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Journal articles on the topic 'Propulsão alternativa'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Gheno, Simoni Maria, Rui Sérgio Mendes De Oliveira Junior, Felipe do Nascimento Gonçalves, Danilo dos Santos Barbosa, and Maria Aparecida Bovério. "MICROTURBINA A GÁS APLICADA COMO FONTE ALTERNATIVA DE ENERGIA EM REGIÕES COM DEFICIÊNCIA ENERGÉTICA." SITEFA - Simpósio de Tecnologia da Fatec Sertãozinho 2, no. 1 (December 19, 2019): 95–107. http://dx.doi.org/10.33635/sitefa.v2i1.54.

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Com o crescimento da demanda energética prevista a médio e longo prazos e inúmeras falhas no sistema de distribuição de energia elétrica no Brasil, surgem novas tecnologias versáteis e eficazes para atenderem tal responsabilidade. O objetivo deste trabalho foi desenvolver e construir uma microturbina a gás para a propulsão de um microgerador de energia elétrica. A utilização de microturbinas a gás é extremamente vantajosa, pois permite atingir a carga plena de trabalho em pouco tempo. O projeto da microturbina a gás foi desenvolvido baseado em cálculos termodinâmicos e estequiométricos, sendo dimensionados a partir deles, os componentes da microturbina no software SolidWorks. Como resultados, apresentaram-se eficiência na combustão dos gases de 97%, contudo, sua eficiência térmica do ciclo termodinâmico foi de 8,1% devido à necessidade de se manter uma temperatura relativamente baixa para não danificar as peças internas da turbina. Conclui-se que a microturbina se apresentou como uma ótima alternativa para atender empresas que necessitam de um fornecimento de energia ininterrupto e regiões de difícil acesso.

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Batista, Flabio Alberto Bardemaker, Humberto Reder Cazangi, Alexsandro Gehlen, Arturo Manzoli, Bruno Eduardo Ferreira, Bruno Possamai Della Tomasi, Gabriel Nascimento Garcez, et al. "EMBARCAÇÃO SOLAR DE PEQUENO PORTE COMO OBJETO DE PESQUISA PARA O DESENVOLVIMENTO E DIVULGAÇÃO DO USO DE TECNOLOGIAS ASSOCIADAS À ENERGIAS LIMPAS." Revista Gestão & Sustentabilidade Ambiental 4 (December 16, 2015): 411. http://dx.doi.org/10.19177/rgsa.v4e02015411-430.

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Como proposta alternativa à veículos que popularmente utilizam motores a combustão de baixa eficiência e elevado impacto ambiental, este projeto busca estudar e desenvolver cada um dos componentes necessários para a construção de uma embarcação energeticamente eficiente, a fim de substituir a queima de combustíveis fósseis pela captação de energia solar por painéis fotovoltaicos. Abrangendo estudos em diversas subáreas da mecânica e elétrica, o barco solar de pequeno porte brevemente descrito neste artigo é desenvolvido para utilização em ralis nos quais toda a energia disponível para a propulsão dos veículos é proveniente da luz do sol. Buscando demonstrar a aplicabilidade dos veículos solares e promover o uso de tecnologias mais sustentáveis que primam pela eficiência energética, é apresentado o funcionamento de cada parte da embarcação, contendo a descrição dos principais dispositivos necessários para o controle, monitoração e segurança deste tipo de embarcação.

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Dos Reis, Silvio Rodrigo, and Elaine Aparecida Da Silva. "Motores Elétricos Flex a Etanol: uma nova Era no Setor Automotivo Mundial." Revista de Ciências Exatas e Tecnologia 12, no. 12 (February 22, 2018): 45. http://dx.doi.org/10.17921/1890-1793.2017v12n12p45-48.

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O conceito de motores elétricos está inserido na sociedade desde meados do século XIX. O advento do petróleo e a maior eficiência do motor a combustão interna a gasolina fez com que o desenvolvimento dos elétricos permanecesse adormecido por várias décadas. Ressurgiu este conceito após a conscientização mundial sobre problemas de poluição ambiental, que os motores a combustão, movidos com petróleo e derivados trouxeram ao longo dos anos, originando a introdução de políticas de desenvolvimento sustentável, que visa eliminar a circulação de veículos com motores a combustão interna pelos países europeus nos próximos anos. Fontes alternativas de energia, como o etanol, auxilia na propulsão do motor elétrico, cuja eficiência fica comprometida em longas distâncias e em veículos de médio e grande porte. O motor elétrico híbrido flex a etanol é uma alternativa eficaz para atender aos padrões atuais de consumo, já que há muito tempo se tem o motor a combustão interna a etanol eficiente, bem como auxiliar a falta de oferta de uma ampla rede de reabastecimento de baterias elétricas, possibilitando que o consumidor possa realizar suas atividades diárias sem a preocupação com a falta de disponibilidade de eletropostos em algumas cidades do território nacional.Palavras-chave: Motor. Elétrico. Etanol. Automóveis. Híbrido.AbstractThe electric motors concept has been inserted in the society since the mid-nineteenth century. The oil advent and the internal gasoline-fueled engine increased efficiency meant that the electric cars development had remained dormant for several decades. This concept emerged after global awareness of the environmental pollution problems caused by oil-derived combustion engines, which led to the introduction of sustainable development policies to eliminate the vehicles circulation with internal combustion engines by European countries in the next years. Alternative energy sources, such as ethanol, help propel the electric motor, whose efficiency is compromised over long distances and in medium and large vehicles. The ethanol-flex hybrid electric motor is an effective alternative to meet current consumption standards, since the engine has long been the fuel-efficient domestic ethanol, as well as adi the lack of supply of a wide network of battery replenishment making it possible for the consumer to carry out his or her daily activities without worrying about the lack of electricity availability in some cities of the national territory.Keywords: Motor. Electric. Ethanol. Automobiles. Hybrid.

