Comparative Performance between Two Photogrammetric Systems and a Reference Laser Tracker Network for Large-Volume Industrial Measurement

This paper determines the capability of two photogrammetric systems in terms of their measurement uncertainty in an industrial context. The first system – V-STARS inca3 from Geodetic Systems Inc. – is a commercially available measurement solution. The second system comprises an off-the-shelf Nikon D700 digital camera fitted with a 28 mm Nikkor lens and the research-based Vision Measurement Software (VMS). The uncertainty estimate of these two systems is determined with reference to a calibrated constellation of points determined by a Leica AT401 laser tracker. The calibrated points have an average associated standard uncertainty of 12·4 μm, spanning a maximum distance of approximately 14·5 m. Subsequently, the two systems’ uncertainty was determined. V-STARS inca3 had an estimated standard uncertainty of 43·1 μm, thus outperforming its manufacturer's specification; the D700/VMS combination achieved a standard uncertainty of 187 μm

Implementing Digital Enterprise Technologies for Agile Design in the Virtual Enterprise

Digital Enterprise Technology (DET) is defined as a synthesis of digital and physical systems across the product lifecycle which can be exploited for two main benefits: risk mitigation through consistent and seamless data standards; and reduction in product development times through improved access to the most accurate project data at any time, from anywhere, by anyone. Agility is defined as responsiveness to unpredictability, particularly unpredictable events in the environment external to a process. The general need for agile response in turbulent environments is well documented and has been analyzed at the manufacture phase. This paper introduces a framework for an agile response to these turbulent environments during the design stages of product development. The Agile Design Framework is based on the founding principles described as DET, with the added benefit of reduced reaction time and therefore greater agility in the face of unpredicted external events. A 4 level classification scheme for event impact is discussed and a common toolbox of Digital Enterprise Technologies (Core Tools) for agile design is introduced. The paper proposes the implementation of the DET-based Core Tools during a meta-design stage, for maximum benefit from the synergies of the many systems

Special issue on '6th CIRP-Sponsored International Conference of Digital Enterprise Technology (DET2009) - Enterprise Informatics'

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Foundations of an Agile Design Methodology

Modern design projects typically are undertaken concurrently in a virtual enterprise network of expert design and manufacturing agents. The general need for agile response in turbulent environments is well documented and has been analysed at the manufacturing phase. This paper proposes a framework to enable analysis of an agile design methodology. This models the occurrence of an unexpected event in a concurrent design project. The redistribution of the design work can be controlled within the virtual enterprise, and the total redistribution impact can be measured. A four-level classification scheme for the severity of unexpected events is proposed. Each event level is illustrated with a design scenario. A Monte Carlo-based simulation tool is proposed for work redeployment policy analysis

A Methodology for Negotiating Change Propagation in Agile Design.

Modern design projects are typically undertaken concurrently in a virtual enterprise network of expert design and manufacture agents. The general need for agile response in turbulent environments is well documented and has been analysed at the manufacture phase. This paper proposes a framework to enable analysis of an agile design methodology. This models the occurrence of an unexpected event in a concurrent design project. The redistribution of the design work can be controlled within the virtual enterprise and the total redistribution impact can be measured. A trial design experiment is conducted, and a qualitative analysis is performed based on Work Transformation Matrix (WTM). A design negotiation process based on the WTM is proposed