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Academic literature on the topic 'Method of deformable configurations'

Author: Grafiati

Published: 30 May 2022

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Journal articles on the topic "Method of deformable configurations"

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Liu, S. Charles, and S. Jack Hu. "Sheet Metal Joint Configurations and Their Variation Characteristics." Journal of Manufacturing Science and Engineering 120, no. 2 (May 1, 1998): 461–67. http://dx.doi.org/10.1115/1.2830147.

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In sheet metal assembly, joints are designed to facilitate welding the parts. The three basic joints used in sheet metal assemblies are lap (slip) joints, butt joints, and butt-lap (corner) joints. Each joint configuration has its own variation characteristics. However, the currently available variation analysis methods, such as worst case analysis, root sum squares, etc., are not applicable to deformable sheet metal because they are based on rigid bodies. This paper analyzes the variation characteristics of simple assemblies constructed from the three basic joints, using Mechanistic Variation Simulation. Mechanistic Variation Simulation combines engineering structural models with statistical analysis in predicting deformable sheet metal assembly variation. Furthermore, the variation characteristics of the boxes constructed from the three basic joints are also evaluated. The developed models and analysis provide an improved understanding of sheet metal product design and process design.

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Chang, C. W., and A. A. Shabana. "Spatial Dynamics of Deformable Multibody Systems With Variable Kinematic Structure: Part 1—Dynamic Model." Journal of Mechanical Design 112, no. 2 (June 1, 1990): 153–59. http://dx.doi.org/10.1115/1.2912587.

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In this paper a method for the spatial kinematic and dynamic analysis of deformable multibody systems that are subject to topology changes is presented. A pieced interval analysis scheme that accounts for the change in the spatial system topology due to the changes in the connectivity between bodies is developed. Deformable bodies in the system are discretized using the finite element method and accordingly a finite set of deformation modes is employed to characterize the system vibration. Even though there are infinitely many arrangements for deformable body axes, computational difficulties may be encountered due to the use of a limited number of deformation modes. Therefore, the deformable body references have to be carefully selected, and accordingly as the system topology changes, new bases for the configuration space have to be identified. In order to guarantee a smooth transition from one configuration space to another, a set of spatial interface conditions or compatibility conditions that are formulated using a set of nonlinear algebraic equations are developed and solved in this paper. The solution of these equations uniquely define the spatial configuration of the deformable multibody system after the change in the system kinematic structure.

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Leal, Pedro BC, Marcelo A. Savi, and Darren J. Hartl. "Aero-structural optimization of shape memory alloy-based wing morphing via a class/shape transformation approach." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 232, no. 15 (July 12, 2017): 2745–59. http://dx.doi.org/10.1177/0954410017716193.

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Because of the continuous variability of the ambient environment, all aircraft would benefit from an in situ optimized wing. This paper proposes a method for preliminary design of feasible morphing wing configurations that provide benefits under disparate flight conditions but are also each structurally attainable via localized active shape change operations. The controlled reconfiguration is accomplished in a novel manner through the use of shape memory alloy embedded skin components. To address this coupled optimization problem, multiple sub-optimizations are required. In this work, the optimized cruise and landing airfoil configurations are determined in addition to the shape memory alloy actuator configuration required to morph between the two. Thus, three chained optimization problems are addressed via a common genetic algorithm. Each analysis-driven optimization considers the effects of both the deformable structure and the aerodynamic loading experienced by the wing. Aerodynamic considerations are addressed via a two-dimensional panel method and each airfoil shape is generated by the so-called class/shape transformation methodology. It is shown that structurally and aerodynamically feasible morphing of a modern high-performance sailplane wing produces a 22% decrease in weight and significantly increases stall angle of attack and lift at the same landing velocity when compared to a baseline design that employs traditional control surfaces.

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Liu, S. C., S. J. Hu, and T. C. Woo. "Tolerance Analysis for Sheet Metal Assemblies." Journal of Mechanical Design 118, no. 1 (March 1, 1996): 62–67. http://dx.doi.org/10.1115/1.2826857.

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Traditional tolerance analyses such as the worst case methods and the statistical methods are applicable to rigid body assemblies. However, for flexible sheet metal assemblies, the traditional methods are not adequate: the components can deform, changing the dimensions during assembly. This paper evaluates the effects of deformation on component tolerances using linear mechanics. Two basic configurations, assembly in series and assembly in parallel, are investigated using analytical methods. Assembly sequences and multiple joints beyond the basic configurations are further examined using numerical methods (with finite element analysis). These findings constitute a new methodology for the tolerancing of deformable parts.

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Furman, B. J. "A New, Thermally Controlled, Non-Contact Rotor Balancing Method." Journal of Mechanical Design 116, no. 3 (September 1, 1994): 823–32. http://dx.doi.org/10.1115/1.2919456.

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Available alternative rotor balancing techniques applied to rotors manufactured in high volumes often have productivity limitations. A new method has been devised that allows a rotor to be balanced as it rotates, without physical contact. The method accomplishes balance correction by means of deformable torsion elements that permanently relocate discrete masses through local heating under the action of centrifugal forces. The method exploits the elevated temperature, time-dependent deformation behavior of metallic materials under stress to produce controlled incremental deformation through radiative pulse heating. The important aspects of the new method: the physical configuration of the deformable elements, the non-contact, local heating method, and the method of producing controlled incremental deformation of the mass relocation element have been modeled analytically and demonstrated experimentally.

