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Letteratura scientifica selezionata sul tema "PRISMATIC ELEMENT"

Autore: Grafiati

Pubblicato: 11 settembre 2023

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Articoli di riviste sul tema "PRISMATIC ELEMENT"

1

Klochkov, Yu V., A. P. Nikolaev, O. V. Vakhnina e M. Yu Klochkov. "Finit element model of pipeline discretization by prismatic elements". IOP Conference Series: Materials Science and Engineering 698 (18 dicembre 2019): 066012. http://dx.doi.org/10.1088/1757-899x/698/6/066012.

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2

Gong, Jian, John L. Volakis e Helen T. G. Wang. "Efficient finite element simulation of slot antennas using prismatic elements". Radio Science 31, n. 6 (novembre 1996): 1837–44. http://dx.doi.org/10.1029/96rs02423.

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3

LEUNG, A. Y. T., e B. ZHU. "HEXAHEDRAL FOURIER p-ELEMENTS FOR VIBRATION OF PRISMATIC SOLIDS". International Journal of Structural Stability and Dynamics 04, n. 01 (marzo 2004): 125–38. http://dx.doi.org/10.1142/s0219455404001100.

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Fourier p-elements of trapezoidal and cubical hexahedron shapes for the free vibration analysis of 3D elastic solids are presented. Trigonometric functions are used as enriching functions to avoid ill-conditioning problems associated with high order polynomials. The element matrices are analytically integrated in closed form. With the additional Fourier degrees-of-freedom, the accuracy of the computed natural frequencies is greatly improved. As an example, the natural frequencies of a cantilever cube are analyzed by a rectangular hexahedron Fourier p-element, two trapezoidal hexahedron Fourier p-elements and the conventional linear finite elements. The results show that the convergence rate of the present elements is very fast with respect to the number of trigonometric terms. The present elements also produce higher accurate modes than the linear finite elements for the same number of degrees-of-freedom. Furthermore, the first six natural frequencies of a cantilever hexagonal prism and a number of concrete dams with different lengths are given as numerical examples.

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Ghesmi, Mahdi, e Bettar Ould el Moctar. "Application of contact elements to represent prismatic mechanical couplings". MATEC Web of Conferences 272 (2019): 01028. http://dx.doi.org/10.1051/matecconf/201927201028.

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Accurate prediction of loads on mechanical couplings is crucial in assessment of loads on coupled structures and in optimization of mechanical coupling design. In this paper, a contact element model is introduced to represent prismatic joints. A twofold pushing convoy in shallow water was taken for time domain numerical simulations in regular waves. The prismatic joints interconnecting the convoy bodies allowed relative heave and pitch motions of the bodies relative to each other. The articulation forces and body motions were compared to model basin measurements to assess the reliability of contact element model. The contact element model could simulate the prismatic joints efficiently and it provided a suitable method to idealize free and suppressed modes at articulation locations.

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Dharma, Adrian Pramudita, e Bambang Suryoatmono. "Non-Linear Buckling Analysis of Axially Loaded Column with Non-Prismatic I-Section". Journal of the Civil Engineering Forum 5, n. 3 (18 settembre 2019): 263. http://dx.doi.org/10.22146/jcef.47607.

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In order to use material efficiently, non-prismatic column sections are frequently employed. Tapered-web column cross-sections are commonly used, and design guides of such sections are available. In this study, various web-and-flange-tapered column sections were analysed numerically using finite element method to obtain each buckling load assuming the material as elastic-perfectly plastic material. For each non-prismatic column, the analysis was also performed assuming the column is prismatic using average cross-section with the same length and boundary conditions. Buckling load of the prismatic columns were obtained using equation provided by AISC 360-16. This study proposes a multiplier that can be applied to the buckling load of a prismatic column with an average cross-section to acquire the buckling load of the corresponding non-prismatic column. The multiplier proposed in this study depends on three variables, namely the depth tapered ratio, width tapered ratio, and slenderness ratio of the prismatic section. The equation that uses those three variables to obtain the multiplier is obtained using regression of the finite element results with a coefficient of determination of 0.96.

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Maksymiuk, Yurii, Andrii Kozak, Ivan Martyniuk e Oleksandr Maksymiuk. "Features of derivation of formulas for calculation of nodal reactions and coefficients of matrix of rigidity of a finite element with averaged mechanical and geometrical parameters". Building constructions. Theory and Practice, n. 8 (29 novembre 2021): 97–108. http://dx.doi.org/10.32347/2522-4182.8.2021.97-108.

