Relevant bibliographies by topics / Flat spiral coil

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  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'Flat spiral coil'

Author: Grafiati
Published: 4 June 2021
Last updated: 4 February 2022

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Journal articles on the topic "Flat spiral coil"

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Luca, Dorin, Cristina Biriş, and Dorian Luca. "Electromagnetic Forming Analysis of the Al 99.0 Sheet with Tools of Different Configurations." MATEC Web of Conferences 290 (2019): 03010. http://dx.doi.org/10.1051/matecconf/201929003010.

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Electromagnetic forming is an advanced manufacturing procedure, characterized by the fact that the tool carrying the deformation force does not touch the workpiece. This paper presents research regarding the electromagnetic forming of Al 99.0 (EN AW-1200) sheet with coils, having different configurations. The purpose of the research was to find the flat spiral coil configuration that ensures maximum deformation of the workpiece. Flat spiral coils with different gaps between the coil and the workpiece, and coils with different number of windings were tested. The influence of these parameters was monitored on the maximum strain of the free bulged parts. The analysis of the results obtained for different configurations of the flat spiral coils allowed the selection of the significant parameters that influenced the electromagnetic forming process of the Al 99.0 flat workpiece, which aimed to elaborate the mathematical model and to optimize the investigated process.
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Cui, Xiaohui, Dongyang Qiu, Lina Jiang, Hailiang Yu, Zhihao Du, and Ang Xiao. "Electromagnetic Sheet Forming by Uniform Pressure Using Flat Spiral Coil." Materials 12, no. 12 (June 18, 2019): 1963. http://dx.doi.org/10.3390/ma12121963.

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The coil is the most important component in electromagnetic forming. Two important questions in electromagnetic forming are how to obtain the desired magnetic force distribution on the sheet and increase the service life of the coil. A uniform pressure coil is widely used in sheet embossing, bulging, and welding. However, the coil is easy to break, and the manufacturing process is complex. In this paper, a new uniform-pressure coil with a planar structure was designed. A three-dimensional (3D) finite element model was established to analyze the effect of the main process parameters on magnetic force distribution. By comparing the experimental results, it was found that the simulation results have a higher analysis precision. Based on the simulation results, the resistivity of the die, spacing between the left and right parts of the coil, relative position between coil and sheet, and sheet width significantly affect the distribution of magnetic force. Compared with the structure and magnetic force on a traditional uniform pressure coil, the planar uniform pressure coil can produce a uniform magnetic force distribution on the sheet, reduce the manufacturing difficulty, reduce manufacturing cost, and enhance the service life for the coil.
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Liu, Xu, Chenyang Xia, and Xibo Yuan. "Study of the Circular Flat Spiral Coil Structure Effect on Wireless Power Transfer System Performance." Energies 11, no. 11 (October 23, 2018): 2875. http://dx.doi.org/10.3390/en11112875.

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This paper analyses the relationship between the coil design parameters and the system performance, including power transfer efficiency and amount, when circular flat spiral coils are adopted in a wireless power transfer (WPT) system. Coil design variables including outer radius, inner radius, channel width and coil turns are thoroughly studied to improve the system performance with a limited maximum outer radius for practical purposes. A two-coil WPT system has been built to verify the analysis, and the experimental results show good consistency with the theoretical calculations and simulation results, which show that the coil design parameters have a significant impact on the system performance, even with the same coil size. In the experiments, the coil-to-coil distance is 150 mm, the maximum coil outer radius is limited in 300 mm, and the DC input voltage and the load resistance are 100 V and 5 Ω, respectively. When the coils are tightly-wound in the most traditional way to maximize the coil size, the coil-system efficiency is 62.6% with only 4.5 W load power. In contrast, the efficiency optimized coil can improve the coil-system efficiency to 91.2% with the outer radius stayed the same. Besides, when the power transfer efficiency and amount are considered simultaneously, the system can achieve 1279 W load power with 85.94% coil-system efficiency.
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Luo, Win-Jet, C. Bambang Dwi Kuncoro, Pratikto, and Yean-Der Kuan. "Single-Layer Transmitter Array Coil Pattern Evaluation toward a Uniform Vertical Magnetic Field Distribution." Energies 12, no. 21 (October 31, 2019): 4157. http://dx.doi.org/10.3390/en12214157.