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4

Ackerman, Brian M. "Modular Gas Turbine Propulsors: A Viable Alternative for Today’s Merchant Fleet." Marine Technology and SNAME News 40, no. 02 (April 1, 2003): 106–25. http://dx.doi.org/10.5957/mt1.2003.40.2.106.

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Gas turbines offer the commercial shipping industry the best power to volume ratio available for a propulsion package. When coupled with a podded propulsor, gas turbines can be placed in a module anywhere on the vessel, allowing optimal use of vessel space for cargo. As the shipping market continues to evolve, modular gas turbines seem to be the logical choice for future vessels. The object of this paper is to demonstrate the substantial increase in profits associated with a modular gas turbine propulsion package.

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5

Grzesiak, Szymon. "Alternative Propulsion Plants for Modern LNG Carriers." New Trends in Production Engineering 1, no. 1 (October 1, 2018): 399–407. http://dx.doi.org/10.2478/ntpe-2018-0050.

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Abstract This paper shows the latest evolution trends of propulsion plants of modern LNG tankers. Features of conventional and advanced steam plants were confronted with propulsion plants such as Dual Fuel – Diesel electric and plants equipped with slow speed two stroke diesel engines. Propulsion plants were compared in terms of plant efficiency, reliability and environmental. The shipyard’s order book and the active fleet of LNG carriers with a capacity above 65000 m3 were analyzed.

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6

Mariaux, G., J. L. Peube, and Y. Gervais. "Inertia Effects on Pulsed Propulsion: Application to the Study of a Hydro-Propulsor." Journal of Ship Research 44, no. 02 (June 1, 2000): 83–95. http://dx.doi.org/10.5957/jsr.2000.44.2.83.

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The marine propulsion systems that exist at the moment rely on the product creating an almost continuous flow in which the mechanical energy is given to the liquid in a continuous fashion. Here we study an original seawater propulsor in which the mechanical energy is provided to the liquid by the alternative displacement of a fluid contact surface. The produced flow is channeled towards the back of the vehicle that has to be propelled by a system of valves, in order to create an average positive thrust. These valves are free, so their operation is linked with the flow resulting from the interaction between the surface and the fluid contained within the mechanism. The mode of surface displacement clearly shows the discontinuous character of the transmission of the mechanical energy from the engine to the fluid as well as the unsteady flow produced. Therefore we have developed a model which permits study of the technical and geometrical characteristics, the particular flow sizes (pressure and velocity), and the performance of the propulsion system (thrust and efficiency). Three basic parameters allow study of the evolution of the performance of the device in correlation to its geometry. Moreover, we show that it's possible to make the flow almost continuous by increasing the internal fluid mass of the mechanism considerably.

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JONES, L., G. HAYWARD, K. KALYANAM, Y. ROTENBERG, D. SCOTT, and B. STEINBERG. "Fuel cell alternative for locomotive propulsion." International Journal of Hydrogen Energy 10, no. 7-8 (1985): 505–16. http://dx.doi.org/10.1016/0360-3199(85)90080-1.

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8

Sopta, David, Tomislav Bukša, Juraj Bukša, and Ivan Peronja. "Alternative Fuels and Technologies for Short Sea Shipping." Journal of Maritime & Transportation Science 59, no. 1 (December 2020): 61–84. http://dx.doi.org/10.18048/2020.59.04.

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Awareness of the consequences of excessive greenhouse gas emissions in maritime transport has prompted research on the use of alternative fuels and technology, towards environmentally neutral ship propulsion, which has resulted in a number of possibilities. This review provides a systematic overview of the current state of use of ship propulsion and alternative options from the aspect of costs, infrastructure, regulations, availability, environmental protection, technology and the perspective of complete decarbonisation by 2050.

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9

Kaddour, Mirvat. "ALTERNATIVE MOTORS IN AVIATION." Aviation 18, no. 4 (December 22, 2014): 174–77. http://dx.doi.org/10.3846/16487788.2014.985472.

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The increasing demand for air travel leads to more pollution produced by air transport. At the same time the fuel prices are constantly rising. Therefore, it becomes necessary to find alternative energy sources for aircraft (alternative fuel, motors). In this article alternative propulsion systems (fuel) that can be used in aviation, their advantages and disadvantages are reviewed.

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10

Walker, Edward A. "A Fluidic Alternative to the EM Drive Propulsion Concept: The Orthogonal Fluid Flow Propulsion Concept." Studies in Engineering and Technology 5, no. 1 (January 24, 2018): 25. http://dx.doi.org/10.11114/set.v5i1.2669.