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Currently, the most widely used finite element method for the calculation of spatial structures, significant progress in the development of which is associated with the work of domestic and foreign scientists. In Ukrainian publications the problems of theoretical substantiation of the finite element method and its connection with other methods are considered, concrete types of finite elements and their application to various problems of mechanics of a continuous environment are studied. Much attention is paid to the choice of the appropriate shape of the finite element, the type and degree of approximating functions, as well as the development of methods for deriving stiffness matrices. The study of prismatic bodies with constants along one of the coordinates of mechanical and geometric parameters is most appropriate to carry out on the basis of the semi-analytical method of finite elements. Its essence is a combination of finite element sampling and decomposition of displacements in the characteristic direction by a system of trigonometric coordinate functions. The analysis of the literature shows that the issues related to the application of the semi-analytical finite element method to the calculation of thin-walled prismatic bodies in elastic-plastic, and massive even in elastic formulations, have not been properly reflected. In addition, there are no publications in this area devoted to the development of universal prismatic finite elements that allow you to explore massive, thin-walled and combined structures. The direction of this study is to create on the basis of the semi-analytical method of finite elements of an effective apparatus for numerical analysis of the stress-strain state of massive and thin-walled arbitrarily loaded properties of the material and solve a number of new practically important problems. Therefore, in this work, based on the moment diagram of finite elements, formulas for calculating nodal reactions and stiffness matrix coefficients of a finite element with averaged mechanical and geometric parameters for the study of massive, thin-walled and combined structures are derived.

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Coulomb, J. L., F. X. Zgainski e Y. Marechal. "A pyramidal element to link hexahedral, prismatic and tetrahedral edge finite elements". IEEE Transactions on Magnetics 33, n. 2 (marzo 1997): 1362–65. http://dx.doi.org/10.1109/20.582509.

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Bai, Rui, Si-Wei Liu, Siu-Lai Chan e Feng Yu. "Flexural Buckling Strength of Tapered-I-Section Steel Columns Based on ANSI/AISC-360-16". International Journal of Structural Stability and Dynamics 19, n. 11 (23 ottobre 2019): 1950134. http://dx.doi.org/10.1142/s0219455419501347.

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Steel tapered-I-columns are popular in modern buildings due to its material efficiency and the convenience in construction. For evaluating the flexural buckling strength of these columns, the current design methods with empirical and idealized assumptions are sometimes unreliable, especially for slender columns with significant tapering ratios. To accurately calculate the flexural buckling resistance, this paper proposes a numerical framework for tapered-I-sections. The direct analysis method (DM) with the non-prismatic high-order beam-column elements considering the factors, including the second-order effects, the geometric imperfections, and the residual stresses is developed. A new shape-function representing the most critical initial out-of-straightness curve of a tapered member is adopted. An advanced non-prismatic beam-column element incorporating this imperfection shape-function named the curved tapered-three-hinges (TTH) element is derived. With the availability of the internal degree-of-freedoms, the one-element-per-member (OEPM) modeling method is permitted. Sequentially, a series of parametric studies using the proposed numerical method are conducted for generating the buckling curves for the non-prismatic columns with various tapered-stiffness ratios. The sophisticated finite-element method is adopted to verify the proposed numerical framework. Based on the proposed numerical approach, the design method in ANSI/AISC-360-16 is modified for tapered-I-section columns.

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Ivanchenko, Grigory, Yurii Maksimyuk, Andriy Kozak e Ivan Martyniuk. "CONSTRUCTION OF SOLVING EQUATIONS OF SEMI-ANALYTICAL METHOD OF FINISHED ELEMENTS FOR PRISMATIC BODIES OF COMPLEX SHAPE". Management of Development of Complex Systems, n. 46 (24 giugno 2021): 55–62. http://dx.doi.org/10.32347/2412-9933.2021.46.55-62.

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The article presents an effective numerical approach to the study of arbitrarily loaded massive and thin-walled prismatic bodies of complex shape, the deformation of which can take place beyond the elasticity of the material. The equations of the semi-analytical finite element method (SAFEM) when used to decompose the displacements of Fourier series. The main relations between the spatial problem of the theory of elasticity in a curvilinear coordinate system and the theory of plastic flow for an isotropically reinforcing material under the Mises fluidity condition are presented. In accordance with the method of the moment scheme of finite elements (MSFE), the expressions of deformations of the prismatic finite element due to the nodal values of amplitude displacements are obtained. Formulas for calculating the stiffness matrix coefficients of a finite element (FE) with variable and averaged in the cross-sectional plane mechanical and geometric parameters are derived.

