Artículos de revistas: "Magneto-Mechanical optimization"

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Tornincasa, Stefano, Maurizio Repetto, Elvio Bonisoli y Francesco Di Monaco. "Optimization of magneto-mechanical energy scavenger for automotive tire". Journal of Intelligent Material Systems and Structures 23, n.º 18 (20 de diciembre de 2011): 2055–64. http://dx.doi.org/10.1177/1045389x11430741.

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This article presents multidisciplinary optimization methods applied to the design and performance evaluation of a magneto-mechanical energy scavenger for automotive wireless tire sensors. Optimal performance strictly depends on source characteristics, volume, weight and power density targets, energy scavenger typology, technological and manufacturing capabilities, optimization and reliability of performance, environment requirements, and so on. Thus an optimization study has been conducted on equivalent viscous damping due to strong magneto-electrical-mechanical coupling. To do this, an optimization tool has been developed that maximizes the power output in specific working conditions by varying the number and size of coils.

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Meng, Wei Jia, Zhan Wen Huang, Yan Ju Liu, Xiao Rong Wu y Yi Sun. "Structural Optimization Design of MR Fluid Clutch". Materials Science Forum 546-549 (mayo de 2007): 1673–76. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.1673.

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Magnetorheological (MR) fluids are suspensions of micron sized ferromagnetic particles dispersed in varying proportions of a variety of non-ferromagnetic fluids. MR fluids exhibit rapid, reversible and significant changes in their rheological (mechanical) properties while subjected to an external magnetic field. In this paper, a double-plate magneto-rheological fluid (MRF) clutch with controllable torque output have been designed. Electromagnetic finite element analysis is used to optimize the design of the clutch by using the commercial FEA software ANSYS.

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Zhang, Tieshan y Zhong Ren. "Optimal Design of Machine Tool Vibration Reduction Based on Magneto-rheological Damper". Journal of Physics: Conference Series 2246, n.º 1 (1 de abril de 2022): 012038. http://dx.doi.org/10.1088/1742-6596/2246/1/012038.

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Abstract This paper takes the three - way redundant drive parallel machine tool as research object, designs a magneto-rheological damper with displacement amplification function and simulates the magnetic circuit saturation of the damper by the Ansys workbench finite element analysis software, so that the output of the damper comes to optimization. The research results show that the magnetic field distribution is more reasonable, and the mechanical properties of the damper are improved. The optimization method is feasible and effective.

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Vallone, G., B. Auchmann, M. Maciejewski y J. Smajic. "Magneto-Mechanical Optimization of Cross-Sections for $ \text{cos}(\theta)$Accelerator Magnets". IEEE Transactions on Applied Superconductivity 32, n.º 6 (septiembre de 2022): 1–5. http://dx.doi.org/10.1109/tasc.2022.3155528.

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Lee, Dong-Gun, Yun Cheol Kim y Dong Ryeol Lee. "Mechanical and magnetic optimization of a magneto-thermoelectric generator for thermal energy harvesting". Journal of the Korean Physical Society 78, n.º 8 (24 de marzo de 2021): 723–28. http://dx.doi.org/10.1007/s40042-021-00138-7.

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Apicella, Valerio, Carmine Stefano Clemente, Daniele Davino, Damiano Leone y Ciro Visone. "Magneto-mechanical optimization and analysis of a magnetostrictive cantilever beam for energy harvesting". Journal of Magnetism and Magnetic Materials 475 (abril de 2019): 401–7. http://dx.doi.org/10.1016/j.jmmm.2018.11.076.

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Takezawa, Akihiro, Jaewook Lee y Mitsuru Kitamura. "Design methodology of magnetic fields and structures for magneto-mechanical resonator based on topology optimization". Optimization and Engineering 19, n.º 1 (22 de abril de 2017): 19–38. http://dx.doi.org/10.1007/s11081-017-9356-3.

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Dapino, Marcelo J. y Suryarghya Chakrabarti. "Modeling of 3D Magnetostrictive Systems with Application to Galfenol and Terfenol-D Actuators". Advances in Science and Technology 77 (septiembre de 2012): 11–28. http://dx.doi.org/10.4028/www.scientific.net/ast.77.11.

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This work presents a unified approach to model three dimensional magnetostrictive transducers. Generalized procedures are developed for incorporating nonlinear coupled constitutive behavior of magnetostrictive materials into an electro-magneto-mechanical finite element modeling framework. The finite element model is based on weak forms of Maxwell's equations for electromagnetics and Navier's equations for mechanical systems. An implicit time integration scheme is implemented to obtain nonlinear dynamic system responses. The model is implemented into a finite element (FE) solver and applied to two case studies, a Galfenol unimorph actuator and a magnetohydraulic Terfenol-D actuator for active engine mounts. Model results are compared with experiments, and parametric analyses are conducted which provide guidelines for optimization of actuator design.

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Sun, Kyung Ho y Yoon Young Kim. "Layout design optimization for magneto-electro-elastic laminate composites for maximized energy conversion under mechanical loading". Smart Materials and Structures 19, n.º 5 (23 de marzo de 2010): 055008. http://dx.doi.org/10.1088/0964-1726/19/5/055008.

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Shen, Hongxian, Jingshun Liu, Huan Wang, Dawei Xing, Dongming Chen, Yanfen Liu y Jianfei Sun. "Optimization of mechanical and giant magneto-impedance (GMI) properties of melt-extracted Co-rich amorphous microwires". physica status solidi (a) 211, n.º 7 (7 de mayo de 2014): 1668–73. http://dx.doi.org/10.1002/pssa.201431072.

