Academic literature on the topic 'Propulsão alternativa'

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Journal articles on the topic "Propulsão alternativa"

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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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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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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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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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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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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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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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Dissertations / Theses on the topic "Propulsão alternativa"

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Luczkiewicz, Claudinilson Alves. "Estudo de um sistema de propulsão de veículos elétricos populares." Universidade do Vale do Rio dos Sinos, 2017. http://www.repositorio.jesuita.org.br/handle/UNISINOS/6095.

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UNISINOS - Universidade do Vale do Rio dos Sinos
Esta pesquisa objetiva explorar a alternativa de propulsão automotiva elétrica e apresentar uma proposta de utilização de equipamentos industriais produzidos em larga escala que possam ser inseridos no subsistema de propulsão de um veículo elétrico com características populares, para, dessa forma, oferecer uma alternativa de rápida inserção dos veículos em centros urbanos. As características de potência e torque da alternativa proposta foram investigadas através da dinâmica longitudinal veicular e dos equipamentos existentes comercializados. São avaliadas três configurações de propulsão, sendo um propulsor elétrico conectado de forma única, com dois propulsores independentes conectados nas rodas traseiras e com quatro propulsores independentes conectados diretamente nas rodas. Foram avaliados também aspectos econômicos, podendo em certos casos apresentar custos atrativos ao consumidor final. Os principais resultados, de acordo com as características técnicas dos equipamentos, a viabilidade econômica e o peso, demonstram que a potência mínima necessária para o desempenho do subsistema de tração deve ser de 33,70 kW com o consumo de energia de 19,10 kWh, estando distribuído na configuração com dois propulsores independentes conectados nas rodas traseiras.
The objective of this study is to explore the alternative of electric automotive propulsion and present a proposal for the use of industrial equipment ever produced on a large scale that can be inserted to the propulsion subsystem of an electric vehicle with popular features, and thus offer an alternative fast integration of vehicles in urban centers. The power and torque characteristics of the alternative proposal were investigated for longitudinal vehicle dynamics and its equipment sold. Three driving settings are evaluated, and an electric thruster connected in a unique way, with two independent propellers connected to the rear wheels and four independent drivers directly connected to the wheels. It is also observed the characteristic of economic viability may present attractive costs to the final consumer. The main results, according to the technical characteristics of the equipment, economic viability and weight, show that the minimum power required for the performance of the traction subsystem should be 33.70 kW with energy consumption of 19.10 kWh and distributed in the configuration with two independent propellers connected to the rear wheels.
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Yuba, Douglas Gustavo Takashi. "Análise de sistemas de propulsão e manobra alternativos para aumento da manobrabilidade de comboios fluviais." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/3/3152/tde-26122014-164222/.

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O presente trabalho aborda análises de sistemas de propulsão e manobra para comboios fluviais, e seus efeitos na manobrabilidade dos comboios. Analisam-se o sistema de propulsão convencional (propulsor mais leme), o sistema azimutal e o equipamento de proa auxiliar combinado com cada um destes sistemas de propulsão. Apresenta-se a modelagem matemática dos sistemas de propulsão e manobra citados, os quais serviram de base para implementação de um simulador computacional utilizado para obtenção dos resultados desta dissertação. As forças e momentos hidrodinâmicos são obtidos através do método das derivadas hidrodinâmicas para as simulações próximas à velocidade de serviço do comboio, enquanto para simulações em baixa velocidade utilizou um método semi-empírico baseado no princípio de cross-flow. Inicialmente, efetuou-se a validação do simulador com resultados da literatura para o caso do comboio com propulsão convencional. Em seguida, o modelo foi adaptado para os demais tipos de sistemas de propulsão e manobra propostos. Os resultados obtidos mostram que há uma maior eficiência do sistema de propulsão azimutal e do equipamento na proa para manobras em baixas velocidades, o que se torna adequado sua aplicação em comboios fluvial, pois essas embarcações navegam em velocidades menores se comparadas a outros tipos de embarcações.
The present work deal with analysis of propulsion and maneuvering systems for pusher-barge system, and results on the maneuverability of convoys. It analyzes the conventional propulsion system (rudder plus propeller), the azimuth system and combined auxiliary equipment bow with each of these propulsion systems. Presents the mathematical modeling of propulsion and maneuvering systems mentioned, which served as the basis for implementation of a computational simulator used to obtain the results of this dissertation. The hydrodynamic forces and moments are obtained by the method of hydrodynamic derivatives for simulations about service speed, while for simulations at low speed used a semi - empirical method based on the principle of cross-flow. Initially, performed the validation of the simulation results with the literature for the case of pusher-barge system with conventional propulsion. Then the model was adapted to other types of propulsion and maneuvering systems proposed. The results show that there is a greater efficiency of azimuth propulsion system and equipment in the bow to maneuver at low speeds, which makes it suitable for application in river transport, because these vessels navigate slower speeds compared to other types of vessels.
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Franke, Chad Earl. "ALTERNATIVE MOTORBOAT PROPULSION SYSTEM DEVELOPMENT: GRAND CANYON." Thesis, The University of Arizona, 2009. http://hdl.handle.net/10150/192339.

