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Register a new userThe Study of the Dynamic Behavior of the Rolling Ship on Regular Waves
دراسة السلوك الديناميكي للسفينة المتأرجحة عرضيّاً على الأمواج الجيبية المنتظمة
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Added by
Tishreen University ورقة بحثية
Publication date
2014
fields
Marine Engineering
and research's language is
العربية
Created by
Shamra Editor
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تعتبر دراسة السلوك الديناميكي للسفينة المتأرجحة عرضيّاً على الأمواج من المواضيع ذات الأهمية الخاصة, وذلك نظراً لارتباطها الوثيق بأمان السفينة التوازني, وتأثيرها المباشر على كفاءة عمل بعض الأنظمة والعمليات داخل بدن السفينة. يتضمن هذا البحث شرحاً للنموذج الرياضي المقترح والخاص بدراسة السلوك الديناميكي للسفينة المتأرجحة عرضيّاً على الأمواج الجيبية المنتظمة بهدف حساب تابع الخاصية السعوية لاستجابة السفينة بفعل الموجة المحرضة على التأرجح العرضي, ومن ثمّ تحديد تردد الطنين والقيمة العظمى للخاصية السعوية. تم إعداد برنامج حاسوبي بلغة ( ) لتنفيذ الحسابات وفقاً للنموذج المقترح, مما سمح بدراسة تأثير بعض البارامترات الاستثمارية للسفينة (كسرعة السفينة, وزاوية خط سيرها بالنسبة إلى الاتجاه الرئيسي لانتشار الأمواج) على تردد الطنين والقيمة العظمى للخاصية السعوية, كما سمح أيضاً بدراسة تأثير بعض بارامترات الوسط المحيط (كتردد الموجة الجيبية) على القيمة العظمى للخاصية السعوية. تم التوصل من خلال هذا البحث إلى استخراج علاقات رياضية تسمح بوضع تفسير دقيق وواضح للسلوك الديناميكي للسفينة المتأرجحة عرضيّاً على الأمواج البحرية
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.
References used
J.M.J. Journée & W.W. Massie,. Offshore Hydrodynamics, Netherlands, 2001
K.J.Rawson & E.C.Tupper., Basic Ship Theory, Butterworth-Heinemann, Oxford, 2001
Tony Molland,.Maritime Engineering Reference Book, Butterworth-Heinemann, Oxford, 2008
Lech k. Kobylinski &Sigismund Kastner,. Stability and Safety of Ship, 2003
Welnicki,W,. Mechanika Ruchu okretu,Skrypt dla studentow, Instytut Okretowy PG, Gdansk 1989
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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 ins
ide 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.
This article aims to the model the influence of geometrical errors
(eccentricity and alignment errors) on static and dynamic behavior
of helical geared transmission by studying its influence on the load
and the transmission errors. For this propos
, a dynamic model is
developed to geared transmission with 36 degree of freedom
(tension –compression , torsion and bending). The equations of
motion are solved by combining a time-step integration algorithms
with several iterative and Newmark's method .
Summary of subject lines like all components of the electrical power system, for
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of the system, and is a source of threat to the continuity of power supply. In
order to
prevent these crashes completely is not feasible, you must design an integrated protection
system is being coordinated action among all its organs to identify and separate the
holidays quickly so the damage caused by this failure the system capacity as possible.
Network protection devices are installed to protect it from faults that may occur, and
prevent their spread and protect the system from un normal operating situations resulting
from such faults. protection systems to identify, classify and locate of faults through
systematic analysis of network parameters) voltages/currents, (and then send a signal to
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generators. we found through modeling and simulation results that a wind station to impose
changes on the structure of power system of protection zones and protection devices in
response to the types of faults occurring and the reason for the delay in the work of these
protections.
Bleaching process of cotton fabrics consider an important and
sensitive operations in wet chemical treatments of cotton fabrics,
mercerization is not less important than them and that in cases in which
is made necessary, but from the problems of t
hese processes are long
time and consumption of energy, but the ultrasound energy contribute
to reduce these problems.
Let R be a ring with identity.
The ain is to study some fundamental properties of a ring R when R is regular
or semi-potent and the radical Jacobson of R when R is semi-potent.
New results were obtained including necessary and sufficient condition
s of R
to be regular or semi-potent. New substructures of R are studied and their
relationship with the total of R.
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