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Relevant bibliographies by topics / Coupler curves

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Academic literature on the topic 'Coupler curves'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Coupler curves"

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Unruh, V., and P. Krishnaswami. "A Computer-Aided Design Technique for Semi-Automated Infinite Point Coupler Curve Synthesis of Four-Bar Linkages." Journal of Mechanical Design 117, no. 1 (March 1, 1995): 143–49. http://dx.doi.org/10.1115/1.2826099.

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At the present time, there are no satisfactory computer-aided solution schemes for solving the infinite point coupler curve synthesis problem (i.e., the problem of synthesizing a four-bar linkage whose coupler curve best approximates a fully specified closed trajectory). In order to develop a programmable solution process for this class of problems, it is necessary to devise a way of storing a catalog of coupler curves in a computer database. In addition, comparison procedures must be developed for detecting geometric similarities between curves; these procedures must be capable of observing similarities in the shapes of curves which may be scaled or oriented differently. In this paper, a data representation scheme based on uniform periodic B-splines is proposed as a viable means of storing coupler curves in a database. Automated procedures for fitting B-splines to coupler cures or other closed curves are also developed. The paper also presents a set of algorithms for comparing the shapes of curves based on the control polygons of their B-spline approximations. These algorithms are implemented in a computer program that is an effective tool for semi-automated computer-aided solution of the infinite point coupler curve synthesis problem. Example problems solved using this program are discussed, along with some suggestions for further work on this topic.

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Lu, Deng-Maw, and Wen-Miin Hwang. "Synthesis of Spherical Four-Bar Mechanisms for Two or Three Prescribed Coupler-Curve Cusps." Journal of Mechanical Design 123, no. 2 (February 1, 2000): 247–53. http://dx.doi.org/10.1115/1.1360185.

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This paper presents a new approach for the synthesis of spherical four-bar mechanisms with two or three prescribed coupler curve cusps. According to the configuration of a spherical four-bar mechanism whose coupler point coincides with the instant center at two separated positions, two kinds of degenerated curves for the corresponding spherical Burmester curves are obtained. For each degenerated curve, a synthesis procedure is proposed for the dimensional synthesis of spherical four-bar mechanisms to trace a coupler curve with two prescribed cusps. The possible types of spherical four-bar mechanisms with two-cusp coupler curves are discussed. Furthermore, special spherical double-rockers are also presented for tracing a symmetric coupler curve with two cusps, tracing a doubly symmetric coupler curve with two cusps or tracing a symmetric coupler curve with three cusps.

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Chung, W.-Y. "Position analysis of Assur kinematic chains using coupler curves." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 220, no. 8 (August 1, 2006): 1249–59. http://dx.doi.org/10.1243/09544062jmes249.

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The configurations of several Assur kinematic chains (AKCs) are analysed with the aid of coupler curves. An analysed linkage is dismantled into two constituent linkages. The intersection points of two coupler curves generated by the constituent linkages are the solutions of the dismantling point. All possible configurations of the linkage can then be obtained with the dismantling point being found by solving two coupler curve equations. The coupler curve equations of Watt-I and Stephenson-I six-bar are derived with orders and circularities being emphasized. All three AKCs with seven-link and several AKCs with nine-link and even with 11-link are analysed. The maximum number of solutions can also be determined easily on the basis of the orders and circularities of the coupler curves. The chains with prismatic joints included are also considered.

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Lu, D. M. "A Triangular Nomogram for Spherical Symmetric Coupler Curves and its Application to Mechanism Design." Journal of Mechanical Design 121, no. 2 (June 1, 1999): 323–26. http://dx.doi.org/10.1115/1.2829463.

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This paper presents a triangular nomogram for spherical symmetric coupler curves generated by a spherical crank-rocker with special dimensions. The paper also illustrates the application of this nomogram for spherical mechanism design. The expression of symmetric coupler curves traced by the spherical crank-rocker is derived. A computer program is developed to calculate the coordinates of the coupler curve points for the prescribed dimensions of the mechanism. According to the classified properties of coupler curves obtained, a triangular nomogram for spherical symmetric coupler curves can then be constructed by using three design parameters, i.e., length of crank, length of fixed link, and coupler angle. The triangular nomogram provides an alternative selection for dimensional synthesis of spherical path generators. The synthesized mechanisms can also be used to provide initial estimates for optimal synthesis of spherical path generators. A design example is presented.

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Blechschmidt, J. L., and J. J. Uicker. "Linkage Synthesis Using Algebraic Curves." Journal of Mechanisms, Transmissions, and Automation in Design 108, no. 4 (December 1, 1986): 543–48. http://dx.doi.org/10.1115/1.3258767.

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A method to snythesize four-bar linkages using the algebraic curve of the motion of the coupler point on the coupler link of the four-bar linkage is developed. This method is a departure from modern synthesis methods, most of which are based upon Burmester theory. This curve, which is a planar algebraic polynomial in two variables for the four-bar linkage, is a trinodal tricircular sextic (sixth order). These properties are used to determine the coefficients of the curve given a set of points that the coupler point of the coupler link is to pass through. The coefficients of this curve are nonlinear functions of the linkage parameters. The resulting set of nonlinear equations are solved using iterative/optimization techniques for the linkage parameters.

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Shirazi, Kourosh H. "Symmetrical Coupler Curve and Singular Point Classification in Planar and Spherical Swinging-Block Linkages." Journal of Mechanical Design 128, no. 2 (July 12, 2005): 436–43. http://dx.doi.org/10.1115/1.2167651.

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The purpose of the present paper is coupler curve synthesis and classification in planar and spherical swinging block linkages for path generation problem. It is shown that the swinging block mechanism, which is an inversion of the slider crank mechanism, can be classified into two types. The first type generates Lemniscate coupler curves consisting one or two loops. In this case, two double points, namely cusp and crunode, occur depending on the mechanism's dimension. The second type generates Cardioid and Limaçon type coupler-curves consisting of one, two, three, and four loops. In this case, three kinds of double points, namely cusp, crunode, and tacnode, occur. For the spherical swinging-block linkages, a parametric coupler curve equation is derived. Using a trigonometric similitude between the planar and spherical linkages, a symmetrical coupler curve and singular point classification is accomplished.

