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Advances in Marine Propulsion II
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Advances in Marine Propulsion II

A special issue of Journal of Marine Science and Engineering (ISSN 2077-1312). This special issue belongs to the section "Ocean Engineering".

Deadline for manuscript submissions: closed (5 October 2023) | Viewed by 6693

Special Issue Editor

Prof. Dr. Nikolaos I. Xiros

E-Mail Website
Guest Editor
School of Naval Architecture and Marine Engineering, University of New Orleans, New Orleans, LA 70148, USA
Interests: watercraft systems; ocean engineering; marine power; electric & nuclear propulsion; dynamics & control; estimation; identification; modeling; simulation
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Following the success of the first edition of the Special Issue "Advances in Marine Propulsion", this second Issue aims to promote and publish new findings and technologies related to marine propulsion. Researchers are cordially invited to contribute findings and progress in the broader areas of marine and ocean engineering with emphasis on marine propulsion, power, energy and renewables as well as autonomous systems and watercraft, ocean robotics, mechatronics, electromechanics, dynamics and control.

The fields of research may include, but are not limited to, the following: digital signal processing, control theory, process modeling and simulation, system identification, dynamics and control, reliability and signal and data analysis.

Prof. Dr. Nikolaos I. Xiros
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Journal of Marine Science and Engineering is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • marine propulsion
  • power
  • energy
  • autonomous
  • watercraft
  • ocean robotics
  • electromechanics
  • hydrodynamic performance
  • azimuth thruster
  • ship propulsion
  • water jet propulsion
  • ship propeller

Published Papers (5 papers)

