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Kinematic Analysis Based on Assembly Geometry Model

Author: LiMingHao
Tutor: HuangZhengDong
School: Huazhong University of Science and Technology
Course: Digital design and manufacturing
Keywords: Assembly model Assembly features Spinor theory Drive the relationship matrix Instantaneous motion
CLC: TH163
Type: Master's thesis
Year: 2007
Downloads: 57
Quote: 1
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Abstract


Mechanical assembly model, the movement of the parts is determined by the assembly relationships. However, the vast majority of commercial CAD system established assembly relations, still rely on manual input modeling parts movement. So that not only a low efficiency and difficult to ensure the consistency of the motion model and the original mounting structure, usually is difficult to fully reflect the parts of the movable. In research and analysis of the current situation of the related fields at home and abroad on the basis of instantaneous motion analysis method based on part geometry information and spatial assembly configuration relationship, while the analysis of the results of the guidance assembly design modification. A method according to the spatial location of the assembly model parts automatically generated assembly features. The method by comparison of geometric equation with the boundary of the surface of the part, the surface contact between the parts relationship and type, thereby establishing the characteristics of the assembly between the parts, and then, based on assembly feature adjacency matrix generated parts. The assembly features twenty relative mobility modeling method. Konkar algorithm intersection operations generate assembly features - surface contact Total movable surface of the method according to the assembly features - surface contact type, application spinor theory defined surface - surface relative mobility spiral The mathematical model of the direction of its spiral. Deputy campaign is part of the spiral model model for common assembly features. Proposed assembly model parts overall mobility and drive relationship analytical methods. The method parts adjacency matrix parts diagram, constructed by breadth-first spanning tree of the graph, the spanning tree and parts diagram to determine the closed-loop motion in the assembly model institutions, Applied Physics Ji Erhuo Norio loop rule generating a loop topology matrix parts, combining the movement between the helix model, solving the constraint any nonadjacent twenty satisfy closed-loop relative movability of the spiral, and gives between the parts can be driven, determination conditions, thereby generating a driving matrix assembly model expressed in different parts of the drive relationship. To verify this theory, the development of a prototype software system of parts for assembly model instantaneous motion analysis. The system in UG NX3.0 environment, Visual C 6.0, Matlab 6.5 and UG / Open software development tools, assembly geometry information extraction, the deputy campaign mathematical model generate parts of the motion analysis system can function; and examples to verify the correctness and validity of the theoretical methods. Concluded the full text, and further research directions prospect.

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