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Shieh, W. B., L. W. Tsai, S. Azarm, and A. L. Tits. "A New Class of Six-Bar Mechanisms With Symmetrical Coupler Curves." Journal of Mechanical Design 120, no. 1 (March 1, 1998): 150–53. http://dx.doi.org/10.1115/1.2826668.

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A new class of six-bar mechanisms with symmetrical coupler-point curves is presented. This class of mechanisms is made up of a four-bar linkage with an additional dyad to form an embedded skew pantograph. Because the coupler curve generated at an output point is amplified from that of a four-bar, a compact mechanism with a relatively large coupler curve can be obtained. In addition, due to their structure arrangement, the analysis and synthesis of such mechanisms can be easily achieved. Finally, an example mechanism from this class is illustrated and compared with a four-bar linkage with the same coupler curve.

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Gibson, C. G., and D. Marsh. "On the Geometry of Geared 5-Bar Motion." Journal of Mechanical Design 112, no. 4 (December 1, 1990): 620–27. http://dx.doi.org/10.1115/1.2912654.

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A new approach is adopted to study the geometry of the coupler curves associated to geared 5-bar motion. The key idea is to think of a configuration of the mechanism as a point in a higher - dimensional configuration space; the family of all configurations is then represented by an algebraic curve in that space. Coupler curves appear naturally as projections of this curve, so their properties can be deduced by projection, independent of any explicit knowledge of their equations.

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Corves, Burkhard, Guido Lonij, and Mathias Hüsing. "Kinematic Synthesis of a Step Mechanism Based on a Five Bar Linkage." Applied Mechanics and Materials 162 (March 2012): 1–10. http://dx.doi.org/10.4028/www.scientific.net/amm.162.1.

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On the basis of a five bar linkage it is possible to generate actinomorphic coupler curves if certain conditions, related to the kinematic dimensions and the gear ratio between the two cranks, are fulfilled. These symmetric coupler curves can then be used to realize a step mechanism by adding two additional links, taking advantage of the typical curvature characteristics of the generated coupler curve The following article starts with a short literature survey about five bar linkages in general and their use as dwell or step mechanisms in particular. Then it will be shown how the curvature properties of the coupler curves generated by five bar linkages can be determined by graphical means. It will be shown how this procedure can be advantageously applied with the help of an interactive geometry program, using the geometric determination of the curvature properties, such that an optimal step mechanism can be derived.

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Dhingra, A. K., A. N. Almadi, and D. Kohli. "A Closed-Form Approach to Coupler-Curves of Multi-Loop Mechanisms." Journal of Mechanical Design 122, no. 4 (August 1, 1999): 464–71. http://dx.doi.org/10.1115/1.1290394.

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This paper presents a closed-form approach, based on the theory of resultants, for deriving the coupler curve equation of 16 8-link mechanisms. The solution approach entails successive elimination of problem unknowns to reduce a multivariate system of 8 equations in 9 unknowns into a single bivariate equation. This bivariate equation is the coupler curve equation of the mechanism under consideration. Three theorems, which summarize key coupler curve characteristics, are outlined. The computational procedure is illustrated through two numerical examples. The first example addresses in detail some of the problems associated with the conversion of transcendental loop equations into an algebraic form using tangent half-angle substitutions. An extension of the proposed approach to the determination of degrees of input-output (I/O) polynomials and coupler curves for a general n-link mechanism is also presented. [S1050-0472(00)01104-1]

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Dissertations / Theses on the topic "Coupler curves"

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Natesan, Arun K. "Kinematic analysis and synthesis of four-bar mechanisms for straight line coupler curves /." Online version of thesis, 1994. http://hdl.handle.net/1850/11785.

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Rojas, Nicolàs. "Distance-based formulations for the position analysis of kinematic chains." Doctoral thesis, Universitat Politècnica de Catalunya, 2012. http://hdl.handle.net/10803/83516.