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A theoretical space propulsion concept in which a system does not lose its ionized propellant is introduced. Due to the fact that no propellant mass is lost by the system, the theoretical propulsion concept is synonymous to a form of propellant less propulsion similarly to the EM Drive. Therefore, a summarization of the EM drive including a brief description of other advances in ion propulsion is given along with a comparison to the new theoretical propulsion concept to be introduced. The orthogonal fluid flow propulsion concept or OFFPC describes orthogonal fluid flows of ionized propellant injected by orthogonal nozzles into an enclosed chamber where the ionized propellant is governed by electric forces generated by the chamber walls and will be mathematically shown to generate thrust. Inevitably, Newton’s third law and momentum conservation are addressed in relation to the OFFPC. Specifically, aerodynamic momentum conservation in a controlled volume system is used to show that the OFFPC obeys momentum conservation after elucidating the role of Newton’s third law within the theoretical system. The capability of a propulsion system incorporating the OFFPC to regenerate a portion of its electric energy (and voltage) similarly to an automobile alternator will be mathematically expressed. Thus, a description of how the system exhausts energy as with any conventional system is given to show that a propulsion system incorporating the OFFPC is not a perpetual motion device. Lastly, a mathematical demonstration of a hypothetical vehicle is given to show quantitative results and theoretical performance figures produced by the OFFPC.

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11

Mrzljak, Vedran, and Tomislav Mrakovčić. "Comparison of COGES and Diesel-Electric Ship Propulsion Systems." Journal of Maritime & Transportation Science Special edition, no. 1 (April 2016): 131–48. http://dx.doi.org/10.18048/2016-00.131.

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Diesel-electric ship propulsion is a frequent shipowners choice nowadays, especially on passengerships. Despite many diesel engines advantages, their primary disadvantage is emission of pollutants. As environmental standards become more stringent, the question of optimal alternative to diesel-electric propulsion arises. COGES (COmbined Gas turbine Electric and Steam) propulsion system is one of the proposals for alternative propulsion system, primarily due to significant reduction of pollutant emissions. On the other hand, gas turbines have higher specific fuel consumption in comparison with diesel engines what represents their noticeable disadvantage. However, some analyzes suggested that COGES propulsion system could be still cost-effective in comparison to diesel-electric propulsion, particularly on passenger ships where higher initial investment can be compensated by increasing the number of passenger cabins. This paper shows a comparison of above mentioned propulsion systems, which can be useful for the optimal ship propulsion system selection

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Balanescu, Dan Teodor, Vlad Mario Homutescu, Pavel Doru Vasiliu, and Constantin Eusebiu Hritcu. "Combined Cycle Units – An Alternative to Reciprocating Engines in Terrestrial Propulsion Field - Estimation of Performances." Applied Mechanics and Materials 659 (October 2014): 289–94. http://dx.doi.org/10.4028/www.scientific.net/amm.659.289.

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Currently, Combined Cycle Power Plants represent the most advanced technology in the domain of high and medium power generation units operating with fossil fuels. Consequently, the interest for their implementation in the propulsion systems field is justified. At this moment, Combined Cycle Units are used for propulsion only on ships (marine propulsion). The present study goes one step further by referring to a small scale Combined Cycle Unit configured for operation as terrestrial propulsion system and based on a two-pressure-levels Steam Cycle. The performances of this unit are analyzed function by the compressor pressure ratio and HRSG feed water temperature.

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Orkisz, Marek, Piotr Wygonik, and Tomasz Wołoszyn. "PROSPECTIVE ALTERNATIVE PROPULSION SYSTEMS FOR UNMANNED AERIAL VEHICLES." Journal of KONES. Powertrain and Transport 21, no. 4 (January 1, 2014): 369–74. http://dx.doi.org/10.5604/12314005.1130487.

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14

Cavallone, Paride, Elvio Bonisoli, and Giuseppe Quaglia. "Prototyping of manual wheelchair with alternative propulsion system." Disability and Rehabilitation: Assistive Technology 15, no. 8 (June 28, 2019): 945–51. http://dx.doi.org/10.1080/17483107.2019.1629185.

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B Basavaradder, Arun, Dayananda Pai K., and Chethan K N. "Review on alternative propulsion in automotives -hybrid vehicles." International Journal of Engineering & Technology 7, no. 3 (July 8, 2018): 1311. http://dx.doi.org/10.14419/ijet.v7i3.11455.

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The dynamic diminishing in overall oil stores and proximity of stringent outflows runs the world over, have made a desperate prerequisite for the making of automobiles with upgraded effectiveness. This is the change time frame to move with elective powertrains as an Electric driven, hybrid, fuel cell models are being produced. Energy Management System (EMS) are given significance for capacity and improving the effectiveness of machines. The operation of Hybrid Electric Vehicles (HEVs) in different landscape with their fuel utilization is accounted. Hybrid powertrain like series, parallel and mixed are clarified. Testing undertaking is the appropriation of charging station situation for India and compelling use of hybrid vehicles. Battery management is the key part in HEV which require search for various methodologies are taken into for creating. The correlation of the customary motors finished with hybrid vehicles.

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Dziugiel, Bartosz. "Piston-electric propulsion system as reliable alternative for classic and nonconventional piston engine configurations." Aircraft Engineering and Aerospace Technology 92, no. 3 (March 18, 2019): 390–97. http://dx.doi.org/10.1108/aeat-01-2018-0037.

