Liquefied natural gas is imposed as an acceptable transitional solution that enables compliance with legislative environmental requirements. Transportation of gas is provided both to gas pipelines and to ships that have recently been witnessed by an increase in order numbers globally. This kind of interest is accompanied by an increase in the number of loading and unloading terminals which, when selecting the site, must meet both technological and environmental requirements. Environmental impact studies are mandatory, and are also of great interest to the local population. Due to the planned location of the terminal for regasification of natural gas in the Rijeka Bay, this paper analyzes the most common adverse effects on the environment and local residents as well as the possibility of reducing its negative impacts, with special reference to the use of cryogenic energy in endothermic and exothermic technological processes and economic activities. At the same time, it can be shown that it is possible to reduce its adverse effects and produce useful energy, or products which may have significance in changing the perception of the local community.
{"title":"Analysis of Opportunities to Reduce Environmental Impacts from the Natural Gas Regasification Terminal","authors":"Radoslav Radonja, Bruno Reljac, Vladimir Pelić","doi":"10.18048/2020.00.05","DOIUrl":"https://doi.org/10.18048/2020.00.05","url":null,"abstract":"Liquefied natural gas is imposed as an acceptable transitional solution that enables compliance with legislative environmental requirements. Transportation of gas is provided both to gas pipelines and to ships that have recently been witnessed by an increase in order numbers globally. This kind of interest is accompanied by an increase in the number of loading and unloading terminals which, when selecting the site, must meet both technological and environmental requirements. Environmental impact studies are mandatory, and are also of great interest to the local population. Due to the planned location of the terminal for regasification of natural gas in the Rijeka Bay, this paper analyzes the most common adverse effects on the environment and local residents as well as the possibility of reducing its negative impacts, with special reference to the use of cryogenic energy in endothermic and exothermic technological processes and economic activities. At the same time, it can be shown that it is possible to reduce its adverse effects and produce useful energy, or products which may have significance in changing the perception of the local community.","PeriodicalId":366194,"journal":{"name":"Journal of Maritime & Transportation Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125639679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In view of the growing international trade in Sub Saharan Africa, and very few studies done on the determinants of port choice from the Sub Saharan African port users perspective, this paper proves that efficiency is one of the critical determinants of port selection. Efficiency is a critical transportation parameter. The kernel of the paper is to examine port choice indicators and critical transportation parameters as a basis for port selection. Fifty-one business representative from Sub Saharan African countries responded to the questionnaire to indicate what they consider as critical in their importation and exportation of shipment via ports in Sub Saharan Africa. The paper established that critical transportation parameters and key port indicators are determinants in the choice of ports.
{"title":"An Examination of Port Choice Indicators and Critical Transportation Parameters as a Basis for Port Selection","authors":"O. Osundiran, F. Okonta, H. Quainoo","doi":"10.18048/2020.58.01","DOIUrl":"https://doi.org/10.18048/2020.58.01","url":null,"abstract":"In view of the growing international trade in Sub Saharan Africa, and very few studies done on the determinants of port choice from the Sub Saharan African port users perspective, this paper proves that efficiency is one of the critical determinants of port selection. Efficiency is a critical transportation parameter. The kernel of the paper is to examine port choice indicators and critical transportation parameters as a basis for port selection. Fifty-one business representative from Sub Saharan African countries responded to the questionnaire to indicate what they consider as critical in their importation and exportation of shipment via ports in Sub Saharan Africa. The paper established that critical transportation parameters and key port indicators are determinants in the choice of ports.","PeriodicalId":366194,"journal":{"name":"Journal of Maritime & Transportation Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120867604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Aleksandar Žic, Barbara Pongracic, Serđo Kos, David Brčić
Prediction of satellite positioning errors represents a substantial step towards the Global Navigation Satellite System (GNSS) performance assessment. Satellite positioning accuracy in the particular area can be expected to be similar due to prevailing environmental conditions. This similarity opens the opportunity to estimate and predict the positioning errors of close locations. The paper aims to develop a regional model of positioning errors estimation for Global Positioning System (GPS) single-frequency receivers based on ground truth data from reference stations, in this phase considering different levels of space weather activity as one f the criteria defining environmental conditions. The model should provide a simple positioning error prediction in cases where reference stations and respective data do not exist. The space weather conditions were examined to determine the influence on GPS satellite positioning performance at three selected International GNSS Service (IGS) stations in the Adriatic Region - Graz, Padua, and Matera. The mutual relations in terms of positioning error patterns were elaborated. The same 15-day period in three consecutive years was analysed. Pearson’s coefficient was utilised as a major indicator for determining the degree of correlation. The data from IGS stations Padua and Graz showed better, significant correlation results. The IGS station Matera, located farther and southward slightly differed in positioning deviations’ patterns and was not used for the model development. Satellite positioning errors of IGS Padua were used as a reference to determine the positioning errors of IGS Graz. Due to the significant correlation results, the linear regression model has been developed for the latitude, longitude, and height positioning errors. The final model coefficients were calculated as average values of the model coefficients for latitude, longitude, and height errors for elaborated periods. The cross-validation with five folds has been carried out, showing good model performance with R2 values of 0.7785 for geographic latitude, 0.8132 for the geographic longitude, and 0.7796 for height above sea level, respectively. The validation showed that the model could be applied during all levels of space weather activity on a regional basis.