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Kaddour, Mirvat. "ALTERNATIVE PROPULSION FOR AIRCRAFT OF GENERAL AVIATION CATEGORY." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-239859.

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Letecká doprava jako všechny ostatní dopravy podílí na produkci emisí skleníkových plynů, což je hlavní důvod změn klimatu. Disertační práce je zaměřena na možnost využití alternativního zdroje energie (paliva, motor) v letectví, aby se snížily emise produkované letadel. Oblast,na která již pracuje je všeobecné letectví, zejména letadel kategorie LSA a VLA. Tři možnosti, alternativní zdroj energie, budou diskutovány. První používá LPG palivo, další je elektrické motory, a poslední přidání katalyzátoru a výfukového systému. U každého z nich bude uvedeno výhody a nevýhody, hlavní změnu pohon letadla nebo výfukového systému a různé výkonnosti letadla v důsledku těchto změn.
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Šlechta, Martin. "Návrh strategie v oblasti elektromobility v ČR pro konkrétní společnost." Master's thesis, Vysoká škola ekonomická v Praze, 2011. http://www.nusl.cz/ntk/nusl-165286.

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The subject of the thesis is to identify and assess the current status of electromobility in the Czech Republic and proposal of partly strategiy and recommendations for company Mercedes-Benz Czech Republic s.r.o. in this area. The theoretical part deals with the definition of the theory of strategic management process, especially the analysis of the external and internal area and methodologies of creation strategy. The practical part describes the characteristics of the Mercedes-Benz Czech Republic s.r.o., direct analysis of the electromobility and internal analysis of the company. Finally, there is a summary SWOT analysis and strategy formulation and recommendations in the area of electromobility for the company.
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Struben, Jeroen J. R. "Essays on transition challenges for alternative propulsion vehicles and transportation systems." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/37159.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Sloan School of Management, 2006.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references.
Technology transitions require the formation of a self-sustaining market through alignment of consumers' interests, producers' capabilities, infrastructure development, and regulations. In this research I develop a broad behavioral dynamic model of the prospective transition to alternative fuel vehicles. In Essay one I focus on the premise that automobile purchase decisions are strongly shaped by cultural norms, personal experience, and social interactions. To capture these factors, I examine important social processes conditioning alternative vehicle diffusion, including the generation of consumer awareness through feedback from driving experience, word of mouth and marketing. Through analysis of a simulation model I demonstrate the existence of a critical threshold for the sustained adoption of alternative technologies, and show how the threshold depends on behavioral, economic and physical system parameters. Word-of-mouth from those not driving an alternative vehicle is important in stimulating diffusion. Further, I show that marketing and subsidies for alternatives must remain in place for long periods for diffusion to become self-sustaining.
(cont.) Results are supported with an analysis of the transition to the horseless carriage at the turn of the 19th century. In the second Essay I explore the co-evolutionary interdependence between alternative fuel vehicle demand and the requisite refueling infrastructure. The analysis is based on a dynamic behavioral model with an explicit spatial structure. I find, first, a bi-stable, low demand equilibrium with urban adoption clusters. Further, the diffusion of more fuel efficient vehicles, optimal for the long run, is less likely to succeed, illustrating the existence of trade-offs between the goals of the early stage transition, and those of the long-run equilibrium. Several other feedbacks that significantly influence dynamics including, supply and demand, and supply-coordination behaviors, are discussed. In Essay three I examine how technology learning and spillovers impact technology trajectories of competing incumbents - hybrid and radical entrants. I develop a technology lifecycle model, with an emphasis on technology heterogeneity. In the model, spillovers can flow to the market leader and can be asymmetric across technologies. find that the existence of learning and spillover dynamics greatly increases path dependence. Interaction effects with other feedbacks, such as scale economies, are very strong. Further, superior radical technologies may fail, even when introduced simultaneously with inferior hybrid technologies.
(cont.) I find that the existence of learning and spillover dynamics greatly increases path dependence. Interaction effects with other feedbacks, such as scale economies, are very strong. Further, superior radical technologies may fail, even when introduced simultaneously with inferior hybrid technologies.
by Jeroen J.R. Struben.
Ph.D.
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Adams, Victor W. "The potential of fuel cells to reduce energy demands and pollution from the UK transport sector." Thesis, Open University, 1998. http://oro.open.ac.uk/19846/.

