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Maneuvering & Dynamic Stability Study of Planing Hulls

Fathi Kazerooni, Mohammad Reza | 2018

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 51011 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Seif, Mohammad Saeed
  7. Abstract:
  8. Planing hulls have been under rapid development during recent years and their maximum speed has increased significantly thanks to advancements in high power engines and light weight hull construction methods. In the past two decades, the main concern have been hydrodynamic characteristics and stability of the planing hulls in straight-line motion in calm and rough water, and no applied mathematical model is proposed for their dynamic motions in different maneuvers in contrast to displacement hulls. Moreover, control loss at high speeds is very prevalent and in most cases this leads to economy and human losses. The main target of this thesis is to develop and validate a mathematical model to study the effect of different design parameters such as center of gravity position, length to breadth ratio, and deadrise on transverse stability of planing hulls during the early design stages. Several dynamic models are compared and equations of motion are rewritten in a form to consider the effect of trim and dynamic rise on maneuvering motions. Consequently, a model of hydrodynamic derivatives are determined and it is validated through model tests in towing tank. The scale effects due to limited model size is studied in detail during model tests, especially for planing regime. Finally, the dynamic stability criteria is established based on the stability roots of equations of motion and effects of design parameters on stability roots are studied
  9. Keywords:
  10. High Speed Craft ; Dynamic Instability ; Model Test ; Planning Boat ; Flight Maneuver

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