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Manga, Michael, and H. A. Stone. "Buoyancy-driven interactions between two deformable viscous drops." Journal of Fluid Mechanics 256 (November 1993): 647–83. http://dx.doi.org/10.1017/s0022112093002915.

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Time-dependent interactions between two buoyancy-driven deformable drops are studied in the low Reynolds number flow limit for sufficiently large Bond numbers that the drops become significantly deformed. The first part of this paper considers the interaction and deformation of drops in axisymmetric configurations. Boundary integral calculations are presented for Bond numbers ℬ = Δρga2/σ in the range 0.25 ≤ ℬ < ∞ and viscosity ratios λ in the range 0.2 ≤ λ ≤ 20. Specifically, the case of a large drop following a smaller drop is considered, which typically leads to the smaller drop coating the larger drop for ℬ [Gt ] 1. Three distinct drainage modes of the thin film of fluid between the drops characterize axisymmetric two-drop interactions: (i) rapid drainage for which the thinnest region of the film is on the axis of symmetry, (ii) uniform drainage for which the film has a nearly constant thickness, and (iii) dimple formation. The initial mode of film drainage is always rapid drainage. As the separation distance decreases, film flow may change to uniform drainage and eventually to dimpled drainage. Moderate Bond numbers, typically ℬ = O(10) for λ = O(1), enhance dimple formation compared to either much larger or smaller Bond numbers. The numerical calculations also illustrate the extent to which lubrication theory and analytical solutions in bipolar coordinates (which assume spherical drop shapes) are applicable to deformable drops.The second part of this investigation considers the 'stability’ of axisymmetric drop configurations. Laboratory experiments and two-dimensional boundary integral simulations are used to study the interactions between two horizontally offset drops. For sufficiently deformable drops, alignment occurs so that the small drop may still coat the large drop, whereas for large enough drop viscosities or high enough interfacial tension, the small drop will be swept around the larger drop. If the large drop is sufficiently deformable, the small drop may then be ‘sucked’ into the larger drop as it is being swept around the larger drop. In order to explain the alignment process, the shape and translation velocities of widely separated, nearly spherical drops are calculated using the method of reflections and a perturbation analysis for the deformed shapes. The perturbation analysis demonstrates explicitly that drops will tend to be aligned for ℬ > O(d/a) where d is the separation distance between the drops.

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Ramirez-Alpizar, Ixchel G., Kensuke Harada, and Eiichi Yoshida. "A simple assembly planner for the insertion of ring-shaped deformable objects." Assembly Automation 38, no. 2 (April 3, 2018): 182–94. http://dx.doi.org/10.1108/aa-12-2016-181.

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Purpose The aim of this work is to develop a simple planner that is able to automatically plan the motion for a dual-arm manipulator that assembles a ring-shaped elastic object into a cylinder. Moreover, it is desirable to keep the amount of deformation as small as possible, because stretching the object can permanently change its size thus failing to perfectly fit in the cylindrical part and generating undesired gaps between the object and the cylinder. Design/methodology/approach The assembly task is divided in two parts: assembly task planning and assembly step planning. The first one computes key configurations of the robot’s end-effectors, and it is based on a simple heuristic method, whereas the latter computes the robot’s motion between key configurations using an optimization-based planner that includes a potential-energy-based cost function for minimizing the object’s deformation. Findings The optimization-based planner is shown to be effective for minimizing the deformation of the ring-shaped object. A simple heuristic approach is demonstrated to be valid for inserting deformable objects into a cylinder. Experimental results show that the object can be kept without deformation for the first part of the assembly task, thus reducing the time it is being stretched. Originality value A simple assembly planner for inserting ring-shaped deformable objects was developed and validated through several experiments. The proposed planner is able to insert ring-shaped objects without using any sensor (visual and/or force) feedback. The only feedback used is the position of the robot’s end-effectors, which is usually available for any robot.

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Ady, Bridget E., and Richard C. Whittaker. "Examining the influence of tectonic inheritance on the evolution of the North Atlantic using a palinspastic deformable plate reconstruction." Geological Society, London, Special Publications 470, no. 1 (March 19, 2018): 245–64. http://dx.doi.org/10.1144/sp470.9.

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AbstractTo accurately reconstruct plate configurations, there is a need for a quantitative method to calculate the amount and timing of crustal extension independent of any one model for the formation of rifted margins. This paper evaluates the suitability of the various plate modelling methods for structural inheritance studies and proposes a classification scheme for the methods that are currently in use. A palinspastic deformable margin plate kinematic model is most suitable for tectonic inheritance studies, particularly at hyperextended margins. This type of plate model provides a valuable analytical tool that can be used to show the temporal and spatial relationship between pre-existing orogenic structures, evolving rift axes and global plate reorganization events. We use a palinspastic deformable margin plate model for the southern North Atlantic and Labrador Sea to quantitatively restore up to 350 km of Mesozoic–Cenozoic extension. This provides us with a pre-rift restoration of the Proterozoic and Paleozoic terranes and structural lineaments on the conjugate margins that helps us to analyse their relationship to evolving rift axes and global plate reorganization events through time. Interpretation of these modelling results has led to a clearer understanding of the relationship between inherited structural features and their control on rifting and the break-up history.