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Suprun, T. T. "LOCAL APPROACH FOR EVALUATING HEAT TRANSFER OF PRISMATIC ELEMENTS ON A FLAT SURFACE". Eurasian Physical Technical Journal 18, n. 3 (37) (24 settembre 2021): 43–47. http://dx.doi.org/10.31489/2021no3/43-47.

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Heat-exchange prismatic elements located on a flat surface are typical for many technical applications. The purpose of the work is to develop local approach for evaluating heat transfer of working surfaces based on local control of thermophysical parameters in characteristic zones of the working environment, using the methods of heat and mass analogy and hot-wire anemometry. The local approach allows more accurately diagnosing the types of flow in the boundary layer of a streamlined element and thereby, the temperature state of individual prismatic elements and the entire arrangement as a whole is determined more accurately. For calculating the local heat transfer of each face of the prism separately and the average surface heat transfer depending on the geometric and operating parameters equations of similarity are proposed.

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Più fonti

Tesi sul tema "PRISMATIC ELEMENT"

1

Vijayakar, Sandeep M. "Finite element methods for quasi-prismatic bodies with application to gears /". The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487335992904337.

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2

Walker, B. D. "A combined finite strip/finite element method for the analysis of partially prismatic thin-walled structures". Thesis, University of Southampton, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375679.

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3

Dia, Mouhamadou. "Hexahedral and prismatic solid-shell for nonlinear analysis of thin and medium-thick structures". Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI040.

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Les structures à faibles ou moyennes épaisseurs sont naturellement présentes dans la plupart des installations de production d'énergie : bâtiment réacteur, tuyauteries sous pression, réservoirs métalliques ou bâches, cuve de réacteur, liners métalliques des enceintes de confinement pour ne citer que ceux‐là. Un besoin actuellement exprimé par les unités d'ingénierie d’EDF est la modélisation des phénomènes de cloquage de liners métalliques des bâtiments réacteur. Un liner est une structures de type tôle métallique assurant la fonction d’étanchéité des centrales nucléaires. Sa modélisation nécessite la prise en compte d’un phénomène de contact-frottement engendrant du pincement sur la coque, de la plasticité sous l’effet de cloquage et de la non linéarité géométrique (instabilité de type flambement). Pour modéliser le comportement thermomécanique d’une structure pareille, les éléments finis de plaques et coques actuellement disponible ne semblent pas être à la hauteur. Le premier verrou attribuable à ces éléments est l’hypothèse des contraintes planes qui empêche la prise en compte de certaines lois de comportement nativement tridimensionnelles. En deuxième lieu, du fait de leur formulation avec des degrés de liberté de rotations ces éléments n’offrent pas une facilité d’utilisation lorsqu’il s’agit de résoudre des problèmes prenant en compte les effets non-linéaires telles que les grande transformations géométriques, le contact-frottement bi-facial, le flambement et les pressions suiveuses. Une alternative serait d’utiliser des éléments volumiques standards. Cependant le coût de calcul prohibitif des ces derniers est difficilement accessible pour de nombreuses applications industrielles. Le but de ces travaux est de proposer une solution à cette problématique. Nous avons proposé une formulation élément fini de type solide-coque enrichie en pincement et capable de reproduire les comportements des structures minces avec une précision satisfaisante. Ce nouvel éléments fini fonctionnent avec tout type de loi de comportement tridimensionnelle sans restriction sur les champs de contraintes. On peut également l’utiliser pour tous les types de problèmes mécaniques : linéaire et non linéaire, contact frottement, grande transformation, flambement, pression suiveuse etc. Les simulations numériques réalisées montrent des performances satisfaisantes
Thin or medium-thick structures are naturally present in most power generation facilities: reactor building, pressurized pipelines, metal tanks or tarpaulins, reactor vessel, metal liners of containment chambers, to name but a few. A need currently expressed by EDF's engineering units is the modeling of the blistering phenomena of metal liners in reactor facilities. A liner is a metal sheet type structure that provides the impermeability function of nuclear power plants. Its modeling requires taking into account a contact-friction phenomenon causing pinching on the shell, plasticity under the effect of blistering and geometric nonlinearity (buckling type instability). To model the thermo-mechanical behavior of such a structure, the finite elements of plates and shells currently available do not seem to be up to the task. The first limitation attributable to these elements is the assumption of plane stresses which prevents the consideration of some natively three-dimensional constitutive laws. Secondly, due to their formulation with rotational degrees of freedom these elements do not offer facility of use when solving problems that take into account non-linear effects such as large geometric transformations, bi-facial friction-contact, buckling and following pressures. An alternative would be to use standard volume elements. However, the prohibitive computing cost of the latter is difficult to access for many industrial applications. The aim of this work is to propose a solution to this problem. We have proposed a solid-shell finite element formulation enriched in their pinching stress and strain and capable of reproducing accurately the behaviour of thin structures. This new finite element works with any type of three-dimensional behaviour law without restriction on stress fields. It can also be used for all types of mechanical problems: linear and nonlinear, frictional contact, large transformation, buckling, displacement-dependent pressure, etc. The numerical simulations carried out show satisfactory performances

