16 research outputs found
Inverse Shape Design of Deformable Structures and Deformable Wings
No full textInverse methods are mathematical techniques by which the unknown input of a system is determined from a known or desired output. In this article, a new inverse method for the reverse design of deformable structures is presented. The inverse problem being addressed is the construction of the initial or unloaded shape of an structure such, when deformed under given loads, will acquire a desired pre-defined shape. The method can be used, among several other applications, for the inverse design of deformable airplane wings. For example, given a aerodynamically desired wing geometry, the method can be used to determine the real wing geometry that needs to be manufactured so that when such real wing deforms during flight under the influence of aerodynamic forces, it will naturally acquire the desired aerodynamic configuration. The presented inverse method is based on a novel and general approach which can be used with any structure made of hyperelastic materials. The inverse formulation is derived straightforwardly from the mathematical equations defining the standard direct approach of computational solid mechanics. On the computational side, this means that an inverse shape design code can be developed by making simple changes on an existing direct-analysis code.Fil: Limache, Alejandro Cesar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química (i); Argentin
Model Predictive Periodic Output Path Following
No full textIn this paper, a new model predictive controller forpath following of periodic references is proposed. This controllercombines trajectory planning and tracking stages in a singleoptimization problem for a given periodic parametric path. Inaddition, the constraints of the optimization problem solved bythe controller do not depend on the reference, allowing for suddenchanges in the reference without losing feasibility. To illustratethe performance of the approach we discuss the example of balland plate system.Fil: Sánchez, Ignacio Julián Rodolfo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Matemática Aplicada del Litoral. Universidad Nacional del Litoral. Instituto de Matemática Aplicada del Litoral; ArgentinaFil: D'jorge, Agustina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; ArgentinaFil: Limache, Alejandro Cesar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Matemática Aplicada del Litoral. Universidad Nacional del Litoral. Instituto de Matemática Aplicada del Litoral; ArgentinaFil: González, Alejandro Hernán. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; ArgentinaFil: Ferramosca, Antonio. Universidad Tecnológica Nacional; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina27º Congreso Argentino de Control AutomáticoArgentinaAsociación Argentina de Control Automátic
A Tensor Library for Scientific Computing
No full textThe majority of physical phenomena and their computational simulations are described mathematically in terms of tensors and their different algebraic operations. Possibly the most used tensors are the ones of rank 1 and 2, which correspond to the algebraic concepts of vectors and matrices, respectively. Nevertheless, higher rank tensors (specially 3 and 4) appear at all times in different branches of physics and in numerical methods. One of the major drawbacks of high
performance computing is that the code necessary to perform such tensor operations looks different and it is several lines longer than the corresponding one-line mathematical representation. Here we present a C++ tensor library, called LTensor, that we have developed using modern concepts of
object oriented design and expression templates. As it will be shown, the LTensor library is able to mimic the classical indicial notation and follows Einstein convention about indices. Furthermore, it has other additional features than distinguish it from other libraries based on similar concepts: dynamic dimension size, arbitrary contraction order, customizable storage, inherited class structure, arbitrary looping positions on indicial notations, etc.Fil: Limache, Alejandro Cesar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; ArgentinaFil: Rojas Fredini, Pablo Sebastián. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentin
