Browsing by Author "ElMaraghy, H. A."

Now showing 1 - 3 of 3
  • Thumbnail Image
    ItemOpen Access
    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.
  • Thumbnail Image
    ItemOpen Access
    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.
  • Thumbnail Image
    ItemOpen Access
    Symbiotic Design of Products and Manufacturing Systems Using Biological Analysis
    (Cranfield University Press, 2009-03-31) AlGeddawy, T. N.; ElMaraghy, H. A.; Rajkumar Roy; Essam Shehab
    Changes in manufacturing systems are oftenly driven by product design variations that exist at specific points in time, and gradual product design changes that appear over time. Further interactions take place to fully utilize established manufacturing system capabilities when considering product future designs. This is common in eco-systems when two or more different species co-evolve simultaneously, and it has inspired the development of a new model to capture the symbiotic relationship between products and their manufacturing systems based on Cladistics which is commonly used in biology. The obtained hierarchal order was analyzed in depth to track the product changes record and guide the next design steps to benefit from system capabilities.