20th International Multidisciplinary Scientific GeoConference Proceedings SGEM 2020, Energy and Clean Technologies最新文献

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ENERGY GENERATION FROM OCEAN CURRENTS AND RIVERS USING ELASTICALLY INTERCONNECTED CYLINDERS 利用弹性相互连接的圆柱体从洋流和河流中产生能量

20th International Multidisciplinary Scientific GeoConference Proceedings SGEM 2020, Energy and Clean Technologies Pub Date : 2020-09-20 DOI: 10.5593/sgem2020/4.1/s17.008

N. Markov, G. Nikolov

{"title":"ENERGY GENERATION FROM OCEAN CURRENTS AND RIVERS USING ELASTICALLY INTERCONNECTED CYLINDERS","authors":"N. Markov, G. Nikolov","doi":"10.5593/sgem2020/4.1/s17.008","DOIUrl":"https://doi.org/10.5593/sgem2020/4.1/s17.008","url":null,"abstract":"Spring-mass systems are known to experience vortex-induced vibrations (VIV) when exposed to viscous flows. These vibrations can be efficiently used for energy generation in ocean currents and rivers because significant power density can be extracted even from moderate flow velocities. The VIV generators typically include a large system of vertical or horizontal cylinders aligned perpendicular to the flow. The cylinders are connected elastically to a fixed frame and can oscillate independently. A recent comparative study shows that the VIV generators compete well with other renewable energy sources and clean technologies. This manuscript presents a new technique aiming to increase further the efficiency of the VIV energy generators by introducing some coupling between the motions of their cylindrical members. The VIV of circular cylinders is evaluated with CFD simulations. The motions of independently oscillating cylinders are compared to the motions of elastically interconnected cylinders. The numerical analysis shows that the motion amplitudes can be amplified significantly with suitable elastic interconnections between the cylinders. The proposed approach requires designing various VIV frequencies for the different members of the system, which does not allow them to synchronize their phases, and introduces instability in the motion patterns. The elastic interconnections can increase the efficiency of the green energy generation between 10% and 20% compared to previously proposed similar systems.","PeriodicalId":148638,"journal":{"name":"20th International Multidisciplinary Scientific GeoConference Proceedings SGEM 2020, Energy and Clean Technologies","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117120617","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}

引用次数: 0

CLIMATIC INFLUENCES CONSIDERED IN PAVEMENT DESIGN METHODOLOGY 路面设计方法中考虑的气候影响

20th International Multidisciplinary Scientific GeoConference Proceedings SGEM 2020, Energy and Clean Technologies Pub Date : 2020-09-20 DOI: 10.5593/sgem2020/4.1/s19.044

A. Zuzulová, D. Hodáková, S. Cápayová, T. Schlosser, J. Grosek

{"title":"CLIMATIC INFLUENCES CONSIDERED IN PAVEMENT DESIGN METHODOLOGY","authors":"A. Zuzulová, D. Hodáková, S. Cápayová, T. Schlosser, J. Grosek","doi":"10.5593/sgem2020/4.1/s19.044","DOIUrl":"https://doi.org/10.5593/sgem2020/4.1/s19.044","url":null,"abstract":"Climate change is a global problem with serious social, economic and distributional effects on the environment. It is one of the main current challenges for humanity. Changing climate conditions in the long term, as well as short-term fluctuations and non-standard variation of temperature characteristics, have a significant impact on the behavior of pavement structure. Since the end of the 19th century, average temperatures have risen to 0.6 �C. The article describes the results of measurements and evaluations of non-standard climatic situations occurring in the territory of Slovakia and the assessment of their impacts on road pavement structure. \u0000For the design of pavements structures in the calculations, we consider the deformation of materials for equivalent temperatures derived from actual measured temperatures. The most important characteristics of the asphalt pavement temperature are considered to be the average annual temperature of the asphalt layer, the average daily temperature, and their average values in each of the seasons. The strain and stresses in concrete slabs are important/significant temperature gradients - the temperature difference at the top and bottom surfaces. The requirement from practice was to re-evaluate the behavior of pavement structures with respect to changes in the effects of the temperature regime by measuring temperatures with an analysis of their behavior. \u0000In the paper are examples of calculations and impact of standard and changing weather conditions on the dimensions of the structures and pavements lifetime. Some pavement structural design problems and solutions with respect to their temperature regime and climatic change conditions are described in sections dealing with asphalt pavements and pavements with cement concrete slabs.","PeriodicalId":148638,"journal":{"name":"20th International Multidisciplinary Scientific GeoConference Proceedings SGEM 2020, Energy and Clean Technologies","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129107985","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}

引用次数: 2