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Desvaux, M., B. Multon, H. Ben Ahmed y S. Sire. "Magneto-mechanical analysis of magnetic gear pole pieces ring from analytical models for wind turbine applications". Wind Engineering 42, n.º 4 (11 de julio de 2018): 276–85. http://dx.doi.org/10.1177/0309524x18777314.

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This article deals with the structural behavior of a multi-bar system which maintains pole pieces in a concentric magnetic gear. Simplified analytic magnetic and mechanical models of the system are proposed in order to be integrated in a multi-criteria global optimization for the sizing of a magnetic gear in wind power applications. For this purpose, the reduction of the computation time is taken into account. The geometry of the support bar subsystem is defined and a Q bar structure is proposed. The magnetic study is based on Maxwell’s equations and subdomain method in order to determine variable radial and tangential magnetic loads. The mechanical study is based on a multibody model with different bars stiffnesses which are determined from a one-dimensional model. Variable radial and tangential magneto-mechanical pole pieces loads (magnetic load and weight) are also considered. An example of a magnetic gear with 172 pole pieces (i.e. 6-MW wind turbine) is proposed to analyze the mechanical behavior and also the computation time.

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Ostaszewska-Liżewska, Anna, Michał Nowicki, Roman Szewczyk y Mika Malinen. "A FEM-Based Optimization Method for Driving Frequency of Contactless Magnetoelastic Torque Sensors in Steel Shafts". Materials 14, n.º 17 (1 de septiembre de 2021): 4996. http://dx.doi.org/10.3390/ma14174996.

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This paper presents a novel finite element method (FEM) of optimization for driving frequency in magneto-mechanical systems using contactless magnetoelastic torque sensors. The optimization technique is based on the generalization of the axial and shear stress dependence of the magnetic permeability tensor. This generalization creates a new possibility for the determination of the torque dependence of a permeability tensor based on measurements of the axial stress on the magnetization curve. Such a possibility of quantitative description of torque dependence of a magnetic permeability tensor has never before been presented. Results from the FEM-based modeling method were validated against a real magnetoelastic torque sensor. The sensitivity characteristics of the model and the real sensor show a maximum using a driving current of similar frequency. Consequently, the proposed method demonstrates the novel possibility of optimizing magnetoelastic sensors for automotive and industrial applications.

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Xingjian Jia, Changlin Run, Changbao Chu. "Magneto-Mechanical Coupling Analysis of Automobile Brake by Wire System Based on Giant-Magnetostrictive Actuator". Journal of Electrical Systems 20, n.º 2 (4 de abril de 2024): 441–59. http://dx.doi.org/10.52783/jes.1197.

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Addressing the drawbacks of traditional automotive braking systems, including long hydraulic lines, heavy weight, and slow response speed, a new type brake by wire system based on giant-magnetostrictive material is proposed, which consists of giant-magnetostrictive actuator module and mechanical drive module. In this paper, CATIA software is used to establish a three-dimensional model of the brake. In order to verify the reliability of the model, giant-magnetostrictive actuator is taken as the research object, and COMSOL software is used to simulate different working conditions of automobile braking. A Magneto-mechanical coupling model was established and Magneto-mechanical coupling analysis of the actuator was carried out. The simulation results show that the aluminum shell material is superior to the 45 steel shell material. The inductance direction of the actuator is approximately elliptical from top to bottom, with uniform distribution of magnetic flux density and stress. The output stress is 5e4N/m2, and the maximum elongation is 0.1071mm. Finally, the driving efficiency of GMA was verified on an optical isolation platform, and comparative experiments were conducted before and after optimization using instruments such as laser displacement samplers, Tesla meters, and force sensors. The experimental results indicate that by optimizing the housing material and structure of the actuator, the displacement increased from 0.05188mm to 0.1003mm, magnetic induction increased from 42.9mT to 79.9mT, resulting in an increase of 41.6% and 42.7% respectively, and the maximum output force was 4752.3N. It makes a certain contribution to the application of GMA to automotive braking field and further proves the effectiveness of GMA in the application of automobile brake by wire system.

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Bagherinia, Mehrdad y Stefano Mariani. "Stochastic Effects on the Dynamics of the Resonant Structure of a Lorentz Force MEMS Magnetometer". Actuators 8, n.º 2 (30 de abril de 2019): 36. http://dx.doi.org/10.3390/act8020036.

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Resonance features of slender mechanical parts of Lorentz force MEMS magnetometers are affected by the (weakly) coupled thermo-electro-magneto-mechanical multi-physics governing their dynamics. We recently showed that reduced-order models for such parts can be written in the form of the Duffing equation, whose nonlinear term stems from the mechanical constraint on the vibrations and is affected by the driving voltage. As some device performance indices vary proportionally to the amplitude of oscillations at resonance, an optimization of the operational conditions may lead to extremely slender, imperfection-sensitive movable structures. In this work, we investigate the effects of imperfections on the mechanical response of a single-axis magnetometer. At the microscopic length-scale, imperfections are given in terms of uncertainties in the values of the over-etch depth and of the Young’s modulus of the vibrating polycrystalline silicon film. Their effects on the nonlinear structural dynamics are investigated through a Monte Carlo analysis, to show how the output of real devices can be scattered around the reference response trend.

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Akhnoukh, Amin, Ahmed Fady Farid, Ahmed M. M. Hasan y Youssef F. Rashed. "Adjustment of Tall Building Behavior by Guided Optimization of Magneto-Rheological Damper Control Parameters". CivilEng 4, n.º 2 (26 de mayo de 2023): 596–617. http://dx.doi.org/10.3390/civileng4020035.

