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MANOEUVRING OF HIGH-SPEED SHIPS

Explore instabilities impacting stability & safety of high-speed craft, incorporating mathematical model advancements & research progress. Learn about different types of instabilities, mathematical modeling elements, external forces, and the impact of the new model on ship motion.

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MANOEUVRING OF HIGH-SPEED SHIPS

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  1. MANOEUVRING OF HIGH-SPEED SHIPS Mr.E. ARMAOGLU SSRC, Dept of Naval Architecture & Marine Engineering, Universities of Glasgow and Strathclyde, UK

  2. Presentation Outline Introduction - Aims Types of Instabilities of HSC Current Mathematical Model The Path to be Followed Current Research Progress

  3. Introduction Manoeuvring of High Speed Craft from Stability and Safety Point of View WATCH OUT FOR COLLISIONS!!! Prevention (IMO 1997): Sufficient Controllability Adequate Dynamic Stability Sufficient Manoeuvrability

  4. Introduction Recommendation From The 22nd ITTC Specialist Committee of High Speed Marine Vehicles Problems relating to High-Speed roll, pitch and directional stability anomalies must be solved with accompanying model tests to find the effect of Position of Centre of Gravity and GM on course-stability and capsize.

  5. Types of Instabilities of HSC INSTABILITIES DEFINED BY ITTC and more… Pure Loss of Stability (Loss of GM due to wave system) Course Keeping (e.g. Broaching, Parametric Rolling) Bow-Diving Chine-Tripping Spray-Rail Engulfing Porpoising Additionally Chine-walking and Corkscrew

  6. Current Mathematical Model Manoeuvring Mathematical Model by Dr. AyazFeatures: 6 Degrees of Freedom Frequency Dependent Coefficients Incorporating Memory Effects No Restrictions on Motion Amplitudes Axis System That Allows Combination of Seakeeping and Manoeuvring Models

  7. Mathematical Model System of Coordinates

  8. Mathematical Model

  9. Mathematical ModelEquations of Motion Where m is the mass of a ship, HG the momentum about the centre of gravity,  the angular velocity, VG the linear velocity and XF,XMthe external force and moment vectors, respectively.

  10. Mathematical ModelEquations of Motion

  11. Mathematical ModelEquations of Motion  denotes rudder or pod angle, g and a represent horizontal and vertical component of wave amplitude where, M is inertia Matrix, A is added inertia matrix, B is damping coefficient matrix, C is restoring coefficient matrix, F is external force vector and w is wave amplitude.

  12. Mathematical ModelExternal Forces W indicates wave forces and moments, H indicates hull (manoeuvring) forces and moments and radiation forces and moments for vertical motions, RS indicates resistance forces, RD indicates rudder forces and moments and P indicates propeller forces and moments

  13. Mathematical ModelExternal Forces[Automatic Control] The standard proportional-differential (PD) autopilot is employed in this model Ris the actual rudder angle, R is the desired heading angle, k1 is yaw angle gain constant, k2 is yaw rate gain constant and tr is the time constant in rudder activation

  14. The Effect of the New Mathematical Model on Motion

  15. The Effect of the New Mathematical Model on Motion

  16. The Path to be Followed Steady Manoeuvring Motion Effect of Running Attitude on Manoeuvring Hydrodynamic Forces at High Speed Unsteady Manoeuvring Motion Memory Effects Oscillatory Instabilities Effect of Vertical Lift Force on Stability Motion Non-Oscillatory Instabilities Effect of Vertical Lift Force on Manoeuvring Hydrodynamic Forces

  17. An Oscillatory Type Instability for a High-Speed Craft: Coupling Between Horizontal and Vertical Motions Experiment Video from Osaka Prefecture University is Presented with Permission of Dr. Toru Katayama

  18. The Challenge HAVING A MATHEMATICAL MODEL TO ACCOUNT FOR ALL THESE PROBLEMS IN EXTREME RANDOM WAVES FOR HIGH-SPEED CRAFTS

  19. The Current Research Progress Investigation of the behavior of high-speed craft at irregular seas based on this mathematical model is progressing. Further steps include the addition of vertical lift component and coupling effects between vertical and horizontal motions to our mathematical model.

  20. Questions?

  21. THANK YOU FOR LISTENING 

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