{"title":"On GPS L1 Positioning Errors’ Estimation in the Adriatic Region","authors":"Aleksandar Žic, Barbara Pongracic, Serđo Kos, David Brčić","doi":"10.18048/2020.58.11","DOIUrl":"https://doi.org/10.18048/2020.58.11","url":null,"abstract":"Prediction of satellite positioning errors represents a substantial step towards the Global Navigation Satellite System (GNSS) performance assessment. Satellite positioning accuracy in the particular area can be expected to be similar due to prevailing environmental conditions. This similarity opens the opportunity to estimate and predict the positioning errors of close locations. The paper aims to develop a regional model of positioning errors estimation for Global Positioning System (GPS) single-frequency receivers based on ground truth data from reference stations, in this phase considering different levels of space weather activity as one f the criteria defining environmental conditions. The model should provide a simple positioning error prediction in cases where reference stations and respective data do not exist. The space weather conditions were examined to determine the influence on GPS satellite positioning performance at three selected International GNSS Service (IGS) stations in the Adriatic Region - Graz, Padua, and Matera. The mutual relations in terms of positioning error patterns were elaborated. The same 15-day period in three consecutive years was analysed. Pearson’s coefficient was utilised as a major indicator for determining the degree of correlation. The data from IGS stations Padua and Graz showed better, significant correlation results. The IGS station Matera, located farther and southward slightly differed in positioning deviations’ patterns and was not used for the model development. Satellite positioning errors of IGS Padua were used as a reference to determine the positioning errors of IGS Graz. Due to the significant correlation results, the linear regression model has been developed for the latitude, longitude, and height positioning errors. The final model coefficients were calculated as average values of the model coefficients for latitude, longitude, and height errors for elaborated periods. The cross-validation with five folds has been carried out, showing good model performance with R2 values of 0.7785 for geographic latitude, 0.8132 for the geographic longitude, and 0.7796 for height above sea level, respectively. The validation showed that the model could be applied during all levels of space weather activity on a regional basis.","PeriodicalId":366194,"journal":{"name":"Journal of Maritime & Transportation Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128678135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sandi Baressi Segota, D. Štifanić, K. Ohkura, Z. Car
An artificial neural network (ANN) approach is proposed to the problem of estimating the propeller torques of a frigate using combined diesel, electric and gas (CODLAG) propulsion system. The authors use a multilayer perceptron (MLP) feed-forward ANN trained with data from a dataset which describes the decay state coefficients as outputs and system parameters as inputs – with a goal of determining the propeller torques, removing the decay state coefficients and using the torque values of the starboard and port propellers as outputs. A total of 53760 ANNs are trained – 26880 for each of the propellers, with a total 8960 parameter combinations. The results are evaluated using mean absolute error (MAE) and coefficient of determination (R2). Best results for the starboard propeller are MAE of 2.68 [Nm], and MAE of 2.58 [Nm] for the port propeller with following ANN configurations respectively: 2 hidden layers with 32 neurons and identity activation and 3 hidden layers with 16, 32 and 16 neurons and identity activation function. Both configurations achieve R2 value higher than 0.99.