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Atmospheric carbon dioxide and pollution due to the burning of fossil fuels is increasing. Many scientists attribute global warming to the rising levels of carbon dioxide and other pollutants, some of which also pose risks to health. These can be reduced by the more efficient use of conventional fuels and the development of non-polluting energy resources. Fuel cells offer a highly efficient and low polluting method of generating electricity, and are under development for both the power generation and transport sectors. There is a need to assess (a) emissions from fuel cells using various fuels and (b) ways of introducing such technology to transportation in the near future. Fuel consumption, energy and emissions from the production and use of fuels (hydrogen, methane, propane, petrol, diesel, alcohols and rape methyl ester) are calculated per kilowatt hour of fuel cell output over a range of efficiency. These are compared with those for internal combustion engines with advanced exhaust control and for the recharging of battery driven vehicles. The results, which are applicable to both transport and power generation, enable the best low pollution fuels to be selected and are used to calculate through life emissions for public transport buses. Fuel cells are an ideal solution to reduce pollution from transport, but their commercial development in this field is further away than that for stationary applications. Thus, a transition stage is recommended where fuel cell electrical power stations, based on existing demonstrators, are used to recharge fleets of battery driven vehicles during the development of mobile fuel cell systems. These fleets include public transport and commercial vehicles. Also, fuel cell power stations could provide energy for electric trains. A combined system is proposed where electric trains recharge battery driven commercial vehicles during long journeys. The above proposals would enhance fuel cell development, introducing them alongside current transport systems, possibly using the same fuel.
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Heberley, Brian Douglas. "Analysis of the operational impacts of alternative propulsion configurations on submarine maneuverability." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/67780.

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Thesis (Nav. E. and S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 137-139).
In an effort to develop submarine designs that deliver reduced size submarines with equivalent capabilities of the current USS VIRGINIA (SSN-774 Class) submarine, a joint Navy/Defense Advanced Research Projects Agency (DARPA) called the Tango Bravo (TB) program was initiated in 2004 to overcome technology barriers that have a large impact on submarine size and cost. A focus area of the TB program is propulsion concepts not constrained by a centerline shaft. This thesis investigates the operational impacts that a conceptual propulsion configuration involving the use of azimuthing podded propulsors has on a submarine. Azimuthing pods have been used commercially for years, with applications on cruise ships being quite common although their use on large naval platforms has been nonexistent to date. The use of such systems on a submarine would allow for the removal of systems related to the centerline shaft; freeing up volume, weight, and area that must be allocated and potentially allowing the submarine designer to get outside the speed-size-resistance circular path that results in large, expensive platforms. Potential benefits include having the pods in a relatively undisturbed wake field -possibly increasing acoustic performance as well as improving operational maneuvering characteristics. For this thesis a submarine maneuvering model was created based on analytical techniques and empirical data obtained from the DARPA SUBOFF submarine hullform. This model was analyzed for two configurations: ** A centerline shaft configuration utilizing cruciform control surfaces for yaw and pitch control; ** A podded configuration utilizing pods for propulsion as well as yaw and pitch control. The maneuvering characteristics for each configuration were investigated and quantified to include turning, depth changing, acceleration, deceleration, and response to casualties.
by Brian D. Heberley.
Nav.E.and S.M.
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North, Thomas B. "Liquid Nitrogen Propulsion Systems for Automotive Applications: Calculation of Mechanical Efficiency of a Dual, Double-acting Piston Propulsion System." Thesis, University of North Texas, 2008. https://digital.library.unt.edu/ark:/67531/metadc6070/.