Tracking periodic parametric references using model predictive control
No full textThis paper presents a model predictive controller for tracking periodic parametric reference curves. The controller is formulated in a single layer so that the time-parameterization of the reference curve, the trajectory planning, and the trajectory tracking tasks are solved in a single optimization problem which is computed at each sampling time. The auxiliary state and input trajectories are introduced into the optimization problem as decision variables, which become the planned trajectory to be effectively followed. By design, the closed-loop system guarantees of recursive feasibility of the optimization problem while being able to handle arbitrary changes of reference during execution time. Such properties are discussed in detail, and new results on the asymptotic average performance are presented. Simulation results show the benefits of the proposed strategy.Fil: Sánchez, Ignacio Julián Rodolfo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; ArgentinaFil: D'jorge, Agustina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; ArgentinaFil: Limache, Alejandro Cesar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Matemática Aplicada del Litoral. Universidad Nacional del Litoral. Instituto de Matemática Aplicada del Litoral; ArgentinaFil: González, Alejandro Hernán. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; ArgentinaFil: Ferramosca, Antonio. Università Degli Studi Di Bergamo; Italia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
Aerodynamic Modeling Using Computational Fluid Dynamics and Sensitivity Equations
No full textA mathematical model for the determination of the aerodynamic forces acting on an aircraft is presented. The mathematical model is based on the generalization of the idea of aerodynamically steady motions. One important use of these results is the determination of steady (time-invariant) aerodynamic forces and moments. Such aerodynamic forces can be determined using computer simulation by determining numerically the associated steady flows around the aircraft when it is moving along such generalized steady trajectories. The method required the extension of standard (inertial) CFD formulations to general non-inertial reference frames. Generalized Navier-Stokes and Euler equations have been derived. The formulation is valid for all ranges of Mach numbers including transonic flow. The method was implemented numerically for the planar case using the generalized Euler equations. The developed computer codes can be used to obtain numerical flow solutions for airfoils moving in general steady motions (i.e. circular motions). From these numerical solutions it is possible to determine the variation of the lift, drag and pitching moment with respect to the pitch rate at different Mach numbers and angles of attack. One of the advantages of the mathematical model developed here is that the aerodynamic forces become well-defined functions of the motion variables (including angular rates). In particular, the stability derivatives are associated with partial derivatives of these functions. These stability derivatives can be computed using finite differences or the sensitivity equation method.Ph. D
Tracking periodic parametric references using model predictive control
No full textThis paper presents a model predictive controller for tracking periodic parametric reference curves. The controller is formulated in a single layer so that the time-parameterization of the reference curve, the trajectory planning, and the trajectory tracking tasks are solved in a single optimization problem which is computed at each sampling time. The auxiliary state and input trajectories are introduced into the optimization problem as decision variables, which become the planned trajectory to be effectively followed. By design, the closed-loop system guarantees of recursive feasibility of the optimization problem while being able to handle arbitrary changes of reference during execution time. Such properties are discussed in detail, and new results on the asymptotic average performance are presented. Simulation results show the benefits of the proposed strategy