{"title":"Use of Artificial Neural Network for Estimation of Propeller Torque Values in a CODLAG Propulsion System","authors":"Sandi Baressi Segota, D. Štifanić, K. Ohkura, Z. Car","doi":"10.18048/2020.58.02","DOIUrl":"https://doi.org/10.18048/2020.58.02","url":null,"abstract":"An artificial neural network (ANN) approach is proposed to the problem of estimating the propeller torques of a frigate using combined diesel, electric and gas (CODLAG) propulsion system. The authors use a multilayer perceptron (MLP) feed-forward ANN trained with data from a dataset which describes the decay state coefficients as outputs and system parameters as inputs – with a goal of determining the propeller torques, removing the decay state coefficients and using the torque values of the starboard and port propellers as outputs. A total of 53760 ANNs are trained – 26880 for each of the propellers, with a total 8960 parameter combinations. The results are evaluated using mean absolute error (MAE) and coefficient of determination (R2). Best results for the starboard propeller are MAE of 2.68 [Nm], and MAE of 2.58 [Nm] for the port propeller with following ANN configurations respectively: 2 hidden layers with 32 neurons and identity activation and 3 hidden layers with 16, 32 and 16 neurons and identity activation function. Both configurations achieve R2 value higher than 0.99.","PeriodicalId":366194,"journal":{"name":"Journal of Maritime & Transportation Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126097394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The paper presents an analysis of the basic parameters of Ro-Pax ships and double-ended ferries. The study was carried out within the framework of the project METRO (Maritime Environment-friendly TRanspOrt systems), funded from 2014-2020 Interreg V-A Italy-Croatia CBC Programme. The aim of the project is an improvement of the environmental sustainability in the field of maritime transport, with particular emphasis on multimodality and “green” solutions for the coastal transport. The specific focus is on touristic connections in the North Adriatic area. One of the project goals is a development of short-medium range hybrid ships and of concern are Ro-Pax ships and double-ended ferries, which are the most common ship types for coastal shipping in the Adriatic area. Two extensive databases were created encompassing a large number of ferries that operate in Europe, by one for each ship type. The databases will serve as basis for the preliminary design of the new hybrid Ro-Pax ship and double-ended ferry.
{"title":"An Analysis of Basic Parameters of Ro-Pax Ships and Double-ended Ferries as Basis for New Hybrid Ferries Designs","authors":"L. Novak, Darin Majnarić, R. Dejhalla, A. Zamarin","doi":"10.18048/2020.00.02","DOIUrl":"https://doi.org/10.18048/2020.00.02","url":null,"abstract":"The paper presents an analysis of the basic parameters of Ro-Pax ships and double-ended ferries. The study was carried out within the framework of the project METRO (Maritime Environment-friendly TRanspOrt systems), funded from 2014-2020 Interreg V-A Italy-Croatia CBC Programme. The aim of the project is an improvement of the environmental sustainability in the field of maritime transport, with particular emphasis on multimodality and “green” solutions for the coastal transport. The specific focus is on touristic connections in the North Adriatic area. One of the project goals is a development of short-medium range hybrid ships and of concern are Ro-Pax ships and double-ended ferries, which are the most common ship types for coastal shipping in the Adriatic area. Two extensive databases were created encompassing a large number of ferries that operate in Europe, by one for each ship type. The databases will serve as basis for the preliminary design of the new hybrid Ro-Pax ship and double-ended ferry.","PeriodicalId":366194,"journal":{"name":"Journal of Maritime & Transportation Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133868040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The paper described the essence of evaluating port efficiency using the Data Envelopment Analysis Malmquist Production Index Model. The model was used to examine the drivers of efficiency of 19 Sub-Saharan African Ports for the period of 2008-2015. The importance of ports to the development of nations in Africa makes it expedient to evaluate how efficient ports in sub-Saharan Africa are and what are the drivers of efficiency. The result of the study indicated that the significant drivers of productivity in the ports examined are technical efficiency. A Port continuous improvement framework was developed to assist in improving port performance. The Port continuous improvement framework is essential because the improvement in the port will have a multiplier effect on all the maritime stakeholders and the economy at large.
