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Hydro-aerodynamic Mathematical Model and Optimization of WIG Craft Performance at Take-off Phase by Genetic Algorithm

Tavakkoli Dakhrabadi, Mohammad | 2016

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 49447 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Seif, Mohammad Saeed
  7. Abstract:
  8. In this thesis attempted to present practical hydro-aerodynanic model with low computational time and high accuracy for WIG craft with a compound wing, a catamaran hull form and a power augmented ram (PAR) platform at take-off phase. To achieve this innovation, aerodynamic and hudrodynamic model are coupled and dynamic air cushion between demi hull of catamaran under the wing was considered by modeling PAR platform with effect of flap. To validaty the results of hydro-aerodynanic model, two test models were producted and the results of hydro-aerodynanic model are compared with the experimental results that the presented results had good agreement with the experimental results. Influence of junction position of outer wing on the main wing is investigated on the static height stability of WIG craft by presented aerodynamic model. According to the presented hydro-aerodynanic model, multi-objective optimization is performed by genetic algorithm basis of Pareto optima. Three objective functions goals – reduced of hump resistance, increased compound wing lift-to-drag ratio, and reduced take-off speed– are selected. The longitudinal position of center of gravity, position of outer wing with respect to main wing, PAR system angle to horizontal and flap angle are also adopted as design variables. Static height stability and the location of the center of gravity with respect to the aerodynamics centers were considered as constraints for the stable flight in ground effect
  9. Keywords:
  10. Multiobjective Optimization ; Mathematical Modeling ; Takeoff ; Wing-In-Ground Effect ; Genetic Algorithm ; MATHEMATICAL MODELING ; Fly Boats ; Hydrodynamics

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