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This thesis addresses the kinematic analysis of mechanisms, in particular, the position analysis of kinematic chains, or linkages, that is, mechanisms with rigid bodies (links) interconnected by kinematic pairs (joints). This problem, of completely geometrical nature, consists in finding the feasible assembly modes that a kinematic chain can adopt. An assembly mode is a possible relative transformation between the links of a kinematic chain. When an assignment of positions and orientations is made for all links with respect to a given reference frame, an assembly mode is called a configuration. The methods reported in the literature for solving the position analysis of kinematic chains can be classified as graphical, analytical, or numerical. The graphical approaches are mostly geometrical and designed to solve particular problems. The analytical and numerical methods deal, in general, with kinematic chains of any topology and translate the original geometric problem into a system of kinematic analysis of all the Assur kinematic chains resulting from replacing some of its revolute joints by slider joints. Thus, it is concluded that the polynomials of all fully-parallel planar robots can be derived directly from that of the widely known 3-RPR robot. In addition to these results, this thesis also presents an efficient procedure, based on distance and oriented area constraints, and geometrical arguments, to trace coupler curves of pin-jointed Gr¨ubler kinematic chains. All these techniques and results together are contributions to theoretical kinematics of mechanisms, robot kinematics, and distance plane geometry. equations that defines the location of each link based, mainly, on independent loop equations. In the analytical approaches, the system of kinematic equations is reduced to a polynomial, known as the characteristic polynomial of the linkage, using different elimination methods —e.g., Gr¨obner bases or resultant techniques. In the numerical approaches, the system of kinematic equations is solved using, for instance, polynomial continuation or interval-based procedures. In any case, the use of independent loop equations to solve the position analysis of kinematic chains, almost a standard in kinematics of mechanisms, has seldom been questioned despite the resulting system of kinematic equations becomes quite involved even for simple linkages. Moreover, stating the position analysis of kinematic chains directly in terms of poses, with or without using independent loop equations, introduces two major disadvantages: arbitrary reference frames has to be included, and all formulas involve translations and rotations simultaneously. This thesis departs from this standard approach by, instead of directly computing Cartesian locations, expressing the original position problem as a system of distance-based constraints that are then solved using analytical and numerical procedures adapted to their particularities. In favor of developing the basics and theory of the proposed approach, this thesis focuses on the study of the most fundamental planar kinematic chains, namely, Baranov trusses, Assur kinematic chains, and pin-jointed Gr¨ubler kinematic chains. The results obtained have shown that the novel developed techniques are promising tools for the position analysis of kinematic chains and related problems. For example, using these techniques, the characteristic polynomials of most of the cataloged Baranov trusses can be obtained without relying on variable eliminations or trigonometric substitutions and using no other tools than elementary algebra. An outcome in clear contrast with the complex variable eliminations require when independent loop equations are used to tackle the problem. The impact of the above result is actually greater because it is shown that the characteristic polynomial of a Baranov truss, derived using the proposed distance-based techniques, contains all the necessary and sufficient information for solving the position
Esta tesis aborda el problema de análisis de posición de cadenas cinemáticas, mecanismos con cuerpos rígidos (enlaces) interconectados por pares cinemáticos (articulaciones). Este problema, de naturaleza geométrica, consiste en encontrar los modos de ensamblaje factibles que una cadena cinemática puede adoptar. Un modo de ensamblaje es una transformación relativa posible entre los enlaces de una cadena cinemática. Los métodos reportados en la literatura para la solución del análisis de posición de cadenas cinemáticas se pueden clasificar como gráficos, analíticos o numéricos. Los enfoques gráficos son geométricos y se diseñan para resolver problemas particulares. Los métodos analíticos y numéricos tratan con cadenas cinemáticas de cualquier topología y traducen el problema geométrico original en un sistema de ecuaciones cinemáticas que define la ubicación de cada enlace, basado generalmente en ecuaciones de bucle independientes. En los enfoques analíticos, el sistema de ecuaciones cinemáticas se reduce a un polinomio, conocido como el polinomio característico de la cadena cinemática, utilizando diferentes métodos de eliminación. En los métodos numéricos, el sistema se resuelve utilizando, por ejemplo, la continuación polinomial o procedimientos basados en intervalos. En cualquier caso, el uso de ecuaciones de bucle independientes, un estándar en cinemática de mecanismos, rara vez ha sido cuestionado a pesar de que el sistema resultante de ecuaciones es bastante complicado, incluso para cadenas simples. Por otra parte, establecer el análisis de la posición de cadenas cinemáticas directamente en términos de poses, con o sin el uso de ecuaciones de bucle independientes, presenta dos inconvenientes: sistemas de referencia arbitrarios deben ser introducidos, y todas las fórmulas implican traslaciones y rotaciones de forma simultánea. Esta tesis se aparta de este enfoque estándar expresando el problema de posición original como un sistema de restricciones basadas en distancias, en lugar de directamente calcular posiciones cartesianas. Estas restricciones son posteriormente resueltas con procedimientos analíticos y numéricos adaptados a sus particularidades. Con el propósito de desarrollar los conceptos básicos y la teoría del enfoque propuesto, esta tesis se centra en el estudio de las cadenas cinemáticas planas más fundamentales, a saber, estructuras de Baranov, cadenas cinemáticas de Assur, y cadenas cinemáticas de Grübler. Los resultados obtenidos han demostrado que las técnicas desarrolladas son herramientas prometedoras para el análisis de posición de cadenas cinemáticas y problemas relacionados. Por ejemplo, usando dichas técnicas, los polinomios característicos de la mayoría de las estructuras de Baranov catalogadas se puede obtener sin realizar eliminaciones de variables o sustituciones trigonométricas, y utilizando solo álgebra elemental. Un resultado en claro contraste con las complejas eliminaciones de variables que se requieren cuando se utilizan ecuaciones de bucle independientes. El impacto del resultado anterior es mayor porque se demuestra que el polinomio característico de una estructura de Baranov, derivado con las técnicas propuestas, contiene toda la información necesaria y suficiente para resolver el análisis de posición de las cadenas cinemáticas de Assur que resultan de la sustitución de algunas de sus articulaciones de revolución por articulaciones prismáticas. De esta forma, se concluye que los polinomios de todos los robots planares totalmente paralelos se pueden derivar directamente del polinomio característico del conocido robot 3-RPR. Adicionalmente, se presenta un procedimiento eficaz, basado en restricciones de distancias y áreas orientadas, y argumentos geométricos, para trazar curvas de acoplador de cadenas cinemáticas de Grübler. En conjunto, todas estas técnicas y resultados constituyen contribuciones a la cinemática teórica de mecanismos, la cinemática de robots, y la geometría plana de distancias. Barcelona 13-

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Adams, Daniel J. "Magnetization Dynamics in Coupled Thin Film Systems." ScholarWorks@UNO, 2019. https://scholarworks.uno.edu/td/2578.

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A study is presented detailing experimental investigations of magnetization dynamics in nanostructured systems which are coupled magnetically. This work seeks to characterize the anisotropy of such systems through experimental techniques which probe microwave resonant absorption in the materials. A custom-built experimental setup, designed and assembled in our labs, is explained in detail. This setup allows for angular-dependent ferromagnetic resonance (FMR) measurements in the sample plane through vector network analyzer spectroscopy and is adaptable to two different types of coplanar waveguides. This technique has proven effective for characterization of multiple types of magnetic systems, including multilayered structures as detailed here, with different types of anisotropies while allowing us to draw analogies with more common characterization techniques. The angular FMR setup has been used to study coupled systems, such as those coupled through the Ruderman–Kittel–Kasuya–Yosida interaction as well as exchange-biased structures. These types of coupled systems have technological impacts and are highly applied in the components of magnetoresistive random access memory. Using this new characterization technique, properties of synthetic antiferromagnets have been revealed which had not been observed before. In addition to these experiments, magnetic susceptibility and FMR in exchange biased systems have been investigated at temperatures as low as 2 K. This investigation used a new FMR spectrometer and was one of the first studies to use this instrument. For the first time a new method of identifying several types of coupling which can be present in layered nanostructures is presented and supported through comparison with known techniques, thus connecting a new characterization technique for layered structures with decades-old procedures. Many results within this work are also supported theoretically with computer simulations.