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LI, WEIXIN, HAIJIE DONG, ZHENSHENG YUAN, and ZHENMAO CHEN. "NUMERICAL ANALYSIS OF ELECTROMAGNETO-MECHANICAL COUPLING USING LAGRANGIAN APPROACH AND ADAPTIVE TIME STEPPING METHOD." International Journal of Applied Mechanics 06, no. 05 (October 2014): 1450051. http://dx.doi.org/10.1142/s1758825114500513.

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Electromagneto-mechanical coupling effect associated with vibration induced eddy currents plays an important role in the evaluation and design of many magnetic devices, such as a tokamak. In this paper, a updated Lagrangian formulation for eddy current analysis of deformable bodies was presented through transformation from reference configuration to current configuration. A coupled analysis method based on Lagrangian meshes and Ar method was developed. A corresponding code was developed and verified by simulating Team Problem 16. The numerical method was further updated by introducing an adaptive time stepping procedure to improve its simulation efficiency.

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Min, Ling Kun, Zhi Zheng Wu, and Mei Liu. "Silver Liquid-Like Film Prepared by Self-Assembly for Magnetic Fluid Deformable Mirrors." Advanced Materials Research 1120-1121 (July 2015): 337–42. http://dx.doi.org/10.4028/www.scientific.net/amr.1120-1121.337.

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In this paper, a variety of methods to prepare nanometer thin films, such as LB film method, self-assembly method, vapor deposition method and oil-water two-phase interface deposition method, are first introduced and compared. Then the self-assembly method is used to prepare the silver liquid-like film for the magnetic fluid deformable mirror. The basic principle of configuration of the silver thin films is discussed and a large area of ordered and close-packed multilayer structures of encapsulated silver nanoparticles is fabricated. The results showed that the film has good reflectivity and stability.

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Dissertations / Theses on the topic "Method of deformable configurations"

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Загородня, Тетяна Миколаївна. "Моделі та інформаційна технологія забезпечення компетентності випускників вищого навчального закладу з урахуванням вимог роботодавця." Thesis, Сумський державний університет, 2015. http://repository.kpi.kharkov.ua/handle/KhPI-Press/18188.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.13.06 – інформаційні технології. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2015. У дисертаційній роботі вирішена актуальна науково-практична задача обґрунтування та розробки інформаційної технології забезпечення компетентності випускників ВНЗ з урахуванням вимог роботодавця до компетентності фахівців. Проаналізовано наукові досягнення в області підвищення ефективності навчання з урахуванням модульної системи і компетентісного підходу, сформульовано основні вимоги до інформаційної системи підтримки прийняття рішень для викладацького складу з метою вдосконалення процесу навчання студентів технічних спеціальностей, зокрема, майбутніх інженерів. Створено математичну модель представлення компетентності студентів як складної агрегованої характеристики. Розроблено модель багатокритеріальної оптимізації параметрів навчального процесу, яка дозволяє максимізувати функцію компетентності. Розроблено і впроваджено відповідну інформаційну технологію підтримки прийняття рішень, яка дозволяє проводити оптимізацію процесу навчання студентів технічних спеціальностей задля підвищення їхньої компетентності, що відповідає вимогам роботодавців. Здійснено оптимізацію параметрів навчального процесу для студентів заочної форми навчання, які вивчають дисципліну "Теоретичні основи електротехніки", що дозволяє підвищити сформований рівень компетентності на 20-35 %. Результати впроваджено та використано під час організації навчального процесу у провідних закладах вищої освіти України.

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Загородня, Тетяна Миколаївна. "Моделі та інформаційна технологія забезпечення компетентності випускників вищого навчального закладу з урахуванням вимог роботодавця." Thesis, НТУ "ХПІ", 2015. http://repository.kpi.kharkov.ua/handle/KhPI-Press/18178.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.13.06 – інформаційні технології. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2015. У дисертаційній роботі вирішена актуальна науково-практична задача обґрунтування та розробки інформаційної технології забезпечення компетентності випускників ВНЗ з урахуванням вимог роботодавця до компетентності фахівців. Проаналізовано наукові досягнення в області підвищення ефективності навчання з урахуванням модульної системи і компетентісного підходу, сформульовано основні вимоги до інформаційної системи підтримки прийняття рішень для викладацького складу з метою вдосконалення процесу навчання студентів технічних спеціальностей, зокрема, майбутніх інженерів. Створено математичну модель представлення компетентності студентів як складної агрегованої характеристики. Розроблено модель багатокритеріальної оптимізації параметрів навчального процесу, яка дозволяє максимізувати функцію компетентності. Розроблено і впроваджено відповідну інформаційну технологію підтримки прийняття рішень, яка дозволяє проводити оптимізацію процесу навчання студентів технічних спеціальностей задля підвищення їхньої компетентності, що відповідає вимогам роботодавців. Здійснено оптимізацію параметрів навчального процесу для студентів заочної форми навчання, які вивчають дисципліну "Теоретичні основи електротехніки", що дозволяє підвищити сформований рівень компетентності на 20-35 %. Результати впроваджено та використано під час організації навчального процесу у провідних закладах вищої освіти України.
Thesis for a Candidate Degree in Technical Sciences, Specialty 05.13.06 – Information technologies. – National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2015. In the dissertation the relevant scientific and practical problem is solved, which is related to study and development of information technology for ensuring competencies of graduates to meet the requirements of the employer for the competence of professionals. Scientific achievements in the field of improving of learning efficiency based on a modular system and the competence approach were analyzed. The basic requirements to decision support information system for teaching staff were formulated in order to improve the learning process of students of technical specialties, including future engineers. A mathematical model of competence representation as a complex aggregated characteristic was created. The model of multicriteria optimization of the parameters of learning process was developed, which allows to maximize the competence function. The decision support information technology was developed and deployed. It allows to optimize the learning process of students of technical specialties for improvement of their competence and satisfaction of employers requirements. The optimization of parameters of learning process for students of low residence education was performed. It was done for discipline «Theoretical Foundations of Electrical Engineering» and allowed to increase the level of competence by 20–35 %. The results were used for organization of learning process in leading universities of Ukraine.