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Magneto-rheological dampers (MR-Dampers) are increasingly being used in construction applications to reduce the dynamic response of structures to seismic activities or severe wind loading. Sensors attached to the structure will signal the computer to supply the dampers with an electric charge that transfers the MR fluid to a near-solid material with different physical and mechanical properties (viscoelastic behavior). Control algorithms govern the fluid to near-solid conversion, which controls the behavior of the damper and the performance of the structure under the seismic or wind loading event. The successful optimization of control parameters minimizes the overall structural response to dynamic forces. The main objective of this research is to change the output behavior of specific floors within a building subjected to seismic excitation by optimizing the MR-Damper control parameters to impact the behavior of a specific floor or number of floors within the building. The adjustment of control parameters to attain this objective was validated in multiple case studies throughout this research. The successful implementation of the research outcome will result in optimized MR-damper design to meet the performance-based criteria of building projects.

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Pineda-Arciniega, Manuel, Marco A. Arjona, Concepcion Hernandez y Rafael Escarela-Perez. "Numerical Modeling and Analysis of an Electromagnetic Device Using a Weakly Coupled Magnetostatic-Mechanical Formulation and the 2D Finite Element Method". Energies 16, n.º 5 (24 de febrero de 2023): 2182. http://dx.doi.org/10.3390/en16052182.

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This paper presents a methodology to program the weak coupling between magnetic and structural vector fields in an electromagnetic device modeled in two dimensions. The magneto-mechanical coupling phenomenon is present in electromagnetic devices where magnetic forces cause displacements in metallic materials. This work proposes a numerical solution to this problem by applying the 2D finite element method to the governing equations of this coupled multiphysics phenomenon. The well-known formulation yields accurate results; however, it is often not properly integrated into a computer program. This manuscript proposes a flexible and intuitive methodology for the implementation of the complex mathematics involved in this phenomenon into a computer program. The computer code receives the input parameters, discretizes the geometry by generating a 2D finite mesh, solves the resulting equations using the finite element method, and finally exports the results of the magnetic ang mechanical fields. The modeling is performed using an open-source platform for programming the finite element method in the programming language Python, and afterwards, the results are compared against a commercial software as validation of the proposed numerical approach. The novel magneto-mechanical coupling methodology is used to solve an engineering application, namely an electromagnetic actuator.

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Wang, Quan, Kyung-Bum Kim, Sang-Bum Woo, Yooseob Song y Tae-Hyun Sung. "A Magneto-Mechanical Piezoelectric Energy Harvester Designed to Scavenge AC Magnetic Field from Thermal Power Plant with Power-Line Cables". Energies 14, n.º 9 (22 de abril de 2021): 2387. http://dx.doi.org/10.3390/en14092387.

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Piezoelectric energy harvesters have attracted much attention because they are crucial in portable industrial applications. Here, we report on a high-power device based on a magneto-mechanical piezoelectric energy harvester to scavenge the AC magnetic field from a power-line cable for industrial applications. The electrical output performance of the harvester (×4 layers) reached an output voltage of 60.8 Vmax, an output power of 215 mWmax (98 mWrms), and a power density of 94.5 mWmax/cm3 (43.5 mWrms/cm3) at an impedance matching of 5 kΩ under a magnetic field of 80 μT. The multilayer energy harvester enables high-output performance, presenting an obvious advantage given this improved level of output power. Finite element simulations were also performed to support the experimental observations. The generator was successfully used to power a wireless sensor network (WSN) for use on an IoT device composed of a temperature sensor in a thermal power station. The result shows that the magneto-mechanical piezoelectric energy harvester (MPEH) demonstrated is capable of meeting the requirements of self-powered monitoring systems under a small magnetic field, and is quite promising for use in actual industrial applications.

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Zhao, Zheng Long, Zhong Bo He, Dong Wei Li, Guang Ming Xue y Zhao Shu Yang. "Design and Magnetic Field Simulation of Giant Magnetostrictive Bone Conduction Pronunciation Vibrator". Advanced Materials Research 1070-1072 (diciembre de 2014): 1291–94. http://dx.doi.org/10.4028/www.scientific.net/amr.1070-1072.1291.

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Giant magnetostrictive material (GMM) has the characteristics of big magneto-mechanical coupling coefficient, enormous strain and broad frequency response, which is widely used in audio and ultrasonic technology, ultra precision machining, testing technology, fluid control, vibration control and all kinds of sensors in recent years. This paper introduces some of the good qualities of GMM, compared with electromagnetic and piezoelectric materials, which are used extensively for bone conduction hearing device at present; a bow type giant magnetostrictive bone conduction pronunciation vibrator with simple structure and reliable performance is designed; the paper focuses on establishing the vibrator model and the simulation of ANSYS electromagnetics model; the radial magnetic field distribution is also analyzed. All the work provides reference for structure optimization and the selection of coupling materials for the vibrator.

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Mohammadimehr, M., SM Akhavan Alavi, SV Okhravi y SH Edjtahed. "Free vibration analysis of micro-magneto-electro-elastic cylindrical sandwich panel considering functionally graded carbon nanotube–reinforced nanocomposite face sheets, various circuit boundary conditions, and temperature-dependent material properties using high-order sandwich panel theory and modified strain gradient theory". Journal of Intelligent Material Systems and Structures 29, n.º 5 (15 de agosto de 2017): 863–82. http://dx.doi.org/10.1177/1045389x17721048.

