Polish Maritime Research最新文献

An Experimental Study of the Effects of Cylinder Lubricating Oils on the Vibration Characteristics of a Two-Stroke Low-Speed Marine Diesel Engine 气缸润滑油对二冲程低速船用柴油机振动特性影响的实验研究

IF 2 3区工程技术

Polish Maritime Research Pub Date : 2023-12-01 DOI: 10.2478/pomr-2023-0062

Gang Wu, Guodong Jiang, Changsheng Chen, Guohe Jiang, Xigang Pu, Bi-we Chen

{"title":"An Experimental Study of the Effects of Cylinder Lubricating Oils on the Vibration Characteristics of a Two-Stroke Low-Speed Marine Diesel Engine","authors":"Gang Wu, Guodong Jiang, Changsheng Chen, Guohe Jiang, Xigang Pu, Bi-we Chen","doi":"10.2478/pomr-2023-0062","DOIUrl":"https://doi.org/10.2478/pomr-2023-0062","url":null,"abstract":"Abstract Two-stroke, low-speed diesel engines are widely used in large ships due to their good performance and fuel economy. However, there have been few studies of the effects of lubricating oils on the vibration of two-stroke, low-speed diesel engines. In this work, the effects of three different lubricating oils on the vibration characteristics of a low-speed engine are investigated, using the frequency domain, time-frequency domain, fast Fourier transform (FFT) and short-time Fourier transform (STFT) methods. The results show that non-invasive condition monitoring of the wear to a cylinder liner in a low-speed marine engine can be successfully achieved based on vibration signals. Both the FFT and STFT methods are capable of capturing information about combustion in the cylinder online in real time, and the STFT method also provides the ability to visualise the results with more comprehensive information. From the online condition monitoring of vibration signals, cylinder lubricants with medium viscosity and medium alkali content are found to have the best wear protection properties. This result is consistent with those of an elemental analysis of cylinder lubrication properties and an analysis of the data measured from a piston lifted from the cylinder after 300 h of engine operation.","PeriodicalId":49681,"journal":{"name":"Polish Maritime Research","volume":"1112 1","pages":"92 - 101"},"PeriodicalIF":2.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139019356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Human Resource Management Digitalisation in Multidisciplinary Ship Design Companies 多学科船舶设计公司的人力资源管理数字化

IF 2 3区工程技术

Polish Maritime Research Pub Date : 2023-12-01 DOI: 10.2478/pomr-2023-0065

Piotr Bilon, Wojciech Litwin

{"title":"Human Resource Management Digitalisation in Multidisciplinary Ship Design Companies","authors":"Piotr Bilon, Wojciech Litwin","doi":"10.2478/pomr-2023-0065","DOIUrl":"https://doi.org/10.2478/pomr-2023-0065","url":null,"abstract":"Abstract The digitalisation in the ship design sector is currently applied to the design process itself and is well defined, partially standardised and practically implemented by both independent design companies and the design departments of shipyards. The situation is similar in other sectors of engineering. However, the requirements for the digitalisation of other processes in design and engineering companies have not previously been studied, and the limited financial resources of ship design companies mean that there is a need for research on the digitalisation needs of multidisciplinary ship design companies. The implementation of building information modelling (BIM) solutions is costly for design companies and generates benefits mainly for shipyards and shipowners. The lack of benefits for design companies leads to the hesitation of managers whenever digitalisation is considered; the scope and scale of the digitalisation, as well as the selected software and BIM level, are defined by the shipyard requirements. The participation and support of management in the digitalisation process is one of the key success factors; the expected benefits caused by digitalisation for the organisation will increase the motivation of managers to invest limited resources in digitalisation. There are no data that indicate the processes with a high potential for digitalisation and the scale of expected improvements in ship design companies; therefore, research in this area was performed with a group of project managers from design and engineering companies. The research focused on collecting the opinions and experiences of the managers related to the manual management of resources and comparing the poll results with the conclusions from the enterprise resource planning (ERP) system data analyses. The paper analyses if the digital automation of the resource management process can lead to the substantial improvement of the operations of multi-project, multidisciplinary engineering ship design companies.","PeriodicalId":49681,"journal":{"name":"Polish Maritime Research","volume":"109 ","pages":"120 - 128"},"PeriodicalIF":2.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139015808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of Sway and Roll Excitations on Sloshing Loads in a KC-1 Membrane LNG Tank 摇摆和滚动激振对 KC-1 膜液化天然气储罐中的荡载的影响