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Yang, Baofen. "Geometric deformable models using the level set method." Mémoire, Université de Sherbrooke, 2005. http://savoirs.usherbrooke.ca/handle/11143/4664.

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Geometric deformable models for active contours have brought tremendous impact to classical problems in image processing such as providing ways to devise efficient computational algorithms for automatic segmentation. This is achieved by using the level set method, which allows handling automatic changes in topology while providing a framework for very fast numerical schemes. However, topological flexibility is not desired when an object with known topology is sought. It is natural to capture the target in a way that gives the correct topology. A geometric deformable model with topology preserving is developed that can guarantee the topology will be preserved while all the computational advantages of the level set approach are maintained. A key issue in object detection using the shape of the object’s boundary and surface reconstruction using slice contours is the ability to identify the complete boundaries of the segmented objects in the scene. The segmentation results provided by geometric deformable models are usually dependent on the contour initialization, and in most cases, the results of the segmentation will only provide partial objects boundaries. A new method based on digital topology is proposed to detect the complete boundary information of the segmented objects. By carrying out a topological analysis of the objects, this method can provide the right initialization that can capture all the boundaries of the objects in certain cases.

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MUKHERJEE, NANDINI. "3D DEFORMABLE CONTOUR SURFACE RECONSTRUCTION: AN OPTIMIZED ESTMATION METHOD." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1078255615.

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Hazarika, Neep. "An inverse method for blended wing-body configurations." Diss., Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/12498.

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Zhang, Kejun. "3D image applications of a 2D constrained deformable contour method." Cincinnati, Ohio : University of Cincinnati, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=ucin1092408492.

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Li, Ziyun. "Haptic Dissection of Deformable Objects using Extended Finite Element Method." Thesis, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31445.

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Interactive dissection simulation is an important research topic in the virtual reality (VR) community. There are many efforts on this topic; however, most of them focus on building a realistic simulation system regardless of the cost, and they often require expensive workstations and specialized haptic devices which prevent broader adoption. We show how to build a realistic dissection simulation at an affordable cost, which opens up applications in elementary education for virtual dissections which are currently not feasible. In this thesis, we present a fast and robust haptic system for interactive dissection simulations of finite elements based deformable objects which supports two type of haptic interactions: point contacts and cuts. We design a semi-progressive virtual dissection scheme of deformable objects in a real-time application. The quality and performance of visual/haptic feedback is demonstrated on a low-end commercial desktop PC with a haptic device.

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ZHANG, KEJUN. "3D MEDICAL IMAGE APPLICATIONS OF A 2D CONSTRAINED DEFORMABLE CONTOUR METHOD." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1092408492.

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Arrou-Vignod, Pierre. "Simultaneous modal adjustment of multiple aircraft configurations using an optimization method." Thesis, KTH, Lättkonstruktioner, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-234839.

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When designing an airplane, it is necessary to know precisely the vibration modes of the structure. To do so, the Finite Element model of the airplane is adjusted to ground vibration tests results using optimization. Particularly, for airplanes able to carry several external payloads, this adjustment process must be performed for all payloads configurations. In this Master Thesis, the possibility of adjusting simultaneously different airplane configurations to their respective tests results is explored. Such a method ensures that the final Finite Element model is the same in all configurations. After implementation in the company’s software, this method is subsequently tested over two configurations. The results obtained are compared to those from separate adjustment of the models with the same variable parameters. Comparison shows that simultaneous model adjustment is promising. A better choice of variable parameters is required to improve results.
Vid konstruktion av flygplan är det nödvändigt att kunna beräkna egensvängningsformer och egenfrekvenser för strukturen. För att göra detta anpassas ett flygplans finita element-modell till vibrationstestresultat med hjälp av optimering. Speciellt för flygplan som kan bära flera uppsättningar extern nyttolast måste denna justeringsprocess göras för alla nyttolastkonfigurationer. I detta examensarbete utforskas möjligheten att justera olika flygplanskonfigurationer samtidigt mot deras respektive testresultat. Den här metoden säkerställer att den slutliga finita element-modellen är identisk för alla konfigurationer. Efter genomförandet i företagets program testas metoden på två konfigurationer. Resultaten jämförs med de från separat anpassning av modellerna med samma designparametrar. Jämförelsen visar att samtidigt modelljustering är lovande. Ett bättre val av designparametrar krävs för att förbättra resultaten.

