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35 results on '"Elmaraghy, W. H."'

14. Assessing the Complexity of a Recovered Design and its Potential Redesign Alternatives

Author

Urbanic, R. J., ElMaraghy, W. H., Rajkumar Roy, and Essam Shehab

Subjects
Product Complexity, Design Recovery, Redesign
Abstract

Organised by: Cranfield University Reverse engineering techniques are applied to generate a part model where there is no existing documentation or it is no longer up to date. To facilitate the reverse engineering tasks, a modular, multiperspective design recovery framework has been developed. An evaluation of the product and feature complexity characteristics can readily be extracted from the design recovery framework by using a modification of a rapid complexity assessment tool. The results from this tool provide insight with respect to the original design and assists with the evaluation of potential alternatives and risks, as illustrated by the case study. Mori Seiki – The Machine Tool Company

Published
2009

15. A Periodicity Metric for Assessing Maintenance Strategies

Author

Meselhy, K. T., ElMaraghy, W. H., ElMaraghy, H. A., Rajkumar Roy, and Essam Shehab

Subjects
Maintenance, manufacturing systems, periodicity, complexity
Abstract

Organised by: Cranfield University The maintenance policy in manufacturing systems is devised to reset the machines functionality in an economical fashion in order to keep the products quality within acceptable levels. Therefore, there is a need for a metric to evaluate and quantify function resetting due to the adopted maintenance policy. A novel metric for measuring the functional periodicity has been developed using the complexity theory. It is based on the rate and extent of function resetting. It can be used as an important criterion for comparing the different maintenance policy alternatives. An industrial example is used to illustrate the application of the new metric. Mori Seiki – The Machine Tool Company; BAE Systems; S4T – Support Service Solutions: Strategy and Transition

Published
2009

16. Comprehensive Complexity-Based Failure Modeling for Maintainability and Serviceability

Author

Meselhy, K. T., ElMaraghy, H. A., ElMaraghy, W. H., Rajkumar Roy, and Essam Shehab

Subjects
Manufacturing Systems, Maintenance, Failure, Complexity, Serviceability
Abstract

Organised by: Cranfield University Failures are the primary triggers for repair and maintenance actions. A clear definition of failure events is important in order to improve maintainability and serviceability. A comprehensive complexity-based mathematical definition of failure is introduced. The applicability of the developed failure model to different complexity definitions is discussed. A new metric is introduced to capture the change in complexity associated with function degradation. A case study is presented to illustrate the application of the new failure definition and metric. The developed approach for failure modeling can be used for maintenance planning. Mori Seiki – The Machine Tool Company; BAE Systems; S4T – Support Service Solutions: Strategy and Transition

Published
2009

28. Using a Modified Failure Modes and Effects Analysis within the Structured Design Recovery Framework.

Author

Krause, Frank-Lothar, Urbanic, R. J., and ElMaraghy, W. H.

Abstract

A structured design recovery framework has been designed to meet the challenges associated with creating a robust engineering model for mechanical components. To assist with the testing and verification phase of the design recovery process, a matrix based modified failure modes and effects analysis (FMEA) has been developed, which targets tolerance variations, in order to diagnose potential problems. The information within the design recovery framework is extracted for the modified FMEA analysis. From the FMEA results, testing strategies are suggested based on the component characteristics. An example illustrates the modified FMEA methodology and highlights its merits. [ABSTRACT FROM AUTHOR]

Published
2007
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31. Design recovery of internal and external features for mechanical components.

Author

Urbanic, R. J. and Elmaraghy, W. H.

Subjects
*REVERSE engineering, *SCANNING systems, *GEOMETRIC surfaces, *CURVES, *WIREFRAME drawing, *ALGORITHMS, *HEURISTIC, *MODULAR design
Abstract

Contemporary reverse engineering (RE) tools focus on generation of free-form shapes from point cloud data collected from scanning systems. The final model contains a set of surfaces and curves that have no functional meaning, and noise due to manufacturing variations or wear are contained within the model. A different approach is required in order to create a more suitable model for engineered components because of these issues. To meet these challenges, a systematic approach is adopted in a comprehensive manner to extract the relevant information and transform it into pertinent design knowledge. A modular design recovery framework is presented that captures the component's structure, function and feature information at varying perspectives. To complement the framework, form recovery algorithms have been developed to transform point cloud data into wire frame geometry consisting of standard line and arc elements. Once the points are converted into curve primitives, adjustments are made to capture the design intent using heuristics, and common shapes and two-dimensional (2D) patterns are detected. From this geometry, a surface or solid model can be constructed using established geometry creation tools. Several case studies are presented that illustrate the form recovery algorithms to highlight their merits. [ABSTRACT FROM AUTHOR]

Published
2008
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