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A uniform magnetic field distribution is a critical aspect in the transmitter array coil design process for achieving a homogenous vertical magnetic field distribution. The free position and orientation features can thus be implemented in the wireless power charging system. This paper presents vertical magnetic field distribution generated by a single-layer circular flat spiral air core transmitter array coil model analysis and evaluation using a numerical analysis method. This method is developed based on the off-symmetry axis magnetic field distribution due to a circular current loop derived from the Biot-Savart law. The proposed evaluation criteria are used to obtain the vertical magnetic field distribution characteristic of the evaluated array coil model. The vertical magnetic field distribution of several circular flat spiral air core coils, in both single and array coil models with different coil geometries were investigated to obtain the relation between the coil parameters and the distance between the adjoining coil centers to generate uniform vertical magnetic field distribution. A case study was also conducted to analyze and evaluate several array coil model patterns (1 × 2 array coil, 1 × 3 array coil, 2 × 2 array coil, 2 × 3 array coil) to meet uniform vertical magnetic field distribution. The array coil model is composed of an identical single circular flat spiral air-core coil. Every single coil has inner coil diameter (Di), outer coil diameter (Do), wire diameter (W), pitch (P) and a number of turns (N) at 25 mm, 47.8 mm, 0.643 mm, 0.03 mm, 17 respectively. The study and evaluation of several array coil pattern models show that the distance between the adjoining coil centers should be defined close to the half of coil outer diameter (1/2Do) to generate close to uniform vertical magnetic field distribution. The vertical magnetic field distribution average and magnetic field effective transmitting areas array coil model with the given coil parameters changing as the effect in variation in distances between the adjoining coil centers.
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Stevens, J. E., M. J. Sowa, and J. L. Cecchi. "Helicon plasma source excited by a flat spiral coil." Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 13, no. 5 (September 1995): 2476–82. http://dx.doi.org/10.1116/1.579491.

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Akbar, S., M. A. Aleem, M. N. Sarwar, A. U. Zillohu, M. S. Awan, A. Haider, Z. Ahmad, S. Akhtar, and M. Farooque. "Electromagnetic flat sheet forming by spiral type actuator coil." IOP Conference Series: Materials Science and Engineering 146 (August 2016): 012054. http://dx.doi.org/10.1088/1757-899x/146/1/012054.

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Akbar, Shakeel, Muhammad Adeel Aleem, Faisal Pirandad, Ahnaf Usman Zillohu, Muhammad Saifullah Awan, Ali Haider, and Muhammad Farooque. "Strip Size Optimization for Spiral Type Actuator Coil Used in Electromagnetic Flat Sheet Forming Experiment." Key Engineering Materials 875 (February 2021): 35–41. http://dx.doi.org/10.4028/www.scientific.net/kem.875.35.

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Flat spiral coil for electromagnetic forming system has been modelled in FEMM 4.2 software. Copper strip was chosen as material for designing the actuator coil. Relationship between height to width ratio (S-factor) of the copper strip and coil’s performance has been studied. Magnetic field intensities, eddy currents and Lorentz force were calculated for the coils that were designed using six different 'S-factor' values (0.65, 0.75, 1.05, 1.25, 1.54 and 1.75), keeping the cross-sectional area of strip same. Results obtained through simulation suggest that actuator coil with S-factor ~ 1 shows optimum forming performance as it exerts maximum Lorentz force (84 kN) on work piece. The same coils was fabricated and used for electromagnetic sheet forming experiments. Aluminum 6061 sheets of thickness 1.5 mm have been formed using different voltage levels of capacitor bank. Smooth forming profiles were obtained with dome heights 28, 35 and 40 mm in work piece at 800, 1150 and 1250 V respectively.
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Blums, Juris, G. Terlecka, and Ausma Vilumsone. "The Electrodynamic Human Motion Energy Converter with Planar Structure." Advanced Materials Research 222 (April 2011): 36–39. http://dx.doi.org/10.4028/www.scientific.net/amr.222.36.

