Virtual assembly operations with grasp and verbal interaction

Weiwei, Zhao; Madhavan, Viswanathan

doi:10.1145/1128923.1128964

Cited by 10 publications

(4 citation statements)

References 12 publications

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“…The corresponding frame-rate is plotted in Fig. 14. It can be seen that the frame-rates are well above the desired frame rate (Zhao and Madhavan 2006).…”

Section: Generalitymentioning

confidence: 87%

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A dual-representation strategy for the virtual assembly of thin deformable objects

Mishra

Suresh

2009

Virtual Reality

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The two main objectives of virtual assembly are: (1) to train assembly-operators through virtual assembly models, and (2) to simultaneously evaluate products for ease-of-assembly. The focus of this paper is on developing computational techniques for virtual assembly of thin deformable beam and plate-like objects. To meet the objectives of virtual assembly, the underlying computational technique must: (1) be carried out at a high framerate ([20 frames/second), (2) be accurate (\5% error in deformation and force estimation), (3) be conducive to collision detection, and (4) support rapid design evaluations. We argue in this paper that popular computational techniques such as 3-D finite element analysis, boundary element analysis and classic beam/plate/shell analysis fail to meet these requirements. We therefore propose a new class of dual representation techniques for virtual assembly of thin solids, where the geometry is retained in its full 3-D form, while the underlying physics is dimensionally reduced, delivering: (1) high computational efficiency and accuracy (over 20 frames per second with \1% deformation error), and (2) direct CAD model processing, i.e., the CAD model is not geometrically simplified, and 3-D finite element mesh is not generated. In particular, a small-size stiffness matrix with about 300 degrees of freedom per deformable object is generated directly from a coarse surface triangulation, and its LU-decomposition is then exploited during real-time simulation. The accuracy and efficiency of the proposed method is established through numerical experiments and a case study.

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“…The corresponding frame-rate is plotted in Fig. 14. It can be seen that the frame-rates are well above the desired frame rate (Zhao and Madhavan 2006).…”

Section: Generalitymentioning

confidence: 87%

“…Must be carried out at a high frame rate; typically, 20 frames/s or higher to be in sync with human response (Brooks 1999;Zhao and Madhavan 2006). 2.…”

Section: Brief Review Of Popular Computational Methodsmentioning

confidence: 99%

A dual-representation strategy for the virtual assembly of thin deformable objects

Mishra

Suresh

2009

Virtual Reality

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“…Voice commands oriented the virtual human waling in virtual environment avoiding the limitation of movement space caused by tracking equipment. Windshield deicer assembly simulation of a Cessna aircraft was investigated as application [2].Shao-Wen Chang et al proposed task evaluation method in virtual environment for prevention of work-related musculoskeletal disorders. Digital human model was introduced for virtual dynamics simulation.…”

Section: Related Workmentioning

confidence: 99%

A Human-Centered Virtual Assembly System

Chen

Xia

Lang

et al. 2009

AMM

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Virtual manufacturing technology has become an effective method for decision and planning in manufacturing. Due to ergonomics problems are widely concerned in assembly design planning, a human-centered virtual assembly system framework is proposed for ergonomics analysis for assembly operation in this paper. The six-layer framework integrates virtual human modeling, motion capture and recognition, ergonomics evaluation and virtual assembly process planning as an organic whole. Data exchanging and system function are discussed based on this framework. The work in virtual reality (VR) technology, motion capture technology, ergonomics method and optimization method for implementing the system is also described. The framework would provide a new approach for the combination of virtual manufacturing and ergonomics analysis in the future.

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“…With the use of VR, more realistic computer generated assembly environments can be created and by using 3DITs, products can be manipulated, assembled and disassembled as required [112]. The application of immersive virtual reality in a virtual model of the assembly environment, can help design and evaluate manufacturing tasks and different possible sequences, and choose the best alternatives [113]. Also, by immersing a real person into the virtual environment, which interacts directly with the elements of a simulated virtual world, ergonomic data can also be acquired [1].…”

Section: Assemblymentioning

confidence: 99%

Development of virtual and augmented reality environment for manufacturing

Ρέντζος¹

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The aim of this work is to study the development of virtual and augmented reality environment for the support of human-based processes in manufacturing. Virtual and augmented reality technologies can significantly reduce the development time and cost of products and processes in manufacturing. However there is currently a big gap between the conventional CAD-based processes and the advanced prototyping and validation methods offered with the use of VR and AR technology. There is a need for the virtual environments to be enriched with intelligence through the incorporation of knowledge. This will allow for complex tasks to be carried out, thus reducing the need for an ad hoc development, while the reusability of such an environment will be increased. On the one hand, augmented reality environments based on semantic knowledge and new user interaction methods can provide the means for putting the human back in the process loop at manufacturing level. On the other hand, virtual reality environments coupled with semantic knowledge can provide methods and tools that integrate 3D geometries with information/knowledge so that engineers can effectively evaluate and manipulate virtual prototypes in an immersive and interactive environment. Within the current dissertation, a generic VR and AR approach is developed based on human task analysis and knowledge mapping methods that are implemented in a Virtual and Augmented Reality Framework. The VR/AR framework is developed to be used with the two-step method approach using advanced interaction techniques. The developed method and framework are validated through a series of real life manufacturing test cases derived from both the automotive and aerospace industrial practices. Finally, an evaluation of the proposed methods and framework is carried out, based on one of the industrial test cases using quantitative metrics, giving insight on to the improvement of the engineering workflow using the proposed work compared with the conventional physical workflow.

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Virtual assembly operations with grasp and verbal interaction

Cited by 10 publications

References 12 publications

A dual-representation strategy for the virtual assembly of thin deformable objects

A dual-representation strategy for the virtual assembly of thin deformable objects

A Human-Centered Virtual Assembly System

Development of virtual and augmented reality environment for manufacturing

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