@article{MTMT:32405407,
	title = {COMPARISON OF ALTERNATIVE PROPULSION SYSTEMS - A CASE STUDY OF A PASSENGER SHIP USED IN PUBLIC TRANSPORT},
	url = {https://m2.mtmt.hu/api/publication/32405407},
	author = {Zalacko, Roland and Zöldy, Máté and Simongáti, Győző},
	doi = {10.21278/brod72201},
	journal-iso = {BRODOGRADNJA},
	journal = {BRODOGRADNJA},
	volume = {72},
	unique-id = {32405407},
	issn = {0007-215X},
	abstract = {The unique feature of river transport is given by the rivers' flow and the changing cross-sections of the riverbed. Most river vessels operate with a conventional propulsion system. Engine power should be scaled to the maximum expected power demand, which means that the engine is forced to run at medium or low load, almost always downstream and upstream for part of the operating time. In these cases, the engine's operating point is far from ideal, so there is an increase in specific fuel consumption. This is especially true for ships that are forced to stop and start frequently. An example for the circumstances mentioned above is the BKV-100 type ship operated at Budapest as a public transport vessel. A measurement on a schedule route revealed that with given environmental conditions (water level, river flow rate, etc.), the power installed in the vessel is almost double the maximum power demand measured. Due to this reason and to the differences in power demand of downstream and upstream, it may be technically worthwhile to replace the existing conventional propulsion system with an alternative propulsion system. Based on the measurements, in this paper the authors compare 4 alternative drive systems to the existing one with regards to fuel consumption and the investment costs. Beside this, a simple but effective fuel consumption estimation method and a simple cost-benefit analysis are also described.},
	keywords = {Operational profile; alternative propulsion system; inland navigation; cost and fuel consumption estimation},
	year = {2021},
	eissn = {1845-5859},
	pages = {1-18},
	orcid-numbers = {Zöldy, Máté/0000-0003-1271-840X}
}

@article{MTMT:32032037,
	title = {Feasibility study of using alternative propulsuion systems in public transport on an inland ship},
	url = {https://m2.mtmt.hu/api/publication/32032037},
	author = {Zalacko, Roland and Zöldy, Máté and Simongáti, Győző},
	journal-iso = {BRODOGRADNJA},
	journal = {BRODOGRADNJA},
	volume = {2021},
	unique-id = {32032037},
	issn = {0007-215X},
	year = {2021},
	eissn = {1845-5859}
}

@article{MTMT:31394647,
	title = {Alternatív tüzelőanyagok alkalmazhatósága a hajózásban és tüzelőanyag-fogyasztás számítási módszerek},
	url = {https://m2.mtmt.hu/api/publication/31394647},
	author = {Zalacko, Roland and Zöldy, Máté and Simongáti, Győző},
	doi = {10.24228/KTSZ.2020.4.5},
	journal-iso = {KÖZLEKEDÉSTUDOMÁNYI SZEMLE},
	journal = {KÖZLEKEDÉSTUDOMÁNYI SZEMLE},
	volume = {70},
	unique-id = {31394647},
	issn = {0023-4362},
	year = {2020},
	pages = {53-61},
	orcid-numbers = {Zöldy, Máté/0000-0003-1271-840X}
}

@article{MTMT:31388066,
	title = {COMPARATIVE STUDY OF TWO SIMPLE MARINE ENGINE BSFC ESTIMATION METHODS},
	url = {https://m2.mtmt.hu/api/publication/31388066},
	author = {Zalacko, Roland and Zöldy, Máté and Simongáti, Győző},
	doi = {10.21278/brod71302},
	journal-iso = {BRODOGRADNJA},
	journal = {BRODOGRADNJA},
	volume = {71},
	unique-id = {31388066},
	issn = {0007-215X},
	year = {2020},
	eissn = {1845-5859},
	pages = {13-25},
	orcid-numbers = {Zöldy, Máté/0000-0003-1271-840X}
}

@inproceedings{MTMT:31844007,
	title = {Operational profile of inland public transport vessels},
	url = {https://m2.mtmt.hu/api/publication/31844007},
	author = {Simongáti, Győző and Hargitai, László Csaba and Zalacko, Roland},
	booktitle = {Proceedings of the 16th MINI Conference on Vehicle System Dynamics, Identification and Anomalies, VSDIA 2018},
	unique-id = {31844007},
	abstract = {Unlike seagoing merchant ships, the inland vessels operate in a wide range of propulsion power, while sailing on rivers longitudinally. Therefore, utilization of main engines are mostly partial. Because the engines run under the nominal power, both the brake specific fuel consumption (BSFC) and the total consumption can be higher than in nominal power operation, and an increase in the emissions can be expected also. The not-conventional ship propulsion systems (e.g. diesel-electric, hybrid, etc.) are getting cheaper hence they raise the possibility of economic feasibility. Selecting a ship propulsion system is a multi-criteria decision making process, which have to be supported from engineering side with operational analysis of different propulsion systems. The starting point of this analysis must be the expected or validated data based operational profile of the vessel. This article introduces the meaning of operational profile and how it can be described. The authors present an example about propulsion power utilization measurement of an inland public transport vessel. Based on the measured data the paper shows how the operational profile is defined. The article introduces the possible criteria of a multi-criterial decision making process for an optimal propulsion system design. The possible non-conventional ship propulsion systems are also introduced, and the interpretation of these for the example inland public transport vessel is presented as conclusion. © 2019 Budapest University of Technology and Economics. All rights reserved.},
	keywords = {decision making; Ships; Engines; public transport; System theory; Sailing vessels; Economic feasibilities; Multi criteria decision making; Brake specific fuel consumption; Inland waterway vessel; Propulsion system; Propulsion system; Public transport vessel; Multi-criterial decision making; Operational profile; Operational profile; Ship propulsion system; Ship propulsion},
	year = {2019},
	pages = {381-392}
}