2,464 research outputs found
Dynamic nonlinear analyses for the 4-storey infilled R/C frame: study of a retrofitting solution
No full textA research project on assessment and retrofitting of R/C frame structures is currently being developed under the research programme of the ICONS TMR-research network. This paper presents and discusses the preliminary experimental results from a 4-storey bare frame representative of the common practice of 40~50 years ago in most south European countries and devotes special attention to the study of a retrofitting solution based on bracing and rubber dissipaters, which intends to increase stiffness and damping reducing consequently the earthquake deformation demands.O estudo aqui apresentado concentra-se numa solução de reforço de um pórtico utilizando contraventamentos (k-bracing) com perfis de aço em conjunto com elementos elastoméricos de dissipação. Os resultados das análises não lineares da estrutura com e sem alvenaria e com reforço são apresentados e discutidos. Na segunda parte da comunicação apresentam-se os resultados experimentais já disponíveis e discute-se o problema da modelação recorrendo aos resultados experimentais e comparando os resultados obtidos com diferentes tipos de modelos
DAMS AND DIKES IN DEVELOPMENT: Symposium at the occasion of the World Water Day, 22 March 2001
No full textIntroduction Ir. Hans van Duivendijk: Dams and dikes - benefits, costs and option assessment Prof Kaare Hoege: Dikes, dams and water management Prof dr. Bart Schultz: Living with dams Prof dr. H.L.F. Saeijs and KirstenD. Schuijt: Safe dams and dikes, how safe? Prof ir. J.K. Vrijling: Dams and development The report of the World Commission on Dams Mr. Jamie Skinner:ICOLD's criteria applied to the southem delta area Ir. Leo Santbergen, Jan WillemSlager and drs. Kees Storm: Role of the consultants Drs. A. Leusink: Contractors, their changing role Ir. JJ. Enneking: List of contributors CommitteesKWP-collectio
General strategy on coastline protection: The Dutch case
No full textOverview of the Netherlands policy on coastal protection and coastal defenceHydraulic EngineeringCivil Engineering and Geoscience
System model development and numerical simulation of low-head pumped hydro storage
No full textTo tackle the growing demand for grid-scale energy storage, the ALPHEUS project proposes a novel low-head pumped hydro storage system aimed for coastal application in countries where the topography does not allow for traditional high-head storage. This system consists of a reversible pump-turbine technology with two contra-rotating runners coupled to their respective axial-flux motor-generators as well as a dedicated control, optimising for energy balancing and the provision of ancillary services. To better understand the integration and dynamic interaction of the individual components of the plant and to allow for the simulation of a wide variety of operating conditions and scenarios, this research aims at developing a system model coupling the hydraulic, mechanical and electrical components. Numerical results are compared and verified based on CFD simulations. While some inaccuracies have to be expected, the comparison shows an overall good match with only minor deviations in dynamic behaviour and steady state results.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Offshore and Dredging Engineerin
A control-oriented wind turbine dynamic simulation framework which resolves local atmospheric conditions
No full textWind turbines may experience local weather perturbation, which is not taken into account by the commonly-used wind turbine simulation packages. Without this information, it is extremely challenging to evaluate the controller performance with regard to the effect of the variation of local atmospheric conditions. On the other side, it is too late and costly to wait until field test time. To fill this gap, in this paper, we develop a control-oriented turbine dynamic simulation framework to evaluate the controller performance considering the perturbation of local atmospheric conditions. This goal is achieved by integrating an internal wind turbine (IWT) model in the Weather Research and Forecasting (WRF) simulation tool. The proposed framework is implemented on a 5MW reference wind turbine, where the effects of the local atmospheric conditions are illustrated. The proposed WRF-IWT model are validated by comparing the results with those derived from the Fatigue, Aerodynamics, Structures, and Turbulence (FAST).Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Team Riccardo FerrariTeam Jan-Willem van Wingerde
Multi-criteria analysis to rank offshore renewable technologies to support deep-water oil and gas production
No full textAround 5% of the global offshore oil and gas production is consumed as fuel to power the platforms emitting around 200 million tons of CO2 per year. Adopting renewable energy can increase the oil and gas available for export by reducing internal consumption and opening space for the processing plant. This work presents an improvement to the classical analytical hierarchy process multi-criteria decision analysis method, where a viability check phased is introduced before the criteria weighting. The proposed methodology is then applied to a case in Brazil, where 10MW of continuous electrical power is required by a subsea CO2 separation and reinjection system to be installed at 2000m water depth and 160 km from shore. The selection criteria include technical, economic, and environmental aspects weighted with the contribution of experts. The resulting ranking is offshore wind followed by wave energy, subsea small modular nuclear reactors, and ocean thermal energy conversion.Accepted Author ManuscriptOffshore EngineeringOffshore and Dredging Engineerin
Characterization of rock mass by geostatistical analysis at the Masua Mine ( Sardinia, Italy).
No full textThe purpose of the present paper is to show the application of geostatistical analysis to rock mass characterization, with the Masua Mine (Sardinia, Italy) being the case study. Following a brief description of geostatistical methods and use of 'Variograms' and 'Kriging', the criteria applied for quantification of rock mass properties are discussed. The analysis of rock mass data by geostatistical procedures allows one to infer the variability of rock quality such as defined by the RMR index. Additionally, the deformability and strength parameters are obtained for numerical modelling of mine structures. It is stated that the use of geostatistical methods such as 'Kriging' is more likely to reflect the expected rock mass mechanical behaviour.-from Author
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