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The performance of the electrodynamic human motion energy converter with planar structure is under investigation. The electrodynamic converter consists of a flat, spiral-shaped coil and a rectangular magnet that during human motion moves in respect to one another. During the motion of the rectangular magnet with a remanence 0.1 T over a flat, formed up as an Archimedes spiral coil with 25 turns, an average power of about 10 W is generated. The generator elements can both be deployed on a variety of clothing items which move relative to one another during the human motion, and also realizing the forced oscillation of the magnet during walking.
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Liao, Yanhua, and Xueqing Yuan. "Compensation topology for flat spiral coil inductive power transfer systems." IET Power Electronics 8, no. 10 (October 2015): 1893–901. http://dx.doi.org/10.1049/iet-pel.2014.0589.

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Mozzhukhin, G. V., A. V. Efremov, A. V. Bodnya, and V. V. Fedotov. "A Two-Spiral Flat Coil for Detecting 14N NQR Signals." Russian Physics Journal 48, no. 9 (September 2005): 978–83. http://dx.doi.org/10.1007/s11182-006-0013-0.

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Dissertations / Theses on the topic "Flat spiral coil"

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Paese, Evandro. "Conformação eletromagnética de chapas finas usando bobina espiral plana : modelagem com acoplamento eletromagnético." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2014. http://hdl.handle.net/10183/108496.

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O presente trabalho trata de uma modelagem eletromagneticamente acoplada e fracamente acoplada ao problema mecânico do processo de conformação eletromagnética (EMF). Este usa bobina espiral plana, aplicada na deformação de chapas finas e planas para obter geometrias finais rasas. Um método de solução numérica é usado para o problema eletromagnético, o qual foi desenvolvido no software Matlab e utiliza o software Abaqus/Explicit para verificação da geometria deformada após a aplicação da força transiente de origem eletromagnética. O método foca especificamente no cálculo da densidade de fluxo magnético em pontos específicos usando a lei de Biot-Savart e análise do circuito que modela o processo de conformação eletromagnética, sendo que as indutâncias deste circuito são calculadas e fazem o acoplamento entre os fenômenos elétricos e magnéticos. Os cálculos das correntes de descarga e induzidas e perfil da força de origem eletromagnética são realizados para o instante inicial, sem considerar o movimento da chapa. O perfil da força de origem eletromagnética ao longo da chapa é calculado para diversos instantes, sendo este um dos dados de entrada no software Abaqus/Explicit através de uma sub-rotina acessível ao usuário (VDLOAD) obtendo-se a geometria da chapa deformada. A rotina de cálculo discretiza o problema eletromagnético como um sistema de equações diferenciais ordinárias (ODE) para calcular a corrente de descarga da bobina atuadora e as induzidas na chapa metálica. Experimentos, sem chapa acoplada, e com chapa fixa ou deformando foram realizados com a aquisição da corrente de descarga, medição da densidade de fluxo magnético, velocidade de deformação e geometria da chapa deformada, demonstrando uma boa correlação com o método de cálculo proposto. O presente trabalho fornece importantes informações para o projeto de sistemas de conformação eletromagnética sem a necessidade de uma função da corrente de descarga como dado de entrada para solução do problema eletromagnético.
This thesis deals with modeling and numerical simulation electromagnetically coupled and loosely-coupled to the mechanical problem for process of the electromagnetic forming. This uses flat spiral coil, applied to the deformation of thin and flat sheet metal to obtain shallow end geometries. This method uses a numerical solution to the electromagnetic problem, which was developed in the software Matlab and uses the software Abaqus/Explicit for verification of the deformed geometry after applying of the transient force of origin electromagnetic. The method focuses specifically on the calculation of the magnetic flux density at specific points using the Biot-Savart law and circuit analysis that modeling of electromagnetic forming process and the inductances of this circuit are calculated and couple the electric and magnetic phenomena. Calculations of discharge and induced currents, profile force of origin electromagnetic are performed for the initial time, without considering the motion of the sheet metal. The profiles force of origin electromagnetic along the sheet metal is calculated for several instants, which are input data in software Abaqus/Explicit using a user-routine (VDLOAD) obtaining the deformed geometry of the sheet metal. The calculation routine discretizes the electromagnetic problem as a system of ordinary differential equations (ODE) to calculate the discharge current of the actuator coil and induced currents in the metal sheet. Experiments without coupled sheet metal, and fixed or deforming sheet metal were performed with the acquisition of the discharge current, measurement of magnetic flux density, velocity of movement and deformation geometry of the sheet metal, demonstrating a good correlation with the proposed method of calculation. This study provides important information for the design of the electromagnetic forming systems without the need for a function of discharge current as input for solution of the electromagnetic problem.
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Paese, Evandro. "Estampagem eletromagnética de chapas finas : viabilidade técnica." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2010. http://hdl.handle.net/10183/23932.

