The Application of Constraints in Assembly Models and Kinematic Simulations
Date Issued
2005
Date
2005
Author(s)
Chen, Yan-Shen
DOI
zh-TW
Abstract
In this paper, a data structure for building the 3D constraints and solving methods for closed-loop assemblies is proposed. This approach can apply to assembly models and kinematic simulations to deal with under-constraint, well-constraint and over-constraint. The proposed constraint solving method determines the assembly configuration by applying the following procedures: (1) Transforming the geometric mating constraints into the relative motion relations, (2) Build data structure from the relative motion relations, (3) Solving closed-loop constraint problem by data structure. Besides, it can optimize the solving efficiency by simplifying the objective function of the closed-loop kinematic joint and assembly constraint, and the assembly system well be more robust if a reasonable initial value is given.
This approach is able to manipulate the degrees of freedom of a closed-loop kinematic joint and find the precise positions of parts without deconstructing the data structure of the joint. Thus, it can not only maximize the efficiency and robustness of an assembly constraint solver, but also monitor all variables of the degree of freedom of a joint for the dynamic analysis.
Subjects
組裝拘束條件
組裝模型
求解拘束條件
幾何貼合
機構接頭
機構模擬
Assembly constraint
Assembly modeling
Constraint solving
Mating condition
Kinematic joint
Kinematic simulations
Type
thesis
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