Relevant bibliographies by topics / Approach law for magnetic saturation

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

Academic literature on the topic 'Approach law for magnetic saturation'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Approach law for magnetic saturation"

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Yamkane, Z., R. Fersi, F. Z. Rachid, R. Moubah, H. Lassri, N. Mliki, S. Alleg, M. Sajieddine, and L. Bessais. "Law of Approach to Magnetic Saturation in Nanocrystalline Pr2Co7Cx(x≤1): Effects of Carbonation." SPIN 10, no. 03 (August 14, 2020): 2050016. http://dx.doi.org/10.1142/s2010324720500162.

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We report on the effect of Carbon insertion on the microstructure and magnetic properties of nanocrystalline Pr2Co7Cx([Formula: see text]). The Pr2Co7Cx were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and physical property measurement system (PPMS9) Quantum Design. Mean field theory was utilized to depict the temperature dependence of magnetization and deduce the exchange interactions. The approach to saturation magnetization was as well used. The results were interpreted in the framework of random magnetic anisotropy model. From such analysis, some fundamental parameters were extracted.
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Devi, Elangbam Chitra, and Ibetombi Soibam. "Law of Approach to Saturation in Mn–Zn Ferrite Nanoparticles." Journal of Superconductivity and Novel Magnetism 32, no. 5 (August 3, 2018): 1293–98. http://dx.doi.org/10.1007/s10948-018-4823-4.

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Devi, Elangbam Chitra, and Ibetombi Soibam. "Magnetic properties and law of approach to saturation in Mn-Ni mixed nanoferrites." Journal of Alloys and Compounds 772 (January 2019): 920–24. http://dx.doi.org/10.1016/j.jallcom.2018.09.160.

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UTSUNOMIYA, Tomoaki, Hidekazu NISHIZAWA, Kiyoshi KANETA, and Hideaki KONDO. "A magnetic method for measuring stress based on law of approach to saturation magnetization." Journal of Advanced Science 1, no. 1 (1989): 79–81. http://dx.doi.org/10.2978/jsas.1.79.

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Zhang, Zhan Xin, Hui Li Li, Tao Liu, and Feng Ming Wang. "The Measurement for the Effective Anisotropy Constant of the Nanocomposite Permanent Magnetic Material Nd2Fe14B/α-Fe." Advanced Materials Research 189-193 (February 2011): 292–95. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.292.

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The effective anisotropy constant and the saturation magnetization in nano composite Nd2Fe14B/α-Fe have been calculated by the law of approach to saturation (LATS) method. The applicability of the method has been analyzed. The calculated result shows that the LATS method is suitable for the calculation of the effective anisotropy constant and the saturation magnetization in nano composite permanent magnetic materials.
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Hua, Bing, Nan Zhang, and Mohong Zheng. "Satellite magnetic/momentum wheel attitude control technology based on PIO cascade-saturation algorithm." World Journal of Engineering 18, no. 4 (March 26, 2021): 645–50. http://dx.doi.org/10.1108/wje-10-2020-0536.

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Purpose Taking into account the factors of torque saturation and angular velocity limitation during the actual attitude maneuver of the satellite, as well as the difficulty of parameter selection in the design of attitude control algorithm, the purpose of this paper is to propose a satellite magnetic/momentum wheel attitude control technology based on pigeon-inspired optimization (PIO) cascade-saturation control law optimization. Design/methodology/approach The optimal parameters are calculated through the PIO algorithm and then the parameters are used in the cascade-saturation control law to control the actuator findings-mathematical simulation results show that the cascade-saturation control law optimization algorithm based on PIO can shorten the adjustment time and reduce the steady-state error. Findings Compared with traditional attitude maneuver control with given parameters, the PIO algorithm can accurately calculate the optimal parameters needed to achieve the control objective and this method has better stability and higher accuracy. Originality/value The innovative PIO algorithm is used to calculate the optimal parameters, and the cascade saturation control law is used to control the actuator. Compared with the traditional algorithm, the regulation time is shortened and the steady-state error is reduced.
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Komogortsev, S. V., and R. S. Iskhakov. "Law of approach to magnetic saturation in nanocrystalline and amorphous ferromagnets with improved transition behavior between power-law regimes." Journal of Magnetism and Magnetic Materials 440 (October 2017): 213–16. http://dx.doi.org/10.1016/j.jmmm.2016.12.145.