Model Predictive Periodic Output Path Following
No full textIn this paper, a new model predictive controller for path following of periodic references is proposed. This controller combines trajectory planning and tracking stages in a single optimization problem for a given periodic parametric path. In addition, the constraints of the optimization problem solved by the controller do not depend on the reference, allowing for sudden changes in the reference without losing feasibility. To illustrate the performance of the approach we discuss the example of ball and plate system
O Método de volumes finitos baseado em elementos aplicado a problemas de elasticidade
No full textTese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Mecânica, Florianópolis, 2011Nas últimas duas décadas, pesquisas sobre a aplicação de métodos numéricos que utilizam o conceito de volume de controle, na área estrutural, tem sido foco de diversos trabalhos. Este trabalho, por sua vez, faz um apanhado abrangente de diversas referências nesta área, buscando caracterizar de uma forma mais clara o que foi desenvolvido até o momento em termos de volumes finitos aplicados a problemas de mecânica estrutural. Além disso, procura desenvolver uma documentação detalhada, sobre o procedimento de discretização do problema utilizando a técnica de Volumes Finitos Baseado em Elementos (EbFVM), onde consta os conceitos físicos, matemáticos e computacionais envolvidos. A seguir, apresenta uma série de novos testes, na maioria deles ainda não constantes na literatura, são resolvidos alguns problemas convenientemente escolhidos, os quais verificam o desempenho do método juntamente com os testes. Assim, como ocorre nas referências consultadas, os resultados aqui apresentados se demonstraram promissores e encorajadores, no sentido de que o método se demonstra estável e coerente em relação a soluções-referências disponíveis, tanto com relação às variáveis primárias (deslocamentos) como nas variáveis recuperadas (tensões), também apresenta uma implementação numérica e computacional relativamente simples. Além disso, o principal elemento impulsionador do trabalho nesta área tem sido a solução de problemas de multifísica, como é o caso da interação fluido-estrutura. O trabalho conclui com uma análise detalhada dos testes e problemas propostos, mostrando que os resultados obtidos são equiparados com as soluções fornecidas pelo método de elementos finitos lineares e apresentam baixíssimos erros quando comparados com soluções analíticas. Por fim, o EbFVM é recomendado para soluções de problemas estruturais.In the last two decades, research on the application of numerical methods using the concept of control volume to the structural area has been the focus of several works. This study provides a comprehensive overview of various references in this area, seeking to characterize more clearly what has been developed on the application of the finite volume method to problems of structural mechanics. It also aims at developing a detailed documentation on the discretization procedure of the problem using the Element based Finite Volume Method (EbFVM), encompassing physical, mathematical and computational concepts. This work presents a series of new verification tests, most of which still not reported in the literature. The test problems were carefully defined in order to verify the performance of the method against analytical solutions and the finite element method. The computational implementation proposed in this work is relatively simples and the simulations have shown promising and encouraging results, yielding stable and consistent solutions with respect to both displacements and nodal stresses (obtained using stress recovery techniques). Based upon the aforementioned assessment, the EbFVM was found suitable to application to structural problems in large scale computation and also in multi-physics problem