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PurposeThe purpose of this paper is to define reliability requirements to be imposed on electric engines to assure similar or higher value of mean time between failures (MTBF) for mixed piston-electric propulsion configurations when compared to classic and unconventional piston engine configurations.Design/methodology/approachReliability estimation was done using mathematical model of safety of light aircraft commercial operations. The model was developed on the basis of Federal Aviation Administration and National Transport Safety Board data. The analysis was conducted for numerous piston and electric configurations. It allowed comparison of selected solutions and definition of relation between electric engine MTBF and MTBF calculated for entire mixed piston-electric propulsion system.FindingsIt was found that, from reliability point of view, mixed piston-electric engine propulsion is attractive alternative for classic single- and twin-piston configuration. It would allow to at least doubling of MTBF for propulsion without increase of operational cost.Practical implicationsRationale behind exploiting electric propulsion in aviation is provided. Relation between electric engine reliability and entire propulsion reliability was identified and defined. Minimum requirements concerning MTBF value for electric engine application in aviation was assessed. Conclusions from this study can be used for definition of requirements for new aircraft and by the regulatory authorities.Originality/valueOriginality consists in use of real accident statistics included in mathematical model of safety for assessment of MTBF for various classic and novel piston and piston-electric engine configurations of light aircraft. Output from the study can be exploited by the industry.

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Chadwick, A. R., B. Dally, G. Herdrich, and M. Kim. "High-power inductive electric propulsion operation with alternative propellants." Aeronautical Journal 124, no. 1272 (December 3, 2019): 151–69. http://dx.doi.org/10.1017/aer.2019.141.

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ABSTRACTThis paper presents the results of an experimental campaign to measure thruster-relevant parameters for a high-power (180kW) inductive propulsion system utilising Ar, $ {\textrm{O}}_{2}$ , $ \textrm{N}_{2}$ , and $ \textrm{CO}_{2}$ as propellants. Results from the investigation show that inductive thrusters can make use of these propellants without the severe degradation seen in other electric propulsion systems. Furthermore, the collection of experimental data at powers greater than 100kW provides a reference of performance for the high-power electric propulsion devices intended for missions in the near future. Thrust and specific impulse in inductive systems can be improved by preferentially combining the chemical properties of atomic and molecular propellants. The maximum thrust recorded during these experiments was 7.9N, obtained using a combination of argon and oxygen (0.68 Ar + 0.32 $\textrm{O}_{2}$ ). The combination of argon and molecular propellants also decreased thermal losses within the discharge volume. Specific impulse can be doubled for the same input electric power by combining propellants, and future modifications to the thruster geometry and acceleration mechanism can be used to further improve the performance of such systems.

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Dyr, Tadeusz, Karolina Ziółkowska, Przemysław Misiurski, and Małgorzata Kozłowska. "Effectiveness of application alternative drive vehicles in public transport." MATEC Web of Conferences 180 (2018): 01002. http://dx.doi.org/10.1051/matecconf/201818001002.

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European transport policy for the first half the 21st century assumes creating the transport system organised with the respect of the principle of sustainable development, providing economic, social and ecological needs of the society and supporting construction of the integrated society and entirely integrated and competitive Europe. Applying alternative fuels and drives in public transport vehicles, including the development of electric-powered vehicles is an essential instrument of this policy. In the paper fuels applied in the public transport and alternative drives were described. Methodological establishments of evaluation of the investment's financial and economical effectiveness associated with acquiring public means of transport with the alternative drive were discussed. Using the method of the econometric modelling, operational and maintenance costs of use buses with the conventional and alternative drive were described. They constitute the basis of assessment of the financial effectiveness of replacing conventional vehicles with alternative propulsion vehicles. They pointed to benefits resulting from limiting the influence of public transport using alternative propulsion vehicles on the natural environment. They find expression in decreasing transport's external expenses, confirming the economic effectiveness of their application. A special attention was paid on vehicles with the electric propulsion. Their application in the urban transport is a crucial factor of improvement of the air quality in cities. Based on conducted examinations it was pointed at the purpose of applying means of transport with the alternative drive.

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Lave, Lester, Heather MacLean, Chris Hendrickson, and Rebecca Lankey. "Life-Cycle Analysis of Alternative Automobile Fuel/Propulsion Technologies." Environmental Science & Technology 34, no. 17 (September 2000): 3598–605. http://dx.doi.org/10.1021/es991322+.

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Chiong, Meng-Choung, Hooi-Siang Kang, Nik Mohd Ridzuan Shaharuddin, Shabudin Mat, Lee Kee Quen, Ki-Hong Ten, and Muk Chen Ong. "Challenges and opportunities of marine propulsion with alternative fuels." Renewable and Sustainable Energy Reviews 149 (October 2021): 111397. http://dx.doi.org/10.1016/j.rser.2021.111397.

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Luck, D. L. "Life Cycle Considerations in Propulsion Alternatives for Fast Vessels." Journal of Engineering for Gas Turbines and Power 118, no. 3 (July 1, 1996): 636–40. http://dx.doi.org/10.1115/1.2816696.