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Utsunomiya, T., H. Nishizawa, and K. Kaneta. "Biaxial stress measurement using a magnetic probe based on the law of approach to saturation magnetization." NDT & E International 24, no. 2 (April 1991): 91–94. http://dx.doi.org/10.1016/0963-8695(91)90823-l.

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KUNO, Tomoko, Shunji SUZUKI, Kimiko URUSHIBATA, Kurima KOBAYASHI, Noritsugu SAKUMA, Kazuya YOKOTA, Masao YANO, Akira KATO, and Akira MANABE. "Effects of the Applied Magnetic Field for Measurements in the Law of Approach to Ferromagnetic Saturation (LAFS)." Journal of the Japan Society of Powder and Powder Metallurgy 63, no. 13 (2016): 1053–59. http://dx.doi.org/10.2497/jjspm.63.1053.

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Kronmüller, H., V. A. Ignatchenko, and A. Forkl. "Law of approach to magnetic saturation in inhomogeneous ferri- and antiferromagnets and in amorphous iron-rich Fe-Zr alloys." Journal of Magnetism and Magnetic Materials 134, no. 1 (May 1994): 68–74. http://dx.doi.org/10.1016/0304-8853(94)90074-4.

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Dissertations / Theses on the topic "Approach law for magnetic saturation"

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Oliveira, Neto Francisco de. "Caracterização estrutural e magnética do compósito cerâmico ZnO – CoFe2O4." Universidade Federal de Goiás, 2015. http://repositorio.bc.ufg.br/tede/handle/tede/5228.

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Submitted by Cláudia Bueno (claudiamoura18@gmail.com) on 2016-02-12T12:25:51Z No. of bitstreams: 2 Dissertação - Francisco de Oliveira Neto - 2015.pdf: 6608686 bytes, checksum: 00be4069bc90036c589c6c3fa9131408 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5)
Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2016-02-16T06:42:51Z (GMT) No. of bitstreams: 2 Dissertação - Francisco de Oliveira Neto - 2015.pdf: 6608686 bytes, checksum: 00be4069bc90036c589c6c3fa9131408 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5)
Made available in DSpace on 2016-02-16T06:42:51Z (GMT). No. of bitstreams: 2 Dissertação - Francisco de Oliveira Neto - 2015.pdf: 6608686 bytes, checksum: 00be4069bc90036c589c6c3fa9131408 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Previous issue date: 2015-08-12
Fundação de Amparo à Pesquisa do Estado de Goiás - FAPEG
Multiferroic materials that simultaneously exhibit two or more physical properties have increasingly raised the interest of the scientific and technological community to develop new multifunctional materials. The discuss all stages of manufacturing, morphological, structural and magnetic characterization of a multifunctional composite containing zinc oxide and cobalt ferrite. Thus, studies of ZnO, and the CoFe2O4 composite (0,80ZnO+0,20 CoFe2O4) initiated by the synthesis of nanosized powders by combustion reaction phases were performed. The compounds studied were sintered at different temperatures (1100 to 1250°C) to obtain relative density near to 90% of the theoretical density. Analysis by scanning electron microscopy, spectroscopy energy dispersive, vibrating sample magnometry and diffraction ray-X were made. Measurements of magnetic properties were conducted at room temperature (22°C) and high temperature (22°C to 700°C). In the samples, formation of ceramic structures was verified, the stoichiometry of the proposed chemical compounds was maintained and possibly the formation of a mixed zinc and cobalt ferrite to composite samples. In the sample of the composite sintered at 1250°C there was the formation of cubic zinc oxide. The magnetic behavior and magnetic anisotropy of the samples were similar, however, significant differences were observed in the values of the Curie temperature, coercive field, can assume different origins for the magnetic CoFe2O4 and the composite (0,80ZnO+0,20CoFe2O4) due, perhaps to the formation of a mixed ferrite.
Materiais multiferróicos que exibem simultaneamente duas ou mais propriedades físicas têm cada vez mais suscitado o interesse da comunidade científica e tecnológica para o desenvolvimento de novos materiais multifuncionais. Objetivou-se discutir todas as etapas de fabricação e caracterização morfológica, estrutural e magnética de um compósito multifuncional contendo óxido de zinco e ferrita de cobalto. Assim, foram realizados estudos sobre as fases das amostras de ZnO, CoFe2O4 e o compósito (0,80ZnO+0,20CoFe2O4) iniciados pela síntese de pós nanométricos por via de reação de combustão. Os compostos estudados foram sinterizados em diferentes temperaturas (1100 e 1250°C) obtendo densidades relativas próximas a 90% das densidades teóricas. Foram efetuadas análises por microscopia eletrônica de varredura, espectroscopia de energia dispersiva, difratometria de raio-X e magnometria de amostra vibrante. As medidas de propriedades magnéticas foram realizadas à temperatura ambiente (22°C) e em função da temperaturas (22°C à 700°C) (altas temperaturas). Em todas as amostras estudadas foi verificada a formação de estruturas cerâmicas, mantendo a estequiometria dos compostos químicos propostos e possivelmente a formação de uma ferrita mista de zinco e cobalto para as amostras do compósito. Para a amostra do compósito sinterizada a 1250°C verificou-se também a formação de óxido de zinco cúbico. O comportamento magnético e a anisotropia magnética das amostras foram similares, entretanto diferenças significativas foram observadas nos valores obtidos da temperatura de Curie, do campo coercitivo e do momento magnético total, podendo supor origens magnéticas diferentes para o CoFe2O4 e o compósito de 0,80ZnO+0,20CoFe2O4 devido a formação de uma ferrita mista.
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Banitalebi, Dehkordi Ali. "Improved models of electric machines for real-time digital simulation." 2010. http://hdl.handle.net/1993/3935.