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Esta dissertação apresenta modelagem matemática e um método de solução numérica para problemas de conformação eletromagnética de chapas metálicas finas circulares utilizando uma bobina em espiral plana. O método foca especificamente o cálculo do campo eletromagnético gerado pela bobina e análise do circuito que modela o sistema de estampagem eletromagnética. A bobina plana é aproximada por círculos concêntricos carregando a corrente de descarga dos capacitores. Os cálculos das correntes induzidas e perfil da força eletromagnética na chapa e acoplamentos magnéticos entre a bobina e chapa metálica são realizados para o instante inicial, antes da deformação plástica da chapa. O método utiliza a lei de Biot-Savart, sendo que a solução das integrais obtidas para indução magnética é realizada através de métodos numéricos, considerando as simetrias do problema. Para verificação da modelagem matemática, da solução numérica e comprovação da viabilidade técnica deste processo, um dispositivo de estampagem eletromagnética foi desenvolvido e diversos experimentos foram realizados com chapas de alumínio. Os parâmetros investigados foram a espessura da chapa a ser deformada e a influência da presença de vácuo na cavidade da ferramenta. Os resultados experimentais demonstram concordância com os resultados da modelagem proposta. A presença de vácuo também demonstrou um incremento na deformação da chapa. A rotina desenvolvida no software Matlab fornece informações importantes para o processo e permite que se faça ajustes no dispositivo.
This dissertation presents a mathematical model and numerical method to solve the problems of electromagnetic forming of thin circular metal sheets by using a flat spiral coil. The method focuses specifically on the calculation of the electromagnetic field generated by the coil flat and circuit analysis modeling system electromagnetic forming. The flat coil is approximated by concentric circles carrying a discharge current of capacitors. The calculations of induced currents and profile of the electromagnetic force on the plate and magnetic coupling between the coil and sheet metal are made to the initial time, before the plastic deformation of the plate. The method uses the law of Biot-Savart, and the solution of the integral obtained for magnetic induction is performed by numerical methods, considering the symmetries of the problem. To verify the mathematical model, the numerical solution and proving the technical feasibility of this process, a electromagnetic forming device was developed and several experiments were made with aluminum plates. The parameters investigated were the thickness of the plate to be deformed and the influence of the vacuum in the cavity of the tool. The experimental results show agreement with the results of the proposed model. The presence of vacuum also showed an increase in the deformation of the plate. A routine developed in software Matlab provide important information for the process and allow to make adjustments on the device.
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Walek, Petr. "Magnetoterapeutický přístroj pro léčbu dětské mozkové obrny." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218726.