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Radu, Cosmin. "Study of Magnetization Switching in Coupled Magnetic Nanostructured Systems." ScholarWorks@UNO, 2008. http://scholarworks.uno.edu/td/894.

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A study of magnetization dynamics experiments in nanostructured materials using the rf susceptibility tunnel diode oscillator (TDO) method is presented along with a extensive theoretical analysis. An original, computer controlled experimental setup that measures the change in susceptibility with the variation in external magnetic field and sample temperature was constructed. The TDO-based experiment design and construction is explained in detail, showing all the elements of originality. This experimental technique has proven reliable for characterizing samples with uncoupled magnetic structure and various magnetic anisotropies like: CrO2 , FeCo/IrMn and Co/SiO2 thin films. The TDO was subsequently used to explore the magnetization switching in coupled magnetic systems, like synthetic antiferromagnet (SAF) structures. Magnetoresistive random access memory (MRAM) is an important example of devices where the use of SAF structure is essential. To support the understanding of the SAF magnetic behavior, its configuration and application are reviewed and more details are provided in an appendix. Current problems in increasing the scalability and decreasing the error rate of MRAM devices are closely connected to the switching properties of the SAF structures. Several theoretical studies that were devoted to the understanding of the concepts of SAF critical curve are reviewed. As one can notice, there was no experimental determination of SAF critical curve, due to the difficulties in characterizing a magnetic coupled structure. Depending of the coupling strength between the two ferromagnetic layers, on the SAF critical curve one distinguishes several new features, inexistent in the case of uncoupled systems. Knowing the configuration of the SAF critical curve is of great importance in order to control its switching characteristics. For the first time a method of experimentally recording the critical curve for SAF is proposed in this work. In order to overcome technological limitations, a new way of recording the critical curve by using an additional magnetic bias field was explored.

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Sousa, Mayco Velasco de. "Consideração da superfície livre do fluido interno nas curvas de ressonância das cascas cilíndricas." Universidade Federal de Goiás, 2017. http://repositorio.bc.ufg.br/tede/handle/tede/7864.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
In this master’s thesis, the free and forced nonlinear vibrations of an simply supported isotropic cylindrical shell fluid-filled by an incompressible, inrotational and non-viscous fluid are analyzed. The internal fluid is described by a velocity potential and the effects of the fluid ́s free surface on the non-linear vibrations of the cylindrical shell are considered. The non-linear equations of motion are obtained by the Rayleigh-Ritz method, considering the deformation field and changes of curvature described by the nonlinear theories of Donnell and Sanders. The chosen displacement field of the cylindrical shell corresponds to a modal solution proposed by Gonçalves (1987) that were obtained by the perturbation method. A parametric study is carried out to analyze the free vibrations, using the Galerkin-Urabe method to obtain for each geometry a system of non-linear algebraic equations, being solved by the Newton-Raphson method and thus to obtaining a relation between the amplitude and frequency. The results for these analyses show that depending on the geometric conditions there is a great influence of the free surface consideration on the nonlinear dynamic behavior of the cylindrical shell. Finally, a study of the forced vibrations of cylindrical shells subjected to time-dependent lateral pressure is made applying the fourth-order Runge-Kutta method to solve the second-order differential equations in time in order to find the phase portraits and the time response of the cylindrical shell. The influence of the consideration of the free surface effect of the internal fluid on the forced response of the cylindrical shell is observed and it is possible to note that the consideration of the free surface causes the appearance of important peaks of resonance in the resonance curves of the cylindrical shell.
Nesta dissertação são analisadas as vibrações não lineares, livres e forçada, de uma casca cilíndrica isotrópica simplesmente apoiada e preenchida por um fluido irrotacional, incompressível e não viscoso, que pode ser descrito por um potencial de velocidade. Considera-se os efeitos da superfície livre deste fluido nas vibrações não lineares da casca cilíndrica. As equações de movimento não lineares foram obtidas pelo método de Rayleigh-Ritz e para descrever o campo de deformação e momento de curvatura foram adotadas as teorias não lineares de Donnell e Sanders. O campo de deslocamento da casca cilíndrica utilizado corresponde a uma solução modal propostapor Gonçalves (1987) que foram obtidas pelo método da perturbação. Realizou-se um estudo paramétrico para analisar as vibrações livres onde para cada geometria estudada foi aplicado o método de Galerkin-Urabe para obter um sistema de equações algébricas não lineares, sendo então resolvidas pelo método de Newton-Raphson e assim obtendo uma relação entre a amplitude e a frequência. Os resultados para estes estudos mostram que dependendo das condições geométricas há uma grande influência da consideração da superfície livre no comportamento dinâmico não linear da casca cilíndrica. Por fim, é feito um estudo das vibrações forçadas de cascas cilíndricas submetidas a uma pressão lateral dependente do tempo, onde por meio do método de Runge-Kutta de quarta ordem soluciona-se as equações ordinais diferenciais de segunda ordem no tempo afim de encontrar as curvas de ressonância, planos-fase e a resposta no tempo da casca cilíndrica que serão utilizadas para analisar a influência da consideração do efeito de superfície livre do fluido interno na resposta forçada da casca cilíndrica. Observa-se que a consideração da superfície livre provoca o aparecimento de importantes picos de ressonância nas curvas de ressonância da casca cilíndrica.