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This thesis advances the state of the art in modeling electric machines in electro-magnetic transient simulation programs, particularly in real-time digital simulators. A new tool, developed in this thesis, expands the application of real-time digital simulators to closed-loop testing of protection relays designed to protect synchronous machines during internal faults. To evaluate the inductances of synchronous machines, a winding function approach was developed in this thesis which is capable of taking into account both the actual distribution of windings and the shape of the pole-arc. Factors such as MMF drop in the iron and effects of slots are compensated by evaluating the effective permeance function of the machine using experimentally measured values of d-, q- and 0- axis inductances. In this winding function approach, the effects of magnetic saturation are also included by considering the actual distribution of magneto-motive force in each loading condition of the machine. The inductances of an experimental machine are evaluated using this approach and validated using the finite-element method and laboratory measurements. This thesis also proposes an embedded phase-domain approach for time-domain simulation of the machine model in electromagnetic transients programs. The approach significantly improves the numerical stability of the simulations. Special numerical techniques are introduced, which speed up the execution of the algorithm as needed for real-time simulation. The machine model is validated in healthy and faulted conditions using simulations and laboratory experiments. Effects of damper grid representation on simulating turn-to-turn faults are investigated. The capability of this new real-time synchronous machine model in closed-loop testing of synchronous machines ground- faults protection relays is clearly demonstrated.
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Book chapters on the topic "Approach law for magnetic saturation"

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Gonzalez, J., M. Vazquez, E. T. de Lacheisserie, and G. Herzer. "Temperature Dependence of the Law of Approach to Magnetic Saturation in Nanocrystalline Ferromagnets." In Ordering and Disordering in Alloys, 473–82. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2886-5_49.

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Amaral, V. S., J. Filippi, and B. Barbara. "On the Law of Approach to Saturation in the Series of Amorphous Alloys a-DyxGd1−xNi." In NATO ASI Series, 399–404. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4899-2590-9_45.

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Worthy, Ben. "New Labour, new openness?" In The Politics of Freedom of Information. Manchester University Press, 2017. http://dx.doi.org/10.7228/manchester/9780719097676.003.0003.

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New Labour’s support for FOI was partially through willing embrace and partially through having it forced upon them. By the 1990s party backing, policy shifts and pragmatic opportunism had pushed the law centre stage. FOI was partly thrust upon the Labour Party leadership. In the legislature, FOI’s long support in the Labour Party had built into a powerful current of cross-party support. It was also powered by the spread of FOI around the world and, perhaps mostly importantly, by rapidly shifting technology and changing public expectations in the area of information provision. FOI was embraced by the leadership as very much a product of Labour’s eighteen years of out of power. FOI was an opportunistic policy that served to embarrass the secretive and ‘sleaze’-ridden Conservative government. It also chimed, after the experience of Thatcherism, with a current of Labour Party thought on breaking up power, and locked into a wide-ranging programme of constitutional reforms aimed at redesigning politics. More than this, the idea itself had obtained a powerful magnetic force. It was bound up with Labour’s sense of self and appealed as a policy that symbolised Labour’s radicalism and its new approach towards government and the people.
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Conference papers on the topic "Approach law for magnetic saturation"