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Truscott, Simon. "A heterogenous three-dimensional computational model for wood drying". Thesis, Queensland University of Technology, 2004. https://eprints.qut.edu.au/15960/1/Simon_Trustcott_Thesis.pdf.

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The objective of this PhD research program is to develop an accurate and efficient heterogeneous three-dimensional computational model for simulating the drying of wood at temperatures below the boiling point of water. The complex macroscopic drying equations comprise a coupled and highly nonlinear system of physical laws for liquid and energy conservation. Due to the heterogeneous nature of wood, the physical model parameters strongly depend upon the local pore structure, wood density variation within growth rings and variations in primary and secondary system variables. In order to provide a realistic representation of this behaviour, a set of previously determined parameters derived using sophisticated image analysis methods and homogenisation techniques is embedded within the model. From the literature it is noted that current three-dimensional computational models for wood drying do not take into consideration the heterogeneities of the medium. A significant advance made by the research conducted in this thesis is the development of a three - dimensional computational model that takes into account the heterogeneous board material properties which vary within the transverse plane with respect to the pith position that defines the radial and tangential directions. The development of an accurate and efficient computational model requires the consideration of a number of significant numerical issues, including the virtual board description, an effective mesh design based on triangular prismatic elements, the control volume finite element discretisation process for the cou- pled conservation laws, the derivation of an accurate dux expression based on gradient approximations together with flux limiting, and finally the solution of a large, coupled, nonlinear system using an inexact Newton method with a suitably preconditioned iterative linear solver for computing the Newton correction. This thesis addresses all of these issues for the case of low temperature drying of softwood. Specific case studies are presented that highlight the efficiency of the proposed numerical techniques and illustrate the complex heat and mass transport processes that evolve throughout drying.

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Truscott, Simon. "A heterogenous three-dimensional computational model for wood drying". Queensland University of Technology, 2004. http://eprints.qut.edu.au/15960/.

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The objective of this PhD research program is to develop an accurate and efficient heterogeneous three-dimensional computational model for simulating the drying of wood at temperatures below the boiling point of water. The complex macroscopic drying equations comprise a coupled and highly nonlinear system of physical laws for liquid and energy conservation. Due to the heterogeneous nature of wood, the physical model parameters strongly depend upon the local pore structure, wood density variation within growth rings and variations in primary and secondary system variables. In order to provide a realistic representation of this behaviour, a set of previously determined parameters derived using sophisticated image analysis methods and homogenisation techniques is embedded within the model. From the literature it is noted that current three-dimensional computational models for wood drying do not take into consideration the heterogeneities of the medium. A significant advance made by the research conducted in this thesis is the development of a three - dimensional computational model that takes into account the heterogeneous board material properties which vary within the transverse plane with respect to the pith position that defines the radial and tangential directions. The development of an accurate and efficient computational model requires the consideration of a number of significant numerical issues, including the virtual board description, an effective mesh design based on triangular prismatic elements, the control volume finite element discretisation process for the cou- pled conservation laws, the derivation of an accurate dux expression based on gradient approximations together with flux limiting, and finally the solution of a large, coupled, nonlinear system using an inexact Newton method with a suitably preconditioned iterative linear solver for computing the Newton correction. This thesis addresses all of these issues for the case of low temperature drying of softwood. Specific case studies are presented that highlight the efficiency of the proposed numerical techniques and illustrate the complex heat and mass transport processes that evolve throughout drying.

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Li, Weibing. "Prismatic modular robotics enabled through active and passive elements". Thesis, University of Leeds, 2018. http://etheses.whiterose.ac.uk/20112/.