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Nelkov, Nyagolov Dimitar, Bashir Abbas, and Genovski Filip Valentinov. "Simulation of the Geometry Influence on Curvic Coupled Engagement." Thesis, Linnéuniversitetet, Institutionen för teknik, TEK, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-27291.

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The thesis is performed in order to improve the curvic coupled engagement of a dog clutch situated in the transfer case of a truck. The dog clutch is used to engage the so called all-wheel-drive system of the truck. If the driver tries to engage the all-wheel-drive when truck’s rear wheels already skid, due to a slippery surface a relative rotational speed in the dog clutch will occur. This relative rotational speed will cause the dog clutch to bounce back of itself before engagement, or to not engage at all. The dog clutch has been redesigned to prevent this. Dynamic simulations using MD Adams have been made for the existing model, for the models created in previous works, and for the new model in order to figure out which of them will show the most stable engagement, at high relative rotational speed. The implemented simulations show that better results can be obtained. Separation into two parts of the disc pushed by the fork, shows that dog clutch’s engagement is faster and more stable, comparing to the original model and the other created models. The new model shows better coupling in the whole range of the relative rotational speed from 50 up to 120rpm.

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Barham, Connor C. "Childhood Trauma and Attachment Theory: Estimating a Growth Curve Relationship Between Adverse Childhood Experiences and the Therapeutic Alliance." BYU ScholarsArchive, 2020. https://scholarsarchive.byu.edu/etd/8595.

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The therapeutic alliance is a core element of successful treatment in therapy. Recent literature has explored variables that predict the alliance at various time points during therapy, but few studies have explored how the alliance develops over time and the factors that influence its rate of change. The current study addresses these questions by estimating latent growth-curve models to analyze how male and female partners' alliance scores develop over time and how adverse childhood experiences (ACEs) impact the development of the alliance during the first six sessions of therapy. Results from these analyses show that neither men nor women's ACEs had a significant effect on the rate of change in the alliance. A discussion of the attachment implications of these findings, as well as the limitations of this study and potential directions for future research are then presented.

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Khan, Mohammad Asif. "Study of Magnetization Switching in Coupled Magnetic Nanostructured Systems using a Tunnel Diode Oscillator." ScholarWorks@UNO, 2018. https://scholarworks.uno.edu/honors_theses/107.

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Static techniques to measure different magnetic properties of coupled magnetic nanostructured systems is researched and documented with an extensive analysis of the tunnel diode oscillator (TDO). The VSM was used to obtain the major hysteresis loop for the samples and the TDO was used to measure the magnetic susceptibility. The magnetic susceptibility was employed to conceive the static critical curve. The thesis describes both equipments, VSM and TDO, that were used to obtain data for our experiments. Albeit a more comprehensive outlook on the TDO is provided. The theoretical functionality of TDO, previous successful applications for experiments, and the physical setup in the laboratory is explored. The novel addition of the double Helmholtz coil in this setup is described. The viability of replacement of the big electromagnet and the advantages of the Helmholtz coil are discussed. Magnetization dynamics in a series of FeCoB/Ru/FeCoB synthetic antiferromagnetic samples were investigated via reversible susceptibility measurements acquired through the TDO. The major hysteresis loop generated by the VSM were used to calculate the coercivity and magnetic saturation of the sample. The VSM and TDO were subsequently used to explore the magnetization switching in a di_erent coupled magnetic system, the exchange bias samples. A range of NiFe/FeMn samples were studied with varying thickness of the antiferromagnetic layer.

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Tong, Fuguo. "Numerical modeling of coupled thermo-hydro-mechanical processes in geological porous media." Doctoral thesis, KTH, Teknisk geologi och geofysik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12009.

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Coupled Thermo-Hydro-Mechanical (THM) behavior in geological porous media has been a subject of great interest in many geoengineering disciplines. Many attempts have been made to develop numerical prediction capabilities associated with topics such as the movement of pollutant plumes, gas injection, energy storage, geothermal energy extraction, and safety assessment of repositories for radioactive waste and spent nuclear fuel. This thesis presents a new numerical modeling approach and a new computer code for simulating coupled THM behavior in geological porous media in general, and compacted bentonite clays in particular, as buffer materials in underground radioactive waste repositories. New governing equations were derived according to the theory of mixtures, considering interactions among solid-phase deformation, flows of water and gases, heat transport, and phase change of water. For three-dimensional problems, eight governing equations were formulated to describe the coupled THM processes. A new thermal conductivity model was developed to predict the thermal conductivity of geological porous media as composite mixtures. The proposed model considers the combined effects of solid mineral composition, temperature, liquid saturation degree, porosity and pressure on the effective thermal conductivity of the porous media. The predicted results agree well with the experimental data for MX80 bentonite. A new water retention curve model was developed to predict the suction-saturation behavior of the geological porous media, as a function of suction, effective saturated degree, temperature, porosity, pore-gas pressure, and the rate of saturation degree change with time. The model was verified against experimental data of the FEBEX bentonite, with good agreement between measured and calculated results. A new finite element code (ROLG) was developed for modeling fully coupled thermo-hydro-mechanical processes in geological porous media. The new code was validated against several analytical solutions and experiments, and was applied to simulate the large scale in-situ Canister Retrieval Test (CRT) at Äspö Hard Rock Laboratory, SKB, Sweden, with good agreement between measured and predicted results. The results are useful for performance and safety assessments of radioactive waste repositories.
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Ding, Yao. "Evaluation of New Seismic Performance Factors for Special Hybrid Coupled Core Wall Systems with Steel Coupling Beams." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1573225104906633.

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Books on the topic "Coupler curves"

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Malakh-Pines, Ayala. Couple burnout: Causes and cures. New York: Routledge, 1996.

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Malakh-Pines, Ayala. Couple Burnout: Causes and Cures. Routledge, 1996.

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Malakh-Pines, Ayala. Couple Burnout: Causes and Cures. Routledge, 1996.