IF 2 3区工程技术

Polish Maritime Research Pub Date : 2023-12-01 DOI: 10.2478/pomr-2023-0057

Se-yeol An, Hyeon-won Jeong, Ohyoung Kim, W. Jaewoo Shim

{"title":"Effects of Sway and Roll Excitations on Sloshing Loads in a KC-1 Membrane LNG Tank","authors":"Se-yeol An, Hyeon-won Jeong, Ohyoung Kim, W. Jaewoo Shim","doi":"10.2478/pomr-2023-0057","DOIUrl":"https://doi.org/10.2478/pomr-2023-0057","url":null,"abstract":"Abstract This study investigates the effects of sway and roll excitations on sloshing liquid loads in a tank, using Ansys Fluent software. The model considered in the study is a 1:50 scaled membrane-type tank, based on a KC-1 membrane LNG tank designed by Korea Gas Corporation (KOGAS). The volume of fluid (VOF) method is used to track the free surface inside the tank, and the standard k-ε model is applied to express the turbulent flow of the liquid. To explore the motion of the tank under excitation, a user-defined function (UDF) and a dynamic mesh technique are employed to control the external forces exerted on the tank through its motion. The results, in the form of time series data on the sloshing pressures in the tank under pure sway, roll, and coupled sway-roll, are analysed, with specific ranges for the excitation amplitudes and frequencies. We show that variations in excitation frequency and amplitude significantly influence the sloshing loads. Sloshing loads are found to intensify when the excitation frequency matches the tank’s primary natural frequency, 1.0 ω1′. Furthermore, with coupled sway-roll excitations, the sloshing loads are weakened when the sway and roll are in-phase and are intensified when these are out-of-phase. Fast Fourier transform analysis provides insights into the frequency domain, showing that the dominant frequency is 0.88 Hz and it is approximately equal to the tank’s primary natural frequency, 1.0 ω1′.","PeriodicalId":49681,"journal":{"name":"Polish Maritime Research","volume":"30 3","pages":"43 - 53"},"PeriodicalIF":2.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139016452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of Propeller Fouling on the Hydrodynamic Performance of a Marine Propeller 螺旋桨污垢对船用螺旋桨水动力性能的影响

IF 2 3区工程技术

Polish Maritime Research Pub Date : 2023-12-01 DOI: 10.2478/pomr-2023-0059

A. Zinati, M. Ketabdari, H. Zeraatgar

{"title":"Effects of Propeller Fouling on the Hydrodynamic Performance of a Marine Propeller","authors":"A. Zinati, M. Ketabdari, H. Zeraatgar","doi":"10.2478/pomr-2023-0059","DOIUrl":"https://doi.org/10.2478/pomr-2023-0059","url":null,"abstract":"Abstract Propeller performance is typically considered under clean conditions, despite the fact that fouling is an inevitable phenomenon for propellers. The main objective of this study is to investigate the effects of roughness due to fouling on the performance of a propeller using a CFD simulation in conjunction with the roughness function model. A simulation of a clean propeller is verified for a five-blade propeller model using existing experimental results. A roughness function model is then suggested based on existing measured roughness data. The simulations are extended for the same propeller under varying severities of roughness. Initially, it is concluded that KT and ηo gradually decrease with increasing fouling roughness, while KQ increases, compared to smooth propeller. For instance, at J=1.2 for medium calcareous fouling, KT is reduced by about 26%, KQ increases by about 7.0%, and ηo decreases by 30.9%. In addition, for the rough propeller, the extra power required is defined as the specific sea margin (SSM) to compensate for the power loss. A slight roughness causes a large decrease in ηo. A propeller painted with foul-release paint and an unpainted propeller are found to require 2.7% SSM and 57.8% SSM over four years of service, respectively. Finally, the use of foul-release paints for propeller painting is strongly advised.","PeriodicalId":49681,"journal":{"name":"Polish Maritime Research","volume":"261 3","pages":"61 - 73"},"PeriodicalIF":2.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139022093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantumness in Diagnostics of Marine Internal Combustion Engines and Other Ship Power Plant Machines 船用内燃机和其他船舶动力装置诊断中的量子化问题

