Time Domain Modeling of Propeller Forces due to Ventilation in Static and Dynamic Conditions

Kozlowska, Anna Maria; Dalheim, Øyvind Øksnes; Savio, Luca; Steen, Sverre

doi:10.3390/jmse8010031

Cited by 10 publications

(4 citation statements)

References 3 publications

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“…At the end of the evaluation, functions with an F pi of 10.0 or higher were F15, F18, F19, F21, and F27, which were then used to evaluate the cause of the accident. For example, when the accident occurred, the ability to maneuver Function 15 was insufficient [34]. Function 15, the controller of the accident, was related to the master of the ship and was applied from the instant the ship departed from China until the collision.…”

Section: Analysis Of the Results Of The MV Milano Bridge Accident By ...mentioning

confidence: 99%

Using FRAM for Causal Analysis of Marine Risks in the Motor Vessel Milano Bridge Accident: Identifying Potential Solutions

Yu,

Ahn,

Lee

2023

Applied Sciences

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The levels of informatization, automation, and intelligence are continuously improving; however, the risks associated with the increased design and operational complexity of ship systems are increasing. Large-scale ship accidents can occur for several reasons. Existing accident analysis methods that examine marine accidents from the perspective of causal one-to-one correspondence have limitations in systematically analyzing complex marine risks during cause identification for the prevention of similar accidents. This study focuses on a systematic causality analysis of the factors related to human error in marine accidents that may occur during the arrival and departure of mega container ships. In particular, a representative case of the Motor Vessel (MV) Milano Bridge crane contact accident at Busan New Port is considered. To explore the complex organizational–technical, human–technical, and organizational–human relationships relevant to this case, human factors (seafarer, pilot, etc.) that are closely related to the linked causes were analyzed using the functional resonance analysis method. This study aims to reduce human error and prevent marine accidents, including pilotage.

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Section: Analysis Of the Results Of The MV Milano Bridge Accident By ...mentioning

confidence: 99%

Using FRAM for Causal Analysis of Marine Risks in the Motor Vessel Milano Bridge Accident: Identifying Potential Solutions

Yu,

Ahn,

Lee

2023

Applied Sciences

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“…For a high advance number, neglecting other effects is reasonable, otherwise the effect of ventilation can be much more severe than the emerged portion of the propeller. This is examined and discussed in [14] and [19]. Since the advance number is relatively high in this study, only the emerged portion of the propeller is included in our analysis.…”

Section: Diesel Enginementioning

confidence: 99%

“…She also suggested a calculation model for propeller thrust and torque diminution factor. Kozlowska et al [19] studied the dynamic effects on propeller loading during ventilation. They investigated the propeller forces under varying operational conditions for both steady and unsteady states.…”

Section: Introductionmentioning

confidence: 99%

Impact of Propeller Emergence on Hull, Propeller, Engine, and Fuel Consumption Performance in Regular Head Waves

Ghaemi

Zeraatgar

2022

Polish Maritime Research

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In this study, the impact of propeller emergence on the performance of a ship (speed), propeller (thrust, torque, and RPM), a diesel engine (torque and RPM) and fuel consumption are analysed under severe sea conditions. The goal is to describe the variation in the system variables and fuel consumption rather than analysing the motion of the ship or the phenomenon of propeller ventilation in itself. A mathematical model of the hull, propeller, and engine interactions is developed in which the propeller emergence is included. The system parameters are set using model experiments, empirical formulae, and available data for the engine. The dynamic response of the system is examined in regular head waves under submerged and emerged conditions of the propeller. The pulsatility and the extent of variation of 20 selected variables for the coupled system of hull, propeller, and engine are elaborated using quantitative and qualitative terms and absolute and relative scales. The simulation begins with a ship moving on a straight path, in calm water, with a constant speed for the ship, propeller and engine under steady conditions. The ship then encounters regular head waves with a known time series of the total resistance of the ship in waves. Large motions of the ship create propeller emergence, which in turn reduces the propeller thrust and torque. This study shows that for a specific ship, the mean ship speed, shaft angular velocity, and engine power were slightly reduced in submerged conditions with respect to calm water. We compared the mean values of the variables to those in the emerged condition, and found that the shaft angular velocity was almost the same, the ship speed was considerably reduced, and the engine power significantly dropped with respect to calm water. The ratios of the amplitude of fluctuation to the mean (Amp/Mean) for the ship speed and angular velocity of the shaft under both conditions were considerable, while the Amp/Mean for the power delivered by the engine was extremely high. The outcomes of the study show the degree of influence of propeller emergence on these variables. We identify the extent of each change and categorise the variables into three main groups based on the results.

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“…The next symposium in this series will be held in China in May 2021. This Special Issue comprises 17 excellent papers originating from the symposium [1-17] and two outstanding new papers [18,19]. The papers disseminate state-of-the-art numerical and experimental research results on marine propulsors and marine renewable devices.Marine propulsors are key components of the many thousands of ships operating in oceans, lakes, and rivers around the world.…”

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confidence: 99%

Selected Papers from the Sixth International Symposium on Marine Propulsors

Koushan

Steen

2020

JMSE

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Time Domain Modeling of Propeller Forces due to Ventilation in Static and Dynamic Conditions

Cited by 10 publications

References 3 publications

Using FRAM for Causal Analysis of Marine Risks in the Motor Vessel Milano Bridge Accident: Identifying Potential Solutions

Using FRAM for Causal Analysis of Marine Risks in the Motor Vessel Milano Bridge Accident: Identifying Potential Solutions

Impact of Propeller Emergence on Hull, Propeller, Engine, and Fuel Consumption Performance in Regular Head Waves

Selected Papers from the Sixth International Symposium on Marine Propulsors

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