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McCulloch, Renée, and John Collins. Paediatric pain control. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199656097.003.0913.

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Our understanding regarding pain in children has grown significantly in the past few decades; however, we still find reluctance to acknowledge and treat pain in children. Many myths prevail, and coupled with poor understanding, can undermine the effective treatment of pain in children. Understandably many health-care professionals are apprehensive and fearful about working with very sick and dying children; perhaps there is a sense of failure for being unable to ‘cure’. However, as pain is one of the most common symptoms in this group of children, relieving pain and distress can be an extremely rewarding experience. This chapter outlines the background and principles of understanding, evaluating, and treating pain in children with palliative care needs. It offers an overview of current evidence and hopes to support health-care professionals working in this challenging discipline.

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Rosen, David H., and Uyen B. Hoang. The Nature of the Healing Process. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780190628871.003.0007.

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This chapter examines the nature of the healing process. Healing is an intrinsic activity in all natural systems that comprise known tangibles of scientific healthcare in the broadest sense coupled with intangibles such as compassion, empathy, hope, and meaning. Three patients trying to heal are discussed. Opportunities for a healing partnership were missed because of the doctors’ narrow view of a biomedical perspective. Medical students who uphold broad-minded, humanistic attitudes are the first to detect something awry, and as reflected in this chapter, are so often at the vanguard expressing their ideals. Intangibles that make up such humanistic attitudes are embedded in the essence of medicine, although they may not fit neatly in the systems hierarchy and should not be rejected because there is so much yet to be understood. Healing can occur even where there is no cure.

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Ahlskog, J. Eric. Dementia with Lewy Body and Parkinson's Disease Patients. Oxford University Press, 2013. http://dx.doi.org/10.1093/oso/9780199977567.001.0001.

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Patients, spouses, families, and caregivers dealing with dementia face a host of complex issues, particularly when they must confront Dementia with Lewy Bodies or Parkinson's Disease. Until now there has been no guidebook for the general public to help navigate these challenging disorders. In Dementia with Lewy Bodies and Parkinson's Disease Dementia, Dr. J. Eric Ahlskog draws on 30 years of clinical and research work at Mayo Clinic to arm patients and families with crucial information that will enable them to work in tandem with their doctors. A diagnosis of dementia can be devastating, leaving families and caregivers struggling with a loved one's radically-impaired thinking and memory. When dementia is coupled with Parkinson's, which will develop in Parkinson's patients that live long enough, or with Lewy Bodies, which is the second leading cause of dementia behind Alzheimer's, the difficulties become even more daunting. And while these disorders are all too common, most people have little solid information about them. Too often doctors cannot spend the necessary time answering questions or discussing the specific challenges and treatments for these kinds of dementia during office visits. Arriving for a doctor appointment knowing the issues and treatment options beforehand gives patients and families an important head start. Dr. Ahlskog clearly explains all aspects of these disorders, their causes, symptoms, most effective drug treatments, proper doses, and which medications to avoid. He also discusses the complications that can arise in treating these conditions, given the variety of available medications and their possible side effects and interactions. While a cure does not yet exist, in this accessible, highly informative guidebook, Dr. Ahlskog shows that optimal medical treatment can markedly improve the quality of life for both patients and family.

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Book chapters on the topic "Coupler curves"

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Yadav, Harishankar Singh, and Shubhashis Sanyal. "Generation of Coupler Curves for Planar Kinematic Chains Using Link Joint Equations." In Lecture Notes in Mechanical Engineering, 491–501. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0550-5_49.

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Thomas, Federico, and Alba Pérez-Gracia. "A New Insight into the Coupler Curves of the RCCC Four-Bar Linkage." In Computational Kinematics, 552–59. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-60867-9_63.

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Innocenti, Carlo. "Analytical Determination of the Intersections of Two Coupler-Point Curves Generated by Two Four-Bar Linkages." In Solid Mechanics and Its Applications, 251–62. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-015-8192-9_23.

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Rössl, Christian, and Holger Theisel. "Couple Points – A Local Approach to Global Surface Analysis." In Curves and Surfaces, 586–602. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27413-8_39.

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Schwemmer, Michael A., and Timothy J. Lewis. "The Theory of Weakly Coupled Oscillators." In Phase Response Curves in Neuroscience, 3–31. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4614-0739-3_1.

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Lewis, Timothy J., and Frances K. Skinner. "Understanding Activity in Electrically Coupled Networks Using PRCs and the Theory of Weakly Coupled Oscillators." In Phase Response Curves in Neuroscience, 329–59. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4614-0739-3_14.

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Jancovici, Bernard. "Two-Dimensional Logarithmic Interaction on Curved Surfaces." In Strongly Coupled Coulomb Systems, 709–12. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/0-306-47086-1_134.

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Cohen, Jeremy Emile, Rodrigo Cabral Farias, and Bertrand Rivet. "Curve Registered Coupled Low Rank Factorization." In Latent Variable Analysis and Signal Separation, 36–45. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-93764-9_4.

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Canavier, Carmen C., and Srisairam Achuthan. "History of the Application of the Phase Resetting Curve to Neurons Coupled in a Pulsatile Manner." In Phase Response Curves in Neuroscience, 73–91. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4614-0739-3_4.

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Bai, Shaoping. "Determination of Linkage Parameters from Coupler Curve Equations." In Mechanisms, Transmissions and Applications, 49–57. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-17067-1_6.

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Conference papers on the topic "Coupler curves"

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Rojas, Nicola´s, and Federico Thomas. "A Coordinate-Free Approach to Tracing the Coupler Curves of Pin-Jointed Linkages." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-48147.

