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Register a new userStudying the dynamic behavior of the rolling ship on irregular waves (Tow Dimension spreading)
دراسة السلوك الديناميكي للسفينة المتأرجحة عرضياً على الأمواج الحقيقية (عند الانتشار ثنائي البعد للأمواج)
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Added by
Tishreen University ورقة بحثية
Publication date
2016
fields
Marine Engineering
and research's language is
العربية
Created by
Shamra Editor
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تعتبر دراسة السلوك الديناميكي للسفينة المتأرجحة عرضيا على الأمواج من المواضيع ذات الأهمية الخاصة, و ذلك نظرا لارتباطها الوثيق بأمان السفينة التوازني, و تأثيرها المباشر على كفاءة عمل بعض الأنظمة و العمليات داخل بدن السفينة. يتضمن هذا البحث شرحاً للنموذج الرياضي المقترح و الخاص بدراسة السلوك الديناميكي للسفينة المتأرجحة عرضيا على الأمواج الحقيقية بهدف حساب منحنيات السعة مع امان كتابع لعرض السفينة عند القيم المختلفة لحالة التحميل و سرعة السفينة و زاوية خط سيرها بالنسبة إلى الاتجاه الرئيسي لانتشار الأمواج, و بالتالي تحديد سرعات السفينة و زوايا خط سيرها المسببة لأشد التأرجحات العرضية عند حالة التحميل المعتبرة, إضافةإلى تحديد العرض الحرج المقابل للسرعة التصميمية المختارة للسفينة. تم إعداد برنامج حاسوبي بلغة ( ) لتنفيذ الحسابات وفقاً للنموذج المقترح, مما سمح بدراسة تأثير بعض البارامترات الاستثمارية للسفينة (كسرعة السفينة, و زاوية خط سيرها بالنسبة إلى الاتجاه الرئيسي لانتشار الأمواج) على سعة التأرجحات العرضية. تم التوصل من خلال هذا البحث إلى استخراج علاقات رياضية تسمح بوضع تفسير دقيق و واضح للسلوك الديناميكي للسفينة المتأرجحة عرضيا على الأمواج البحرية.
Studying of the dynamic behavior of the rolling ship on sea waves is one of topics of special interest due to its close association with the ship stability and its direct impact on the efficiency of the work of some of the systems and processes inside the hull. This paper includes an explanation of the proposed mathematical model to study the dynamic behavior of the rolling ship on irregular waves in order to calculate the curves as a function of ship breadth at different values of ship speed, bearing angle and metacenter high, and thus determine the ship speed and bearing angle that causing resonance at defined value of metacenter high. In addition to determine the critical breadth coincide with the design speed of the ship. A computer program was prepared to perform calculations according to the proposed model, which allowed studying the effect of some parameters of the investment of the vessel (ship speed, and the angle of its route for the main direction of spread of the waves) on ship rolling. It had been reached through this research to extract mathematical equations which allow a precise and clear explanation of the dynamic behavior of the ship rolling on waves.
References used
KOBYLINSKI, L. K; KASTNER, S. Stability and Safety of Ship . Elsevier, USA, 2003, 412
BLAGOVESHCHENSKY, S. N.Theory of ship motions . Dover, New York,1962,649
MOLLAND, A. F.Maritime Engineering Reference Book . Butterworth- Heinemann, Oxford, 2008, 907
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The study of the dynamic behavior of the rolling ship on sea waves is one of most interesting topics, due to its close association with the ship stability and its direct impact on the efficiency of the work of some of the systems and processes inside
the hull. This research includes an explanation of the proposed mathematical model to study the dynamic behavior of the rolling ship on regular sinusoidal waves in order to calculate the Transfer Function of ship response continued to the act of wave-induced transverse oscillation and thus determine the frequency of resonance and the maximum value for the Transfer Function. A computer program was prepared to perform calculations according to the proposed model, which allowed studying the effect of some parameters of the investment of the vessel (ship speed, and the angle of its route for the main direction of spread of the waves) at a frequency of resonance and the maximum value for the Transfer Function, and also allowed to study the effect of Some of the parameters of the surrounding medium (wave frequency) to the maximum value for the Transfer Function. Through this research, it had been reached to extract mathematical equation which allows a precise and clear explanation of the dynamic behavior of the ship rolling on waves.
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