{"title":"The Criticality of Evaluating Port Efficiency Modelling: A Case of 19 Sub Saharan African Ports for the period of 2008-2015","authors":"O. Osundiran, F. Okonta, H. Quainoo","doi":"10.18048/2020.58.09","DOIUrl":"https://doi.org/10.18048/2020.58.09","url":null,"abstract":"The paper described the essence of evaluating port efficiency using the Data Envelopment Analysis Malmquist Production Index Model. The model was used to examine the drivers of efficiency of 19 Sub-Saharan African Ports for the period of 2008-2015. The importance of ports to the development of nations in Africa makes it expedient to evaluate how efficient ports in sub-Saharan Africa are and what are the drivers of efficiency. The result of the study indicated that the significant drivers of productivity in the ports examined are technical efficiency. A Port continuous improvement framework was developed to assist in improving port performance. The Port continuous improvement framework is essential because the improvement in the port will have a multiplier effect on all the maritime stakeholders and the economy at large.","PeriodicalId":366194,"journal":{"name":"Journal of Maritime & Transportation Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124878470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Corrosion of reinforcement is one of basic destruction mechanisms of reinforced concrete structures. In that sense, the most affected structures are those by the sea, especially their parts subjected to cycles of wetting and drying. Chlorides penetrate to concrete mostly by diffusion, faster if the concrete is more permeable, destructing reinforcement passive protection and causing its corrosion, reduction of reinforcement cross section and bearing capacity of the structure. Retardation of chloride corrosion that causes structure degradation in marine environment can be achieved by the usage of quality concrete with enhanced strength and permeability parameters in regards to ordinary concrete. Mixes of ordinary and high performance concrete with different ratio of silica fume have been made. Compressive strength and resistivity to chloride penetration have been tested on the specimens 28 days after mixing. The resistivity to chloride penetration has been determined by fast chloride penetration test according to ASTM C1202 standard, using appliance that measures electrical conductivity of concrete specimens. Based on test results, the suitability of building reinforced concrete structures by the sea using high performance concrete has been analysed.
{"title":"Analysis of Chloride Penetration Into High Performance Concrete","authors":"S. Mrakovčić, N. Bede, Ivan Ušić","doi":"10.18048/2020.00.22","DOIUrl":"https://doi.org/10.18048/2020.00.22","url":null,"abstract":"Corrosion of reinforcement is one of basic destruction mechanisms of reinforced concrete structures. In that sense, the most affected structures are those by the sea, especially their parts subjected to cycles of wetting and drying. Chlorides penetrate to concrete mostly by diffusion, faster if the concrete is more permeable, destructing reinforcement passive protection and causing its corrosion, reduction of reinforcement cross section and bearing capacity of the structure. Retardation of chloride corrosion that causes structure degradation in marine environment can be achieved by the usage of quality concrete with enhanced strength and permeability parameters in regards to ordinary concrete. Mixes of ordinary and high performance concrete with different ratio of silica fume have been made. Compressive strength and resistivity to chloride penetration have been tested on the specimens 28 days after mixing. The resistivity to chloride penetration has been determined by fast chloride penetration test according to ASTM C1202 standard, using appliance that measures electrical conductivity of concrete specimens. Based on test results, the suitability of building reinforced concrete structures by the sea using high performance concrete has been analysed.","PeriodicalId":366194,"journal":{"name":"Journal of Maritime & Transportation Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121540430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An analysis of drinking water supply to the Croatian islands indicates an unsatisfactory situation with drinking water on inhabited and occasionally inhabited islands, as well as frequent shortages of drinking water. Besides the fact that this constitutes an obstacle to the economic development of the islands, the scarcity of drinking water further complicates the everyday life of islanders, especially during the summer months when scarcities are more frequent. A particular problem has been observed on islands where the drinking water is supplied by drinking-water carriers. There are four such ships in Croatia, with an average age of over sixty years, which often fail to meet the island’s drinking water demands on time and in sufficient quantity. For strategic reasons, the renovation and strengthening of the Croatian fleet of drinking-water carriers should be definitely considered in order to ensure a secure long-term supply of drinking water to the islands. In the paper a preliminary design of a drinking-water carrier suitable to supply water to the Croatian islands is presented.