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Venu Prakash, M. Pavan, S. P. Mathew, and S. N. Kaul. "Low-lying magnetic excitations, magnetic irreversibility and approach-to-saturation in nanocrystalline Ni." In PROCEEDING OF INTERNATIONAL CONFERENCE ON RECENT TRENDS IN APPLIED PHYSICS AND MATERIAL SCIENCE: RAM 2013. AIP, 2013. http://dx.doi.org/10.1063/1.4810114.

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Eyvazzadeh, Ramsin, Abdullatif Al-Omair, Majed Kanfar, and Achong Christon. "Low Resistivity Pay Carbonates: A Practical Approach to Quantify Water Saturation Using a Modified Archie's Model." In SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/206096-ms.

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Abstract A detailed description of a modified Archie's equation is proposed to accurately quantify water saturation within low resistivity/low contrast pay carbonates. The majority of previous work on low resistivity/low contrast reservoirs focused on clastics, namely, thin beds and/or clay effects on resistivity measurements. Recent publications have highlighted a "non-Archie" behavior in carbonates with complex pore structures. Several theoretical models were introduced, but new practical applications were not derived to solve this issue. Built upon previous theoretical research in a holistic approach, new models and workflows have been developed. Specifically, utilizing a combination of machine learning algorithms, nuclear magnetic resonance (NMR), core and geological data, field specific calibrated equations to compute water saturation (Sw) in complex carbonate formations are presented. Essentially, these new models partition the porosity into pore spaces and calculate their relative contribution to water saturation in each pore space. These calibrated equations robustly produce results that have proven invaluable in pay identification, well placement, and have greatly enhanced the ability to manage these types of reservoirs. This paper initially explains the theory behind the development of the analysis illustrating workflows and validation techniques used to qualify this methodology. A key benefit performing this research is the utilization of machine-learning algorithms to predict NMR derived values in wells that do not have NMR data. Several examples explore where results of this analysis are compared to dynamic testing, formation testing and laboratory measured samples to validate and demonstrate the utility of this new analysis.
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Panjaitan, J. "Novel Approach on Thin Bed Reservoir Case Study from Muda Formation, Natuna Basin." In Digital Technical Conference. Indonesian Petroleum Association, 2020. http://dx.doi.org/10.29118/ipa20-g-244.

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The presence of shale in thin beds reservoirs affects formation evaluation where the standard conventional log analyses are not designed to properly correct this effect. The conventional logging tools, with low vertical resolution, are not able to characterize these thin beds. This implies that log values do not represent the true bed or layer properties, but rather an average of multiple beds. Muda Formation are characterized by thin bed layers, made up of clastic rock sequences with dominant lithology of sandstone inter-bedded with shale, siltstone, and organic material as confirmed by drilling cuttings, logs response, and also supported by observation from sidewall cores. There are many uncertainties related to the presence of thin beds, primarily sand, silt, shale or their combination in term of their petrophysical properties and lateral extent. Inadequate reservoir characterization can cause significant amounts of oil and gas to remain unidentified. Accurate petrophysical parameters determination play an important role in the development plan of a field. The lateral and vertical variations in the petrophysical properties of the reservoir lead to different scenarios of the field development. The study of Muda Formation in this structure has integrated the sidewall core and log data. The contribution of the thin sand laminae to the average log response resulted in underestimating the porosity (Ф) and hydrocarbon saturation (Sh). The advanced measurement, like the resistivity anisotropy, proved quite useful as the vertical and horizontal resistivity across these beds leading to measurable electrical anisotropy. The resistivity measured perpendicular to the bedding is significantly higher than resistivity measured parallel to the bedding. The situation occurs due to high resistivity sand layers interbedded with low resistivity shale layers. The true sand porosity and hydrocarbon saturation were calculated using the laminated sand shale sequence and calibrated with core data. The study led to the more realistic petrophysical estimation of the sand shale laminae. A combination and integration of high-resolution image log for sand count, nuclear magnetic resonance (NMR) for porosity evaluation and triaxial resistivity for volumetric model through Laminated Sand Analysis approach are found useful to solve thin bed reservoir issue.
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Khan, Mohammad Ibrahim, Harish Datir, Subhadeep Sarkar, and Bjarne Rafaelsen. "DECIPHERING LOW RESISTIVITY PAY TO DERISK A COMMERCIAL DISCOVERY: CASE STUDY FROM THE NORWEGIAN SEA." In 2021 SPWLA 62nd Annual Logging Symposium Online. Society of Petrophysicists and Well Log Analysts, 2021. http://dx.doi.org/10.30632/spwla-2021-0006.

