Development of an opposed piston geared hypocycloid engine
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.6/7914 |
Resumo: | The conventional slider crank engine has dominated the industry with very few alternative configurations having commercial success. In aircraft applications where engine balancing is critical to reduce vibrations, boxer engines have been developed to reduce this issue. The rising cost of fuel and awareness of pollutant emissions has led to an increased interest in alternative designs where both opposed piston and geared hypocycloid engines present some advantages over the conventional slider crank engine. In this study, a comparison between an opposed piston slider crank and geared hypocycloid engine was made followed by the design of a proposed opposed piston geared hypocycloid engine to be used in aircraft applications. It was found that the performance of the geared hypocycloid engine was similar to that of the slider crank engine in all performance characteristics considered in this study, even when excluding the mechanical losses due to friction of the piston head against the cylinder. Therefore, when considering the potential reduced losses due to friction, the geared hypocycloid engine should achieve higher efficiency. It was also found that the design of an engine is a complex task that is usually done from experience and empirical relations with a lot of practical work needing to be done to better design and describe an engine’s performance. However, this study did not include any practical testing. |
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Development of an opposed piston geared hypocycloid engineCiclo de OttoIgnição Por Faísca (Si)Motor Biela-Manivela (Sce)Motor Com Engrenagem Hipocicloidal (Ghe)Motor de Combustão Interna (Ice)Motor de Pistões Opostos (Ope)Quatro-Tempos (4s)Domínio/Área Científica::Engenharia e Tecnologia::Engenharia AeronáuticaThe conventional slider crank engine has dominated the industry with very few alternative configurations having commercial success. In aircraft applications where engine balancing is critical to reduce vibrations, boxer engines have been developed to reduce this issue. The rising cost of fuel and awareness of pollutant emissions has led to an increased interest in alternative designs where both opposed piston and geared hypocycloid engines present some advantages over the conventional slider crank engine. In this study, a comparison between an opposed piston slider crank and geared hypocycloid engine was made followed by the design of a proposed opposed piston geared hypocycloid engine to be used in aircraft applications. It was found that the performance of the geared hypocycloid engine was similar to that of the slider crank engine in all performance characteristics considered in this study, even when excluding the mechanical losses due to friction of the piston head against the cylinder. Therefore, when considering the potential reduced losses due to friction, the geared hypocycloid engine should achieve higher efficiency. It was also found that the design of an engine is a complex task that is usually done from experience and empirical relations with a lot of practical work needing to be done to better design and describe an engine’s performance. However, this study did not include any practical testing.O motor convencional biela-manivela domina a indústria com escassas alternativas a conseguirem terem sucesso comercial. Em aplicações aeronáuticas onde o balanceamento do motor é crítico para reduzir as vibrações induzidas, motores com a configuração ‘boxer’ foram desenvolvidos para minimizar este problema. O crescente custo de combustível e preocupação com as emissões de gases poluentes levou a um aumento no interesse por motores alternativos onde os ambos os motores de pistões opostos e engrenagem hipocicloidal apresentam algumas vantagens sobre os motores de biela-manivela convencionais. Neste estudo é feita uma comparação entre dois motores de pistões opostos, o primeiro com um conjunto biela-manivela e o segundo com engrenagem hipocicloidal, seguido de uma proposta de desenho de um motor de pistões opostos hipocicloidal para ser usado em aplicações aeronáuticas. Verificou-se que o desempenho do motor com engrenagem hipocicloidal foi semelhante ao do motor com biela-manivela em todas as características de desempenho consideradas neste estudo, mesmo excluindo as perdas mecânicas por fricção entre o pistão e o cilindro. Assim, se considerarmos a potencial redução nas perdas por fricção, o motor com engrenagem hipocicloidal deverá alcançar uma eficiência superior. Verificou-se também que o desenvolvimento de um motor é uma tarefa complexa que normalmente é feita com base na experiência e relações empíricas sendo necessário muito trabalho experimental para melhor desenvolver e caracterizar o desempenho do motor. Apesar disso, neste estudo não foi feito qualquer trabalho experimental.Brojo, Francisco Miguel Ribeiro ProençauBibliorumNunes, Alexandre José Rosa2019-12-17T17:07:11Z2017-10-242017-10-22017-10-24T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10400.6/7914TID:202339882enginfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-12-15T09:47:34Zoai:ubibliorum.ubi.pt:10400.6/7914Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T00:48:22.056503Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Development of an opposed piston geared hypocycloid engine |
title |
Development of an opposed piston geared hypocycloid engine |
spellingShingle |
Development of an opposed piston geared hypocycloid engine Nunes, Alexandre José Rosa Ciclo de Otto Ignição Por Faísca (Si) Motor Biela-Manivela (Sce) Motor Com Engrenagem Hipocicloidal (Ghe) Motor de Combustão Interna (Ice) Motor de Pistões Opostos (Ope) Quatro-Tempos (4s) Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Aeronáutica |
title_short |
Development of an opposed piston geared hypocycloid engine |
title_full |
Development of an opposed piston geared hypocycloid engine |
title_fullStr |
Development of an opposed piston geared hypocycloid engine |
title_full_unstemmed |
Development of an opposed piston geared hypocycloid engine |
title_sort |
Development of an opposed piston geared hypocycloid engine |
author |
Nunes, Alexandre José Rosa |
author_facet |
Nunes, Alexandre José Rosa |
author_role |
author |
dc.contributor.none.fl_str_mv |
Brojo, Francisco Miguel Ribeiro Proença uBibliorum |
dc.contributor.author.fl_str_mv |
Nunes, Alexandre José Rosa |
dc.subject.por.fl_str_mv |
Ciclo de Otto Ignição Por Faísca (Si) Motor Biela-Manivela (Sce) Motor Com Engrenagem Hipocicloidal (Ghe) Motor de Combustão Interna (Ice) Motor de Pistões Opostos (Ope) Quatro-Tempos (4s) Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Aeronáutica |
topic |
Ciclo de Otto Ignição Por Faísca (Si) Motor Biela-Manivela (Sce) Motor Com Engrenagem Hipocicloidal (Ghe) Motor de Combustão Interna (Ice) Motor de Pistões Opostos (Ope) Quatro-Tempos (4s) Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Aeronáutica |
description |
The conventional slider crank engine has dominated the industry with very few alternative configurations having commercial success. In aircraft applications where engine balancing is critical to reduce vibrations, boxer engines have been developed to reduce this issue. The rising cost of fuel and awareness of pollutant emissions has led to an increased interest in alternative designs where both opposed piston and geared hypocycloid engines present some advantages over the conventional slider crank engine. In this study, a comparison between an opposed piston slider crank and geared hypocycloid engine was made followed by the design of a proposed opposed piston geared hypocycloid engine to be used in aircraft applications. It was found that the performance of the geared hypocycloid engine was similar to that of the slider crank engine in all performance characteristics considered in this study, even when excluding the mechanical losses due to friction of the piston head against the cylinder. Therefore, when considering the potential reduced losses due to friction, the geared hypocycloid engine should achieve higher efficiency. It was also found that the design of an engine is a complex task that is usually done from experience and empirical relations with a lot of practical work needing to be done to better design and describe an engine’s performance. However, this study did not include any practical testing. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-10-24 2017-10-2 2017-10-24T00:00:00Z 2019-12-17T17:07:11Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.6/7914 TID:202339882 |
url |
http://hdl.handle.net/10400.6/7914 |
identifier_str_mv |
TID:202339882 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
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RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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