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Project Magnetotherapeutic device for Child Neurology in his forepart paies medical use of Pulsatile Magnetic Field. Summaries a therapeutic effects of field which is interacting with biotic issue and determines which of those effects are acceptable for treatment of Infantile Paralysis. Below it describes single Bio-Parametres of Pulsatile Magnetic Field and analyses reasons and effects of Infantile Paralysis. In second part is described a block diagram of magnetotherapeutic device for treatment of Infantile Paralysis. Described is principle of function of blocks. In third part is defined circuit solving of controlling, supervisory and generating part of magnetotherapeutic device. Function and wiring of components is described in detail. There is also created a Printed Circuit Board. Device is controlled by three microcontrollers, therefore there are described flowcharts and controlling programs for microcontrollers.
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Lin, Cheng-Hung, and 林政宏. "Research of Spiral Copper Coil Design for Flat Loudspeaker and Related Applications." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/6872ud.

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Morales, Santiago Adolfo. "Investigation of high strain rate behavior of metallic specimens using electromagnetic inductive loading." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-08-4032.

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Aerospace Engineering
The aim of this thesis is to explore the high strain rate behavior of metallic specimens using electromagnetic inductive loading as the means to inflict the required high strain rate deformation on laboratory scale specimens, allowing for controlled, repeatable experiments to be performed. Three separate experiments were designed and performed, using helical and spiral coils as the sources of radial and unidirectional loading. The first experiment evaluated the effect of applying a polymer coating on 30.5 mm diameter, Al 6061- O tube samples, in two lengths, 18 and 36 mm. The expanding tube experiment was used to apply a radial loading on the specimens and record the event. Several optical techniques were then used to evaluate the behavior of the samples. Coatings of polyurea and polycarbonate were used. It was observed that the polycarbonate coating seemed to have a more profound effect on the behavior of the metal, by applying a larger restraining pressure on the tube surface during the expansion process, and thereby modifying the stress state of the specimen. The second experiment looked to design an experimental arrangement to test the plane strain, high strain rate behavior of Al 6061-O tubes of different lengths. A 112 mm long solenoid was designed and manufactured, and testing was performed on 30.5 mm diameter Al 6061-O tubes in lengths of 50, 70 and 90 mm. It was observed that the coil behaved similar to shorter ones at low voltages and that the longer the specimen used, the more its deformation path approached a plane strain condition. Finally, a third experiment was performed to develop an experiment to accelerate a plate to high linear velocities, as a means to evaluate the use of a flat spiral coil as the driver for future experiments based upon electromagnetic inductive loading. A prototype coil was manufactured and installed into a converted expanding tube experimental setup. Three samples were tested in several sizes, and materials: aluminum and steel. Speeds in the range of 45 to 251 m/s were obtained, validating the apparatus as a viable method to provide a unidirectional loading.
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Conference papers on the topic "Flat spiral coil"

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Teng, Ma, Wang Chenyang, Wang Kai, and Luo Ping. "Design of multilayer flat spiral inductive coil for wireless power transfer." In 2016 IEEE 5th Global Conference on Consumer Electronics. IEEE, 2016. http://dx.doi.org/10.1109/gcce.2016.7800344.

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Kim, Daeyong, Hyeon Park, Ji Hoon Kim, Youngseon Lee, and Myoung-Gyu Lee. "Numerical Analysis on Electromagnetic Forming of Automotive Sheets with Flat Spiral Coil." In The 10th International Conference on Automotive Engineering. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2014. http://dx.doi.org/10.4271/2014-01-2013.

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Bhuyan, S., S. Sahoo, R. Kumar, and S. K. Panda. "Wireless energy transmission to piezoelectric component by flat spiral coil antenna-like structure." In 2010 IEEE International Conference on Sustainable Energy Technologies (ICSET). IEEE, 2010. http://dx.doi.org/10.1109/icset.2010.5684417.

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Spaggiari, Andrea, and Eugenio Dragoni. "Analytical and Numerical Modelling of Shape Memory Alloy Negator Springs for Long-Stroke Constant-Force Actuators." In ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/smasis2012-7964.