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In this article, based on high-order sandwich panel theory and modified strain gradient theory, free vibration analysis of a micro-magneto-electro-elastic sandwich panel with a transversely flexible core and functionally graded carbon nanotube–reinforced nanocomposite face sheets is investigated. Also, the influences of temperature-dependent material properties and various circuit boundary conditions such as open and closed are considered in this study. Carbon nanotubes are arranged in longitudinal direction inside polyvinylidene fluoride matrix with various functionally graded (FG) distributions such as uniform, FG-V, FG-A, FG-X, and FG-O in the face sheets. The generalized rule of mixture is employed to predict mechanical, electrical, magnetic, and thermal properties of micro-sandwich composite panel. The classical shell theory and an elasticity high-order theory are used for the face sheets and the core, respectively. Then, the governing equations of motion are derived using Hamilton’s principle. In this article, the influences of the volume fraction, the various distributions of carbon nanotubes, the multi-physical fields, open- and closed-circuit boundary conditions, the material length scale parameters, different face sheet and core thicknesses, and temperature changes on the natural frequency are investigated, and the obtained results show that these influences play an important role in the natural frequencies and can be used in order to prevent the resonance phenomenon and also for manufacturing process design and optimization of micro-magneto-electro-elastic composite sandwich cylindrical panels.

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Trilli, Jordan, Laura Caramazza, Patrizia Paolicelli, Maria Antonietta Casadei, Micaela Liberti, Francesca Apollonio y Stefania Petralito. "The Impact of Bilayer Rigidity on the Release from Magnetoliposomes Vesicles Controlled by PEMFs". Pharmaceutics 13, n.º 10 (16 de octubre de 2021): 1712. http://dx.doi.org/10.3390/pharmaceutics13101712.

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Stimuli-sensitive nanocarriers have recently been developed as a powerful tool in biomedical applications such as drug delivery, detection, and gene transfer techniques. Among the external triggers investigated, low intensity magnetic fields represent a non-invasive way to remotely control the release of compounds from a magneto-sensitive carrier. Magnetoliposomes (MLs), i.e., liposomes entrapping magnetic nanoparticles (MNPs), are studied due to their capacity to transport hydrophobic and hydrophilic agents, their easy production, and due to the ability of MNPs to respond to a magnetic actuation determining the triggered release of the encapsulated compounds. Here we investigated the design and optimization of the MLs to obtain an efficient on-demand release of the transported compounds, due to the magneto-mechanical actuation induced by applying low-intensity pulsed electromagnetic fields (PEMFs). In particular we studied the effect of the bilayer packing on the ability of MLs, with oleic acid-coated MNPs encapsulated in the bilayer, to respond to PEMFs application. Three kinds of MLs are produced with an increasing rigidity of the bilayer, defined as Liquid Disorder, Liquid Order, and Gel MLs and the delivery of a hydrophilic dye (as a model drug) is investigated. Results demonstrate the efficacy of the magnetic trigger on high-ordered bilayers, which are unable to dampen the perturbation produced by MNPs motion.

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Liang, Huijun, Jie Li, Yongsheng Wang, Mingkun Liu, Jie Fu, Lei Luo y Miao Yu. "Multi-Physics Simulation and Experimental Verification of Magnetorheological Damper with Additional Stiffness". Actuators 12, n.º 6 (16 de junio de 2023): 251. http://dx.doi.org/10.3390/act12060251.

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Single-rod magneto-rheological dampers (MRD) have the advantages of a simple mechanism, high reliability, and broad application range. They are widely used in various semi-active vibration control fields. However, their working mode requires a compensating mechanism to perform volume compensation on the rod, leading to additional stiffness for the system. Ignoring this point makes it tough to establish an accurate mechanical model to describe its performance in the design stage, affecting its application. To address this issue, this study proposes a multi-physics simulation model based on gas compensation for single-rod MRD to characterize their mechanical performance accurately. Firstly, the mechanism and mechanical model of the single-rod gas compensation MRD are introduced. Secondly, considering that its performance is affected by the coupling effect of multiple physical fields, including magnetic, flow, and solid mechanics fields, the control equations and boundary conditions of each field are analyzed separately, and a multi-physics coupling simulation model is established by COMSOL. In particular, the gas compensation unit is considered in the multi-physics simulation model. The effect of the compensating mechanism on the mechanical performance of the damper under different excitation speeds, currents, and initial pressures is analyzed. Finally, the accuracy of the proposed method is verified through the demonstration power test. The results show that the simulation can describe the additional stiffness in the damper. The average error between experimental value and simulation value is 7%. This demonstrates the degree of agreement between the experiment and simulation.

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Allocca, Luigi, Daniele Davino, Alessandro Montanaro y Ciro Visone. "Proof of Principle of a Fuel Injector Based on a Magnetostrictive Actuator". Actuators 10, n.º 9 (14 de septiembre de 2021): 237. http://dx.doi.org/10.3390/act10090237.

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One of the goals of modern internal combustion engines is the NOx-soot trade-off, and this would be better achieved by a better control of the fuel injection. Moreover, this feature can be also useful for high-performance hydraulic systems. Actual fuel injection technology either allows only the control of the injection time or it is based on very complex mechanical-hydraulic systems, as in the case of piezo-actuators. This work describes the basic steps that brought the authors to the realization of a concept fuel injector based on a Terfenol-D magnetostrictive actuator that could overcome the previous issues, being both simple and controllable. The study provides the design, development, and a feasibility analysis of a magnetostrictive actuator for fuel injection, by providing a basic magneto-static analysis of the actuator, the adaptation of a suitable standard fuel injector, and its experimental testing in a lab environment, with different shapes and amplitude of the reference signal to follow.

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Khan, M. Ijaz y Faris Alzahrani. "Binary chemical reaction with activation energy in dissipative flow of non-Newtonian nanomaterial". Journal of Theoretical and Computational Chemistry 19, n.º 03 (mayo de 2020): 2040006. http://dx.doi.org/10.1142/s0219633620400064.