{"title":"Preliminary Design of a Drinking-water Carrier for Water Supply to the Croatian Islands","authors":"L. Novak, R. Dejhalla","doi":"10.18048/2020.00.04","DOIUrl":"https://doi.org/10.18048/2020.00.04","url":null,"abstract":"An analysis of drinking water supply to the Croatian islands indicates an unsatisfactory situation with drinking water on inhabited and occasionally inhabited islands, as well as frequent shortages of drinking water. Besides the fact that this constitutes an obstacle to the economic development of the islands, the scarcity of drinking water further complicates the everyday life of islanders, especially during the summer months when scarcities are more frequent. A particular problem has been observed on islands where the drinking water is supplied by drinking-water carriers. There are four such ships in Croatia, with an average age of over sixty years, which often fail to meet the island’s drinking water demands on time and in sufficient quantity. For strategic reasons, the renovation and strengthening of the Croatian fleet of drinking-water carriers should be definitely considered in order to ensure a secure long-term supply of drinking water to the islands. In the paper a preliminary design of a drinking-water carrier suitable to supply water to the Croatian islands is presented.","PeriodicalId":366194,"journal":{"name":"Journal of Maritime & Transportation Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126305622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
L. Grbčić, L. Kranjčević, Ivan Filiplić, Kristijan Mavrić
In this paper, a model of water flow in the Porto Baroš has been developed, which is the part of the Rijeka coastal area, for the purpose of its renovation and conversion. For numerical simulation purposes, the depth of the seabed of Port was previously performed, based on which the geometry and numerical domain of Port were made. By conducting the flow simulation, the analysis was carried out, after which the analyses of the conceptual solutions with the introduction of the pipe discharge were performed with the aim of reducing the water pollution of the Porto Baroš area. Port geometry will be made in commercial SMS software and numerical domains and simulations in OpenFOAM open-source software.
{"title":"Numerical Simulation of River Inflows in Rijeka Bay Coastal Area","authors":"L. Grbčić, L. Kranjčević, Ivan Filiplić, Kristijan Mavrić","doi":"10.18048/2020.00.08","DOIUrl":"https://doi.org/10.18048/2020.00.08","url":null,"abstract":"In this paper, a model of water flow in the Porto Baroš has been developed, which is the part of the Rijeka coastal area, for the purpose of its renovation and conversion. For numerical simulation purposes, the depth of the seabed of Port was previously performed, based on which the geometry and numerical domain of Port were made. By conducting the flow simulation, the analysis was carried out, after which the analyses of the conceptual solutions with the introduction of the pipe discharge were performed with the aim of reducing the water pollution of the Porto Baroš area. Port geometry will be made in commercial SMS software and numerical domains and simulations in OpenFOAM open-source software.","PeriodicalId":366194,"journal":{"name":"Journal of Maritime & Transportation Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128582104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Vladimir Pelić, T. Mrakovčić, O. Bukovac, M. Valčić
Increasing demands on energy efficiency and environmental acceptance are being imposed on marine propulsion plants. The fulfilment of the conditions set by the MARPOL Convention, Annex VI, regarding the emissions from exhaust gases of marine diesel engines is of particular interest. This paper presents the development and validation of a zero-dimensional, single-zone diesel engine numerical model. Presented numerical model is based on the law of conservation of energy and mass and solving the resulting differential equations. The single-zone model will serve as the basis for a model where the cylinder space is divided into two or three zones during combustion. In this way, the multi-zone model will allow the modelling of nitrogen oxide emissions with satisfactory accuracy. Validation of the diesel engine model was carried out for the Wärtsilä 12V50DF 11700 kW motor designed to drive a synchronous alternator. Obtained results and deviations of certain parameters in the operation of the engine with respect to the data obtained from the measurements on the test bed, are more than satisfactory regarding complexity of the numerical model. This confirmed the usability of the model for research purposes to optimize the marine diesel engine.
{"title":"Development and Validation of 4 Stroke Marine Diesel Engine Numerical Model","authors":"Vladimir Pelić, T. Mrakovčić, O. Bukovac, M. Valčić","doi":"10.18048/2020.00.27","DOIUrl":"https://doi.org/10.18048/2020.00.27","url":null,"abstract":"Increasing demands on energy efficiency and environmental acceptance are being imposed on marine propulsion plants. The fulfilment of the conditions set by the MARPOL Convention, Annex VI, regarding the emissions from exhaust gases of marine diesel engines is of particular interest. This paper presents the development and validation of a zero-dimensional, single-zone diesel engine numerical model. Presented numerical model is based on the law of conservation of energy and mass and solving the resulting differential equations. The single-zone model will serve as the basis for a model where the cylinder space is divided into two or three zones during combustion. In this way, the multi-zone model will allow the modelling of nitrogen oxide emissions with satisfactory accuracy. Validation of the diesel engine model was carried out for the Wärtsilä 12V50DF 11700 kW motor designed to drive a synchronous alternator. Obtained results and deviations of certain parameters in the operation of the engine with respect to the data obtained from the measurements on the test bed, are more than satisfactory regarding complexity of the numerical model. This confirmed the usability of the model for research purposes to optimize the marine diesel engine.","PeriodicalId":366194,"journal":{"name":"Journal of Maritime & Transportation Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132680449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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