The Analysis of Overall Ship Fuel Consumption in Acceleration Manoeuvre Using Hull-Propeller-Engine Interaction Principles and Governor Features

Zeraatgar, Hamid; Ghaemi, Mohammad Hossein

doi:10.2478/pomr-2019-0018

Cited by 21 publications

(15 citation statements)

References 7 publications

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“…The mathematical model of the engine is added to the whole model. The engine model used in this study is the same as that presented in [45], and is therefore not repeated here.…”

Section: Model Of Ship Manoeuvresmentioning

confidence: 99%

Framework of an Evolutionary Multi-Objective Optimisation Method for Planning a Safe Trajectory for a Marine Autonomous Surface Ship

Szlapczynski

Ghaemi

2019

Polish Maritime Research

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This paper represents the first stage of research into a multi-objective method of planning safe trajectories for marine autonomous surface ships (MASSs) involved in encounter situations. Our method applies an evolutionary multi-objective optimisation (EMO) approach to pursue three objectives: minimisation of the risk of collision, minimisation of fuel consumption due to collision avoidance manoeuvres, and minimisation of the extra time spent on collision avoidance manoeuvres. Until now, a fully multi-objective optimisation has not been applied to the real-time problem of planning safe trajectories; instead, this optimisation problem has usually been reduced to a single aggregated cost function covering all objectives. The aim is to develop a method of planning safe trajectories for MASSs that is able to simultaneously pursue the three abovementioned objectives, make decisions in real time and without interaction with a human operator, handle basic types of encounters (in open or restricted waters, and in good or restricted visibility) and guarantee compliance with the International Regulations for Preventing Collisions at Sea. It should also be mentioned that optimisation of the system based on each criterion may occur at the cost of the others, so a reasonable balance is applied here by means of a configurable trade-off. This is done throughout the EMO process by means of modified Pareto dominance rules and by using a multi-criteria decision-making phase to filter the output Pareto set and choose the final solution

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“…The mathematical model of the engine is added to the whole model. The engine model used in this study is the same as that presented in [45], and is therefore not repeated here.…”

Section: Model Of Ship Manoeuvresmentioning

confidence: 99%

Framework of an Evolutionary Multi-Objective Optimisation Method for Planning a Safe Trajectory for a Marine Autonomous Surface Ship

Szlapczynski

Ghaemi

2019

Polish Maritime Research

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“…Since planing craft are relatively light with a high power-to-weight ratio, they are normally very agile and maneuverable. Zeraatgar and Ghaemi 22 showed that a typical container ship needs about 200 s to change a speed of 9-11.8 m/s. This corresponds to an average surge acceleration of about 0.014 m/s 2 .…”

Section: Analysis Of Accelerating Test Resultsmentioning

confidence: 99%

Investigation of planing craft maneuverability using full-scale tests

Sadati

Zeraatgar

Moghaddas

2021

Proceedings of the Institution of Mechanical Engineers, Part M:

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Maneuverability of planing craft is a complicated hydrodynamic subject that needs more studies to comprehend its characteristics. Planing craft drivers follow a common practice for maneuver of the craft that is fundamentally different from ship’s standards. In situ full-scale tests are normally necessary to understand the maneuverability characteristics of planing craft. In this paper, a study has been conducted to illustrate maneuverability characteristics of planing craft by full-scale tests. Accelerating and turning maneuver tests are conducted on two cases at different forward speeds and rudder angles. In each test, dynamic trim, trajectory, speed, roll of the craft are recorded. The tests are performed in planing mode, semi-planing mode, and transition between planing mode to semi-planing mode to study the effects of the craft forward speed and consequently running attitude on the maneuverability. Analysis of the data reveals that the Steady Turning Diameter (STD) of the planing craft may be as large as 40 L, while it rarely goes beyond 5 L for ships. Results also show that a turning maneuver starting at planing mode might end in semi-planing mode. This transition can remarkably improve the performance characteristics of the planing craft’s maneuverability. Therefore, an alternative practice is proposed instead of the classic turning maneuver. In this practice, the craft traveling in the planing mode is transitioned to the semi-planing mode by forward speed reduction first, and then the turning maneuver is executed.

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“…Referring to Fig. 1, the first module has been already presented in [36]. The wave parameters were set in advance, and the variables of the generated wave are measured.…”

Section: Mathematical Modelmentioning

confidence: 99%

Negative impact of constant RPM control strategy on ship NOx emission in waves

Ghaemi

Zeraatgar

2022

Int J Energy Environ Eng

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In severe wave conditions, the ship propulsion system is loaded with high fluctuations due to external disturbances. The highly fluctuating loads enforce radical changes in the main engine torque, which in turn demands variation of the fuel rate injected into the cylinders if a constant rotational speed strategy is applied. Therefore, the temperature of gases varies to a large extent during the combustion process in the cylinders. The emitted NOx is a function of this highly fluctuating temperature. The main goal of this study is to investigate NOx emission under the aforementioned conditions when a usual constant RPM control strategy is applied in waves similar to the calm water condition. The paper presents a mathematical model of the whole system, which is applied to a selected ship both in regular waves and in calm water conditions. The results show that the sea waves, in comparison with the calm water condition, can radically increase the emitted NOx under the constant rotational speed strategy. This change can reach even 1014 times more, averagely. The results also show that the higher the wave height the higher the emitted NOx. It is concluded that the control strategy of keeping the engine rotational speed in waves at a constant level is the most important reason for the significantly increased NOx emission in waves in comparison with the calm water condition.

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The Analysis of Overall Ship Fuel Consumption in Acceleration Manoeuvre Using Hull-Propeller-Engine Interaction Principles and Governor Features

Cited by 21 publications

References 7 publications

Framework of an Evolutionary Multi-Objective Optimisation Method for Planning a Safe Trajectory for a Marine Autonomous Surface Ship

Framework of an Evolutionary Multi-Objective Optimisation Method for Planning a Safe Trajectory for a Marine Autonomous Surface Ship

Investigation of planing craft maneuverability using full-scale tests

Negative impact of constant RPM control strategy on ship NOx emission in waves

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