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The Cretaceous Cape Vulture prospect (Norwegian Sea, Norway) consisted of three Cretaceous sand levels: Cape Vulture Lower, Main, and Upper. The prospect was drilled in 2017, targeting seismic amplitude anomalies that represented a combination of reservoir facies and hydrocarbons. As the first well (6608/10-17S) proved hydrocarbons down to base reservoir in Cape Vulture Main and Upper, an appraisal well with two sidetracks were planned and drilled to determine the reservoir development, pressure communication and oil-water contact. A good understanding of the lateral variation within the reservoir was of importance to the technical economical evaluation of the discovery. The appraisal wells planned for a comprehensive coring and logging program. The main objectives were to reduce the uncertainty of estimated in place volumes by establishing the depth of the hydrocarbon-water contact, prove lateral pressure communication within each reservoir level, reduce the uncertainty of lateral and vertical reservoir distribution and quality, reduce the uncertainty of hydrocarbon saturation and understand the relationship between seismic amplitude anomalies and subsurface properties / fluids. The logging program included triaxial resistivity, nuclear spectroscopy, electrical images, nuclear magnetic resonance (NMR) complementing triple combo, followed by formation pressure measurements, and fluid sampling. The presence of clay minerals in varying amounts within the reservoirs depresses the resistivity measurement and leads to underestimation of the hydrocarbon saturation when using conventional Archie’s equation - a common petrophysical challenge in such conditions. The hydrocarbon saturation is an important parameter when calculating reserves and estimating whether a discovery is of commercial value. Hence, reducing the uncertainty span on hydrocarbon saturation (total and effective) and estimating the net pay thickness is critical. Using core data and advanced down-hole measurements to optimize a resistivity-based saturation model can reduce the uncertainty of the saturation estimates. Here we document the petrophysical evaluation of the data acquired, assessing heterolithic low resistivity pay with wireline log measurements combined with core data. Focus on the coring strategy, recommendations on sampling intervals for the core analysis, and key logging measurement requirements. The results show substantial improvements in the understanding of the hydrocarbon saturation, ultimately increasing in-place volume estimates. The integrated analysis, including NMR measurements, helps to delineate the fluid contacts, further reducing the uncertainty on the recoverable net pay thickness. The core data validate the independent log-based laminated sand analysis. This illustrates how an integrated approach combining core measurements, logs, and formation testing provide an accurate evaluation of low resistivity pay reservoirs, reducing the uncertainty in the technical economical evaluation.
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Yuanyuan, Li, Wang Hongyu, and Zhang Yanyan. "Simulation research on excitation control law based on large hydro-generator including magnetic saturation." In 2011 International Conference on Electrical Machines and Systems (ICEMS). IEEE, 2011. http://dx.doi.org/10.1109/icems.2011.6073825.

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Shaw, David C., and Joseph A. Dozzo. "Reducing Numerical Diffusion in the Modelling of Sharp Saturation Fronts: A Conservation - Law Approach." In SPE Latin America Petroleum Engineering Conference. Society of Petroleum Engineers, 1990. http://dx.doi.org/10.2118/21179-ms.

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Zhou, Pu, Yue Zhang, Zhen Zhen, Qiang Wang, and Hai-jun Feng. "Study on Vibration Characteristics of Induction Motor Under Load Considering Saturation of Magnetic Circuit." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-66807.

