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Journals / Journal of Eta Maritime Science / 2017 / Cilt: 5 - Sayı: 1

Evaluation of Mathematical Models for Tankers’ Maneuvering Motions

Tankerlerin Manevra Hareketleri için Matematiksel Modellerin Değerlendirilmesi

ERHAN AKSU
ERCAN KÖSE
Pages
95–109
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

As a result of the analysis, it can be summarised that MMG model based on the third order polynomial is superior to the one based on the second order polynomial in view of estimation accuracy of lateral hull force and yawing moment

📌 3 Key Takeaways

🎯
Objective & Hypothesis:In this study, the maneuvering performance of two tanker ships, KVLCC1 and KVLCC2 which have different stern forms are predicted using a system-based method.
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Key Findings & Data:Two different 3 DOF (degrees of freedom)mathematical models based on the MMG(Maneuvering Modeling Group) concept areappliedwith the difference in representing lateral force and yawing moment by second and third order polynomials respectively.
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Conclusion & Impact:As a result of the analysis, it can be summarised that MMG model based on the third order polynomial is superior to the one based on the second order polynomial in view of estimation accuracy of lateral hull force and yawing moment
🔬Design:Modeling & Simulation
📍Scope:Comprehensive Sample
⚙️Variables:Domain Parameters

Abstract

In this study, the maneuvering performance of two tanker ships, KVLCC1 and KVLCC2 which have different stern forms are predicted using a system-based method. Two different 3 DOF (degrees of freedom)mathematical models based on the MMG(Maneuvering Modeling Group) concept areappliedwith the difference in representing lateral force and yawing moment by second and third order polynomials respectively. Hydrodynamic coefficients and related parameters used in the mathematical models of the same scale models of KVLCC1 and KVLCC2 ships are estimated by using experimental data of NMRI (National Maritime Research Institute). The simulations of turning circle with rudder angle ±35o, zigzag(±10o/±10o) and zigzag (±20o/±20o) maneuvers are carried out and compared with free running model test data of MARIN (Maritime Research Institute Netherlands) in this study. As a result of the analysis, it can be summarised that MMG model based on the third order polynomial is superior to the one based on the second order polynomial in view of estimation accuracy of lateral hull force and yawing moment

Özet

Bu çalışmada farklı kıç formlarına sahip olan KVLCC1 ve KVLCC2 iki tanker gemisinin manevra performansları sistem temelli metoda dayalı olarak tahmin edilmiştir. Yanal kuvvetin ve savrulma momentinin ikinci ve üçüncü derece polinomlarla yazılması suretiyle, MMG (Matematiksel Modelleme Grubu) konseptine dayalı iki farklı 3 DOF ( serbestlik dereceli)matematiksel model uygulanmıştır. Matematiksel modellerdeki KVLCC1 ve KVLCC2 gemilerinin aynı ölçekte modellerinin hidrodinamik katsayıları ve ilgili parametreleri NMRI'nın (Ulusal Denizcilik Araştırma Enstitüsü, Japonya) deneysel verileri kullanılarak tahmin edilmiştir. Bu çalışmada dümen açısı ±35o ile dönme, zigzag(±10o/±10o) ve zigzag(±20o/±20o) manevra simülasyonları MARIN'nın (Hollanda Denizcilik Araştırma Enstitüsü) serbest model deney verileri ile birlikte yer almış ve karşılaştırılmıştır. Analizler sonucunda, yanal tekne kuvveti ve savrulma momentinin doğruluğu açısından üçüncü derece polinomla ifade edilmiş MMG modelinin ikinci derece ile ifade edilen modele göre daha üstün olduğu görülmektedir

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Cite This Article

AKSU, E., KÖSE, E. (2017). Evaluation of Mathematical Models for Tankers’ Maneuvering Motions. Journal of Eta Maritime Science, Cilt: 5 - Sayı: 1, 95–109. https://ajindex.com/articles/190726

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