Rule-based approaches for controlling oscillation mode dynamic systems

This dissertation presents new fuzzy logic techniques for designing controlsystems for a wide class of complex systems. The methods are developed in detail for acrane system which contains one rigid-body and one oscillation mode. The craneproblem is to transfer the rigid body a given distance such that the pendulatlon of theoscillation mode is regulated at the final time using a single control input. Theinvestigations include in-depth studies of the time-optimal crane control problem as anintegral part of the work. The main contributions of this study are:(1) Development of rule-based systems (both fuzzy and crisp) for the design of optimalcontrollers. This development Involves control variable parametrization. rule derivation. with parameter perturbation methods. and the design of rule based controllers. which can. be combined with model-based feedback control methods.(2) A thorough Investigation and analysis of the solutions for time-optlmal controlproblems of oscillation mode systems. with particular emphasis on the use of phase-planeinterpretation.expected to rise in the future due to demolition of oldconcrete buildings.The recycled-aggregate concretes were produced usingcrushed concrete derived from the original gravel concrete.Recycling of solid wastes is not a new concept. Industrialwastes are the basis of many concrete admixtures, such as, flyash, blast-furnace slags etc.The main objective of this thesis is to investigate theapplicability of recycling gravel concrete as an aggregate.The effects of water-cement ratio and cement content onrecycled-aggregate experimentally werethe physical and mechanical properties of and recycled-aggregate concreteinvestigated.In addition a brief cost estimate of recycled aggregate processing was introduced.