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Research

23 pages, 24072 KiB  
Article
Experimental Study on the Effect of Hull Deformation on the Relative Attitude between Shaft and Bearing
by Weixin Zhou, Yao Zhao, Hua Yuan and Zhaoxin Ren
J. Mar. Sci. Eng. 2023, 11(10), 1992; https://doi.org/10.3390/jmse11101992 - 16 Oct 2023
Viewed by 924
Abstract
The unclear change laws of bearing offset and rotation, both of which influence the condition of shaft alignment during hull deformation, make it difficult to optimize shafting design. In this paper, an integrated hull-bearing-shaft model is designed and built for a cantilever beam [...] Read more.
The unclear change laws of bearing offset and rotation, both of which influence the condition of shaft alignment during hull deformation, make it difficult to optimize shafting design. In this paper, an integrated hull-bearing-shaft model is designed and built for a cantilever beam loading test. Displacement sensors are utilized to determine the change in displacement of the hull, bearings, and shaft. The pressure distribution at the bow and stern ends of the bearing is measured using a new type of thin-film pressure sensor. The test results show that the rotation angle of the shaft and bearing varied differentially during hull deformation, and the magnitude of the shaft-bearing angle was comparable to the rotation angle. The measured rotation angles of the front and rear ends of the stern tube bearings are opposite to the theoretical value of a cantilever beam, indicating that the stern tube has a non-negligible effect on local deformation, and it is recommended to measure the bearings directly as opposed to the alternative structure to obtain the rotation. The change pattern of the shaft and bearing attitude does not change with the different initial state of the shaft, which indicates that the initial error of installation will be retained during the hull deformation process. The change pattern of the shaft and bearing attitude is unaffected by the initial state of the shaft, indicating that the initial installation error will persist during hull deformation. In some instances, the bearing reaction force remained unchanged, but the shaft-bearing angle and bearing pressure altered, indicating that the bearing condition cannot be determined solely by the bearing reaction force. The results of bearing pressure and the shaft-bearing angle can be compared, indicating that the thin-film pressure sensor can be used to determine the status of the shaft-bearing angle, particularly during the installation phase. Full article
(This article belongs to the Special Issue Advances in Marine Propulsion II)
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22 pages, 1894 KiB  
Article
Use of Synthetic Data in Maritime Applications for the Problem of Steam Turbine Exergy Analysis
by Sandi Baressi Šegota, Vedran Mrzljak, Nikola Anđelić, Igor Poljak and Zlatan Car
J. Mar. Sci. Eng. 2023, 11(8), 1595; https://doi.org/10.3390/jmse11081595 - 15 Aug 2023
Cited by 1 | Viewed by 775
Abstract
Machine learning applications have demonstrated the potential to generate precise models in a wide variety of fields, including marine applications. Still, the main issue with ML-based methods is the need for large amounts of data, which may be impractical to come by. To [...] Read more.
Machine learning applications have demonstrated the potential to generate precise models in a wide variety of fields, including marine applications. Still, the main issue with ML-based methods is the need for large amounts of data, which may be impractical to come by. To assure the quality of the models and their robustness to different inputs, synthetic data may be generated using other ML-based methods, such as Triplet Encoded Variable Autoencoder (TVAE), copulas, or a Conditional Tabular Generative Adversarial Network (CTGAN). With this approach, a dataset can be trained using ML methods such as Multilayer Perceptron (MLP) or Extreme Gradient Boosting (XGB) to improve the general performance. The methods are applied to the dataset containing mass flow, temperature, and pressure measurements in seven points of a marine steam turbine as inputs, along with the exergy efficiency (η) and destruction (Ex) of the whole turbine (WT), low-pressure cylinder (LPC) and high-pressure cylinder (HPC) as outputs. The achieved results show that models trained on synthetic data achieve slightly worse results than the models trained on original data in previous research, but allow for the use of as little as two-thirds of the dataset to achieve these results. Using R2 as the main evaluation metric, the best results achieved are 0.99 for ηWT using 100 data points and MLP, 0.93 for ηLPC using 100 data points and an MLP-based model, 0.91 for ηHPC with the same method, and 0.97 for ExWT, 0.96 for ExLPC, and 0.98 for ExHPC using a the XGB trained model with 100 data points. Full article
(This article belongs to the Special Issue Advances in Marine Propulsion II)
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15 pages, 4725 KiB  
Article
Proposed Z-Source Electrical Propulsion System of a Fuel Cell/Supercapacitor-Powered Ship
by Shihong Gan, Weifeng Shi and Xiaoyan Xu
J. Mar. Sci. Eng. 2023, 11(8), 1543; https://doi.org/10.3390/jmse11081543 - 02 Aug 2023
Cited by 1 | Viewed by 898
Abstract
The use of green energy to power ships in the marine industry has attracted increasing attention in recent years. This paper presents an inland river cruise ship supplied by a fuel cell (FC) as the main power source and a supercapacitor (SC) as [...] Read more.
The use of green energy to power ships in the marine industry has attracted increasing attention in recent years. This paper presents an inland river cruise ship supplied by a fuel cell (FC) as the main power source and a supercapacitor (SC) as the auxiliary power source. Its propulsion inverter adopts the proposed high-boost Z-source inverter, and the proposed high-voltage-boost Z-source inverter (HVB-ZSI) principle is studied. The advantages of this proposed HVB-ZSI in two cases are verified through simulation. In case 1, it can be seen that the capacitance voltage is only 250 V, and the maximum inductance’s inrush current at the start is less than 200 A. But the capacitance voltage of HVB-ZSI reaches 383 V, and the inrush current is 300 A. While considering different constraints of the propulsion system, four operating modes for the set of the FC and SC are proposed. The small-signal model of the propulsion system is derived, and the control strategy is studied. By controlling the shoot-through duty cycle and modulation factor, the FC power, output power, and state of charge (SOC) of the SC can be controlled. Finally, to verify the performance of the proposed propulsion system, a hybrid power ship prototype equipped with a 7.5 kw propulsion motor is constructed. Four modes of the entire system are simulated by MATLAB/SIMULINK, and its performance is analyzed with experimental results. These results show that the new Z-source propulsion system has a promising application in new energy ships, as it has higher reliability and lower complexity and cost compared to conventional propulsion systems. Full article
(This article belongs to the Special Issue Advances in Marine Propulsion II)
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24 pages, 2522 KiB  
Article
Study of the Hull Structural Deformation Calculation Using the Matrix Displacement Method and Its Influence on the Shaft Alignment
by Weixin Zhou, Yao Zhao, Hua Yuan and Xiaoqiang Wang
J. Mar. Sci. Eng. 2023, 11(8), 1495; https://doi.org/10.3390/jmse11081495 - 27 Jul 2023
Cited by 3 | Viewed by 1112
Abstract
The analysis of the influence of hull deformation on shaft alignment is predominately conducted using the finite element method (FEM), which is time-consuming, labor-intensive, and challenging to use for iterative hull design optimization. In this paper, hull deformation is separated into two parts—global [...] Read more.
The analysis of the influence of hull deformation on shaft alignment is predominately conducted using the finite element method (FEM), which is time-consuming, labor-intensive, and challenging to use for iterative hull design optimization. In this paper, hull deformation is separated into two parts—global deformation and local deformation, simplified to a single-span beam model and a grillage beam model, respectively—then solved using the matrix displacement method (MDM). Compared to FEM, the proposed method has a small calculation error, proving its correctness, while the calculation time is greatly reduced. The proposed method has been used to calculate the hull deformation of a ship under various conditions and evaluate its influence on shaft alignment. The results indicate that under certain conditions, the bearing reaction forces are constant, whereas the bearing pressure changes as a consequence of the change in shaft-to-bearing angle. The comparison between local rotation and shaft-to-bearing angle reveals that bearings in various positions follow distinct laws. We suggest that the shaft-to-bearing angle be used as an additional parameter in the evaluation of shaft alignment calculations. Moreover, when optimizing bearing pressure, bearings in different positions are affected differently by global and local deformation, and their optimization priorities are distinct. Full article
(This article belongs to the Special Issue Advances in Marine Propulsion II)
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16 pages, 3975 KiB  
Article
Research on Scale Effect of Resistance Components for Full-Formed Ship Based on Large-Scale Model Towing Test
by Chunyu Guo, Xianghai Zhong and Dagang Zhao
J. Mar. Sci. Eng. 2023, 11(7), 1300; https://doi.org/10.3390/jmse11071300 - 26 Jun 2023
Viewed by 1086
Abstract
In recent years, the International Maritime Organization (IMO) has gradually introduced more stringent new Ship Energy Efficiency Design Index (EEDI) bills, and transport ships are more inclined to reduce the speed and increase the length and square coefficient to meet the design requirements. [...] Read more.
In recent years, the International Maritime Organization (IMO) has gradually introduced more stringent new Ship Energy Efficiency Design Index (EEDI) bills, and transport ships are more inclined to reduce the speed and increase the length and square coefficient to meet the design requirements. However, the size of the ship model that can be accommodated in the towing tank is seriously limited. Under the action of the scale effect, the accuracy of the prediction results of the resistance performance of large ships is particularly prominent. To break through the limitations of the test site, a large-scale ship model resistance towing test system and data analysis method in the port were established. By comparing with the results of small-scale model tests in the towing tank, the applicability of the 1957 ITTC friction line and Grigson friction line in the resistance prediction of the full-formed ship was analyzed, and the scale effects of resistance components were also examined. The results show that the scale effect of the form factor of full-formed ships is weak. The three-dimension method based on the empirical formula of mixed-form friction resistance of ITTC-Grigson is more suitable for predicting the resistance performance of full-formed ships. Full article
(This article belongs to the Special Issue Advances in Marine Propulsion II)
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