IF 2 3区工程技术

Polish Maritime Research Pub Date : 2023-12-01 DOI: 10.2478/pomr-2023-0064

J. Girtler, Jacek Rudnicki

{"title":"Quantumness in Diagnostics of Marine Internal Combustion Engines and Other Ship Power Plant Machines","authors":"J. Girtler, Jacek Rudnicki","doi":"10.2478/pomr-2023-0064","DOIUrl":"https://doi.org/10.2478/pomr-2023-0064","url":null,"abstract":"Abstract The article provides proof that the diagnostics of marine internal combustion engines and other ship power plant machines should take into account the randomness and unpredictability of certain events, such as wear, damage, the variations of mechanical and thermal loads, etc., which take place during machine operation. In the article, the energy E, like the other forms (methods) that it can be converted into (heat and work), is considered the random variable Et; at time t, this variable has the mean value E¯t {bar E_t} , which is the observed value of the statistic E¯st {bar E_{st}} with an asymptotically normal distribution N(E(Et),σtn) Nleft( {Eleft( {{E_t}} right),{{{sigma _t}} over {sqrt n }}} right) , irrespective of the functional form of the random variable Et. A proof is given that shows that the expected value estimated in the above way, considering the time t of the performance of task Z by a marine internal combustion engine or other ship power plant machine, can be used to determine the machine’s possible action (DM). When compared to the required action (DW) needed for task Z to be performed, this possible action makes it possible to formulate an operating diagnosis concerning whether the engine or machine of concern is able to perform task Z. It is assumed that an energy device of this type is able to perform a given task when the inequality DM≥DW holds. Otherwise, when DM < DW, the device cannot perform the task for which it was adopted in the design and manufacturing phase, which means that it is in the incapability state, although it still can be started and convert energy into the form of heat or work..","PeriodicalId":49681,"journal":{"name":"Polish Maritime Research","volume":"24 ","pages":"110 - 119"},"PeriodicalIF":2.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139025598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimal UV Quantity for a Ballast Water Treatment System for Compliance with Imo Standards 符合伊莫标准的压载水处理系统的最佳紫外线用量

IF 2 3区工程技术

Polish Maritime Research Pub Date : 2023-12-01 DOI: 10.2478/pomr-2023-0056

Nguyen Dinh Thach, P. V. Hung

{"title":"Optimal UV Quantity for a Ballast Water Treatment System for Compliance with Imo Standards","authors":"Nguyen Dinh Thach, P. V. Hung","doi":"10.2478/pomr-2023-0056","DOIUrl":"https://doi.org/10.2478/pomr-2023-0056","url":null,"abstract":"Abstract Ballast water management is an effective measure to ensure that organisms, bacteria and viruses do not migrate with the ballast water to other areas. In 2004, the International Maritime Organization adopted the International Convention on the Control and Management of Ballast Water and Ship Sediments, which regulates issues related to ballast water management. Many technologies have been researched and developed, and of these, the use of UV rays in combination with filter membranes has been shown to have many advantages and to meet the requirements of the Convention. However, the use of UV furnaces in ballast water treatment systems requires a very large capacity, involving the use of many high-power UV lamps. This not only consumes large amounts of electrical energy, but is also expensive. It is therefore necessary to find an optimal algorithm to enable the UV radiation for the UV controller in the ballast water sterilisation process to be controlled in a reasonable and effective manner. This controller helps to prolong the life of the UV lamp, reduce power consumption and ensure effective sterilisation. This paper presents a UV control algorithm and a controller for a UV furnace for a ballast water treatment system installed on a ship. The results of tests on vessels illustrate the effect of the proposed UV controller.","PeriodicalId":49681,"journal":{"name":"Polish Maritime Research","volume":"191 ","pages":"31 - 42"},"PeriodicalIF":2.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139015428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Retrofitting the Bow of a General Cargo Vessel Andevaluating Energy Efficiency Operational Index 改造普通货船船首并评估能效运行指数

IF 2 3区工程技术

Polish Maritime Research Pub Date : 2023-12-01 DOI: 10.2478/pomr-2023-0054

Yordan Denev

引用次数: 0

Use of the AHP Method for Preference Determination in Yacht Design 在游艇设计中使用 AHP 方法确定偏好

