The influence of route choice and operating conditions on fuel consumption and CO2 emission of ships

Prpić-Oršić, Jasna; Vettor, Roberto; Faltinsen, Odd M.; Soares, C. Guedes

doi:10.1007/s00773-015-0367-5

Cited by 54 publications

(17 citation statements)

References 22 publications

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“…The influence of loading condition and initial ship speed on attainable ship speed is analyzed in [25]. The change of loading conditions means the change of wetted hull surface (and above water area) and affects all aspects of the attainable ship speed calculation: estimation of still water and added resistance, wind loads, seakeeping performance (absolute and relative motions), propulsive performance, etc.…”

Section: Figure 2 Ship Speed Loss For Head Sea Figure 3 Ship Speed mentioning

confidence: 99%

Uncertainties of Ship Speed Loss Evaluation Under Real Weather Conditions

Prpić-Oršić

Sasa

Valčić

et al. 2020

Journal of Offshore Mechanics and Arctic Engineering

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A correct assessment of the ship speed loss in conditions of operation is becoming increasingly important for ship owners as well as ship designers. We are witnessing increasing concern for the environment and awareness of the necessity to preserve it as much as we could. The ship speed drop in the real environmental conditions can cause increased fuel consumption as well as increased emissions of CO2 and other greenhouse gases (GHGs) from ships. Decrease in the ship speed in real conditions is a consequence of the added resistance due to the impact of weather conditions and due to aggravated propeller working conditions. Moreover, the solution estimation of this problem is very much affected by human factors. Ship master, concerning for safety, can make a judgment that under certain adverse weather loads, it is necessary to slowdown or change ship's course to moderate or bypass the worst condition. In addition, the loading condition of the ship is constantly changing, which governs the basic parameters of the ship: the mass and mass moment of inertia, draft and trim and, consequently, the ship behavior at sea. All these parameters affect the assessment of ship speed, and it is necessary to be conscious of the intensity of their impact on the final value. At the same time, they cannot be predicted with absolute certainty, so the purpose of this analysis is to estimate the impact of weather and operational uncertainties on the actual speed of the ship in real operating conditions.

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Section: Figure 2 Ship Speed Loss For Head Sea Figure 3 Ship Speed mentioning

confidence: 99%

Uncertainties of Ship Speed Loss Evaluation Under Real Weather Conditions

Prpić-Oršić

Sasa

Valčić

et al. 2020

Journal of Offshore Mechanics and Arctic Engineering

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“…Course-keeping quality is significant in ship navigation due to time-saving and reduced fuel consumption (Prpic-Orsic et al, 2016). To achieve quality ship course-keeping and generate accurate heading angles, a controller that considers ship hydrodynamicsincluding both internal and external disturbance parameters-should be installed (Lee et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…To achieve quality ship course-keeping and generate accurate heading angles, a controller that considers ship hydrodynamicsincluding both internal and external disturbance parameters-should be installed (Lee et al, 2009). Keeping a ferry ship on course differs from sea-going ships due to navigation environments and ship particulars (Prpic-Orsic et al, 2016). The navigation environment's complexity, and especially wind-load forces and moment, makes ferry ships with large superstructures more susceptible to marine accidents (Fujiwara and Ueno, 2006).…”

Section: Introductionmentioning

confidence: 99%

Twin-Rudder-System Configurations’ Impact on Ferry Ships’ Course-Keeping Ability under Windy Conditions

Muhammad¹,

Paroka²,

Rahman³

et al. 2021

IJTech

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Ship course-keeping plays a vital role in navigation safety, especially when a ship is operating under windy conditions. A method to control ship movements through rudder-system configuration is necessary to stabilize a ship's course. This paper describes the twin-rudder-system configuration design's impact on a ship's course-keeping ability under windy conditions. A timedomain simulation using the MATLAB-Simulink program was developed for this purpose. A proportional integral derivative (PID) controller was used to adjust the ship's heading angle according to the desired path. Several parameters-such as relative wind velocity and directionswere accounted for in the simulation. The result shows that, at a wind direction of 88 o , the ship's course-keeping speed decreased; however, increasing wind velocity caused a large deviation in the ship's heading angle. Meanwhile, the ship's course-keeping speed increased with rising windspeed directions of 219 o . The ship's course-keeping time, at around 219 o under the simulation's wind direction, was 11.84% lower than during a previous sea-trial. A possible reason for this difference is that the simulation excluded waves and currents.

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“…Aarsaether and Moan [8] addresses the human element of navigation, presenting a human operator model and showing its effect on manoeuvring patterns using simulation. First of all, the economic and environmental consequences of poorly planned and executed route and speed management can be significant [9,10]. The operations research community has for many years worked on weather routing algorithms, which provides recommendations for future route and speed.…”

Section: Introductionmentioning

confidence: 99%

Operational sea passage scenario generation for virtual testing of ships using an optimization for simulation approach

et al. 2020

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In this paper, a model for implementation of sea passage operational scenarios in the context of simulation-based design of ships is presented. To facilitate the transition towards more energy-efficient shipping, the ability to evaluate and understand ship and ship system behaviour in operational conditions is central. By introducing an optimization model in virtual testing frameworks, operational scenarios can be generated that enhances scenario relevance and testing abilities. The optimization for simulation approach provides speed and course commands based on an optimization framework which factors in the operational considerations and sea state conditions in the area of operation. Impact on the understanding of ship system performance using simulation is assessed in a case study where a sea passage over the North Pacific is replicated for varying operational scenarios and seasons. It is found that the variation of operational scenario, affecting the sea state and speed relation, causes significant differences in required power and fuel consumption estimates. Sea passage control is found to be an important dimension in virtual testing approaches.

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The influence of route choice and operating conditions on fuel consumption and CO2 emission of ships

Cited by 54 publications

References 22 publications

Uncertainties of Ship Speed Loss Evaluation Under Real Weather Conditions

Uncertainties of Ship Speed Loss Evaluation Under Real Weather Conditions

Twin-Rudder-System Configurations’ Impact on Ferry Ships’ Course-Keeping Ability under Windy Conditions

Operational sea passage scenario generation for virtual testing of ships using an optimization for simulation approach

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