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Fast vessels are being built and operated for a large range of passenger-carrying applications. Fast cargo-carrying vessels are being considered in a variety of sizes as well. A major decision in design and construction of these vessels is the propulsion system; this decision has major impacts on the operation economics as well as the operational capabilities of the vessels. Factors involved in consideration of propulsion alternatives for fast vessels are examined, with emphasis upon the total life cycle operating implications of these factors. A methodology for considering the factors is suggested, and an example is presented with results of the consideration tradeoffs.

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Wasselin, Thomas, Stephane Richard, Fabrice Le Berr, Jean-Charles Dabadie, and Guillaume Alix. "Potential of Several Alternative Propulsion Systems for Light Rotorcrafts Applications." SAE International Journal of Aerospace 6, no. 2 (September 17, 2013): 563–70. http://dx.doi.org/10.4271/2013-01-2230.

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23

Markowski, Jarosław, Jacek Pielecha, Remigiusz Jasiński, Tomasz Kniaziewicz, and Paweł Wirkowski. "Development of alternative ship propulsion in terms of exhaust emissions." E3S Web of Conferences 10 (2016): 00140. http://dx.doi.org/10.1051/e3sconf/20161000140.

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Pischinger, Stefan. "The Future of Vehicle Propulsion – Combustion Engines and Alternatives." Topics in Catalysis 30/31 (July 2004): 5–16. http://dx.doi.org/10.1023/b:toca.0000029721.52972.e4.

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Szumska, Emilia, Ewelina Sendek-Matysiak, and Marek Pawełczyk. "Life cycle cost assessment of urban buses equipped with conventional and alternative propulsion drive." WUT Journal of Transportation Engineering 120 (March 1, 2018): 395–404. http://dx.doi.org/10.5604/01.3001.0014.4792.

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The number of urban buses equipped with alternative propulsion drives is increasing in Polish public transport companies. The subsidy from European Union funds and governmental programs contribute to increasing number of environmentally friendly means of transport. The life cycle cost (LCC) methodology can provide an understanding of economic aspects of urban bus equipped in different types of propulsion. The LCC analysis delivers the sum of costs related to the acquisition, operation, maintenance and disposal of each bus technology system. The aim of this study is to estimate and compare the life cycle cost of conventional bus, hybrid bus, and CNG powered bus. The paper also provide the total air pollutant emissions through the lifetime of each urban analyzed bus.

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Záležák, Zoltán, Rastislav Bernát, and Norbert Kecskés. "Use of Alternative Fuels at Selected Types of Vehicles." Advanced Materials Research 801 (September 2013): 131–36. http://dx.doi.org/10.4028/www.scientific.net/amr.801.131.

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Every car needs for operation, if possible, the highest quality fuel. Fossil fuels produced from crude oil by conventional technology are being increasingly replaced by alternative fuels. It is caused by new technologies that allow combustion of such fuels and, at the same time, provide economically more efficient operation of cars. From the perspective of ecology, they are also of great importance when it comes to meeting the strict emission standards of the European Union. The experiment compares two types of alternative propulsion with LPG and CNG at selected makes of Fiat cars with 1.4 litre engines. These engines can also utilize conventional fuels – petrol and are mass-produced directly from the factory. The measurements themselves were carried out during predetermined driving cycles such as urban, extra-urban and highway. All the three categories of measurements were carried out under normal driving conditions in a standard manner in compliance with all traffic regulations. Based on all measurements obtained from both engines with LPG and CNG propulsion, we found that the car with the LPG engine became economically more advantageous. The benefit was found in expenses return with this system as well as in measured consumption, prices and availability of filling stations.

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Jenal, Norhisyam, Wahyu Kuntjoro, Thomas Arthur Ward, Khairul Imran Sainan, and Firdaus Mohamad. "Performance Analysis of Ground-Based Static Test for Hydrogen Fuelcell Propulsion System." Applied Mechanics and Materials 393 (September 2013): 510–15. http://dx.doi.org/10.4028/www.scientific.net/amm.393.510.

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Combustion engines are increasingly being regarded as unsustainable in the long-term, because of their negative impact on the environment (e.g. pollution, green-house gas production, and global warming). This has generated worldwide interest in propulsion systems based on renewable alternative energy sources for the future. Fuel cell technology is a promising alternative power source because of their high specific energy, efficiency, and reliability. Hydrogen proton exchange membrane fuel cell (PEMFC) in particular produces zero carbon emissions by having only water vapor as the exhaust. Although there has been much research by automotive industries in developing fuel cell hybrid electric vehicles (FCHEV), fuel cell research for aircraft application is relatively new. Therefore, there is a pressing need for research related to development of aircraft fuel cell electric propulsion systems. Universiti Teknologi MARA (UiTM) is conducting static experiments on different configurations of fuel cell electric propulsion systems. The objective of this study is to understand the behavior of a PEMFC propulsion system under a ground-based static test. A 1 kW PEMFC was used as the main power source for a brushless DC motor electric propulsion system. The electrical characteristics, rotational speed, and thrust data were presented for two different electrical propellers. Analyses of the results were used to characterize the effectiveness of the fuel cell system and its balance of plant. The results were beneficial as a predictive method on defining the optimum electric propulsion system performance needed for future actual flight development.