IF 2 3区工程技术

Polish Maritime Research Pub Date : 2023-12-01 DOI: 10.2478/pomr-2023-0055

Jan Sierzputowski, A. Karczewski, Przemysław Krata

引用次数: 0

Exploration of a Model Thermoacoustic Turbogenerator with a Bidirectional Turbine 探索带双向涡轮的热声涡轮发电机模型

IF 2 3区工程技术

Polish Maritime Research Pub Date : 2023-12-01 DOI: 10.2478/pomr-2023-0063

V. Korobko, S. Serbin, Huu Cuong Le

{"title":"Exploration of a Model Thermoacoustic Turbogenerator with a Bidirectional Turbine","authors":"V. Korobko, S. Serbin, Huu Cuong Le","doi":"10.2478/pomr-2023-0063","DOIUrl":"https://doi.org/10.2478/pomr-2023-0063","url":null,"abstract":"Abstract The utilisation of the thermal emissions of modern ship power plants requires the development and implementation of essentially new methods of using low-temperature waste heat. Thermoacoustic technologies are able to effectively use low-temperature and cryogenic heat resources with a potential difference of 500–111 K. Thermoacoustic heat machines (TAHMs) are characterised by high reliability, simplicity and environmental safety. The wide implementation of thermoacoustic energy-saving systems is hampered by the low specific power and the difficulties of directly producing mechanical work. An efficient approach to converting acoustic energy into mechanical work entails the utilisation of axial pulse bidirectional turbines within thermoacoustic heat engines. These thermoacoustic turbogenerators represent comprehensive systems that consist of thermoacoustic primary movers with an electric generator actuated by an axial-pulse bidirectional turbine. The development of such a thermoacoustic turbogenerator requires several fundamental issues to be solved. For this purpose, a suitable experimental setup and a 3D computational fluid dynamics (CFD) model of a thermoacoustic engine (TAE) with bidirectional turbines were created. The research program involved conducting physical experiments and the CFD modelling of processes in a TAE resonator with an installed bidirectional turbine. The boundary and initial conditions for CFD calculations were based on empirical data. The adequacy of the developed numerical model was substantiated by the results of physical experiments. The CFD results showed that the most significant energy losses in bidirectional turbines are manifested in the output grid of the turbine.","PeriodicalId":49681,"journal":{"name":"Polish Maritime Research","volume":"45 36","pages":"102 - 109"},"PeriodicalIF":2.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138989063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Computer-Aided System for Layout of Fire Hydrants on Boards Designed Vessel Using the Particle Swarm Optimization Algorithm 利用粒子群优化算法设计船板上消防栓布局的计算机辅助系统

IF 2 3区工程技术

Polish Maritime Research Pub Date : 2023-12-01 DOI: 10.2478/pomr-2023-0053

Piotr Gomułka

{"title":"Computer-Aided System for Layout of Fire Hydrants on Boards Designed Vessel Using the Particle Swarm Optimization Algorithm","authors":"Piotr Gomułka","doi":"10.2478/pomr-2023-0053","DOIUrl":"https://doi.org/10.2478/pomr-2023-0053","url":null,"abstract":"Abstract The functional layout of fire safety equipment in technical spaces of ships is a time-consuming process. When designing a ship fire protection system, the designer must manually position each system component in such a way as to meet the requirements of regulations arising from the technical specification, various legal regulations of maritime conventions and classification societies of the vessel to be designed. Layout of fire hydrants assisted by a computer that is based on pre-defined criteria and various constraints could significantly support the designer in working easier and faster. This paper presents a prototype computer-aided design system that enables optimal placement of fire hydrants using the metaheuristic Particle Swarm Optimization (PSO) algorithm. This algorithm was used in Rhinoceros 3D software with its Grasshopper plugin for visualizing the arrangement of fire safety equipment. Various solution arrangements compared with the fire hydrant placement in real ships are illustrated by a case study. Demonstrating how design work can be facilitated and what potential benefits can be achieved are presented as well.","PeriodicalId":49681,"journal":{"name":"Polish Maritime Research","volume":"495 ","pages":"4 - 16"},"PeriodicalIF":2.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138992686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0