Browsing by Author "Meselhy, K. T."

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    Comprehensive Complexity-Based Failure Modeling for Maintainability and Serviceability
    (Cranfield University Press, 2009-04-01) Meselhy, K. T.; ElMaraghy, H. A.; ElMaraghy, W. H.; Rajkumar Roy; Essam Shehab
    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.
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    A Periodicity Metric for Assessing Maintenance Strategies
    (Cranfield University Press, 2009-04-01) Meselhy, K. T.; ElMaraghy, W. H.; ElMaraghy, H. A.; Rajkumar Roy; Essam Shehab
    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.