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Le, Moigne Alan. "A discrete Navier-Stokes adjoint method for aerodynamic optimisation of BlendedWing-Body configurations." Thesis, Cranfield University, 2002. http://hdl.handle.net/1826/826.

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An aerodynamic shape optimisation capability based on a discrete adjoint solver for Navier- Stokes flows is developed and applied to a Blended Wing-Body future transport aircraft. The optimisation is gradient-based and employs either directly a Sequential Quadratic Programming optimiser or a variable-fidelity optimisation method that combines low- and high-fidelity models. The shape deformations are parameterised using a B´ezier-Bernstein formulation and the structured grid is automatically deformed to represent the design changes. The flow solver at the heart of this optimisation chain is a Reynolds averaged Navier- Stokes code for multiblock structured grids. It uses Osher’s approximate Riemann solver for accurate shock and boundary layer capturing, an implicit temporal discretisation and the algebraic turbulence model of Baldwin-Lomax. The discrete Navier-Stokes adjoint solver based on this CFD code shares the same implicit formulation but has to calculate accurately the flow Jacobian. This implies a linearisation of the Baldwin-Lomax model. The accuracy of the resulting adjoint solver is verified through comparison with finitedifference. The aerodynamic shape optimisation chain is applied to an aerofoil drag minimisation problem. This serves as a test case to try and reduce computing time by simplifying the fidelity of the model. The simplifications investigated include changing the convergence level of the adjoint solver, reducing the grid size and modifying the physical model of the adjoint solver independently or in the entire optimisation process. A feasible optimiser and the use of a penalty function are also tested. The variable-fidelity method proves to be the most ef- ficient formulation so it is employed for the three-dimensional optimisations in addition to parallelisation of the flow and adjoint solvers with OpenMP. A three-dimensional Navier- Stokes optimisation of the ONERA M6 wing is presented. After describing the concept of Blended Wing-Body and the studies carried out on this aircraft, several aerodynamic optimisations are performed on this geometry with the capability developed in this thesis.

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Books on the topic "Method of deformable configurations"

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Dale, Bryan Richard. A shear deformable finite element for laminated plates. [Downsview, Ont.]: Dept. of Aerospace Science and Engineering, 1987.

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Bazhlekov, Ivan Blagoev. Non-singular boundary-integral method for deformable drops in viscous flows. Eindhoven: Technische Universiteit Eindhoven, 2003.

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Ueda, Tetsuhiko. Unsteady aerodynamic calculations for general configurations by the doublet-point method. Tokyo, Japan: National Aerospace Laboratory, 1991.

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Barger, Raymond L. A method for designing blended wing-body configurations for low wave drag. [Washington, DC]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1992.

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Hounjet, M. H. L. ARSPNSC: A method to calculate subsonic steady and unsteady potential flow about complex configurations. Amsterdam: National Aerospace Laboratory, 1986.

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Uosukainen, Seppo. JMC method applied to active control of sound: Theoretical extensions and new source configurations. Espoo [Finland]: Technical Research Centre of Finland, 1999.

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Obeid, Amneh Abdullah Ahmed. Magnet implant system configurations: A method of optimising the effeciency of complete mandibular overdentures. Birmingham: University of Birmingham, 1997.

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Gordon, Royle, and Whittle Geoff 1950-, eds. The internally 4-connected binary matroids with no M(K3,3)-minor. Providence, R.I: American Mathematical Society, 2010.

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Hounjet, M. H. L. CAR 88: A method to calculate subsonic and supersonic, steady and unsteady, potential flow about complex configurations. Amsterdam: National Aerospace Laboratory, 1988.

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1961-, Joskowicz Leo, ed. The configuration space method for kinematic design of mechanisms. Cambridge, Mass: MIT Press, 2010.

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Book chapters on the topic "Method of deformable configurations"

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Qu, Yingge, Tien-Tsin Wong, and Pheng Ann Heng. "Image Segmentation Using The Level Set Method." In Deformable Models, 95–122. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-68343-0_4.

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Mikula, Karol, and Alessandro Sarti. "Parallel Co-Volume Subjective Surface Method For 3d Medical Image Segmentation." In Deformable Models, 123–60. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-68343-0_5.

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Huang, Yongzhen, Kaiqi Huang, and Tieniu Tan. "A Heuristic Deformable Pedestrian Detection Method." In Computer Vision – ACCV 2010, 542–53. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-19309-5_42.

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ElTanboly, Ahmed, Ali Mahmoud, Ahmed Shalaby, Magdi El-Azab, Mohammed Ghazal, Robert Keynton, Ayman El-Baz, and Jasjit S. Suri. "Deformable Models and Image Segmentation." In Level Set Method in Medical Imaging Segmentation, 207–60. Boca Raton : Taylor & Francis, 2019.: CRC Press, 2019. http://dx.doi.org/10.1201/b22435-8.

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Mecke, R., and B. Michaelis. "A Robust Method for Motion Estimation in Image Sequences." In Articulated Motion and Deformable Objects, 108–19. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/10722604_10.

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Choraś, Michal. "Ear Biometrics Based on Geometrical Method of Feature Extraction." In Articulated Motion and Deformable Objects, 51–61. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-30074-8_7.

