الفهرس 
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Abstract
The accurate prediction of fault trends and remaining life of engineermg components have continuously been the concern of many investigators as well as industrial specialists since the evolution of machinery condition monitoring technologies in the earl seventies. The advent of “reliabilit based maintenanc&’ requires the presence of tools that can quickly and accurately determine the integrity and soundness of machinery components before and after their assembly. Fatigue represents the major factor in the decay of component life and in its flnal total loss. The introduction of techniques such as “modal analysis” and “operational modal analysis’’ is expected to help in determining the reliability of machine components from the start point of their commissioning stage. This thesis represents a step towards the main goal of detemiining the reliability of engineering cc mponents and machines. The thesis introduces a new technique for determining the remaining fatigue life of engineering components using the results of non-destructive Modal tests.