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A dual, double-acting propulsion system is analyzed to determine how efficiently it can convert the potential energy available from liquid nitrogen into useful work. The two double-acting pistons (high- and low-pressure) were analyzed by using a Matlab-Simulink computer simulation to determine their respective mechanical efficiencies. The flow circuit for the entire system was analyzed by using flow circuit analysis software to determine pressure losses throughout the system at the required mass flow rates. The results of the piston simulation indicate that the two pistons analyzed are very efficient at transferring energy into useful work. The flow circuit analysis shows that the system can adequately maintain the mass flow rate requirements of the pistons but also identifies components that have a significant impact on the performance of the system. The results of the analysis indicate that the nitrogen propulsion system meets the intended goals of its designers.
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Rodrigues, Denilson Eduardo. "Fontes alternativas de energias utilizadas na propulsão de microtrator agrícola para o processamento de café em terreiro." Universidade Federal de Viçosa, 2005. http://www.locus.ufv.br/handle/123456789/9755.

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Fundação de Amparo à Pesquisa do Estado de Minas Gerais
Neste trabalho, estudou-se o uso de motores alternativos para a propulsão de um microtrator agrícola utilizado no revolvimento de café no terreiro. Alternativas de energia usadas na propulsão permitem o uso do microtrator em diferentes funções, elevando o índice de mecanização das lavouras brasileiras. Foram implementados e ensaiados três diferentes tipos de motores:, um motor elétrico de corrente alternada (MCA), um de corrente contínua (MCC) e um de combustão interna, de ciclo “Otto” (MCI), montados sobre o chassi de um microtrator utilizado no revolvimento de frutos de cafeeiro em terreiros de secagem. Também foram realizados ensaios de tração, cujos resultados foram confrontados com um modelo, para simulação do comportamento dinâmico trativo. Na montagem do microtrator MCA, empregou-se um motor elétrico trifásico de corrente alternada, alimentado pela rede de energia elétrica convencional por meio de cabos. O microtrator MCC foi impulsionado por um motor de corrente contínua e, neste caso, a energia necessária para a movimentação do sistema era armazenada em baterias de chumbo ácido que acompanham o protótipo. O microtrator MCI, por sua vez, recebeu um motor à combustão interna, dois tempos, a gasolina. As forças de tração máximas para as diferentes montagens foram medidas, demonstrando- se que o sistema MCC é capaz de desenvolver uma força de tração maior que os demais sistemas, obtendo-se os seguintes resultados: 1,66 kN para o MCA, 2,02 kN para o MCC e 1,61 kN para o MCI. Os resultados experimentais comprovaram que os 8aumentos da força, da potência na barra de tração e do coeficiente de tração resultam em um incremento da patinagem dos microtratores utilizados. Verificou-se que, para as três fontes de propulsão, o aumento na velocidade de deslocamento do microtrator demandou maior força para o revolvimento, o mesmo ocorrendo quando se elevou a altura da camada de frutos no terreiro. O modelo adotado para simulação gerou, menores valores para a força, a potência e o coeficiente de tração, quando comparados aos valores experimentais, sendo especialmente adequado à simulação do comportamento trativo do microtrator MCC.
The use of alternative engines for the propulsion of an agricultural microtractor in revolving the coffee on the yard was studied. The alternative sources of energy used in the propulsion allow for the use of microtractor in different functions, therefore rising the mechanization index of the Brazilian agriculture. The following types of engines were implemented and assayed three different engine types: one alternating-current electric engine (MCA), one direct-current electric engine (MCC), and one internal- combustion engine of the Otto-cycle type (MCI). These engines were assembled on the chassis of a microtractor used in revolving the coffee cherries on drying yards. Traction assays were also accomplished, from which the results were confronted with a model for simulation of the dynamic tractive behavior. In assembly of the MCA microtractor, an alternating-current, three-phase electric engine fed by conventional electrical network through cables was used. The MCC microtractor was impelled by a direct- current engine; in this case, the energy needed for the system movement was stored in acid-lead batteries with which the prototype is provided. The MCI microtractor was added with an internal-combustion, two-stroke cycle, gasoline engine. The maximum tractive forces for the different assemblies were measured, so showing that the MCC system is able to develop a higher tractive force than the other systems, as the following results were obtained: 1.66 kN for MCA, 2.02 kN for MCC, and 1.61 kN for MCI. The experimental results proved that the increases in the power, drawbar horsepower, and traction coefficient result into an increased skidding of the microtractors used. For those three propulsion sources, the increase in the displacement speed of the microtractor required higher strength for revolving, and the same occurred when the height of the coffee cherry layer in the yard was increased. The model adopted for simulation rather generated lower values for the force, potency, and coefficient of traction, compared to the experimental values, although it is was especially adequate for simulating the tractive behavior of the MCC microtractor.
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Books on the topic "Propulsão alternativa"