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Herisajani, Herisajani, Nasrul Nasrul, and Yandrika Putra. "Merancang Panel Kontrol Untuk Pompa Air dan Motor Pengerak Solar Cell." Elektron : Jurnal Ilmiah 6, no. 1 (September 5, 2018): 1–15. http://dx.doi.org/10.30630/eji.6.1.60.

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At this present time increasing electrical energy requirements, and therefore found the latest energy is solar energy. Solar energy can be harnessed as a potential alternative energy source because the energy is very large as well as environmentally friendly. Tool that can be used to convert sunlight directly into electricity is called photovoltaic. On the control panel to control the water pump on the motor control circuit design life turns automatically and manually. To control the timing of the displacement of the pump used to pump two timers. On the control panel of diesel propulsion sell used four times the displacement step. Switching time between steps in the set by a timer. The control panel uses the same circuit with the motor circuit alternating rounds.

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Bassam, Amin. "Dual Fuel Electric System as an alternative Propulsion for LNG Carrier." Port-Said Engineering Research Journal 16, no. 1 (March 1, 2012): 75–83. http://dx.doi.org/10.21608/pserj.2012.103720.

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Seager, Thomas P., and Randy L. Brown. "Comment on “Life-Cycle Analysis of Alternative Automobile Fule/Propulsion Technologies”." Environmental Science & Technology 35, no. 8 (April 2001): 1696–97. http://dx.doi.org/10.1021/es001734e.

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Ünsan, Yalçin, and Metin Taylan. "Alternative Propulsion Systems for Environment Friendly Daily Excursion Type Leisure Boats." Tourism in Marine Environments 3, no. 1 (November 1, 2006): 67–73. http://dx.doi.org/10.3727/154427306779380310.

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Ghedjatti, Ilyes, Shiwei Yuan, and Haixing Wang. "Thermodynamic Investigation of Conventional and Alternative Rocket Fuels for Aerospace Propulsion." IOP Conference Series: Materials Science and Engineering 887 (July 10, 2020): 012033. http://dx.doi.org/10.1088/1757-899x/887/1/012033.

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Meyer, Rudolf X. "The “Flying Carpet” concept: A possible alternative to nuclear space propulsion." Acta Astronautica 58, no. 10 (May 2006): 499–505. http://dx.doi.org/10.1016/j.actaastro.2006.01.008.

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34

Zalacko, Roland, Máté Zöldy, and Győző Simongáti. "COMPARISON OF ALTERNATIVE PROPULSION SYSTEMS - A CASE STUDY OF A PASSENGER SHIP USED IN PUBLIC TRANSPORT." Brodogradnja 72, no. 2 (April 1, 2021): 1–18. http://dx.doi.org/10.21278/brod72201.

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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.

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Angelin, Marcus, Martin Rahm, Erik Gabrielsson, and Lena Gumaelius. "Rocket Scientist for a Day: Investigating Alternatives for Chemical Propulsion." Journal of Chemical Education 89, no. 10 (August 17, 2012): 1301–4. http://dx.doi.org/10.1021/ed200848r.

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Platonov, V., and A. Filatov. "Fatigue life of propulsion shafts: direct calculation as per modern methods." Transactions of the Krylov State Research Centre S-I, no. 2 (December 28, 2020): 68–71. http://dx.doi.org/10.24937/2542-2324-2020-2-s-i-68-71.

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This study is an alternative FEM-based fatigue strength calculation for propulsion shafts as per RS Rules. Direct numerical simulation yielded the fields of stresses and strains. Lifetime assessment was based on S-N fatigue model: critical stresses for this model were obtained as per critical-plane method taking into account non-proportional loading of propulsion shafts. It compares two shaft designs: in compliance with RS Rules and with deviation from them.

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O’Reilly, Dillon, Georg Herdrich, and Darren F. Kavanagh. "Electric Propulsion Methods for Small Satellites: A Review." Aerospace 8, no. 1 (January 18, 2021): 22. http://dx.doi.org/10.3390/aerospace8010022.

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Over 2500 active satellites are in orbit as of October 2020, with an increase of ~1000 smallsats in the past two years. Since 2012, over 1700 smallsats have been launched into orbit. It is projected that by 2025, there will be 1000 smallsats launched per year. Currently, these satellites do not have sufficient delta v capabilities for missions beyond Earth orbit. They are confined to their pre-selected orbit and in most cases, they cannot avoid collisions. Propulsion systems on smallsats provide orbital manoeuvring, station keeping, collision avoidance and safer de-orbit strategies. In return, this enables longer duration, higher functionality missions beyond Earth orbit. This article has reviewed electrostatic, electrothermal and electromagnetic propulsion methods based on state of the art research and the current knowledge base. Performance metrics by which these space propulsion systems can be evaluated are presented. The article outlines some of the existing limitations and shortcomings of current electric propulsion thruster systems and technologies. Moreover, the discussion contributes to the discourse by identifying potential research avenues to improve and advance electric propulsion systems for smallsats. The article has placed emphasis on space propulsion systems that are electric and enable interplanetary missions, while alternative approaches to propulsion have also received attention in the text, including light sails and nuclear electric propulsion amongst others.

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Bandari, Anashe. "Inductively coupled plasmas could be a low-power alternative for satellite propulsion." Scilight 2020, no. 45 (November 6, 2020): 451111. http://dx.doi.org/10.1063/10.0002663.

