Pub Date : 2023-10-01DOI: 10.53464/jmte.02.2023.03
Milis Nilgun CAIBULA, Constantin MILITARU, Sorin CĂNĂNĂU
The present article aims to increase knowledge of a four-bar mechanism. A four-bar system is a planar mechanism. There are many types of simple mechanisms, such as: Chebyshev, Chebyshev lamda, Hoecken, Roberts, Watt’s, Grasshopper, horse-head, pantograph and Peaucelier. More complex mechanisms are: Stewart platform or Jansen’s linkage. The determination of the degrees of freedom (DOF) for a system is done using the Chebychev-Gruebler-Kutzbach relationship. Due to this fact, the DOF for the four-bar system has the value one. Moreover, we analyze the following angles: θ, α, β and φ3in the mechanism. Finally, using Matlab software the drawing and the dynamic simulation of a four-bar mechanism is carried out. Besides, the dynamic simulation is represented after 3s, 6s and 12s.
{"title":"FOUR-BAR MECHANISM FOR A PORTAL CRANE: A BRIEF OVERVIEW","authors":"Milis Nilgun CAIBULA, Constantin MILITARU, Sorin CĂNĂNĂU","doi":"10.53464/jmte.02.2023.03","DOIUrl":"https://doi.org/10.53464/jmte.02.2023.03","url":null,"abstract":"The present article aims to increase knowledge of a four-bar mechanism. A four-bar system is a planar mechanism. There are many types of simple mechanisms, such as: Chebyshev, Chebyshev lamda, Hoecken, Roberts, Watt’s, Grasshopper, horse-head, pantograph and Peaucelier. More complex mechanisms are: Stewart platform or Jansen’s linkage. The determination of the degrees of freedom (DOF) for a system is done using the Chebychev-Gruebler-Kutzbach relationship. Due to this fact, the DOF for the four-bar system has the value one. Moreover, we analyze the following angles: θ, α, β and φ3in the mechanism. Finally, using Matlab software the drawing and the dynamic simulation of a four-bar mechanism is carried out. Besides, the dynamic simulation is represented after 3s, 6s and 12s.","PeriodicalId":476016,"journal":{"name":"Journal of marine technology and environment","volume":"145 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135275544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-01DOI: 10.53464/jmte.02.2023.02
Grațiela BRÂNZĂ
The maritime sector is responsible for more than 90% of world trade. This generates increasing international shipping fleet, that means significant contribution to environment pollution. In this context, appears the need for a cleaner maritime transport, a green one. The paper presents the concepts of “green shipping”, “eco-ship” and regulations that must be respected in relation to environment protection. This study highlights also the IMO’s regulations for green shipping, as IMO is the most important organization that support the reduction of greenhouse gas emissions from ships. The work examines briefly few options for decarbonisation in shipping, outlining the role of government policies, for huge investments in new and clean technologies and, also, in infrastructure for the production, distribution and utilisation of alternative marine fuels and biofuels.
{"title":"\"THE GREEN SHIPPING. STUDY ON REGULATIONS AND SUSTAINABLE OPTIONS FOR DECARBONISATION \"","authors":"Grațiela BRÂNZĂ","doi":"10.53464/jmte.02.2023.02","DOIUrl":"https://doi.org/10.53464/jmte.02.2023.02","url":null,"abstract":"The maritime sector is responsible for more than 90% of world trade. This generates increasing international shipping fleet, that means significant contribution to environment pollution. In this context, appears the need for a cleaner maritime transport, a green one. The paper presents the concepts of “green shipping”, “eco-ship” and regulations that must be respected in relation to environment protection. This study highlights also the IMO’s regulations for green shipping, as IMO is the most important organization that support the reduction of greenhouse gas emissions from ships. The work examines briefly few options for decarbonisation in shipping, outlining the role of government policies, for huge investments in new and clean technologies and, also, in infrastructure for the production, distribution and utilisation of alternative marine fuels and biofuels.","PeriodicalId":476016,"journal":{"name":"Journal of marine technology and environment","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135275542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-01DOI: 10.53464/jmte.02.2023.05
Iulian ENE
" In this paper will be introduced some of the usual worldwide navigation routes of VLCC type vessels, with presentation of the data collected by the author on the voyages made by a ship with DWT = 307284 tons, during the period December 2015 – December 2018. For reasons of relevance, trips to the high seas lasting more than 7 days were chosen as much as possible. The objective is to investigate the usual hydro-meteorological conditions on some of the main trading patterns of the VLCC - Very Large Crude Carriers, (vessels intended for the transport of crude oil, with a carrying capacity of approximately two million barrels, DWT approximately 270000 - 330000 tons). Diagrams and tables with data collected are also presented. This may be of further assistance in studying the opportunities of using renewable energy sources, in particular the wind one, in order to improve the energy efficiency of such voyages. "
{"title":"STUDY OF HYDRO-METEOROLOGICAL CONDITIONS AND FUEL CONSUMPTION ON THE USUAL TRADING ROUTES OF VLCC (VERY LARGE CRUDE CARRIERS","authors":"Iulian ENE","doi":"10.53464/jmte.02.2023.05","DOIUrl":"https://doi.org/10.53464/jmte.02.2023.05","url":null,"abstract":"\" In this paper will be introduced some of the usual worldwide navigation routes of VLCC type vessels, with presentation of the data collected by the author on the voyages made by a ship with DWT = 307284 tons, during the period December 2015 – December 2018. For reasons of relevance, trips to the high seas lasting more than 7 days were chosen as much as possible. The objective is to investigate the usual hydro-meteorological conditions on some of the main trading patterns of the VLCC - Very Large Crude Carriers, (vessels intended for the transport of crude oil, with a carrying capacity of approximately two million barrels, DWT approximately 270000 - 330000 tons). Diagrams and tables with data collected are also presented. This may be of further assistance in studying the opportunities of using renewable energy sources, in particular the wind one, in order to improve the energy efficiency of such voyages. \"","PeriodicalId":476016,"journal":{"name":"Journal of marine technology and environment","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135275545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-01DOI: 10.53464/jmte.02.2023.09
Catalin Silviu NUTU
This paper presents some very early transhumanism ideas and their relationship with the development of technology and how they almost virtually became reality in our days. Writers like Samuel Butler, Aldous Huxley or George Orwell have long time ago predicted some of the issues humankind will face and some of them also even suggested possible solutions to these future problems which nowadays have become reality. This paper also makes predictions about and presents extensions of these early transhumanism ideas, related to the very recent evolutions in technology and artificial intelligence, but it also presents related dangers and possible future evolutions and solutions to these actual problems, as envisioned by the author of this paper .
{"title":"EARLY TRANSHUMANISM IDEAS AND THEIR EXTENSIONS REGARDING EVOLUTION OF TECHNOLOGY AND OF ARTIFICIAL INTELLIGENCE","authors":"Catalin Silviu NUTU","doi":"10.53464/jmte.02.2023.09","DOIUrl":"https://doi.org/10.53464/jmte.02.2023.09","url":null,"abstract":"This paper presents some very early transhumanism ideas and their relationship with the development of technology and how they almost virtually became reality in our days. Writers like Samuel Butler, Aldous Huxley or George Orwell have long time ago predicted some of the issues humankind will face and some of them also even suggested possible solutions to these future problems which nowadays have become reality. This paper also makes predictions about and presents extensions of these early transhumanism ideas, related to the very recent evolutions in technology and artificial intelligence, but it also presents related dangers and possible future evolutions and solutions to these actual problems, as envisioned by the author of this paper .","PeriodicalId":476016,"journal":{"name":"Journal of marine technology and environment","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135323322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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