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This paper explores the merits of shape memory Negator springs as powering elements for solid state actuators. A Negator spring is a spiral spring made of strip of metal wound on the flat with an inherent curvature such that, in repose, each coil wraps tightly on its inner neighbour. The unique characteristic of Negator springs is the nearly-constant force needed to unwind the strip for very large, theoretically infinite deflections. Moreover the flat shape, having a high area over volume ratio, grants improved bandwidth compared to any solution with solid wires or helical springs. The SMA material is modelled as elastic in austenitic range while an exponential continuum law is used to describe the martensitic behaviour. The mathematical model of the mechanical behaviour of SMA Negator springs is provided and their performances as active elements in constant-force, long-stroke actuators are assessed. The SMA Negator spring is also simulated in a commercial finite element software, ABAQUS, and its mechanical behaviour is estimated through FE analyses. The analytical and the numerical prediction are in good agreement, both in martensitic and in austenitic range.
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Spaggiari, Andrea, Eugenio Dragoni, and Ausonio Tuissi. "Experimental Characterization and Modelling Validation of Shape Memory Alloy Negator Springs." In ASME 2013 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/smasis2013-3018.

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This paper is aimed at the experimental characterization and modelling validation of shape memory alloy (SMA) negator springs. A Negator spring is a spiral spring made of strip of metal wound on the flat with an inherent curvature such that, in repose, each coil wraps tightly on its inner neighbour. The main feature of a Negator springs is the nearly-constant force displacement behaviour in the unwinding of the strip. Moreover the stroke is very long, theoretically infinite as it depends only on the length of the initial strip. A Negator spring made in SMA is built and experimentally tested to demonstrate the feasibility of this actuator. The shape memory Negator spring behaviour is predicted both with an analytical model and with a a finite element software. In both cases the material is modelled as elastic in austenitic range while an exponential continuum law is used to describe the martensitic behaviour. The experimental results confirms the applicability of this kind of geometry to the shape memory alloy actuators and the analytical model is confirmed to be a powerful design tool to dimension and predict the spring behaviour both in martensitic and austenitic range, as well as the finite element model developed.
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Santalunai, Samran, Chanchai Thongsopa, and Thanaset Thosdeekoraphat. "An increasing the power transmission efficiency of flat spiral coils by using ferrite materials for wireless power transfer applications." In 2014 11th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON). IEEE, 2014. http://dx.doi.org/10.1109/ecticon.2014.6839838.

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Chang, Hyeonsoo, Chad Sipperley, David Nelson, and Chris Edwards. "Development of a Temporally Modulated Fuel Injector With Controlled Spray Dynamics." In ASME Turbo Expo 2001: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/2001-gt-0454.

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It is now well established that combustion instability in liquid-fueled gas turbines can be controlled through the use of active fuel modulation. What is less clear is the mechanism by which this is achieved. This results from the fact that in most fuel modulation strategies not only is the instantaneous mass flow rate of fuel affected but so to are the parameters which define the post-atomization spray that takes part in the combustion. Specifically, experience with piezoelectric modulated sprays has shown that drop size, velocity, cone angle, and patternation are all affected by the modulation process. This inability to decouple changes in the fueling rate from changes in the spray distribution makes understanding of the mechanism of instability control problematic. This paper presents the results of an effort to develop an injector which can provide temporal modulation of the fuel flow rate but without concomitant changes in spray dynamics. This is achieved using an atomization strategy which is insensitive to both fuel flow rate and combustor acoustics (an over-pressured spill-return nozzle) coupled with an actuator with flat frequency response (a low-mass voice coil). The design and development of the actuator (and its control system) are described, and a combination of Phase-Doppler Interferometry and imaging are used to establish its performance. Results show that the system is capable of producing sprays which have little variation in cone angle or spray distribution function despite variations in mass flow rate (number density) of greater than 50% over a range of frequencies of interest for control of combustion instability (10 Hz to 1 kHz).
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