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Kumar, R. "Solid Oxide Fuel Cells for Transportation: A Clean, Efficient Alternative for Propulsion." ECS Proceedings Volumes 1993-4, no. 1 (January 1993): 948–56. http://dx.doi.org/10.1149/199304.0948pv.

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Buysschaert, F., P. Hendrick, and S. Newman. "Conventional helicopters: an adaptiveness study for more electric and alternative propulsion technologies." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 226, no. 9 (November 16, 2011): 1078–94. http://dx.doi.org/10.1177/0954410011417948.

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Livanos, George A., Gerasimos Theotokatos, and Dimitrios-Nikolaos Pagonis. "Techno-economic investigation of alternative propulsion plants for Ferries and RoRo ships." Energy Conversion and Management 79 (March 2014): 640–51. http://dx.doi.org/10.1016/j.enconman.2013.12.050.

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Zhang, Pengfei, Joan Lozano, and Yifan Wang. "Using Flettner Rotors and Parafoil as alternative propulsion systems for bulk carriers." Journal of Cleaner Production 317 (October 2021): 128418. http://dx.doi.org/10.1016/j.jclepro.2021.128418.

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43

Fish, Frank E. "Advantages of Natural Propulsive Systems." Marine Technology Society Journal 47, no. 5 (September 1, 2013): 37–44. http://dx.doi.org/10.4031/mtsj.47.5.2.

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AbstractThe screw propeller has been the mainstay of marine propulsion, but new developments in biomimetic propulsion can provide advantages in terms of speed, maneuverability, efficiency, and stealth. The diversity of aquatic animals provides designs for drag-based paddling and lift-based oscillatory hydrofoils that can be incorporated into engineered propulsive systems for enhanced performance. While the screw propeller will remain the prominent propulsive device, the choice of alternative biomimetic propulsive systems will be dependent on particular applications, where the specifications dictate improved performance criteria.

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Doustdar, Omid, Soheil Zeraati-Rezaei, Jose Martin Herreros, Athanasios Tsolakis, Karl D. Dearn, and Miroslaw Lech Wyszynski. "Tribological Performance of Biomass-Derived Bio-Alcohol and Bio-Ketone Fuels." Energies 14, no. 17 (August 27, 2021): 5331. http://dx.doi.org/10.3390/en14175331.

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This study relates to developing future alternative fuels and focuses on the effects of a fuel’s molecular structure on its properties and performance in advanced propulsion systems. The tribological performance of various biomass-derived oxygenated alternative fuels, including butanol, pentanol, cyclopentanol, cyclopentanone, and gasoline and their blends with diesel, was investigated. Lubricity tests were conducted using a high-frequency reciprocating rig (HFRR). Cyclopentanone-diesel and cyclopentanol-diesel blends result in smaller wear scar sizes compared to using their neat forms. A lower steel disc contaminated with the alternative fuels during the HFRR tests resulted in worn surface roughness values lower than those of the neat diesel by up to 20%. It is believed that these reductions are mainly due to the presence of the hydroxyl group and the carbonyl group in alcohols and ketones, respectively, which make them more polar and consequently helps the formation of the protective lubrication film on the worn moving surfaces during the sliding process. Overall, the results from this study indicate that environmentally friendly cyclopentanol and cyclopentanone are practical and efficient fuel candidates for future advanced propulsion systems.

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Utomo, Setyo Margo, and Agus Krisnowo. "MANUFACTURING INDUSTRIAL POLICY DEVELOPMENT POLICY FOR ELECTRIC PROPULSION TO IMPROVE LOCAL CONTENT OF RAILWAY INDUSTRY." Majalah Ilmiah Pengkajian Industri 14, no. 2 (August 31, 2020): 125–36. http://dx.doi.org/10.29122/mipi.v14i2.4159.

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To fulfill the demand for a number of railroad products, the national railroad industry, in this case PT. INKA as a train integrator industry in Indonesia still has to import components. TKDN electric train is still low. For this reason, it is time to prepare the industrial development of the national railway propulsion system components and even have a very urgent nature. Railway propulsion systems can be classified into three groups, namely: Electric propulsion systems, Diesel Electric propulsion systems and Diesel Hydraulic propulsion systems. Import dependence, of course, cannot be allowed to continue because it will weaken the competitiveness of the national railroad industry. From the results of the analysis using the "Porter Diamond Condition" method various internal and external factors were identified through the SWOT method to formulate alternative policy formulations for the development of the railroad electric propulsion system industry in Indonesia. Qualitative SWOT data are developed quantitatively through the calculation of SWOT Analysis so that the exact position of the organization is known. From the results of the analysis, and calculations using the SWOT Method, the position of the railway propulation system industry is in the Quadrant IV position, so it is best to use a Defensive Strategy. In this position the Company faces a very unfavorable situation, the company faces various threats and internal weaknesses. For this reason, it is necessary to prioritize strengthening strategies in the Matrix (W-T). Key Words: Electric propulsion; Industrial development; Strategy

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Szelecka, Agnieszka. "Advanced laboratory for testing plasma thrusters and Hall thruster measurement campaign." Nukleonika 61, no. 2 (June 1, 2016): 213–18. http://dx.doi.org/10.1515/nuka-2016-0036.

