Representation of drawings in CAD systems can cause problems during design collaboration. The notion of re-representation is proposed as one way of addressing these problems. Furthermore, re-representation is one way of allowing emergence to occur; emergence is an important aspect of collaborative computer-mediated design. Based on the concept of re-representation a model for collaborative CAD ...

The existing collaborative systems are restricted on one specific CAD system and do not support multiple systems. However, employing various CAD systems to facilitate the product design process is not uncommon. This paper presents an approach for collaborative design environment to support a set of heterogeneous CAD systems such that an object can be geometrically co-modelled simultaneously amo...

The objective is to split a simply connected polygon into a set of convex quadrilaterals without inserting new boundary nodes. The presented approach consists in repeatedly removing quadrilaterals from the polygon. Theoretical results pertaining to quadrangulation of simply connected polygons are derived from the usual 2-ear theorem. It produces a quadrangulation technique with O(n) number of q...

To enable the designers to design and modify model of nuclear channel head quickly and easily, we constructed the CAD system of the nuclear channel head. At first, we analyzed the geometric characteristics of nuclear channel, established of feature control parameter set and the parametric model of nuclear channel head. Secondly, other parameters related to the solid modeling are described throu...

a. Mechanical Engineering Laboratory, National Engineering School of Monastir, Monastir University, Av. Ibn Eljazzar, 5019 Monastir, Tunisia. a, b. LIPPS, ÉTS, 1100, Notre-Dame Ouest, Montréal, H3C1K3, Québec, Canada. [email protected], [email protected] Abstract: The part and assembly requirements are specified by the tolerances. In the Digital Mock-Up (DMU), the product ...

Industrial facilities are becoming increasingly complex, which profoundly affects their planning and operation. Architectural structures, infrastructure and machines are planned using CAD software, but, typically, many alterations are made during actual construction and installation. These alterations usually do not find their way back into the CAD models. In addition, there may be a large body...

With recent developments in CAD and communication technologies, the way we visualise and communicate design representations is changing. A matter of great interest to architects, practitioners and researchers alike, is how computer technology might affect the way they think and work. The concern is not about the notion of ‘support’ alone, but about ensuring that computers do not disrupt the des...

Physical gages permit verification with low uncertainties but remain expensive and inflexible. With the development of 3D CAD modellers and the progress made in coordinate measuring machines, the concept of the virtual gage appeared. The paper focuses on the implementation rather than the inspection of dimensional and geometrical tolerancing in 3D-CAD models of mechanical assemblies by the use ...

..........................................................................................ix CHAPTER 1. INTRODUCTION ..................................................................................1 1.1 Statement of purpose ..................................................................................1 1.2 Research questions ................................................................

A virtual vehicle is a digital model of the knowledge surrounding a potentially real vehicle. Knowledge consists not only of the tangible information, such as CAD, but also what is known about the knowledge – its metadata. This paper is an overview of technologies relevant to building a virtual vehicle, and an assessment of how to bring those technologies together.