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Ovsiannikov, Mikhail, Sergey A. Bukhanov, and Sergey A. Podkopaev. "Method of Managing Configurations of Engineering Systems." In Advances in Intelligent Systems and Computing, 418–26. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-68004-6_55.

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Deryugin, Ye Ye, G. V. Lasko, and Siegfried Schmauder. "Relaxation Element Method in Mechanics of Deformable Solid." In Handbook of Mechanics of Materials, 1503–64. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-10-6884-3_30.

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Deryugin, Ye Ye, G. V. Lasko, and S. Schmauder. "Relaxation Element Method in Mechanics of Deformable Solid." In Handbook of Mechanics of Materials, 1–62. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-6855-3_30-1.

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Oliveros, Eloy Rafael, Grethel Coello, Pedro Marrero-Fernández, Jose Maria Buades, and Antoni Jaume-i-Capó. "Evaluation of K-SVD Method in Facial Expression Recognition Based on Sparse Representation Problems." In Articulated Motion and Deformable Objects, 135–46. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-41778-3_14.

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Conference papers on the topic "Method of deformable configurations"

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Iaccarino, Gianluca, Sangjin Lee, Jungchan Kim, and Youngho Ju. "Towards a Flexible Immersed Boundary Method for Fluid/Structure Interactions in Turbomachinery Applications." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-56801.

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The Immersed Boundary method is implemented in an unstructured-grid, compressible Reynolds averaged Navier-Stokes solver to perform fluid/structure interaction simulations in a turbo machinery configurations. The implementation enables the use of locally refined meshes and general streamlined grids to capture highly curved components and non-Cartesian configurations typical of turbomachinery components. The coupling between fluid solver and a stand-alone structure based solver is based on a fully implicit procedure and is validated by comparisons to existing results on simple rigid and deformable cylinders configurations. Initial applications of the method to aeroelastic computations of the NASA Rotor 67 configuration are also reported.

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Arisoy, Erhan Batuhan, and Levent Burak Kara. "Topology Preserving Digitization of Physical Prototypes Using Deformable Subdivision Models." In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-34390.

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Physical prototyping is an important stage of product design where designers have a chance to physically evaluate and alter digitally created surfaces. In these scenarios, designers generate a digital model, manufacture and alter the prototype as needed, and redigitize the prototype through scanning. Despite the variety of reverse engineering tools, redigitizing the prototypes into forms amenable to further digital editing remains a challenge. This is because current digitization methods cannot take advantage of the key elements of the original digital model such as the wireframe topology and surface flows. This paper presents a new reverse engineering method that augments conventional digitization with the knowledge of the original digital model’s curve topology to enhance iterative shape design activities. Our algorithm takes as input a curve network topology forming a subdivision control cage and a 3D scan of the physically modified prototype. To facilitate the digital capture of the physical modifications, our algorithm performs a series of registration, correspondence and deformation calculations to compute the new configuration of the initial control cage. The key advantage of the proposed technique is the preservation of the edge flows and initial topology while transferring surface modifications from prototypes. Our studies show that the proposed technique can be particularly useful for bridging the gap between physical and digital modeling in the early stages of product design.

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Xie, L. Shelley, and Agus Sudjianto. "Optimal Robust Fixture Configuration Design Using Computer Experiment." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-42628.

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A new FEA based design approach of optimal robust fixture configuration is proposed in this paper, which employs a surrogate model through computer experiment to significantly reduce the intensive computing effort involving numerous FEA system response evaluations. The effects of the fixture variability to the workpiece performance variability are assessed through an efficient robustness evaluation method, First Order Reliability Method (FORM), based on the surrogate computer model. Not restricted to primary datum surface, this new approach enables simultaneous determination of robust locator/clamp locations and clamping forces for a deformable workpiece and thus captures interaction between locating and clamping. The effectiveness of this approach is illustrated though an application example. The results of robustness analysis reveal new information and suggest that the optimal solution resulted from deterministic optimization may not be the best solution when the design is subjected to variability.

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Qi, Peng, Hongbin Liu, Lakmal Seneviratne, and Kaspar Althoefer. "Design, Kinematics and Prototype of a Flexible Robot Arm With Planar Springs." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46503.

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Flexible robot arms have been developed for various medical and industrial applications because of their compliant structures enabling safe environmental interactions. This paper introduces a novel flexible robot arm comprising a number of elastically deformable planar spring elements arranged in series. The effects of flexure design variations on their layer compliance properties are investigated. Numerical studies of the different layer configurations are presented and finite Element Analysis (FEA) simulation is conducted. Based on the suspended platform’s motion of each planar spring, this paper then provides a new method for kinematic modeling of the proposed robot arm. The approach is based on the concept of simultaneous rotation and the use of Rodrigues’ rotation formula and is applicable to a wide class of continuum-style robot arms. At last, the flexible robot arms respectively integrated with two different types of compliance layers are prototyped. Preliminary test results are reported.

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Tan, Yan Han, Michel van Rooij, and Bimo Prananta. "Transient Analysis of a Transonic Compressor Rotor With Aeroelastic Effects." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-44023.