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In general, high-order coupler curves of plane mechanisms cannot be properly traced by standard predictor-corrector algorithms due to drifting problems and the presence of singularities. Instead of focusing on finding better algorithms for tracing curves, a simple coordinate-free method that first traces these curves in a distance space and then maps them onto the mechanism workspace is proposed. Tracing a coupler curve in the proposed distance space is much simpler because (a) the equation of this curve in this space can be straightforwardly obtained from a sequence of bilaterations; and (b) the curve in this space naturally decomposes into branches in which the signs of the oriented areas of the triangles involved in the aforementioned bilaterations remain constant. A surjective mapping permits to map the thus traced curves onto the workspace of the mechanism. The advantages of this two-step method are exemplified by tracing the coupler curves of a double butterfly linkage, curves that can reach order 48.

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Dhingra, A. K., A. N. Almadi, and D. Kohli. "A Closed-Form Approach to Coupler-Curves of Multi-Loop Mechanisms." In ASME 1998 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/detc98/mech-5925.

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Abstract This paper presents a closed-form approach, based on the theory of resultants, for deriving the coupler curve equation of 16 8-link mechanisms. The solution approach entails successive elimination of problem unknowns to reduce a multivariate system of 8 equations into a single bivariate equation. This bivariate equation is the coupler curve of the mechanism under consideration. Three theorems which summarize key coupler curve characteristics are presented. The computational procedure is illustrated through two numerical examples. These examples address in detail some of the problems associated with the conversion of transcendental loop equations into an algebraic form using tangent half-angle substitutions. An extension of the proposed approach to the determination of degrees of input-output (I/O) polynomials and coupler curves for general n-link mechanisms is also presented.

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Shieh, W. B., L. W. Tsai, S. Azarm, and A. L. Tits. "A New Class of Six-Bar Mechanisms With Symmetrical Coupler Curves." In ASME 1996 Design Engineering Technical Conferences and Computers in Engineering Conference. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-detc/dac-1491.

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Abstract A new class of six-bar mechanisms with symmetrical coupler-point curves is presented. This class of mechanisms is made up of a four-bar linkage with an additional dyad to form an embedded regular or skew pantograph. Because the coupler curve generated at an output point is amplified from that of a four-bar, a compact mechanism with a relatively large coupler curve can be obtained. In addition, due to their structure arrangement, the analysis and synthesis of such mechanisms can be easily achieved. It is shown that the admissible range of transmission angle for such mechanisms is smaller than that of a four-bar mechanism. It is also shown that mechanisms with an embedded skew pantograph exhibit better design flexibility than those with an embedded regular pantograph. Finally, an example mechanism from this class is illustrated and compared with a four-bar linkage with the same coupler curve.

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Yan, Hong-Sen, and Wen-Hsiang Hsieh. "On the Coupler Curve of RCPCR Linkages." In ASME 1998 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/detc98/mech-5900.

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Abstract The purpose of this paper is to investigate the properties of the coupler curves generated by all RCPCR linkages. First, the 3 × 3 matrix with dual elements is used to establish the loop closure equation, the displacement equations are derived, and all joints variables are expressed in terms of input and output variables. Then, the parametric equations of the coupler curve are found by the D-H matrix. Finally, homogeneous coordinate is introduced to those displacement equations, and the order and some critical properties of the coupler curve are investigated based on the theories of algebraic curve and analytical geometry of three dimensions. In addition, RCPCR and RRCPC linkages are used as examples for illustrations. Moreover, the results on the application of dimensional synthesis are discussed.

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Hoeltzel, D. A., and W. H. Chieng. "Pattern Matching Synthesis As an Automated Approach to Mechanism Design." In ASME 1989 Design Technical Conferences. American Society of Mechanical Engineers, 1989. http://dx.doi.org/10.1115/detc1989-0043.

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Abstract A new knowledge-based approach for the synthesis of mechanisms, referred to as Pattern Matching Synthesis, has been developed based on committee machine and Hopfield neural network models of pattern matching applied to coupler curves. Computational tests performed on a dimensionally parameterized four bar mechanism have yielded 15 distinct coupler curve groups (patterns) from a total of 356 generated coupler curves. This innovative approach represents a first step toward the automation of mapping structure-to-function in mechanism design based on the application of artificial intelligence programming techniques.

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Kota, S., and R. B. Gudapati. "Automatic Selection of Four-Bar Linkage Designs for Path Generation Task." In ASME 1988 Design Technology Conferences. American Society of Mechanical Engineers, 1988. http://dx.doi.org/10.1115/detc1988-0051.

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Abstract Often a simple mechanism to trace a desired path is sought. Coupler curves of linkages are generally difficult to determine, especially in the case that a certain shape or a type of curve is required for a particular application. Precision point techniques do not guarantee that the desired path will be generated. The design methodology presented in this paper is an indirect synthesis approach to design four-bar linkages that trace (approximately) a given desired path. Simple and yet extremely useful design charts for the initial selection of four-bar linkage candidate designs are presented in this paper. This is based on our philosophy that an arbitrary path (desired) can be viewed as an approximation to a known symmetrical path. Four-bar linkages that generate symmetrical paths are easier to design and exhibit a definite pattern of changes in their shape as the linkage parameters are varied. The first step in automating the design-selection process requires a satisfactory means to quantitatively compare the desired with the known (symmetrical) coupler curves. This paper addresses various issues involved in the comparison of two arbitrary curves. Based on curve parametrization, an effective algorithm for quantitative shape evaluation of arbitrary curves is developed. Finally, the design charts and design examples are presented.

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Durali, Mohammad, and Mohammad Mehdi Jalili Bahabadi. "Investigation of Train Dynamics in Passing Through Curves Using a Full Model." In ASME/IEEE 2004 Joint Rail Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/rtd2004-66044.

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In this article a train model is developed for studying train derailment in passing through bends. The model is three dimensional, nonlinear, and considers 43 degrees of freedom for each wagon. All nonlinear characteristics of suspension elements as well as flexibilities of wagon body and bogie frame, and the effect of coupler forces are included in the model. The equations of motion for the train are solved numerically for different train conditions. A neural network was constructed as an element in solution loop for determination of wheel-rail contact geometry. Derailment factor was calculated for each case. The results are presented and show the major role of coupler forces on possible train derailment.