Adiantum viscosum A. Cadiz-Veliz & A. E. Villarroel 2023, sp. nov.
No full textAdiantum viscosum A. Cádiz-Véliz & A.E. Villarroel, sp. nov. (Fig. 2, 3) Diagnosis: — Adiantum viscosum differs from A. gertrudis and A. glanduliferum by the presence of capitate and glandular trichomes covering the entire aerial part of the plant, including pinnules, rachis, petioles and petiolules, which produce a sticky and aromatic resin. Type:— CHILE. Valparaíso Region: San Felipe de Aconcagua Province, Putaendo, Cordón del Tabaco, Quebrada de Granallas, 32°36’39.41” S; 70°46’44.72” W, 1330 m elevation, 10 October 2021, A . Cádiz-Véliz & B. Palma-Villalobos 801 (holotype: JBN!; isotypes: SGO!, CONC!). Description:— Terrestrial and saxicolous herb. Rhizomes short and creeping, 2–4 mm in diam. Rhizome scales lanceolate, emarginate, 1.5–2.0 mm long, brown with entire margins, not ciliate. Fronds 12–27 cm long. Petioles 1–1.5 mm diam., 4–13 cm long, covered with lanceolate scales 1.5–2.5 mm, brown, grouped at the base. Blades 2–pinnate, rarely 3–pinnate, 9–15 × 6–9 cm, deltoid in outline, approximately half the length of the frond. Rachises straight. Petiolules 1–5 mm long. Pinnules 8–15 × 8–25 mm, flabellate to reniform in outline, base cuneate-symmetrical or asymmetrical, alternate, terminal pinnae usually larger than underlying ones, margin of sterile pinnules crenulateserrate, margin of fertile pinnules folded towards the underside, forming a false indusium. Veins dichotomous, terminating between the crenulate margins. Trichomes on the aerial parts of the plants, (including pinnules, rachis, petioles and petiolules) dense, capitate, glandular, 0.4–0.6 mm, 3–4 cellular, yellowish, hyaline, exuding a sticky and aromatic resin. False indusia 5–15 per pinnule, rectangular or reniform, with a depressed and hyaline basal margin. Spores not observed. Etymology:— The specific epithet refers to the viscous resin produced by the glandular trichomes. Distribution and habitat:— Currently, the only known locality of the species is the one reported in this manuscript, and corresponds to a southwest-exposed slope in the Quebrada de Granallas (Fig. 1), where it occupies an area <100 m 2, at 1330 m elevation. The species inhabits rock crevices (Fig. 3A), within the vegetation belt Andean Mediterranean sclerophyllous forest of Quillaja saponaria Molina (1782: 354) and Lithraea caustica Hooker & Arnott (1833: 175) (Luebert & Pliscoff 2017). Adiantum viscosum grows accompanied by Tropaeolum azureum Colla in Bertero (1832: 147), Colliguaja odorifera Molina (1782: 354), Porlieria chilensis, and Kageneckia oblonga Ruiz & Pavón (1798b: 289). Phenology:— Adiantum viscosum initiates the formation of its fronds in mid-winter, after the first rains (June– July). The aerial part dies during the dry and warm summer (December–March). Conservation status:— Using IUCN criteria (2012), Adiantum viscosum is proposed as Critically Endangered (CR) B1+B2ab (i,ii,iii), because the extent of occurrence (EOO) is <0.1 km 2, the area of occupancy (AOO) is <0.1 km 2, it is found in a single locality, and a decrease in EOO, AOO and habitat quality due to climate change effects is inferred (Luebert & Pliscoff 2012, Pliscoff et al. 2012). In addition, the Cordón del Tabaco is threatened by mining projects, overgrazing, burning, drought, and unregulated tourism, which could affect the species (Madrid et al. 2018, Cádiz-Véliz & Aliaga-Reyes 2019). Adiantum viscosum is not present in any area of the Sistema Nacional de Áreas Silvestres Protegidas del Estado (SNASPE). Additional specimens examined: Adiantum gertrudis — CHILE. Región de Valparaíso, Provincia de Limache: cerro La Campana, 28 April 1968, C. Villagrán s.n. (SGO 86094); cerro La Campana, 28 October 1968, C. Villagrán s.n. (SGO 83853); cerro La Campana, 1200 m, 28 April 1968, C. Villagrán & A. Mesa s.n. (CONC 33060); cerro La Campana, 1350 m, 24 May 1936, A. Garaventa 3106 (CONC 51092); cerro La Campana, 1300 m, 17 January 1937, A. Garaventa 3250 (CONC 51091); cerro La Campana, 1500 m, 10 December 1938, A. Garaventa 6512 (CONC 