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High fidelity aeroelastic analysis of gas turbine blading is becoming increasingly common. It is used in vibration analysis and prevention, to increase accuracy of off-design flow analysis and performance prediction, and in damage investigation. Here, an aeroelastic analysis is performed of the transient response of a transonic rotor to a change in operating point. An existing aeroelastic method is used that was originally developed and validated for aircraft applications. The method consists of a time-accurate CFD-method coupled with a modal approach for geometry deformation. The validity of the aeroelastic method is confirmed using the standard aeroelastic test case STCF4. Next, the transient behavior of a transonic rotor due to a change in operating point is investigated. Two scenarios are analyzed: from design point to near stall, and from design point to near choke conditions. These scenarios were analyzed using time-accurate U-RANS calculations with rigid and deformable blading, using six vibration modes to describe the blade deformation in the latter case. In the case of a rigid blade, the shock quickly moves from the original position to the position associated with the new operating point. The duration of this process is approximately one rotor revolution, but a small oscillatory movement remains after three rotor revolutions. With deformable blading, the changing pressure distribution deforms the blade shape during the transient process. The geometric displacement is very small, on the order of 10 μm, and has only a minor effect on the observed shock movement. The final extent of deformation is reached within 0.5 rotor revolutions, but the blade continues to vibrate after three rotor revolutions. The oscillatory displacements of both the shock and the blade are very small for this particular geometry. For different configurations, the blade deformations might be large enough to influence the shock motion, possibly giving rise to noise and fatigue problems.

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Heshmat, Hooshang, and José Luis Córdova. "A Bladeless Turbocompressor Concept: Shear Driven Gas Compression With Deformable Structures: Part 2 — Operating Principles and Theory." In ASME 2017 Power Conference Joint With ICOPE-17 collocated with the ASME 2017 11th International Conference on Energy Sustainability, the ASME 2017 15th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2017 Nuclear Forum. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/power-icope2017-3375.

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The theory underlying a novel method of gas compression driven by shear flow for next generation turbo-machinery is presented. The concept is based on the conversion of shaft power into hydrodynamic pressure and fluid flow that occur in the shear flow between a smooth rotating disk and a compliant surface counterface. This also holds for the inverse process, where gas expansion through the gap between the compliant surface and a shaft-mounted disk converts gas pressure into rotating power and torque. This is a logical evolutionary step that leverages the proven functionality of self-actuated fluid film compliant foil bearings and seals which operate in the hydrodynamic regime. Thus, as in these devices, the process of compression induced by shear flow is dominated by the balance between pressure and viscous forces which are in turn enhanced and controlled by tribological effects arising between the fluid film and the geometry of the counterface compliant surface. A model based on the compressible Reynolds equation coupled to the thin-plate theory formulation for compliant foil deflection is presented and parametrically solved to predict pressure, flow rate, and shear losses. The smooth disk and four-pad (sectored) compliant counterface effective size (7.6 mm < r < 14.1 mm), disk operating speed (50,000 to 360,000 rpm), nominal initial gap (0.03 mm < h0 < 0.635 mm), and overall operating conditions chosen for the parametric study correspond to those envisioned for eventual practical integration of miniaturized external combustion bladeless gas turbine engines and turbocompressors. Theoretical performance curves reporting flow versus pressure as well as compression power requirements versus speed were obtained. The predictions of the analysis are compared to results obtained experimentally on a proof of concept engine and presented in a companion paper. The simplicity of the bladeless geometry makes it amenable to deployment in multistage configurations, so that in conjunction with its foil bearing predecessors, this novel technology will result in low cost, ultra-high speed, high specific power and power density, high efficiency, oil-free and maintenance-free engines — attractive for many practical applications, ranging from military micro-UAV propulsion and portable power systems, to domestic combined heat and power turboalternators, and even micro-compressors for portable medical devices. As a point of reference, it is anticipated that a 10-stage bladeless compressor based on a compression stage as described herein would have a size comparable to that of a 355 mL soda can delivering a flow of 1 kg/min of compressed air.

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Ebna Hai, Bhuiyan Shameem Mahmood, and Markus Bause. "Finite Element Approximation of Fluid Structure Interaction (FSI) Optimization in Arbitrary Lagrangian-Eulerian Coordinates." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-62291.

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Advanced composite materials such as Carbon Fiber Reinforced Plastics (CFRP) are being applied to many aircraft structures in order to improve performance and reduce weight. Most composites have strong, stiff fibers in a matrix which is weaker and less stiff. However, aircraft wings can break due to Fluid-Structure Interaction (FSI) oscillations or material fatigue. This paper focuses on the analysis of a non-linear fluid-structure interaction problem and its solution in the finite element software package DOpElib: the deal.II based optimization library. The principal aim of this research is to explore and understand the behaviour of the fluid-structure interaction during the impact of a deformable material (e.g. an aircraft wing) on air. Here we briefly describe the analysis of incompressible Navier-Stokes and Elastodynamic equations in the arbitrary Lagrangian-Eulerian (ALE) frameworks in order to numerically simulate the FSI effect on a double wedge airfoil. Since analytical solutions are only available in special cases, the equation needs to be solved by numerical methods. This coupled problem is defined in a monolithic framework and fractional-step-θ time stepping scheme are implemented. Spatial discretization is based on a Galerkin finite element scheme. The non-linear system is solved by a Newton method. The implementation using the software library package DOpElib and deal.II serves for the computation of different fluid-structure configurations.

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Choi, Kyung K., Nam H. Kim, and Mark E. Botkin. "Design Sensitivity Analysis for the Meshfree Shell Structure." In ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/dac-21042.

