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Lock-in and drag amplification effects in slender line-like structures through CFD
Ali Vasallo Belver,Antolín Lorenzana Ibán,Riccardo Rossi 한국풍공학회 2012 Wind and Structures, An International Journal (WAS Vol.15 No.3
Lock-in and drag amplification phenomena are studied for a flexible cantilever using a simplified fluid-structure interaction approach. Instead of solving the 3D domain, a simplified setup is devised, in which 2D flow problems are solved on a number of planes parallel to the wind direction and transversal to the structure. On such planes, the incompressible Navier-Stokes equations are solved to estimate the fluid action at different positions of the line-like structure. The fluid flow on each plane is coupled with the structural deformation at the corresponding position, affecting the dynamic behaviour of the system. An Arbitrary Lagrangian-Eulerian (ALE) approach is used to take in account the deformation of the domain, and a fractional-step scheme is used to solve the fluid field. The stabilization of incompressibility and convection is achieved through orthogonal quasi-static subscales, an approach that is believed to provide a first step towards turbulence modelling. In order to model the structural problem, a special one-dimensional element for thin walled cross-section beam is implemented. The standard secondorder Bossak method is used for the time integration of the structural problem.
Lock-in and drag amplification effects in slender line-like structures through CFD
Belver, Ali Vasallo,Iban, Antolin Lorenzana,Rossi, Riccardo Techno-Press 2012 Wind and Structures, An International Journal (WAS Vol.15 No.3
Lock-in and drag amplification phenomena are studied for a flexible cantilever using a simplified fluid-structure interaction approach. Instead of solving the 3D domain, a simplified setup is devised, in which 2D flow problems are solved on a number of planes parallel to the wind direction and transversal to the structure. On such planes, the incompressible Navier-Stokes equations are solved to estimate the fluid action at different positions of the line-like structure. The fluid flow on each plane is coupled with the structural deformation at the corresponding position, affecting the dynamic behaviour of the system. An Arbitrary Lagrangian-Eulerian (ALE) approach is used to take in account the deformation of the domain, and a fractional-step scheme is used to solve the fluid field. The stabilization of incompressibility and convection is achieved through orthogonal quasi-static subscales, an approach that is believed to provide a first step towards turbulence modelling. In order to model the structural problem, a special one-dimensional element for thin walled cross-section beam is implemented. The standard second-order Bossak method is used for the time integration of the structural problem.
Ad-hoc vibration monitoring system for a stress-ribbon footbridge: from design to operation
Iban, Norberto,Soria, Jose M.,Magdaleno, Alvaro,Casado, Carlos,Diaz, Ivan M.,Lorenzana, Antolin Techno-Press 2018 Smart Structures and Systems, An International Jou Vol.22 No.1
Pedro $G{\acute{o}}mez$ Bosque footbridge is a slender and lightweight structure that creates a pedestrian link over the Pisuerga River, Valladolid, Spain. This footbridge is a singular stress ribbon structure with one span of 85 m consisting on a steel plate and precast concrete slabs laying on it. Rubber pavement and a railing made of stainless steel and glass complete the footbridge. Because of its lively dynamics, prone to oscillate, a simple and affordable structural health monitoring system was installed in order to continuously evaluate its structural serviceability and to estimate its modal parameters. Once certain problems (conditioning and 3D orientation of the triaxial accelerometers) are overcome, the monitoring system is validated by comparison with a general purpose laboratory portable analyzer. Representative data is presented, including acceleration magnitudes and modal estimates. The evolution of these parameters has been analysed over one-year time.
Structural and optical characterization of InGaN/GaN quantum wells grown in cubic phase by MBE
Luis Faustino MEJIA-CUELLAR,Yenny Lucero CASALLAS-MORENO,Alberto PIEDRA-LORENZANA,Carlos Alberto HERNANDEZ-GUTIE,Dagoberto CARDONA,Saul ARIAS-CERON,Juan HERNANDEZ-ROSAS,Jose Luis HERRERA-PEREZ,Emmanue 한국진공학회 2016 한국진공학회 학술발표회초록집 Vol.2016 No.8
Ad-hoc vibration monitoring system for a stress-ribbon footbridge: from design to operation
Norberto Iban,Jose M. Soria,Alvaro Magdaleno,Carlos Casado,Ivan M. Diaz,Antolin Lorenzana 국제구조공학회 2018 Smart Structures and Systems, An International Jou Vol.22 No.1
Pedro Gómez Bosque footbridge is a slender and lightweight structure that creates a pedestrian link over the Pisuerga River, Valladolid, Spain. This footbridge is a singular stress ribbon structure with one span of 85 m consisting on a steel plate and precast concrete slabs laying on it. Rubber pavement and a railing made of stainless steel and glass complete the footbridge. Because of its lively dynamics, prone to oscillate, a simple and affordable structural health monitoring system was installed in order to continuously evaluate its structural serviceability and to estimate its modal parameters. Once certain problems (conditioning and 3D orientation of the triaxial accelerometers) are overcome, the monitoring system is validated by comparison with a general purpose laboratory portable analyzer. Representative data is presented, including acceleration magnitudes and modal estimates. The evolution of these parameters has been analysed over one-year time.
Marıa de los Angeles Fortis-Barrera,Francisco Javier Alarcon-Aguilar,Araceli Becerril-Garcıa,Jose Luis Eduardo Flores-Saenz,Julio Cesar Almanza-Perez,Mario Garcıa-Lorenzana,Roberto Carlos Lazzarini-Le 한국식품영양과학회 2020 Journal of medicinal food Vol.23 No.7
In Central and South American traditional medicine, people use Cecropia obtusifolia Bertol (Cecropiaceae) for the treatment of diabetes mellitus. However, its hypoglycemic action mechanism at pancreatic and liver level has been poorly explored. The present research aimed to establish the influence of the aqueous extract of C. obtusifolia, standardized in its content of chlorogenic acid, on insulin secretion in RINm5F cells and over the liver carbohydrates and lipids metabolism, and to determine concomitantly its hepatoprotective effect on mice with streptozotocin-induced diabetes. In RINm5F cells, concentrations 5, 50, 100, and 200 μg/mL of aqueous extract of C. obtusifolia were used to determine [Ca2+]i and insulin secretion. In an acute study, the extract was administered at doses of 500 mg/kg. In another test (subacute), the extract was daily administrated to diabetic mice (200 mg/kg/day) for 30 days. Blood glucose levels and other biochemical parameters were determined, and a liver histological analysis was performed. In RINm5F cells, C. obtusifolia increased [Ca2+]i and insulin secretion, whereas in diabetic mice exhibited acute and subacute hypoglycemic effects. Daily administration of C. obtusifolia to diabetic mice also increased liver glycogen storage and glycogen synthase levels, without apparent changes in gluconeogenesis. Besides, it increased peroxisome proliferator-activated receptor-α (PPAR-α) and long-chain-fatty-acid-CoA ligase 1 (ACSL-1) expression and reduced triglycerides, transaminases (alanine aminotransferase and aspartate aminotransferase), and collagen fibers, modifying anti-inflammatory (adiponectin and interleukin-10) and inflammatory (tumor necrosis factor-α) cytokines in serum. Therefore, the hypoglycemic effect of C. obtusifolia implicates a dual action, promoting insulin secretion, liver glycogen accumulation, and hepatoprotection by decreasing collagen fibers and inflammatory markers, whereas it improves lipid metabolism, due in part to PPAR-α.