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This paper deals with the entropy optimization and heat transport of magneto-nanomaterial flow of non-Newtonian (Jeffrey fluid) towards a curved stretched surface. MHD fluid is accounted. The modeling of energy expression is developed subject to Brownian diffusion, Joule (Ohmic) heating, thermophoresis and viscous dissipation. Total entropy rate is discussed with the help of fluid friction irreversibility, mass transfer irreversibility, Joule heating irreversibility and heat transfer irreversibility. Binary chemical reaction with the smallest amount of activation energy is further considered. The governing equations of Jeffrey fluid with effects of hydrodynamic, thermal radiation, heat and mass transfer were solved through built-in-shooting method. The flow variables on the entropy rate, velocity field, concentration, Bejan number, skin friction coefficient and temperature are physically discussed through various graphs. The outcomes reveal that the entropy rate increases with an enhancement in curvature parameter. Such obtained outcomes help in mechanical and industrial engineering sciences. Moreover, the velocity and temperature decays versus ratio of relaxation to retardation times are also noticed.

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Joseph, Joel, Makoto Ohtsuka, Hiroyuki Miki y Manfred Kohl. "Resonant Self-Actuation Based on Bistable Microswitching". Actuators 12, n.º 6 (13 de junio de 2023): 245. http://dx.doi.org/10.3390/act12060245.

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We present the design, simulation, and characterization of a magnetic shape-memory alloy (MSMA) film actuator that transitions from bistable switching to resonant self-actuation when subjected to a stationary heat source. The actuator design comprises two Ni-Mn-Ga films of 10 µm thickness integrated at the front on either side of an elastic cantilever that moves freely between two heatable miniature permanent magnets and, thus, forms a bistable microswitch. Switching between the two states is induced by selectively heating the MSMA films above their Curie temperature Tc. When continuously heating the permanent magnets above Tc, the MSMA film actuator exhibits an oscillatory motion in between the magnets with large oscillation stroke in the frequency range of 50–60 Hz due to resonant self-actuation. A lumped-element model (LEM) is introduced to describe the coupled thermo-magnetic and magneto-mechanical performance of the actuator. We demonstrate that this performance can be used for the thermomagnetic energy generation of low-grade waste heat (T < 150 °C) with a high power output per footprint in the order of 2.3 µW/cm2.

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Kandev, N. P. "Modeling and experimental study of induction heating of moving bronze blocks". Journal de Physique IV 120 (diciembre de 2004): 713–18. http://dx.doi.org/10.1051/jp4:2004120082.

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This paper discusses a new method for electrical heating of moving bronze blocks that are used in a copper anode continuous casting machines. Until recently, the only means of heating has been the use of natural gas burners. This method however is inefficient, noisy, and the waste heat involved is very difficult to manage. An efficient method, using induction heating of a thin ferromagnetic layer bonded to the top of the bronze blocks was proposed to replace the natural gas burners.This method permits an excellent magnetic coupling, and therefore a very efficient transfer of energy into the ferromagnetic layer and then its thermal transfer to the bronze blocks. A specialized software Flux 2D has been used for computer simulation of coupled magneto-dynamic and thermal processes in design and optimization of the induction heating process. A study has been done on different frequencies, coil design and dimensions. A special one-side pancake inductor, using a magnetic field concentrator, was used to test the proposed method. This inductor showed very good electrical and mechanical performances.

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Gao, Xiang, Junchuan Niu, Ruihao Jia y Zhihui Liu. "Influential characteristics of electromagnetic parameters on self-powered MR damper and its application in vehicle suspension system". Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 234, n.º 1 (27 de agosto de 2019): 38–49. http://dx.doi.org/10.1177/1464419319870338.

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In order to reuse the energy dissipated by magneto-rheological (MR) damper, a self-powered MR damper is designed and analyzed theoretically. The main thrust of this work is establishing the mechanical-electromagnetic coupling model of quarter vehicle suspension based on self-powered MR damper, whilst the energy conversion efficiency of self-powered MR damper with electromagnetic parameters changing is investigated. The magnetic circuit model is formulated firstly. The influence of electromagnetic parameters on current in MR damper is analyzed systemically in frequency domain. A multi-objective optimization method is performed to determine the electromagnetic parameters. Subsequently a quarter vehicle suspension system with self-powered MR damper is introduced. The mechanical-electromagnetic coupling model is established. The frequency response function is derived under random road excitation. The vibration isolation capability of the proposed quarter vehicle suspension system is addressed in time and frequency domain respectively. Compared to passive control, the amplitude of sprung mass velocity, acceleration and transmissibility are reduced by 51%, 78% and about 10 dB in time and frequency domain respectively. Finally the energy conversion efficiency of self-powered MR damper with magnetic parameters changing under random road excitation is discussed. The vibration isolation performance of self-powered MR damper is more effective than passive control, especially in resonance range of the suspension system.

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García, Guillermo, D. Marene Larruskain y Agurtzane Etxegarai. "Modelling of Resistive Type Superconducting Fault Current Limiter for HVDC Grids". Energies 15, n.º 13 (23 de junio de 2022): 4605. http://dx.doi.org/10.3390/en15134605.

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The protection of high voltage direct current (HVDC) grids is a challenge considering that the protection system must detect, locate, and interrupt large fault currents in a few milliseconds. Resistive type superconducting fault current limiters (R-SFCL) can help solve that difficult task, reducing the extremely demanding ratings of HVDC circuit breakers. This paper presents different approaches to model R-SFCLs in order to analyze their suitability for assessing the performance of HVDC grid protection, including the step model, the exponential model, the RQ model, and the magneto-thermal model. In the first instance, the R-SFCL models are evaluated in a test grid to analyze their parameterisation and select the most adequate model for the study of HVDC grids. The RQ model is finally chosen for its simplicity but closer behavior to the magneto thermal model in terms of fault resistance dependency and resistance evolution curve. Then, the performance of an RQ type R-SFCL model in conjunction with a mechanical circuit breaker is evaluated in a multiterminal HVDC grid with different fault cases. This way, fault currents are greatly decreased as well as circuit breaker requirements. Hence, the R-SFCL under study enables a reliable protection of the HVDC grid.