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Robotic involvement is envisaged for exploration of human-inaccessible areas such as planetary space, confined and unstructured environments, and radioactive places. An exploration mission usually includes multiple tasks that are difficult or even impossible to finish using a single robot. Modular robots aim to solve this problem by providing a robotic system wherein robotic modules can be reconfigured to accomplish diverse tasks. In this work, research is undertaken on the design, manufacturing and control of a modular robotic system consisting of straight extending modules. Each robotic module of the modular robot can be actively controlled or can respond passively to external forces. The modular elements can be connected simply for ease of manual reconfiguration. A new connectivity strategy for building modular robotic structures using rigid connector nodes, active and passive modular elements is investigated. Comparisons of the new connectivity and a conventional connectivity using compliant connector nodes are made with respect to kinematics, locomotion and deformation of some robotic structures. Modular units including a prismatic actuator, a rigid connector node and a passive revolute joint are then designed, manufactured and tested. More modular elements are further replicated for building modular robotic structures leading to a final prototype system with eight prismatic actuators, four rigid connector nodes and four passive revolute joints. Each prismatic actuator is equipped with a locking mechanism and possesses three different working states: it can either be actuated, locked or passive. The three-state prismatic actuator is self-contained with its own computation, communication, actuation and sensing capabilities. A proportional-integral-derivative (PID) controller is implemented to control the position of the prismatic actuator. The actuation and locking forces of the prismatic actuator are experimentally evaluated. The prismatic actuator can vertically lift an external load of 29.4 N. The locking force of the mechanical locker is 78.6 N, enabling the actuator to be capable of vertically supporting a weight of about 2.5 kg in the locked state. The minimum force required to passively move the prismatic actuator is also measured as 8.34 N. The performance of the PID controller, three states and state transitions of the prismatic actuator are then validated by a series of physical experiments. Experimental results demonstrate that the maximum absolute value of the displacement error is to be 0.175 mm in the actuated state, and state transitions between actuated, locked and passive states are physically achievable. Moreover, state transitions of two and multiple prismatic actuators are also realized resorting to communications between the prismatic actuators. As a high-level control strategy, a central pattern generator (CPG) neural network is first applied to modular robotic structures composed of the fabricated robotic modules. Physical experiments show that the modular robotic structures achieve a worm-like locomotion gait through the coordination of their actuators' movements, substantiating the feasibility and effectiveness of the mechanical design and control strategy. Modular robotic structures with greater number of elements are constructed in a physics-based robot simulator. A generalized CPG neural network and a role-based control method are developed for controlling these simulated modular robots. Computer simulations are then conducted to further demonstrate locomotion capability of modular robotic structures composed of three-state prismatic actuators. Simulation results show that the generalized CPG method is scalable to a broad range of robotic structures with different number of modules. The three-state prismatic actuator can be applied to releasing physical constraints of a robotic structure during task execution and achieving a walking pattern by using state transitions.

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Evcimen, Taylan Ulas. "The Effect Of Prismatic Roughness Elemnts On Hydraulic Jump". Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12605792/index.pdf.

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The objective of this study is to determine the effect of different roughness types and arrangements on hydraulic jump characteristics in a rectangular channel. Three different types of roughness were used along experiments. All of them had rectangular prism shapes and that were placed normal to the flow direction. To avoid cavitation, height of roughness elements were arranged according to level of the channel inlet, so that the crests of roughness elements would not be protruding into the flow. The effects of roughness type and arrangement on hydraulic jump properties, i.e. energy dissipation, length of the jump and tail water depth were investigated. These properties were compared with the available data in literature and with the properties of hydraulic jump occurred on smooth bed.

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Winder, Brian Geoffrey. "Achieving Complex Motion with Fundamental Components for Lamina Emergent Mechanisms". Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2279.pdf.

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BANSAL, ABHISHEK. "INFLUENCE OF SHAPE FACTOR OF PRISMATIC ELEMENT ON THE ENERGY OF RAYLEIGH WAVES". Thesis, 2019. http://dspace.dtu.ac.in:8080/jspui/handle/repository/16965.

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Seismic wave are the form of energy waves which are generated by either due to the sudden breaking of rocks inside the earth’s surface or due to some explosion or can be even caused by some vibrational disturbance caused inside or on the earth and can travel several kilometres within some second just like tsunami travels through the ocean, or the sound travels through the air.

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Macho, Gabriele A., D. Shimizu e I. R. Spears. "The effect of prism orientation and loading direction on contact stresses in prismatic enamel: implications for interpreting wear patterns". 2005. http://hdl.handle.net/10454/3551.