51101); cerro La Campana, 1300 m, February 1958, P. Valenzuela 49316 (CONC 97032); cerro La Campana, 1500 m, December 1950, B. Collantes 21702 (CONC 97033); cerro Las Vizcachas, 1300 m, 24 January 1961, C. Behn 4326 (CONC 50160); Provincia de Valparaíso: Quebrada Verde, 2 October 1966, W. Sielfeld s.n (SGO 118182); Jardín Botánico Nacional, 110 m, 2 October 1976, A. Guajardo s.n. (CONC 150685); cuesta Balmaceda Fundo Los Perales, 300 m, 33º6’29.11’’S, 71º37’31’’O, 15 October 2015, S. Teillier & J. Macaya, 8485 (CONC 186661). Adiantum glanduliferum — CHILE. Región de Antofagasta, Provincia de Antofagasta: quebrada de Miguel Díaz, Punta Miguel Díaz, 400 m, 12 October 1941, E. Pisano & R. Bravo 450 (SGO 102164); quebrada del Rincón, Rinconada de Paposo, 250 m, 24º56’S, 70º29’O, 02 December 1989, O. Gálvez, A. Cornejo & M. Villarroel 48 (SGO 127410); Taltal, 20 m, 25º24’S, 70º29’O, 26 September 1940, S. Simpfendorfer s.n. (CONC 97133); Quebrada de San Miguel Rinconada de Paposo, 350 m, 24º58’S, 70º28’O, 4 December 1988, A. Hoffmann 302 (CONC 99049); Quebrada Matancilla, 500 m, 25º06’S, 70º27’O, 27 November 1997, M. Dillon & M. Villarroel 8121 (CONC 150013). Región de Atacama, Provincia de Huasco: Mina Oriente, camino a Carrizal Bajo, 12 October 1992, M. Muñoz 3053 (SGO 131464); Camino a Carrizal Bajo, km 44, 200 m, 28º09’S, 70º57’O, 26 October 1965, M. Ricardi, C. Marticorena & O. Matthei, 1527 (CONC 33988); Huasco, 10 m, 28º28’S, 71º13’O, 15 August 1966, G. Montero 7570 (CONC 63734). Región de Coquimbo, Provincia de Limarí: Fray Jorge, 7 October 1947, B. Sparre 2865 (SGO 102105); Zorrilla, 400 m, 30º50’S, 71º30’O, 5 January 1948, C. Jiles 530 (CONC 33978); Quebrada Toro, 330 m, 30º51’S, 71º18’O, 28 December 1950, C. Jiles 1924 (CONC 33987); Monte Redondo, 400 m, 31º03’S, 71º35’O, 1 October 1947, C. Jiles 332 (CONC 33990); Monte Redondo, 400 m, 31º03’S, 71º35’O, 17 November 1947, C. Jiles 492 (CONC 102113), Fray Jorge, 450 m, 30º40’S, 71º40’O, September 1958, J. Kumerow s.n. (CONC 39881), Provincia de Choapa: río Choapa, 750 m, 31º35’S, 71º32’O, February 1974, R. Torres s.n. (CONC 97134); quebrada El Pangue, 14 km al norte de los Vilos, 120 m, 31º48’S, 71º30’O, 16 October 1971, C. Marticorena, R. Rodríguez & E. Weldt 1390 (CONC 35767); 8 km al norte de Vilos, 30 m, 31º45’S, 71º31’O, 12 October 1963, C. Marticorena & O. Matthei 107 (CONC 33966). Región de Valparaíso, Provincia de Petorca: Chincolco, November 1942, M. Espinosa s.n. (SGO 81656); Zapallar, 11 October 1975, M. Valenzuela s.n. (SGO 135226); Zapallar, November 1980, E. Barrera s.n. (SGO 82908); Puente Guaquén, Carretera Panamericana, 30 m, 32º21’S, 71º27’O, 15 October 1971, C. Marticorena, R. Rodríguez & E. Weldt 1311 (CONC 35765); Pichicuy, 5,20 m, 32º20’S, 71º28’O, 1 November 1974, C. Marticorena, O. Matthei & R. Rodríguez 203 (CONC 43020); Petorca, 700 m, 32º15’S, 70º56’O, 16 September 1937, G. Montero 3156 (CONC 63733); Provincia de San Felipe: Santuario Serranía El Ciprés, 1260 m, 32º40’40’’ S, 70º48’39’’O, 24 August 2013, A. Madrid & J. Larraín 14 (CONC 186148); cerro de lo Vargas, 980 m, 32º40’S, 70º35’O, 17 February 1953, F. Torres s.n. (CONC 38402); Provincia de Valparaíso: Dunas de Concón, 32º56’ S, 71º32’O, 01 October 2002, S. Elórtegui s.n. (SGO 152627); Santuario de la Naturaleza Palmar El Salto, quebrada el Quiteño, 100 m, 33º03’S, 71º30’O, 01 October 2006, L. Flores & F. Aguirre s.n. (SGO 155647); Loncura, 32º46’S, 7132’O, November 1953, H. Gunckel 27.368 (CONC 96929); Quebrada Verde, 30 m, 33º02’S, 71º38’O, 24 August 1943, H. Schlegel 99 (CONC 39901); Cuesta Zapata, 700 m, 33º23’S, 71 º15’O, 27 November 1971, C. Elgueta s.n. (CONC 97045); Provincia de Marga-Marga: Limache, 130 m, 32º59’S, 71º15’O, September 1923, A. Garaventa 703 (CONC 102965); Provincia de San Antonio: Mirasol Algarrobo, 50 m, 33º20’S, 71º39’O, 21 October 1961, C. Aste 38.257 (CONC 96925); Algarrobo, 100 m, 33º21’S, 71º37’O, 2 November 1990, M. Baeza & P. Peñailillo s.n. (CONC 113367). Región Metropolitana, Provincia de Cordillera: Termas de Colina, 15 October 1943, J. Guzmán s.n. (SGO 081570); Provincia de Santiago: Quebrada