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Nisbett, J. Keith, and Sanjay K. Gupta. "A Dynamic Implementation of Keller’s Sketching Rules for Burmester Curves an Approach to Sensitivity Analysis." In ASME 1992 Design Technical Conferences. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/detc1992-0329.

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Abstract Keller’s sketching rules for Burmester curves are implemented on the computer for automatic generation of valid and invalid regions for the existence of the curves. The rules are based on the poles of the coupler motion, which in turn are directly related to the precision positions. All six possible unique arrangements of poles are used in the sketching rules. The sketching rules provide a useful heuristic and geometric approach to relating the sensitivity of the curves to small changes in the pole locations. The regions and the curves are dynamically updated as the poles of the specified motion are moved by the user. The new curve obtained is checked to verify satisfaction of original tolerance specification on the precision positions. The procedure shows promise for artificially intelligent approaches to linkage design.

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Chavan, Umesh, Mukund Nalawade, and Satishchandra Joshi. "Notice of Retraction: Synthesis of coupler curves with combined planar cam follower mechanisms by genetic algorithm." In 2010 2nd International Conference on Computer Engineering and Technology (ICCET). IEEE, 2010. http://dx.doi.org/10.1109/iccet.2010.5486260.

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Ullah, Irfan, and Sridhar Kota. "Globally-Optimal Synthesis of Mechanisms for Path Generation Using Simulated Annealing and Powell’s Method." In ASME 1996 Design Engineering Technical Conferences and Computers in Engineering Conference. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-detc/mech-1225.

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Abstract Success in synthesis of mechanisms for path generation usually depends on providing a good starting point to the optimizer. This paper presents a completely automatic method that performs a global search from a random starting point. A two-step synthesis process involves searching for a coupler curve of optimal shape followed by optimization of size, orientation, and position of the solution mechanism. For the first step, an objective function evaluating shape difference between two curves, irrespective of the differences in their sizes, orientation, and position, is defined based on Fourier descriptors of the curves. This function is minimized using a stochastic global search method derived from simulated annealing, followed by Powell’s method for fast convergence. In the second stage, using properties of Fourier descriptors, a set of points is located on the solution curve that is analogous to points specified on the desired curve. The size, orientation, and position of the solution mechanism is then determined by minimizing the distance between analogous points.

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Reports on the topic "Coupler curves"

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Harris, John G. Coupled Elastic Surface Wave in Curved Structures. Fort Belvoir, VA: Defense Technical Information Center, February 2000. http://dx.doi.org/10.21236/ada374339.

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Prabhakar, S. New Diagnostics and Cures for Coupled-Bunch Instabilities. Office of Scientific and Technical Information (OSTI), June 2018. http://dx.doi.org/10.2172/1454227.

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Prabhakar, S. New Diagnostics and Cures for Coupled-Bunch Instabilities. Office of Scientific and Technical Information (OSTI), June 2018. http://dx.doi.org/10.2172/1454228.

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Teytelman, Dmitry. NEW DIAGNOSTICS AND CURES FOR COUPLED-BUNCH INSTABILITIES. Office of Scientific and Technical Information (OSTI), August 2002. http://dx.doi.org/10.2172/799991.

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Prabhakar, S. New diagnostics and cures for coupled-bunch instabilities. Office of Scientific and Technical Information (OSTI), February 2000. http://dx.doi.org/10.2172/753308.

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Fox, John D. Cure of Coupled Bunch Instabilities in PLS Storage Ring. Office of Scientific and Technical Information (OSTI), April 2003. http://dx.doi.org/10.2172/813011.

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Chao, Alex W. Study of Uneven Fills to Cure the Coupled-Bunch Instability in SRRC. Office of Scientific and Technical Information (OSTI), August 2002. http://dx.doi.org/10.2172/800017.

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Yan, Yujie, and Jerome F. Hajjar. Automated Damage Assessment and Structural Modeling of Bridges with Visual Sensing Technology. Northeastern University, May 2021. http://dx.doi.org/10.17760/d20410114.

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Recent advances in visual sensing technology have gained much attention in the field of bridge inspection and management. Coupled with advanced robotic systems, state-of-the-art visual sensors can be used to obtain accurate documentation of bridges without the need for any special equipment or traffic closure. The captured visual sensor data can be post-processed to gather meaningful information for the bridge structures and hence to support bridge inspection and management. However, state-of-the-practice data postprocessing approaches require substantial manual operations, which can be time-consuming and expensive. The main objective of this study is to develop methods and algorithms to automate the post-processing of the visual sensor data towards the extraction of three main categories of information: 1) object information such as object identity, shapes, and spatial relationships - a novel heuristic-based method is proposed to automate the detection and recognition of main structural elements of steel girder bridges in both terrestrial and unmanned aerial vehicle (UAV)-based laser scanning data. Domain knowledge on the geometric and topological constraints of the structural elements is modeled and utilized as heuristics to guide the search as well as to reject erroneous detection results. 2) structural damage information, such as damage locations and quantities - to support the assessment of damage associated with small deformations, an advanced crack assessment method is proposed to enable automated detection and quantification of concrete cracks in critical structural elements based on UAV-based visual sensor data. In terms of damage associated with large deformations, based on the surface normal-based method proposed in Guldur et al. (2014), a new algorithm is developed to enhance the robustness of damage assessment for structural elements with curved surfaces. 3) three-dimensional volumetric models - the object information extracted from the laser scanning data is exploited to create a complete geometric representation for each structural element. In addition, mesh generation algorithms are developed to automatically convert the geometric representations into conformal all-hexahedron finite element meshes, which can be finally assembled to create a finite element model of the entire bridge. To validate the effectiveness of the developed methods and algorithms, several field data collections have been conducted to collect both the visual sensor data and the physical measurements from experimental specimens and in-service bridges. The data were collected using both terrestrial laser scanners combined with images, and laser scanners and cameras mounted to unmanned aerial vehicles.

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