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Korde, Umesh A. "Use of Magnetostrictive Actuators for Wave Energy Conversion with Improvised Structures". Energies 16, n.º 4 (12 de febrero de 2023): 1835. http://dx.doi.org/10.3390/en16041835.

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This paper presents work on a wave energy device with an on-board power take-off based on a magnetostrictively actuated deformable structure. Such devices potentially could be used in low-cost, short-term expeditionary operations. The paper discusses an analytical model that describes the heave oscillations of a buoy with two inclined, overhanging beams with magnetostrictive strips affixed to them. This work comprises the first steps toward an analytical model that would enable potential users to obtain quick power estimates at the planning stage. Here, the fully nonlinear magneto-mechanical-electrical constitutive relations are linearized about a desirable operating point, and a coupled dynamic model is derived using a variational formulation that includes buoy heave, flexural oscillations of the two beams, and the voltage response of the magnetostrictive strips. Energy conversion performance in wind-sea-dominated Pierson–Moskowitz spectra is found to be modest. However, present results also indicate that performance could be improved with suitable mechanical modifications.

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Yang, Yuxin, Qiang Yin, Changsheng Li, Haojie Li y He Zhang. "Simulation and Experimental Verification of Magnetic Field Diffusion at the Launch Load during Electromagnetic Launch". Sensors 23, n.º 18 (21 de septiembre de 2023): 8007. http://dx.doi.org/10.3390/s23188007.

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The unique magnetic field environment during electromagnetic launch imposes higher requirements on the design and protection of the internal electronic system within the launch load. This low-frequency, Tesla-level extreme magnetic field environment is fundamentally distinct from the Earth’s geomagnetic field. The excessive change rate of magnetic flux can readily induce voltage within the circuit, thus disrupting the normal operation of intelligent microchips. Existing simulation methods primarily focus on the physical environments of rails and armatures, making it challenging to precisely compute the magnetic field environment at the load’s location. In this paper, we propose a computational rail model based on the magneto–mechanical coupling model of a railgun. This model accounts for the dynamic current distribution during the launch process and simulates the magnetic flux density distribution at the load location. To validate the model’s accuracy, three-axis magnetic sensors were placed in front of the armature, and the dynamic magnetic field distribution during the launch process was obtained using the projectile-borne-storage testing method. The results indicate that compared to the previous literature methods, the approach proposed in this paper achieves higher accuracy and is closer to experimental results, providing valuable support for the design and optimization of the launch load.

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Tsakyridis, Georgios y Nikolaos I. Xiros. "Dynamics and Control of a Magnetic Transducer Array Using Multi-Physics Models and Artificial Neural Networks". Sensors 21, n.º 20 (13 de octubre de 2021): 6788. http://dx.doi.org/10.3390/s21206788.

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A linear mechanical oscillator is non-linearly coupled with an electromagnet and its driving circuit through a magnetic field. The resulting non-linear dynamics are investigated using magnetic circuit approximations without major loss of accuracy and in the interest of brevity. Different computational approaches to simulate the setup in terms of dynamical system response and design parameters optimization are pursued. A current source operating in baseband without modulation directly feeds the electromagnet, which consists commonly of a solenoid and a horseshoe-shaped core. The electromagnet is then magnetically coupled to a mass made of soft magnetic material and attached to a spring with damping. The non-linear system is described by a linearized steady-space representation while is examined for controllability and observability. A controller using a pole placement approach is built to stabilize the element. Drawing upon the fact that coupling works both ways, enabling estimation of the mass position and velocity (state variables) by processing the induced voltage across the electromagnet, a state observer is constructed. Accurate and fast tracking of the state variables, along with the possibility of driving more than one module from the same source using modulation, proves the applicability of the electro-magneto-mechanical transducer for sensor applications. Next, a three-layer feed-forward artificial neural network (ANN) system equivalent was trained using the non-linear plant-linear controller-linear observer configuration. Simulations to investigate the robustness of the system with respect to different equilibrium points and input currents were carried out. The ANN proved robust with respect to position accuracy.

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Tsakyridis, Georgios y Nikolaos I. Xiros. "Dynamics and Control of a Magnetic Transducer Array Using Multi-Physics Models and Artificial Neural Networks". Sensors 21, n.º 20 (13 de octubre de 2021): 6788. http://dx.doi.org/10.3390/s21206788.

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A linear mechanical oscillator is non-linearly coupled with an electromagnet and its driving circuit through a magnetic field. The resulting non-linear dynamics are investigated using magnetic circuit approximations without major loss of accuracy and in the interest of brevity. Different computational approaches to simulate the setup in terms of dynamical system response and design parameters optimization are pursued. A current source operating in baseband without modulation directly feeds the electromagnet, which consists commonly of a solenoid and a horseshoe-shaped core. The electromagnet is then magnetically coupled to a mass made of soft magnetic material and attached to a spring with damping. The non-linear system is described by a linearized steady-space representation while is examined for controllability and observability. A controller using a pole placement approach is built to stabilize the element. Drawing upon the fact that coupling works both ways, enabling estimation of the mass position and velocity (state variables) by processing the induced voltage across the electromagnet, a state observer is constructed. Accurate and fast tracking of the state variables, along with the possibility of driving more than one module from the same source using modulation, proves the applicability of the electro-magneto-mechanical transducer for sensor applications. Next, a three-layer feed-forward artificial neural network (ANN) system equivalent was trained using the non-linear plant-linear controller-linear observer configuration. Simulations to investigate the robustness of the system with respect to different equilibrium points and input currents were carried out. The ANN proved robust with respect to position accuracy.