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The variation law of motor vibration with load under saturation of magnetic circuit is one of the focus of motor vibration research. T-type equivalent circuit method is shown to be a suitable engineering analysis way. In this paper, the variation of magnetic flux density under saturation state was analyzed by using a small induction motor, and a physical model of magnetic saturation and motor vibration was established by the way of T-shaped equivalent circuit. Based on the physical model, the vibration mechanism of the motor under the saturated magnetic circuit was analyzed and the motor vibration simulation with different load conditions was carried out by the finite element method. Finally, a vibration test rig for motor under load was built and the simulation results were verified by experiments. The results show that when the motor load is less than the rated load, the amplitudes of the electromagnetic force in the middle and high frequency band change little. When the load is close to or higher than the rated value, the harmonic components of electromagnetic force in the middle and high frequency bands increase, and the amplitudes gradually increases due to the saturation of the magnetic circuit. Therefore, in the low-noise motor design, motor torque performance and vibration noise performance should be considered to optimize the saturation control of the magnetic circuit.
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Enaworu, Efeoghene, Tim Pritchard, and Sarah J. Davies. "An Approach for Exploring the Application of the Flow Zone Index Concept in Describing Petrophysical Properties Using Available SCAL Data Relative Permeability." In SPE Nigeria Annual International Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/208244-ms.

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Abstract This paper describes a unique approach for exploring the Flow Zone Index (FZI) concept using available relative permeability data. It proposes an innovative routine for relating the FZI parameter to saturation end-points of relative permeability data and produces a better model for relative permeability curves. In addition, this paper shows distinct wettabilities for various core samples and validated functions between FZI and residual oil saturation (Sor), irreducible water saturation (Swi), maximum oil allowed to flow (Kro, max), maximum water allowed to flow (Krw, max),and mobile/recoverable oil (100-Swi-Sor). The wettability of the core samples were defined using cross-plots of relative permeability of oil (Kro), relative permeability of water (Krw), and water saturation (Sw). After classifying the data sets into their respective wettabilities based on these criteria, a stepwise non-linear regression analysis was undertaken to develop realistic correlations between the FZI parameter, initial water saturation and end-point relative permeability parameters. In addition, a correlation using Corey's type generalised model was developed using relative permeability data, with new power law constants and well defined curves. Other parameters, including Sor, Swi, Kro, max, Krw,max and mobile oil, were plotted against FZI and correlations developed for them showed unique well behaved plots with the exception of the Sor plot. A possible theory to explain this unexpected behaviour of the FZI Vs Sor cross plot was noted and discussed. These derived functions and established relationships between the FZI term and other petrophysical parameters such as permeability, porosity, water saturation, relative permeability and residual oil saturation can be applied to other wells or reservoir models where these key parameters are already known or unknown. These distinctive established correlations could be employed in the proper characterization of a reservoir as well as predicting and ground truthing petrophysical properties.
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Shi, Jianjun, Atul G. Kelkar, and Donald Soloway. "GPC-Based Stable Reconfigurable Control." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-42627.

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This paper presents development of multi-input multi-output (MIMO) Generalized Predictive Control (GPC) law and its application to reconfigurable control design in the event of actuator saturation. The stability of the GPC control law without reconfiguration is first established using Riccati-based approach and state-space formulation. A novel reconfiguration strategy is developed for the systems which have actuator redundancy and are faced with actuator saturation type failure. An elegant reconfigurable control design is presented with stability proof. A numerical example with application to reconfigurable flight control is presented to demonstrate the results presented in the paper.
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Cuadrado, D. G., S. Lavagnoli, and G. Paniagua. "Methodology to Correct the Magnetic Field Effect on Thin Film Measurements." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-42715.

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Machined ferrous metal components may carry a magnetic field, which in rotation disturb the output of electrical sensors. To minimize the effect on the electrical instrumentation, the rotating components are usually demagnetized. However, even after the demagnetization process, a residual magnetism unavoidably remains. This paper presents a methodology to predict the effects of a rotating magnetic field induced on thin-film measurements. In addition to the prediction of the magnetic effects, a procedure to correct the spurious variation in the readings of thin film gauges has been developed to enhance the fidelity of the measurements. An analytical model was developed to reproduce the bias on the electrical signal from sensors exposed to rotor airfoils with magnets. The model is based on the Biot-Savart law to generate the magnetic field, and the Faraday’s law to calculate the electromotive force induced along the measurement circuit. The model was assessed by means of controlled experiments varying the rotor tip clearance and rotational speed. The presented methodologies allowed the correction of the magnetic field effects. The raw signal of the thin film sensors, in the absence of any correction, is prone to deliver errors in the heat flux amounting to about 8% of the mean overall value. Thanks to the developed corrective approach, the residual magnetic effect contribution to the heat flux error would be 2% at most.
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