contents of this paper are as follows: first of all, This paper introduces the constraint forms of constrained metamorphic pairs, which include: geometric constraints, resistance constraints, combination constraints, classification of constrained metamorphic pairs, which are divided into geometric constraint pairs of metamorphic motion pairs according to the form of constraints. Drag constrained metamorphic pair and combinatorial constrained pair of metamorphic motion pairs are designed to describe the resistance characteristics of different types of metamorphic pairs. On this basis, the typical space variant pair is introduced, and its resistance characteristics are described. Secondly, the whole process of metamorphosis of constrained metamorphic mechanism is analyzed, and the switching process of constrained pair of metamorphic motion pairs in structural transformation is represented by motion cycle graph, and how the pair of metamorphic motion pairs is equivalent in the process of structural transformation is analyzed. The equivalent resistance gradient model and control mechanism are established. The equivalent resistance gradient curve is used to describe the equivalent process of the metamorphic pair in the process of structural transformation. Finally, based on the analysis of the principle of the metamorphic mechanism of the extended Assur rod group, a metamorphic mechanism analysis method is proposed, in which the extended Assur bar group is equivalent to the Assur bar group in the process of structural state preservation, and the dynamics and kinematics of the mechanism are analyzed. Based on the dynamic static analysis of Assur bar group, a method of analyzing metamorphic motion pair for the whole process of metamorphic cell is put forward. The design of metamorphic motion pair oriented to the whole process of metamorphic cell is carried out by using vc6.0 to transfer the basic bar group program to design the metamorphic motion pair for the whole process of metamorphic cell. According to the equivalent resistance gradient model and the design principle of the metamorphic kinematic pair for the whole process of metamorphic cell, the material transport mechanism is designed, and the resistance characteristics between the variable cell motion pairs are designed, and the kinematics simulation is carried out by establishing a three-dimensional model. The equivalent resistance gradient relationship between constrained metamorphic pairs was verified and the feasibility of the method was verified.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH112

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