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Atkinson, H. V. y P. J. Ward. "Thixoforming of Hypereutectic Al/Si Automotive Pistons". Solid State Phenomena 141-143 (julio de 2008): 201–6. http://dx.doi.org/10.4028/www.scientific.net/ssp.141-143.201.

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For hypereutectic Al/Si alloys, one of the advantages of thixoforming in comparison with casting routes is the relatively short processing times at high temperatures and hence limited coarsening of the Si phase. Coarse silicon particles give poor mechanical properties. Here two hypereutectic Al/Si alloys (magneto-hydro-dynamically (MHD) stirred A390 from Pechiney and an extruded A390 alloy from Showa in Japan) have been thixoformed to form pistons. Opening up the die entrance to the full width of the crown made the flow into the die more uniform and helped to reduce the tendency for large pores to form due to swirling of the slurry. Die heating reduced cold shuts in the skirt (thin section) of the piston. Placing inserts into the die to make holes for the piston pins (i.e. having an obstacle in the thicker regions) evened up the flow between the thick and the thin regions in the die. Massive pores experienced in earlier shots were then eliminated. Placing ceramic material in the die entrance considerably reduced the shrinkage porosity in the crown. The use of the Showa alloy, where the globular semisolid microstructure is achieved by a solid state deformation route rather than MHD, gave reduced shrinkage porosity and eliminated macrosegregation of the eutectic and the silicon. Computer modeling has aided optimization of the die.

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Hallmann, Damian, Piotr Jankowski, Janusz Mindykowski, Kazimierz Jakubiuk, Mikołaj Nowak y Mirosław Woloszyn. "Modeling of Electrodynamic Phenomena in an Ultra-Rapid Inductive–Dynamic Actuator as Applied to Hybrid Short-Circuit Breakers—A Review Study". Energies 15, n.º 24 (12 de diciembre de 2022): 9394. http://dx.doi.org/10.3390/en15249394.

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This article is a study of the research development of electrodynamic phenomena occurring in ultra-fast electrodynamic drives. These types of linear drives are among the fastest, not only because of the huge accelerations achieved, but, above all, because of the extremely short reaction time. For this reason, electrodynamic drives are used in hybrid short-circuit breakers. The phenomena occurring in this type of drive are actually magneto-thermo-elastic in nature, but the coupling of these phenomena should be considered weak if the criteria for repeatable operation in a hybrid circuit breaker system are met. The authors have been researching this type of drive for many years through not only experimental studies, but also primarily simulation studies developing models of such drives. The authors present the history of the development starting from the first works of Thomson, and Kesserling and ending with the most current models, including mainly their own. This article presents mainly works studying electrodynamic phenomena. Thermal and mechanical phenomena were comprehensively presented by the authors in previous papers.

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Jamolov, Umid y Giovanni Maizza. "Integral Methodology for the Multiphysics Design of an Automotive Eddy Current Damper". Energies 15, n.º 3 (4 de febrero de 2022): 1147. http://dx.doi.org/10.3390/en15031147.

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The present work reports an integrated (experimental and numerical) methodology that combines the development of a finite element multiphysics model with an experimental strategy to optimally design an eddy current damper for automotive suspensions. The multiphysics model couples the whole set of time-dependent electromagnetic, thermal, mechanical, and fluid–wall interaction (CFD) partial differential equations. The developed FE model was validated against both literature model predictions and in-house experimental data. The electromagnetic model takes into account the magnetic material characteristics of the ferromagnetic material and iron poles. Loss separation and the Jiles–Atherton hysteresis models were invoked to determine the heat generated in the soft iron parts. The computation of the fluid–wall interaction phenomena in the air gap allowed for the prediction of the temperature field across the solid materials, including the magnets. The design of the EC damper addresses the effects of the geometries of the stator and rotor, as they are the most critical geometries for maximizing the functions of an eddy current damper. The magneto-thermal simulations suggested that the heating of the permanent magnets remains within a safe region over the investigated operational frequency range of the eddy current damper.

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Xiao, Ling, Shandong Zheng, Jingwei Dou y Wenjie Cheng. "Analysis of the Magneto-Thermal Bidirectional Coupling Strength of Macro and Micro Integration for Self-Starting Permanent Magnet Hysteresis Synchronous Motors". Machines 11, n.º 10 (28 de septiembre de 2023): 931. http://dx.doi.org/10.3390/machines11100931.

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High-speed permanent magnet synchronous motors (PMSMs) are usually started with the hybrid low-speed open-loop and high-speed closed-loop control mode. However, low-speed open-loop control produces large starting current, or even current overload, resulting in demagnetization and motor damage. Therefore, there is an urgent need to develop a high-speed permanent magnet synchronous motor with self-starting ability at low speed, that is, a permanent magnet hysteresis motor (PMHM). This paper takes the permanent magnet ring hysteresis column rotor structure as the research object. Firstly, the performance of this type of rotor is improved using the micro level of effective layer material AlNiCo, and the mechanical properties of AlNiCo are calculated. Secondly, based on the thick-walled cylinder theory, the analytical model for calculating the strength of the composite rotor considering the temperature effect is deduced, and the tangential and radial stress distribution for each part of the rotor under no-load and load conditions are obtained. Then, the electromagnetic losses and temperature field distribution of the rotor are obtained using the magneto-thermal bidirectional coupling finite element method. Finally, strength of the thermal rotor is analyzed by substituting the temperature rise curve function and AlNiCo parameters at the operating temperature. The comparison of the stress calculation results of the semi-analytical solution and the finite element method showed that the error between both of them is less than 5%, which verified that the semi-analytical solution can accurately analyze the thermal stress distribution of the rotor during high-speed rotation.

