Overview

This dissertation, Haptic Rendering of Three-dimensional Heterogeneous Features by Lili, Lian, 廉莉莉, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled HAPTIC RENDERING OF THREE-DIMENSIONAL HETEROGENEOUS FEATURES Submitted by Lian Lili for the degree of Doctor of Philosophy at The University of Hong Kong in February 2007 Haptic interaction provides the operator a full immersion in the virtual environment by offering an additional communication modality - the force feedback between the user and the computer. In recent years, haptic related research has attracted intensive interest, but most previous work has been restricted to modeling and haptic rendering of virtual models with homogeneous features. This study focuses on the haptic rendering algorithms of three-dimensional heterogeneous features and their applications to product design. In this study, heterogeneous features are characterized as both material and geometric variations, and haptic rendering of heterogeneous features is implemented in three disciplines. The first discipline focuses on the haptic rendering of heterogeneous rough surface and frictional surface of rigid objects. The haptic rendering of roughness and friction is implemented based on the generation of fine surface features. Three-dimensional geometric variations of fine surface features are created by a procedural method followed by a feature mapping approach. Improvement of the lateral-force algorithm and the Karnopp-based algorithm is developed to haptically render heterogeneous surface roughness and friction. The second discipline focuses on the haptic rendering of deflection or small deformation of an object consisted of heterogeneous materials. Haptic rendering of flexible objects is attributed in between haptic rendering of rigid objects and that of deformable objects. Therefore, a pseudo-rigid-body model is developed to model the flexible object and calculate the feedback forces. Pseudo-rigid-body models consisting of different materials are assembled in a certain way to simulate a heterogeneous object. The proposed approach is also applied to a haptic aided product design case study. In the third discipline, the haptic rendering of deformable objects composed of heterogeneous materials is investigated. A multi-layer mass-spring system is used to represent the deformable object. The relationship between the physical properties of the materials being simulated and the physical parameters of the model is investigated. A surface-based force-mapping method is developed to haptically display the proposed mass-spring system. This method simplifies a volume-based model into a surface-based model and maintains the material information of the inner volume of the model simultaneously. As a result, the haptic rendering of heterogeneous material objects can be realized. Furthermore, system computation acceleration is implemented by a proposed multi-resolution and multi-rate method. DOI: 10.5353/th_b3875820 Subjects: User interfaces (Computer systems)TouchVirtual realityAlgorithms

Full Product Details

9781374661967

Table of Contents

Reviews

Author Information

Tab Content 6

Customer Reviews

Recent Reviews

Countries Available