1

Stan, Cornel. Alternative Propulsion for Automobiles. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-31930-8.

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Gardner, L. Alternative transportation fuels: review of research activity in Canada: Report of the Task Force on Alternative Fuels, Associate Committee on Propulsion, National Research Council Canada = Combustibles de transport de remplacement: examen des travaux de recherche au Canada : rapport du Groupe de travail sur les combustibles de remplacement : Comite associe sur la propulsion, Conseil national de recherches du Canada. Ottawa: National Research Council Canada, Division of Mechanical Engineering, 1987.

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Chernicoff, William P. Clean air program: Design guidelines for bus transit systems using electric and hybrid electric propulsion as an alternative fuel. Washington, D.C.]: Federal Transit Administration, Office of Research, Demonstration, and Innovation, 2003.

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Vulpetti, Giovanni. Solar sails: A novel approach to interplanetary travel. New York: Copernicus Books, 2008.

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Research and Technology Organization. Applied Vehicle Technology Panel. Symposium. Gas turbine engine combustion, emissions and alternative fuels =: La combustion dans les turbomoteurs, les emissions et les carburants de remplacement : papers presented at the Applied Vehicle Technology Panel Symposium organised by the former AGARD Propulsion and Energetics Panel held in Lisbon, Portugal, 12-16 October 1998. Neuilly-sur-Seine: Research and Technology Organization, 1999.

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Stan, Cornel. Alternative Propulsion for Automobiles. Springer, 2018.

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Stan, Cornel. Alternative Propulsion for Automobiles. Springer, 2016.

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Braun, John Leonard. Propulsion alternatives for an undersea autonomous vehicle. 1987.

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Jefferson, C. M., and R. H. Barnard. Hybrid Vehicle Propulsion (Advances in Transport). Computational Mechanics, 2002.

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Edgar, Julian. Hybrid and electric cars amateurs sourcebook: ...for everyone interested in alternative car propulsion. CreateSpace Independent Publishing Platform, 2014.

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Book chapters on the topic "Propulsão alternativa"

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Stan, Cornel. "Electric Propulsion Systems." In Alternative Propulsion for Automobiles, 207–55. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-31930-8_4.

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Stan, Cornel. "Alternative Fuels." In Alternative Propulsion for Automobiles, 151–206. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-31930-8_3.

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Stan, Cornel. "Combinations of Propulsion Systems, Energy Sources, Energy Converters, and Storage." In Alternative Propulsion for Automobiles, 257–320. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-31930-8_5.

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Stan, Cornel. "Mobility: Conditions, Requirements, and Scenarios." In Alternative Propulsion for Automobiles, 1–36. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-31930-8_1.

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Stan, Cornel. "Thermal Engines." In Alternative Propulsion for Automobiles, 37–149. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-31930-8_2.

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Stan, Cornel. "Energy Management in the Automobile as a Complex System." In Alternative Propulsion for Automobiles, 321–32. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-31930-8_6.

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Gan, Shaowei. "Alternative Fuel for Ship Propulsion." In Encyclopedia of Ocean Engineering, 1–11. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-10-6963-5_249-1.

