TY - JOUR AU - Zalacko, Roland AU - Zöldy, Máté AU - Simongáti, Győző TI - COMPARISON OF ALTERNATIVE PROPULSION SYSTEMS - A CASE STUDY OF A PASSENGER SHIP USED IN PUBLIC TRANSPORT JF - BRODOGRADNJA J2 - BRODOGRADNJA VL - 72 PY - 2021 IS - 2 SP - 1 EP - 18 PG - 18 SN - 0007-215X DO - 10.21278/brod72201 UR - https://m2.mtmt.hu/api/publication/32405407 ID - 32405407 N1 - Dept. of Aeronautics, Naval Architecture and Railway Vehicles, Budapest University of Technology and Economics, Budapest, Hungary Dept. of Automotive Technologies, Budapest University of Technology and Economics, Budapest, Hungary Export Date: 16 June 2022 Correspondence Address: Máté, Z.; Dept. of Automotive Technologies, Hungary; email: mate.zoldy@auto.bme.hu AB - 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. LA - English DB - MTMT ER - TY - JOUR AU - Zalacko, Roland AU - Zöldy, Máté AU - Simongáti, Győző TI - Feasibility study of using alternative propulsuion systems in public transport on an inland ship JF - BRODOGRADNJA J2 - BRODOGRADNJA VL - 2021 PY - 2021 IS - 4 SN - 0007-215X UR - https://m2.mtmt.hu/api/publication/32032037 ID - 32032037 LA - English DB - MTMT ER - TY - JOUR AU - Zalacko, Roland AU - Zöldy, Máté AU - Simongáti, Győző TI - Alternatív tüzelőanyagok alkalmazhatósága a hajózásban és tüzelőanyag-fogyasztás számítási módszerek JF - KÖZLEKEDÉSTUDOMÁNYI SZEMLE J2 - KÖZLEKEDÉSTUDOMÁNYI SZEMLE VL - 70 PY - 2020 IS - 4 SP - 53 EP - 61 PG - 10 SN - 0023-4362 DO - 10.24228/KTSZ.2020.4.5 UR - https://m2.mtmt.hu/api/publication/31394647 ID - 31394647 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Zalacko, Roland AU - Zöldy, Máté AU - Simongáti, Győző TI - COMPARATIVE STUDY OF TWO SIMPLE MARINE ENGINE BSFC ESTIMATION METHODS JF - BRODOGRADNJA J2 - BRODOGRADNJA VL - 71 PY - 2020 IS - 3 SP - 13 EP - 25 PG - 13 SN - 0007-215X DO - 10.21278/brod71302 UR - https://m2.mtmt.hu/api/publication/31388066 ID - 31388066 N1 - Dept. of Aeronautics, Naval Architecture and Railway Vehicles Budapest University of Technology and Economics, Budapest, Hungary Dept. of Automotive Technologies Budapest University of Technology and Economics, Budapest, Hungary Cited By :4 Export Date: 1 September 2022 Correspondence Address: Zöldy, M.; Dept. of Automotive Technologies Budapest University of Technology and EconomicsHungary; email: mate.zoldy@auto.bme.hu LA - English DB - MTMT ER - TY - CHAP AU - Simongáti, Győző AU - Hargitai, László Csaba AU - Zalacko, Roland ED - Zobory, István TI - Operational profile of inland public transport vessels T2 - Proceedings of the 16th MINI Conference on Vehicle System Dynamics, Identification and Anomalies, VSDIA 2018 PB - Budapest University of Technology and Economics CY - Budapest SN - 9789633133156 PY - 2019 SP - 381 EP - 392 PG - 12 UR - https://m2.mtmt.hu/api/publication/31844007 ID - 31844007 N1 - BME Faculty of Transportation and Vehicle Engineering; BME Intelligent Transportation and Vehicle Systems Co. (ITS ZRt.); et al.; Knorr Bremse Brake R and D Institute Budapest; Knorr Bremse Brake Systems Ltd.; Knorr-Bremse Railway Vehicle Systems Hungaria Ltd. Conference code: 157415 Export Date: 2 February 2021 Scopus:hiba:85079434476 2022-10-12 15:56 típus nem egyezik AB - 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. LA - English DB - MTMT ER -