2 research outputs found
Virtual reality based creation of concept model designs for CAD systems
This work introduces a novel method to overcome most of the drawbacks in traditional methods for creating design models. The main innovation is the use of virtual tools to simulate the natural physical environment in which freeform. Design models are created by experienced designers. Namely, the model is created in a virtual environment by carving a work piece with tools that simulate NC milling cutters.
Algorithms have been developed to support the approach, in which the design model is created in a Virtual Reality (VR) environment and selection and manipulation of tools can be performed in the virtual space. The desianer\u27s hand movements generate the tool trajectories and they are obtained by recording the position and orientation of a hand mounted motion tracker. Swept volumes of virtual tools are generated from the geometry of the tool and its trajectories. Then Boolean operations are performed on the swept volumes and the initial virtual stock (work piece) to create the design model.
Algorithms have been developed as a part of this work to integrate the VR environment with a commercial CAD/CAM system in order to demonstrate the practical applications of the research results. The integrated system provides a much more efficient and easy-to-implement process of freeform model creation than employed in current CAD/CAM software. It could prove to be the prototype for the next-generation CAD/CAM system
Quality function deployment opportunities in product model supported design
This thesis describes the development of a QFD information model established in
an environment where design information is shared between software applications. The
main objectives of the research are to establish a QFD information structure within a
Product Data Model and to demonstrate how this enables an intelligent, knowledgebased
analysis of QFD information contained in a Product Model.
The generic structure of the QFD information has been defined and implemented
in prototype software and its value is demonstrated through experimentation in two
case studies. Successful implementation of the case studies proved that the QFD
information structure is able to capture QFD information as persistent objects residing
in a Product Model. It also demonstrates that an intelligent knowledge-based QFD
expert can be implemented alongside the QFD information model to accomplish useful,
consistent, reasoned analysis of QFD information.
The research has achieved its aim to provide a new contribution in the product
design domain, and to the effectiveness of Concurrent Engineering activities, through
better use of Quality Function Deployment