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No
The ability of prisms to effectively dissipate contact stress at the surface will influence wear rates in teeth. The aim of this investigation was to begin to quantify the effect of prism orientation on surface stresses. Seven finite element models of enamel microstructure were created, each model differing in the angulation of prism orientation with regard to the wear surface. For validation purposes, the mechanical behavior of the model was compared with published experimental data. In order to test the enamel under lateral loads, a compressed food particle was dragged across the surface from the dentino-enamel junction (DEJ) towards the outer enamel surface (OES). Under these conditions, tensile stresses in the enamel model increased with increases in the coefficient of friction. More importantly, stresses were found to be lowest in models in which the prisms approach the surface at lower angles (i.e., more obliquely cut prisms), and highest when the prisms approached the surface at 60° (i.e., less obliquely cut). Finally, the direction of travel of the simulated food particle was reversed, allowing comparison of the difference in behavior between trailing and leading edge enamels (i.e., when the food particle was dragged either towards or away from the DEJ). Stresses at the trailing edge were usually lower than stresses at the leading edge. Taken together with what is known about prism orientation in primate teeth, such findings imply greater wear resistance at the intercuspal region and less wear resistance at the lateral enamel at midcrown. Such findings appear to be supported by archeological evidence.

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Libri sul tema "PRISMATIC ELEMENT"

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Hu, Yandong. Electrokinetic transport in microchannels with three-dimensional prismatic elements on the surface. 2005.

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Capitoli di libri sul tema "PRISMATIC ELEMENT"

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Oñate, Eugenio. "Prismatic Structures. Finite Strip and Finite Prism Methods". In Structural Analysis with the Finite Element Method Linear Statics, 675–728. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-1-4020-8743-1_11.

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Hinton, Ernest, Johann Sienz e Mustafa Özakça. "Basic Finite Element Formulation for Shells of Revolution". In Analysis and Optimization of Prismatic and Axisymmetric Shell Structures, 127–40. London: Springer London, 2003. http://dx.doi.org/10.1007/978-0-85729-424-1_4.

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Hinton, Ernest, Johann Sienz e Mustafa Özakça. "Basic Finite Element Formulation for Vibrating Axisymmetric Shells". In Analysis and Optimization of Prismatic and Axisymmetric Shell Structures, 245–78. London: Springer London, 2003. http://dx.doi.org/10.1007/978-0-85729-424-1_7.

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Chaudhury, Arkadeep Narayan, Arnab Ghosh, Krishnendu Banerjee, Abhijit Mondal e Debasis Datta. "Analysis of Prismatic Springs of Non-circular Coil Shape Using Finite Element Method". In Lecture Notes in Mechanical Engineering, 243–51. New Delhi: Springer India, 2016. http://dx.doi.org/10.1007/978-81-322-2740-3_24.

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Fontenla-Carrera, Gabriel, Ángel Manuel Fernández Vilán e Pablo Izquierdo Belmonte. "Automatic Identification of Kinematic Diagrams with Computer Vision". In Proceedings of the XV Ibero-American Congress of Mechanical Engineering, 425–31. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-38563-6_62.

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AbstractIn this work, a computer vision algorithm for the detection and recognition of 2D kinematic diagrams, both from paper schemes and digital files, was developed. Furthermore, it runs even with hand-made diagrams, which can be correctly identified. The algorithm is mainly based on the use of the free computer vision library OpenCV, being able to identify each element of the kinematic diagram, its connection with the other elements and store its pixels, which will allow in future research the implementation of motion in the sketches themselves. Allowed elements are revolute, prismatic, fixed, cylindrical and rigid joints and rigid bars. The main applications of this work are focused on the teaching world, communication of ideas in a quickly and graphical way and for fast and preliminary designs of new mechanisms as people can draw the diagram in a Tablet or paper and simulate it in real time, avoiding the necessity to learn how to operate a specialized simulation software and the time it takes to prepare the virtual model and obtain its results.

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Eslami, M. Reza. "Torsion of Prismatic Bars". In Finite Elements Methods in Mechanics, 229–36. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-08037-6_11.

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Cuomo, M., A. Greco e M. Romano. "Eigenfrequencies Estimates for Structures with Non-Prismatic Elements". In Numerical Treatment of Eigenvalue Problems Vol.4 / Numerische Behandlung von Eigenwertaufgaben Band 4, 62–76. Basel: Birkhäuser Basel, 1987. http://dx.doi.org/10.1007/978-3-0348-7507-3_6.

