Journal ArticleDOI
Virtual assembly technologies based on constraint and DOF analysis
TLDR
To realize VA reasonably, uniform representations of assembly constraint, equivalent relation between constraint and degree of freedom (DOF), and movable DOF reduction are defined and several algorithms including based-constraint assembly relation recognition, assembly parts location solving under free and constrained spaces, and movement navigation are developed.Abstract:
Assembly constraint is an important factor for product assembly. Constraint is not only necessary for accurate locating of parts but also an important way to realize assembly operation process in virtual assembly (VA) system. In this study, to realize VA reasonably, uniform representations of assembly constraint, equivalent relation between constraint and degree of freedom (DOF), and movable DOF reduction are defined. Several algorithms including based-constraint assembly relation recognition, assembly parts location solving under free and constrained spaces, and movement navigation are developed. These algorithms have been applied to integration virtual assembly environment (IVAE) software system. An example is illustrated, and the results prove that the algorithms provide a good support for the constraint treatments in IVAE and the high consistence between virtual and real assembly process is realized.read more
Citations
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Journal ArticleDOI
Augmented assembly technologies based on 3D bare-hand interaction
Soh-Khim Ong,Zengbo Wang +1 more
TL;DR: In this paper, a hybrid method based on constraint analysis is presented, which interprets users' manual assembly intents robustly without the need for auxiliary CAD information, and algorithms for assembly constraint recognition, assembly tool operations and assembly sequence evaluation have been formulated.
Journal ArticleDOI
Augmented reality aided interactive manual assembly design.
TL;DR: A hybrid approach based on these methods has been formulated and implemented to allow the users to simulate a manual assembly without the need for auxiliary computer-aided design information in assembly design, resulting in enhanced user experience and reduced preparation time.
Journal ArticleDOI
Full length Article: Assembly simulations in virtual environments with optimized haptic path and sequence
Christiand,Jungwon Yoon +1 more
TL;DR: In this paper, an intelligent virtual assembly system is described in which an optimal assembly algorithm is used to allow haptic interactions during virtual assembly operations. But the authors focus on the task of gripper selection, inter-part movement, and part assembly.
Journal ArticleDOI
Real-virtual components interaction for assembly simulation and planning
TL;DR: In this article, the authors present a novel assembly simulation system incorporating real-virtual components interaction in an augmented-reality based environment, where users can manipulate and assemble virtual components to real components during assembly simulation using natural gestures through an enhanced bare-hand interface.
Journal ArticleDOI
Integration of Virtual Labs into Science E-learning
TL;DR: This paper aims to design and implement 3D virtual labs, which are considered as a low-cost alternative to educators and students, in science E-learning, and designs and implements a complex application that combines advanced visualization, interactive management through complex virtual devices and intelligent components.
References
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Virtual assembly using virtual reality techniques
TL;DR: This paper presents a research effort aimed at creating a virtual assembly design environment that combines 3D computer graphics with advanced input and output devices for design for assembly.
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Virtual reality as a tool for verification of assembly and maintenance processes
TL;DR: The steps needed to apply virtual reality (VR) for virtual prototyping (VP) to verify assembly and maintenance processes and show that VR will play an important role for VP in the near future are investigated.
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Geometric constraint solver
TL;DR: The architecture of the solver is described, with particular emphasis on the theoretical and human factors involved in finding a solution, in an exponentially large search space, so that the solution is appropriate to the application, and the way of finding it is intuitive for an untrained user.
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VADE: a Virtual Assembly Design Environment
TL;DR: The overall system, the important features, and examples of using VADE are described; the benefits and limitations of virtual assembly systems are discussed; and automated assembly planning systems are compared.
Journal ArticleDOI
Dynamics of parallel manipulators by means of screw theory
TL;DR: In this paper, an approach based on the theory of screws and on the principle of virtual work is proposed to calculate the actuator forces as a function of the external applied forces and the imposed trajectory.