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Abstract Plasma engines are used for space propulsion as an alternative to chemical thrusters. Due to the high exhaust velocity of the propellant, they are more efficient for long-distance interplanetary space missions than their conventional counterparts. An advanced laboratory of plasma space propulsion (PlaNS) at the Institute of Plasma Physics and Laser Microfusion (IPPLM) specializes in designing and testing various electric propulsion devices. Inside of a special vacuum chamber with three performance pumps, an environment similar to the one that prevails in space is created. An innovative Micro Pulsed Plasma Thruster (LμPPT) with liquid propellant was built at the laboratory. Now it is used to test the second prototype of Hall effect thruster (HET) operating on krypton propellant. Meantime, an improved prototype of krypton Hall thruster is constructed.

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Eslamdoost, Arash, Lars Larsson, and Rickard Bensow. "Net and Gross Thrust in Waterjet Propulsion." Journal of Ship Research 60, no. 02 (June 1, 2016): 78–91. http://dx.doi.org/10.5957/jsr.2016.60.2.78.

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The measurement of the net thrust of a waterjet unit is a cumbersome task and thus as an alternative, the thrust of the waterjet system is expressed based on the momentum flux change through the waterjet unit, called gross thrust. The relation between net thrust and gross thrust is not fully understood, and in the current paper this relation is investigated by employing numerical simulations of the flow around a planing waterjet propelled hull. The validation of the bare hull and self-propelled hull simulations is carried out through comparison of the computed results with experimental data.

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Cameretti, Maria, Andrea Del Pizzo, Luigi Di Noia, Michele Ferrara, and Ciro Pascarella. "Modeling and Investigation of a Turboprop Hybrid Electric Propulsion System." Aerospace 5, no. 4 (November 21, 2018): 123. http://dx.doi.org/10.3390/aerospace5040123.

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Hybrid electric propulsion in the aviation field is becoming an effective alternative propulsion technology with potential advantages, including fuel savings, lower pollution, and reduced noise emission. On the one hand, the aeroengine manufacturers are working to improve fuel consumption and reduce pollutant emissions with new combustion systems; on the other hand, much attention is given to reducing the weight of the batteries increasing the energy density. Hybrid electric propulsion systems (HEPS) can take advantage of the synergy between two technologies by utilizing both internal combustion engines (ICEs) and electric motors (EMs) together, each operating at their respective optimum conditions. In the present work, some numerical investigations were carried out by using a zero-dimensional code able to simulate the flight mission of a turboprop aircraft, comparing fuel consumption and pollutant emissions of the original engine with other two smaller gas turbines working in hybrid configuration. An algorithm has been implemented to calculate the weight of the batteries for the different configurations examined, evaluating the feasibility of the hybrid propulsion system in terms of number of non-revenue passengers.

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Dvornik, Joško, and Srđan Dvornik. "Dual-Fuel-Electric Propulsion Machinery Concept on LNG Carriers." Transactions on Maritime Science 3, no. 2 (October 21, 2014): 137–48. http://dx.doi.org/10.7225/toms.v03.n02.005.

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Human efforts to devise optimum propulsion for their vessels are as old as the vessels themselves. Today these efforts are even more determined as modern shipping requires propulsion systems that are increasingly reliable, available, cost-efficient and able to meet high ecological criteria. The heat transfer towards liquefied gas stored in tanks results in boil-off during cargo handling or voyage. The rate of the evaporated gas amounts to 0.13% per day during the voyage of a fully loaded ship. Steam turbines have been a dominant form of propulsion on liquefied natural gas - LNG carriers for over forty years. Until recently, the possibility of using boil-off gas as fuel for boilers has been the reason for installing steam plants as the only means of propulsion of LNG carriers. However, it has been proved that these plants are not sufficiently efficient due to adverse impacts on both emissions and the vessel’s operating expenses. It has also been found out that dual-fuel-electric propulsion is the most effective alternative to steam. Shipping companies select electric propulsion primarily because it provides excellent manoeuvrability and increased availability, allows reduction of the machinery space and better arrangement of shipping capacity and, naturally, because of lower fuel costs. This paper discusses the newest technologies and the operation principle of the low-pressure four-stroke dual-fuel diesel engine, specificallythe 12V50DF and 9L50DF types produced by Wärtsilä company, and the concept of the dual-fuel-electric propulsion for the new generation of LNG carriers.

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Gutiérrez, José E., Blas Zamora, and Jerónimo A. Esteve. "Alternative Teaching Methodology in Marine Engineering Courses: employing TIC & CFD Tools." Modelling in Science Education and Learning 7 (March 30, 2014): 25. http://dx.doi.org/10.4995/msel.2014.2087.

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An alternative teaching-learning methodology for the subject "Hydrodynamic, Resistance and Propulsion" in Degrees concerned with NAval Engineering, is presented. The goal of the pedagogical approach is the acquirement of appropiate skills related to the ability of analyzing and designing different types of ships. The blended learning concept is employed, including the supervised learnin as key ingredient. The roles of both Information and Communication Technologies (ICT) and Computational Fluid Dynamics (CFD), as educational tuools, are some specific features of the methodology. A pedagocial method that involves project based learning, using CFD, is applied. The evaluation of the student satisfaction is conducted by questionaries.

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