de Peñalolén, 720 m, 33º28’S, 70º32’O, 10 December 1965, M. Mahu 2573 (CONC 37835); Quebrada Agua del Palo cerro Manquehue, 750 m, 33º22’S, 70º35’O, 10 October 1960, P. Valenzuela 13 (CONC 96924); Macul, 850 m, 33º30’S, 70º31’O, November 1954, A. Masena s.n. (CONC 96928); El Arrayán, 1000 m, 33º21’S,70ª28’O, 27 September 1952, H. Gunckel 26.608 (CONC 96953). Región de O’Higgins, Provincia del Cachapoal: Rancagua, 120 m, 32º22’S, 71º15’O, September 1926, C. Joseph s.n. (CONC 96932); Región del Maule, Provincia de Curicó: costa norte de Llico, 19 November 1969, C. Villagrán s.n. (SGO 85162); Querelema, Vichuquén, February 1923, E. Moore s.n. (SGO 81614); 8 km al norte de Reserva Nacional Laguna Torca, 20 m, 34º42’S, 72º02’O, 13 December 2000, L. Finot & M. Leppe 89 (CONC 150566); Provincia de Cauquenes: 10 m, 35º49’S, 72º35’O, January 1983, N. Toro s.n. (CONC 96948). Región del Ñuble, Provincia del Ñuble: Camino de Trehuaco a Mela, 35 m, 36º25’S, 72º41’O, 28 November 2000, M. Baeza, P. López & M. Parra 1954 (CONC 154386). Región del Bío-bío, Provincia del Biobío: Nacimiento, 70 m, 37º30’S, 72º40’O, E. Barros 517 (CONC 96943). Taxonomic relationships: —As mentioned above, Adiantum viscosum is morphologically similar to A. gertrudis and A. glanduliferum. However, A. poiretii Wikström f. bottini (Giudice & Nieto) Giudice (2016: 337), which inhabits the Andes of Mendoza Province (Argentina) also has glandular trichomes on the rachis, petiolules and the lower part of the pinnules (Giudice 1999, Giudice 2016). Table 1 shows the morphological differences between those four species.Published as part of Cádiz-Véliz, Arón, Palma-Villalobos, Bárbara, Villarroel, Alejandro E. & Muñoz-Schick, Mélica, 2023, Adiantum viscosum (Pteridaceae), a new species endemic to sclerophyllous forest of Central Chile, pp. 183-192 in Phytotaxa 599 (3) on pages 185-189, DOI: 10.11646/phytotaxa.599.3.5, http://zenodo.org/record/801257
Ansiedad, Síntomas de Adicción a las redes sociales y Procrastinación en Adolescentes de Colegios Públicos de Villavicencio
No full textEste estudio propuso como objetivo establecer el tipo de relación entre ansiedad, la procrastinación y los síntomas de adicción a las redes sociales en adolescentes de colegios públicos de Villavicencio. La investigación es de tipo cuantitativa, no experimental transaccional de alcance descriptivo y correlacional y los participantes se seleccionaron mediante un muestreo no probabilístico (Tamayo, 2011). Los instrumentos que se aplicaron son el DASS-21, Cuestionario de Adicción a Redes Sociales (ARS) y Escala de Procrastinación Académica (EPA). Una vez seleccionados los participantes, y aplicados los instrumentos, se realizó un análisis estadístico descriptivo y correlacional a través del programa SPSS para dar cumplimiento a los objetivos. Entre los principales hallazgos se resalta una relación positiva entre ansiedad y adicción a las redes sociales, así como en cada una de sus dimensiones, y una relación negativa entre autorregulación académica y postergación de actividadesThis study proposed as an objective to establish the type of relationship between anxiety, procrastination and symptoms of addiction to social networks in adolescents from public schools in Villavicencio. The research is quantitative, non-experimental, transactional with a descriptive and correlational scope, and the participants were selected through non-probabilistic sampling (Tamayo, 2011). The instruments that were applied are the DASS-21, the Social Media Addiction Questionnaire (ARS) and the Academic Procrastination Scale (EPA). Once the participants had been selected and the instruments were applied, a descriptive and correlational statistical analysis was carried out through the SPSS program to comply with the objectives. Among the main findings is a positive relationship between anxiety and addiction to social networks, as well as in each of its dimensions, and a negative relationship between academic self-regulation and postponement of activities.Psicólogohttp://www.ustavillavicencio.edu.co/home/index.php/unidades/extension-y-proyeccion/investigacionPregrad
