Analysis of hull, propeller and engine interactions in regular waves by a combination of experiment and simulation

Ghaemi, Mohammad Hossein; Zeraatgar, Hamid

doi:10.1007/s00773-020-00734-5

Cited by 20 publications

(19 citation statements)

References 10 publications

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“…Several approaches of hull-propeller-engine interaction are available in the technical literature, although they mainly focus on the effects of the added resistance in waves, as underlined by [43]. In particular, in [43] the authors propose an interaction model of hullpropeller-engine by combining experimental data and numerical simulation in regular seas.…”

Section: Introductionmentioning

confidence: 99%

Simulation Modeling of a Ship Propulsion System in Waves for Control Purposes

Acanfora

Altosole

Balsamo

et al. 2021

JMSE

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The article deals with a simulation approach to the representation of the ship motions in waves, interacting with the propulsion system behavior (diesel engine and propeller). The final goal is the development of a simulator, as complete as possible, that allows the analysis of the main engine thermodynamics in different sea conditions, also in the unfavorable event of dynamic instability of the hull, and the correct management of the other propulsion components. This latter aspect is particularly interesting in some of the last new energy solutions for decarbonization of ships, concerning, for example, auxiliary electric motors, powered by batteries, to support the traditional diesel-mechanical propulsion (especially in heavy weather conditions). From this point of view, a proper analysis of the engine dynamic performance, affected by particular sea states, is fundamental for a smart management and control of shaft generators/auxiliary electric motors, batteries, etc. To this end, the work presents and highlights the main features of a ship simulator, suitable for the study of the new propulsion solutions that are emerging in maritime transport. Some representative results will point out the complex non-linear behavior of the propulsion plant in waves. Moreover, a parametric roll scenario will be investigated, in order to highlight the capability of the conceived simulator in modeling the effects of the dynamic instability of the hull on the propulsion plant.

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Section: Introductionmentioning

confidence: 99%

Simulation Modeling of a Ship Propulsion System in Waves for Control Purposes

Acanfora

Altosole

Balsamo

et al. 2021

JMSE

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“…Finally, a detailed discussion is provided. The selected ship is a container vessel, presented in [36], where the data regarding ship resistance and propeller parameters, as well as propulsive coefficients, are described based on the model tests, Zeraatgar and Ghaemi [37]. For clarification purposes, the ship and propeller specifications are given in Table 2.…”

Section: Resultsmentioning

confidence: 99%

“…It contains the calm water resistance and time series of wave force in the x-direction, which have been concluded from model tests. The second and third modules are described in [37]. The fourth module has been adapted so that the steady-state model applied in [36] is replaced by the meanvalue zero-dimensional (MVZD) model described in [38].…”

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 vessel model contained a mean value engine model of a large two-stroke diesel with exhaust gas recirculation, as well as models of propeller and ship resistance, and thus it was used to investigate the performance of exhaust gas recirculation and other controllers during transients. Ghaemi and Zeraatgar 27 carried out an investigation on ship propulsion system dynamics under sea wave conditions by using a mathematical model that can describe the interaction between hull, propeller and engine. The outcomes explained influence of the governor and its limiters on fuel consumption, and identify the nonlinear impact of sea waves on propeller characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…Summarizing the previous research efforts in this field, although numerous studies have developed models of engine-propller-hull with different complexity, the research focus was either the engine performance or the ship manoeuvrability, and thus there were still limitations on investigating the coupling effects between the diesel engine propulsion system and ship manoeuvrability. In the studies focusing on ship manoeuvrability, diesel engines were usually represented by simplified models, in which the engine was represented by a first order function with a delay response 27 or simulated by a power matrix depending on the engine speed and fuel index. 20 These models can only output the engine torque and power, and cannot reflect the dynamic response of scavenging receiver, exhaust receiver, turbocharger and other internal components during ship manoeuvring motion; in the studies focusing on the performance of diesel engines, the ship motion models were typically modelled based on longitudinal motion, and they were insufficient to be used to study the effect of the propulsion system performance on ship manoeuvrability in three degrees of freedom (DOFs).…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of interaction between propulsion system behaviour and manoeuvrability of a large containership

Huan

Chen

2021

Proceedings of the Institution of Mechanical Engineers, Part M:

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In actual operation process of a ship, the engine-propeller-hull is an integrated system with internal coupling effects, and thus there is a close interaction between the diesel engine propulsion system operation conditions and the ship manoeuvring motions. The propulsion system can experience large power fluctuation during manoeuvring, with considerable torque increase with regard to the stabilized value in straight course. However, the diesel engine propulsion system behaviour and ship manoeuvrability are usually studied separately as they are considered to belong to different disciplines. Thus, it is difficult to reflect the actual operating characteristics of the propulsion system and ship manoeuvring motion under coupled conditions in actual operation. To investigate the interaction between the propulsion system behaviour and the manoeuvrability of a large containership, this paper proposed a multi-disciplinary ship mobility model capable of coupling the marine diesel engine model and the ship manoeuvring model. In the engine model, the mean value modelling approach was adopted to simulate the two-stroke marine diesel engine considering the fact that it can capture the performance of the engine sub-systems including scavenging receiver, exhaust gas receiver, turbocharger, etc. In the manoeuvring model, the MMG-based method was used to simulate the ship manoeuvring motion with three degrees-of-freedom. The engine model and manoeuvring model were coupled through the propeller model that transferring propeller speed and torque between the two models. The coupled model was validated against the engine shop test data and the sea trial results. By applying this coupled model, a series of simulations of turning circle manoeuvres under various scenarios were performed. The simulation results presented the dynamic response of engine internal sub-systems during turning circle manoeuvring, explained the effect of the torque limiter on engine performance and ship manoeuvring motion, and analyse the influence of different propulsion system control strategies on the ship turning circle manoeuvrability. Although the presented case study has been validated on a specific ship, most of the discussed models have a general application.

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Analysis of hull, propeller and engine interactions in regular waves by a combination of experiment and simulation

Cited by 20 publications

References 10 publications

Simulation Modeling of a Ship Propulsion System in Waves for Control Purposes

Simulation Modeling of a Ship Propulsion System in Waves for Control Purposes

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

Numerical investigation of interaction between propulsion system behaviour and manoeuvrability of a large containership

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