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"Prismatic Pentahedron T9: Assumed Displacement Distribution". In Finite Element Structural Analysis: New Concepts, 99–105. Reston ,VA: American Institute of Aeronautics and Astronautics, 2009. http://dx.doi.org/10.2514/5.9781563479991.0099.0105.

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9

"Prismatic Pentahedron T10: Assumed Displacement Distribution plus Corrective Distribution Inside the Element Boundaries". In Finite Element Structural Analysis: New Concepts, 107–17. Reston ,VA: American Institute of Aeronautics and Astronautics, 2009. http://dx.doi.org/10.2514/5.9781563479991.0107.0117.

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"10 MOHR CIRCLE OF STRESS WHEN A PRISMATIC ELEMENT IS SUBJECTED TO NORMAL AND SHEAR STRESSES". In Geotechnical Engineering, 289. CRC Press, 2002. http://dx.doi.org/10.1201/9781482275858-137.

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Atti di convegni sul tema "PRISMATIC ELEMENT"

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Pedreiro, Marcelo R. de Matos, Rogério de O. Rodrigues, Maicon Marino Albertini e Jefferson S. Camacho. "EXPLICIT STIFFNESS MATRIX FOR PARABOLIC PRISMATIC TRIANGULAR ELEMENT". In 10th World Congress on Computational Mechanics. São Paulo: Editora Edgard Blücher, 2014. http://dx.doi.org/10.5151/meceng-wccm2012-20360.

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2

Dwarshuis, Koen, Ronald Aarts, Marcel Ellenbroek e Dannis Brouwer. "A Non-Prismatic Beam Element for the Optimization of Flexure Mechanisms". In ASME 2020 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/detc2020-22242.

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Abstract Flexure joints are rapidly gaining ground in precision engineering because of their predictable behavior. However the range of motion of flexure joints is limited due to loss of support stiffness in deformed configurations. Most of the common flexure joints consist of prismatic leaf springs. This paper presents a simple non-prismatic beam formulation that can be used for the efficient modelling of non-prismatic leaf springs. The resulting stiffness and stress computed by the non-prismatic beam element are compared to the results of a finite element analysis. The paper shows that the support stiffness of two typical flexure joints can be increased up to a factor of 1.9 by using non-prismatic instead of prismatic leaf springs.

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Al-Bedoor, B. O., e Y. A. Khulief. "Finite Element Dynamic Modeling of Elastic Beam With Prismatic Joint". In ASME 1995 Design Engineering Technical Conferences collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/detc1995-0080.

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Abstract A finite element dynamic model of a translating beam through a prismatic joint is presented. The method adopts a fixed number of elements. The element length, on the contrary to the previously reported models, is constant. The time dependent nature of the boundary conditions is utilized to impose the prismatic joint constraints by varying the stiffness of the transition element. This method preserves all the dynamic coupling terms between the axial rigid body motion and the elastic deformations. The end mass dynamics is conveniently considered in the formulation. Furthermore, the introduced dynamic model offers a convenient formulation that can be incorporated into a general flexible multibody dynamics code and lends itself for control applications. The developed model is evaluated through comparisons with previously reported results of other models.

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Cosby, Austin, e Ernesto Gutierrez-Miravete. "Finite Element Analysis Conversion Factors for Natural Vibrations of Beams". In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-37261.

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The objective of this paper is to present results of a study designed to determine conversion factors to allow designers and analysts calculate natural frequencies of vibrating prismatic beams of arbitrary dimensions using simpler beam elements instead of expensive 3D solid elements. Prismatic beams subject to the most commonly encountered boundary conditions were modeled using beam elements and solid elements. The resulting natural frequencies were calculated and validated and the corresponding conversion factors were determined.

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Yamaguchi, Tadashi, Yoshihiro Kawase, Shunsuke Hori e Yoshiki Iwai. "3-D parallel finite element method with prismatic edge elements for dynamic analysis of electromagnets". In 2015 18th International Conference on Electrical Machines and Systems (ICEMS). IEEE, 2015. http://dx.doi.org/10.1109/icems.2015.7385179.

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Migliaccio, G. "Stress and strain fields in non-prismatic inhomogeneous beams". In AIMETA 2022. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902431-27.