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Khandelwal, Bhupendra, Charith J. Wijesinghe, and Shabarish Sriraman. "Effect of Alternative Fuels on Emissions and Engine Compatibility." In Energy for Propulsion, 27–50. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-7473-8_2.

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Herrmann, Christoph, Kuldip Singh Sangwan, Mark Mennenga, Philipp Halubek, and Patricia Egede. "Assessment of Alternative Propulsion Systems for Vehicles." In Glocalized Solutions for Sustainability in Manufacturing, 51–56. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-19692-8_9.

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Trillos, Juan Camilo Gomez, Dennis Wilken, Urte Brand, and Thomas Vogt. "Life Cycle Assessment of a Hydrogen and Fuel Cell RoPax Ferry Prototype." In Progress in Life Cycle Assessment 2019, 5–23. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-50519-6_2.

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AbstractEstimates for the greenhouse gas emissions caused by maritime transportation account for approx. 870 million tonnes of CO2 tonnes in 2018, increasing the awareness of the public in general and requiring the development of alternative propulsion systems and fuels to reduce them. In this context, the project HySeas III is developing a hydrogen and fuel cell powered roll-on/roll off and passenger ferry intended for the crossing between Kirkwall and Shapinsay in the Orkney Islands in Scotland, a region which currently has an excess of wind and tidal power. In order to explore the environmental aspects of this alternative, a life cycle assessment from cradle to end-of-use using the ReCiPe 2016 method was conducted, contrasting the proposed prototype developed within the project against a conventional diesel ferry and a diesel hybrid ferry. The results show that the use of hydrogen derived from wind energy and fuel cells for ship propulsion allow the reduction of greenhouse gas emissions of up to 89% compared with a conventional diesel ferry. Additional benefits are lower stratospheric ozone depletion, ionizing radiation, ozone formation, particulate matter formation, terrestrial acidification and use of fossil resources. In turn, there is an increase in other impact categories when compared with diesel electric and diesel battery electric propulsion. Additionally, the analysis of endpoint categories shows less impact in terms of damage to human health, to the ecosystems and to resource availability for the hydrogen alternative compared to conventional power trains.
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Conference papers on the topic "Propulsão alternativa"

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McKay, Daniel J. "LNG - A Paradox of Propulsion Potential." In Alternative Fuels Conference & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1995. http://dx.doi.org/10.4271/952742.

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Zubair, A. "Alternative Propulsion for Nuclear Submarines." In Warship 2011: Naval Submarines and UUV'S. RINA, 2011. http://dx.doi.org/10.3940/rina.ws.2011.20.

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Furnival, D., and C. Clucas. "Propulsion Alternatives For LNG Carriers." In Design & Operation of Gas Carriers. RINA, 2004. http://dx.doi.org/10.3940/rina.gas.2004.13.

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Kelvin Alves Pinheiro, Gelson Ferreira da Silva Neto, Sérgio de Souza Custódio Filho, Sinfronio Brito Morais, and Alexandre Luiz Amarante Mesquita. "ANÁLISE DE ALTERNATIVAS PARA NOVO SISTEMA DE PROPULSÃO DE LANCHAS ESCOLARES." In IX Congresso Nacional de Engenharia Mecânica. Rio de Janeiro, Brazil: ABCM Associação Brasileira de Engenharia e Ciências Mecânicas, 2016. http://dx.doi.org/10.20906/cps/con-2016-1091.

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Nikitaev, Dennis, and Lawrence Thomas. "In-Situ Alternative Propellants for Nuclear Thermal Propulsion." In AIAA Propulsion and Energy 2021 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2021. http://dx.doi.org/10.2514/6.2021-3597.

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HOLDRIDGE, JEFFREY, KYLE SHEPARD, UWE HUETER, and PHIL SUMRALL. "An infrastructure assessment of alternative Mars Transfer Vehicles." In 26th Joint Propulsion Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1990. http://dx.doi.org/10.2514/6.1990-1999.

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Giannoulis, Andreas, and Karl H. Halse. "Evaluation of a Practical Approach for Numerical Propulsion Tests." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-95339.