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Abstract A unified design sensitivity analysis method for a meshfree shell structure with respect to sizing, shape, and configuration design variables is presented in this paper. A shear deformable shell formulation is characterized by a CAD connection, thickness degeneration, meshfree discretization, and nodal integration. The design variable is selected from the CAD parameters, and a consistent design velocity field is then computed by perturbing the surface geometric matrix. The material derivative concept is used to obtain a design sensitivity equation in the parametric domain. Numerical examples show the accuracy and efficiency of the proposed design sensitivity analysis method compared to the analytical solution and the finite difference solution.

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Montalbano, Paul, and Craig Lusk. "Multistable Shape-Shifting Surfaces." In ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-71159.

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This paper presents designs for Multistable Shape-Shifting Surfaces (MSSS) by introducing bistability into the Shape-Shifting Surface (SSS). SSSs are defined as surfaces that retain their effectiveness as a physical barrier while undergoing changes in shape. The addition of bistability to the SSS gives the surface multiple distinct positions in which it remains when shifted to, i.e. by designing bistability into a single SSS link, the SSS unit cell can change into multiple shapes, and stabilize within the resulting shape, while maintaining integrity against various forms of external assaults normal to its surface. Planar stable configurations of the unit cell include, expanded, compressed, sheared, half-compressed, and partially-compressed, resulting in the planar shapes of a large square, small square, rhombus, rectangle, and trapezoid respectively. Tiling methods were introduced which gave the ability to produce out-of-plane assemblies using planar MSSS unit cells. Applications for MSSSs include size-changing vehicle beds, expandable laptop screens, deformable walls, and volume-changing rigid-storage containers. Analysis of the MSSS was done using Pseudo-rigid-Body Models (PRBMs) and Finite Element Analysis (FEA) which ensured bistable characteristics before prototypes were fabricated.

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Hamper, Martin B., Khaled E. Zaazaa, and Ahmed A. Shabana. "Development of the Finite Segment Method for Modeling Railroad Track Structures." In 2011 Joint Rail Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/jrc2011-56099.

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In the finite segment method, the dynamics of a deformable body is described using a set of rigid bodies that are connected by elastic force elements. This approach can be used, as demonstrated in this investigation, in the simulation of some rail movement scenarios. The purpose of this investigation is to develop a new track model that combines the absolute nodal coordinate formulation (ANCF) geometry and the finite segment method. The ANCF finite elements define the track geometry in the reference configuration as well as the change in the geometry due to the movement of the finite segments of the track. Using ANCF geometry and the finite segment kinematics, the location of the wheel/rail contact point is predicted online and used to update the creepage expressions due to the finite segment displacements and rotations. The location of the wheel/rail contact point and the updated creepage expressions are used to evaluate the creep forces. A three-dimensional elastic contact formulation (ECF-A), that allows for wheel/rail separation, is used in this investigation. The rail displacement due to the applied loads is modeled by a set of rigid finite segments that are connected by set of spring-damper elements. Each rail finite segment is assumed to have six rigid body degrees of freedom. The equations of motion of the finite segments are integrated with the railroad vehicle system equations of motion in a sparse matrix formulation. The resulting dynamic equations are solved using a predictor-corrector numerical integration method that has a variable order and variable step size. As shown in this paper, the finite segments may be used to model specific phenomena that occur in railroad vehicle applications, including rail rotations and gage widening. The procedure used in this investigation to implement the finite segment method in a general purpose multibody system (MBS) computer program is described. Four simple models are presented in order to demonstrate the implementation of the finite segment method in MBS algorithms. The limitations of using the finite segments approach for modeling the track structure and rail flexibility are also discussed.

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Reports on the topic "Method of deformable configurations"

1

Evans, K. Jr. A method for determining poloidal coil configurations for tokamak devices. Office of Scientific and Technical Information (OSTI), December 1990. http://dx.doi.org/10.2172/6242831.

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Bigl, Matthew, Samuel Beal, and Charles Ramsey. Determination of residual low-order detonation particle characteristics from IMX-104 mortar rounds. Engineer Research and Development Center (U.S.), September 2021. http://dx.doi.org/10.21079/11681/42163.

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The environmental fate and transport of energetic compounds on military training ranges are largely controlled by the particle characteristics of low-order detonations. This study demonstrated a method of command detonation, field sampling, laboratory processing, and analysis techniques for characterizing low-order detonation particles from 60 mm and 81 mm mortar rounds containing the insensitive munition formulation IMX-104. Particles deposited from three rounds of each caliber were comprehensively sampled and characterized for particle size, energetic purity, and morphology. The 60 mm rounds were command-detonated low order consistently (seven low-order detonations of seven tested rounds), with con-sumption efficiencies of 62%–80% (n = 3). The 81 mm rounds detonated low order inconsistently (three low-order detonations of ten tested rounds), possibly because the rounds were sourced from manufacturing test runs. These rounds had lower consumption efficiencies of 39%–64% (n = 3). Particle-size distributions showed significant variability between munition calibers, between rounds of the same caliber, and with distance from the detonation point. The study reviewed command-detonation configurations, particle transfer losses during sampling and particle-size analysis, and variations in the energetic purity of recovered particles. Overall, this study demonstrated the successful characterization of IMX-104 low-order detonation particles from command detonation to analysis.

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