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Abstract. Beamlike structures are commonly studied via 1D beam models, which are more efficient than 3D finite element methods, but do not permit accurate predictions of 3D stresses in non-prismatic cases. Despite the progress made in their modeling, either via direct 1D approaches or dimensional reductions from 3D formulations, the accurate analytical prediction of stresses and strains in beamlike yet 3D elements, with non-uniform properties both in terms of materials and cross-section shape, subject to large displacements, is an open problem. This work presents a model for such elements that is particularly suitable for efficient numerical implementations and that allows accurate analytical predictions of stresses and strains. A paradigmatic example shows the importance of non-trivial stress terms that are absent in prismatic homogeneous elements and the inadequacy of usual beam models and stepped-beam approaches when dealing with predictions of stresses and strains in non-prismatic inhomogeneous cases.

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Mocera, Francesco, Elena Vergori e Aurelio Soma. "Finite element versus experimental Thermo-mechanical behaviour of prismatic Li-Ion cell". In 2019 Fourteenth International Conference on Ecological Vehicles and Renewable Energies (EVER). IEEE, 2019. http://dx.doi.org/10.1109/ever.2019.8813653.

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Amor-Martin, Adrian, Daniel Garcia-Donoro e Luis E. Garcia-Castillo. "Analysis of dispersion error of higher-order curl-conforming prismatic finite element". In 2017 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO). IEEE, 2017. http://dx.doi.org/10.1109/nemo.2017.7964234.

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Sitaram, Pattabhi, Bipin Pai e Rachel Mok. "Elasto-Plastic Analysis of Prismatic Folded Plates by the Finite Element Method". In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88195.

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Folded plate structures are used for roofing large column-free areas for auditoriums, supermarkets, gymnasiums, hangars for aircraft, and other similar applications. The loads on these structures could cause stresses to go beyond the elastic range. Therefore, a thorough understanding of their elasto-plastic behavior is of utmost importance in designing these structures. An attempt is made to study the elasto-plastic behavior of prismatic metal folded plates by the finite element method using the commercial software, ANSYS. The method is first validated by analyzing typical plates and shells, and comparing them with available solutions in the literature. The elasto-plastic behavior of some prismatic folded plates is then studied, and their force-deflection responses and evolution of plastic zones are evaluated.

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Pandya, S., e M. Hafez. "A finite-element approach for modeling inviscid and viscous compressible flows using prismatic grids". In 14th Computational Fluid Dynamics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1999. http://dx.doi.org/10.2514/6.1999-3310.

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Rapporti di organizzazioni sul tema "PRISMATIC ELEMENT"

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Beckett-Brown, C. E., A. M. McDonald e M. B. McClenaghan. Discovering a porphyry deposit using tourmaline: a case study from Yukon. Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/331349.

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Abstract (sommario):

As the exploration for porphyry Cu-Au-Mo deposits has become increasingly challenging, the development of more effective techniques directed at detecting buried deposits has become critical. One methodology is to focus on key minerals, one of which is tourmaline, a robust, ubiquitous mineral in most mineralized porphyry systems. Overall, a combination of physical and chemical characteristics including 1) macro-color, 2) morphology, 3) inclusion populations, and 4) trace-element compositions are useful in discriminating between porphyry- versus non-porphyry-derived (or related) tourmaline in surficial sediments (Beckett-Brown 2022). These features are applied to tourmaline obtained from stream sediment samples (n = 22) from 16 streams derived from the unglaciated terrain proximal to the Casino calc-alkaline porphyry Cu-Au-Mo deposit (Yukon Territory, Canada). The obtained tourmaline occurs as two distinct morphologies: 1) individual blocky to prismatic sub- to euhedral grains (Type 1), 2) aggregates of radiating prismatic to acicular sub- to euhedral grains (Type 2). Type 1 grains display trace-element contents that reflect mixed origins including a mineralized porphyry origin as well metamorphic and pegmatitic (background) environments. Type 2 grains almost exclusively exhibit porphyry-derived trace-element chemistries (i.e., high Sr/Pb ~150 avg. and relatively low Zn/Cu ~2.5 avg. values). In Canadian Creek, that directly drains from the Casino deposit, samples closest to the deposit contain &gt;70% porphyry-derived tourmaline, while other streams in the region from unprospective drainage basins contain no porphyry-derived tourmaline. At the most distal sample site in Canadian Creek, ~20 km downstream from Casino, nearly 30% of the recovered tourmaline in the stream sediments is porphyry-related. This method has potential to be a strong indicator of prospectivity and applicable for exploration for porphyry Cu-Au-Mo systems in both unglaciated and glaciated terrains.

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