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Abstract Prediction of resistance and propulsion characteristics for a ship is among the most important steps in a ship design process. Traditionally, model tests are used for these predictions and the results are extrapolated to the full-scale ship. Model test techniques can provide reasonably accurate results, but the cost and time they require — and the unavoidable scaling issues — have lead Naval Architects to look for other alternatives. With the increasing computer power and the increasing experience with numerical simulation of fluid flow, Computational Fluid Dynamics (CFD) have become an appealing alternative to model tests. Numerical computations will always be a trade-off between computational efforts and numerical accuracy. Typically, increased accuracy requirements will cause the mesh to be very fine, and hence the computational time will increase. At a Workshop on numerical simulation of full-scale ships in Southampton in November 2016, a practical approach for predicting the propulsion characteristics of a full-scale ship was introduced by participants from Becker Marine Systems. The pragmatic CFD approach reduced the computational efforts without scarifying the level of accuracy! In the present work, the alternative practical CFD approach is evaluated in a model scale case to study its benefits and possible short-comings compared to conventional CFD simulations of the self-propulsion case.
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Ghosh, Sujit, Tom Risley, David Sobolewski, William Welch, and Sherry Williams. "Marine Alternative Fuel Performance Testing." In ASME 2012 Internal Combustion Engine Division Spring Technical Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ices2012-81239.

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As part of the U.S. Maritime Administration (MARAD) marine application of alternative fuel initiative, the U.S. Navy provided neat hydrotreated renewable diesel (HRD), derived from the hydroprocessing of algal oils, for operational and exhaust emission testing onboard the T/S STATE OF MICHIGAN. This vessel has diesel-electric propulsion with four caterpillar D-398 compression ignition engines; one of these ship service diesel engines was selected as the test engine. The diesel generator sets power both the propulsion motors propelling the ship and provide the electrical power for the hotel loads of the ship. Ultra-low sulfur diesel (ULSD) was blended with the neat HRD fuel in a 50/50-by-volume blend and tested for over 440 hours on the vessel. Exhaust emissions testing was performed while underway on Lake Michigan using the baseline ULSD assessed earlier. A similar profile was run using the blended test fuel. Emission testing was conducted using the ISO 8178 (D2) test cycle. When emissions testing was completed a series of underway and pierside test runs were conducted to accumulate the remaining engine hours, After all testing, the engine conditions were assessed again using a combination of visual inspection and oil analysis. The remainder of the test fuel will be used to conduct a long-term stability test. The setup, test, and results of this testing, currently underway, are reported here with a discussion of MARAD’s alternative fuels test initiative.
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Stan, Cornel. "Advanced Automotive Propulsion Systems - Alternatives, Combinations and Trends." In Future Transportation Technology Conference & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2001. http://dx.doi.org/10.4271/2001-01-2521.

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Peiffer, Erin E., Joshua S. Heyne, and Meredith B. Colket. "Characteristic Timescales for Lean Blowout of Alternative Jet Fuels." In 2018 Joint Propulsion Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-4914.

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Reports on the topic "Propulsão alternativa"

1

Fields, Gregory M. Alternative Energy and Propulsion Power for Today's US Military. Fort Belvoir, VA: Defense Technical Information Center, May 2009. http://dx.doi.org/10.21236/ada510855.

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Crumley, R. L., R. D. MacDowall, J. E. Hardin, and A. F. Burke. Vehicle performance tests of the Ford/GE first generation single-shaft (ETX-I) alternating current propulsion system. Office of Scientific and Technical Information (OSTI), April 1989. http://dx.doi.org/10.2172/6118091.

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Dewey, Michael A. Synthesis, Evaluation, and Formulation Studies on New Oxidizers as Alternatives to Ammonium Perchlorate in DoD Missile Propulsion Applications. Fort Belvoir, VA: Defense Technical Information Center, April 2007. http://dx.doi.org/10.21236/ada480259.

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Klein, James K. PROPULSION AND POWER RAPID RESPONSE RESEARCH AND DEVELOPMENT (R&D) SUPPORT. Delivery Order 0011: Production Demonstration and Laboratory Evaluation of R-8 and R-8X Hydroprocessed Renewable Jet (HRJ) Fuel for the DoD Alternative Fuels Program. Fort Belvoir, VA: Defense Technical Information Center, May 2010. http://dx.doi.org/10.21236/ada536935.

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