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Raimondi, Lorenzo, Michele Manfredda, Nicola Mahne, Daniele Cocco, Flavio Capotondi, Emanuele Pedersoli, Maya Kiskinova y Marco Zangrando. "Kirkpatrick–Baez active optics system at FERMI: system performance analysis". Journal of Synchrotron Radiation 26, n.º 5 (12 de agosto de 2019): 1462–72. http://dx.doi.org/10.1107/s1600577519007938.

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FERMI is the first and only seeded EUV-SXR free-electron laser (FEL) facility available to users; it operates at Elettra – Sincrotrone Trieste (Italy) and it presents five operating endstations. Three of them, namely LDM (Low Density Matter), DiProI (Diffraction and Projection Imaging) and MagneDyn (Magneto-Dynamical studies), use a Kirkpatrick–Baez (KB) active X-ray optics system to focus the FEL pulses into the experimental chambers. The present work reports on the final results of the upgraded KB Active Optics Systems (KAOS), which have been mechanically modified in order to improve stability and repeatability with respect to the original design. The results have been obtained on both the FERMI FEL lines, FEL1 and FEL2, and are particularly relevant for the latter as it is the low-wavelength line recently opened to users. After a thorough description of the new mechanical layout of the system and the aspects that have been improved after the refurbishment, a set of simulations of the optical performances are presented. The code used to simulate the behavior of KAOS is WISEr, a physical-optics-based tool, which is freely accessible, and integrated into the Oasys platform, that takes into account the specific surface metrology characterization of the beamline mirrors, including figure errors and microroughness power spectral density. The results of WISEr are then used as a reference for the actual optimization of the optical system. This procedure relies heavily on a wavefront sensor (WFS) mounted out of focus to optimize the refocusing mirrors alignment as well as their curvature bending (by minimization of the coefficients of the Zernike wavefront expansion). Moreover, the WFS data are used to reconstruct the focal spot parameters by means of a back-propagation of the electric field. Finally, these results are compared with those obtained after the FEL ablation of a PMMA layer positioned on the focal plane, and analyzed ex situ in a post-mortem fashion. The mechanically refurbished optical system and the multi-technique alignment approach, aimed at optimizing the mirrors' curvature, pitch and roll angles, allowed a focal spot of 1.8 µm × 2.4 µm at 4.14 nm wavelength (FEL2) to be inferred, confirmed by the PMMA ablation imprints.

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Zhi Shen, Wang, Wang Hong Bo, Guo Tiantian y Liu Xu Hui. "Parameter optimization of a metal foam magneto-rheological damper". International Journal of Mechanics and Materials in Design 16, n.º 2 (25 de mayo de 2019): 323–30. http://dx.doi.org/10.1007/s10999-019-09463-z.

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38

Sampath, Rajiv y Nicholas Zabaras. "A functional optimization approach to an inverse magneto-convection problem". Computer Methods in Applied Mechanics and Engineering 190, n.º 15-17 (enero de 2001): 2063–97. http://dx.doi.org/10.1016/s0045-7825(00)00222-x.

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39

Yu, Jianqiang, Xiaomin Dong, Shuaishuai Sun y Weihua Li. "Comparison of dynamic models based on backbone curve for rotary magneto-rheological damper". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, n.º 14 (11 de junio de 2019): 2732–40. http://dx.doi.org/10.1177/0954406219856392.

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To realize the accurate control of magneto-rheological system, the nonlinear dynamic model as the joint of damper and control strategy is worthy of being investigated. In this study, the modeling methods based on the backbone curve are proposed to portray the dynamic characteristics of magneto-rheological damper. The modeling methods contain the phase lag method and the hysteresis division method. Six novel algebraic models are deduced from the two methods and compared systematically. The parameters identification of models is conducted by the nonlinear least square method. The nonlinear least square optimization problem is solved by the Levenberg–Marquardt algorithm. The evaluation indexes including the root-mean-square error, mean deviation and computation time are calculated to evaluate the accuracy and feasibility of the novel models. Results show that the modeling methods and their models can describe the nonlinear hysteretic characteristics with feasibility and accuracy.

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Colaço, Marcelo J. y George S. Dulikravich. "Solidification of Double-Diffusive Flows Using Thermo-Magneto-Hydrodynamics and Optimization". Materials and Manufacturing Processes 22, n.º 5 (4 de junio de 2007): 594–606. http://dx.doi.org/10.1080/10426910701322583.

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41

Mohebbi, Mohtasham, Hamed Dadkhah y Hamed Rasouli Dabbagh. "A genetic algorithm–based design approach for smart base isolation systems". Journal of Intelligent Material Systems and Structures 29, n.º 7 (9 de octubre de 2017): 1315–32. http://dx.doi.org/10.1177/1045389x17733058.

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This article presents a new approach for designing effective smart base isolation systems composed of a low-damping linear base isolation and a semi-active magneto-rheological damper. The method is based on transforming the design procedure of the hybrid base isolation system into a constrained optimization problem. The magneto-rheological damper command voltages have been determined using H2/linear quadratic Gaussian and clipped-optimal control algorithms. Through a sensitivity analysis to identify the effective design parameters, base isolation and control algorithm parameters have been taken as design variables and optimally determined using genetic algorithm. To restrict increases in floor accelerations, the objective function of the optimization problem has been defined as minimizing the maximum base drift while putting specific constraint on the acceleration response. For illustration, the proposed method has been applied to design a semi-active hybrid isolation system for a four-story shear building under earthquake excitation. The results of numerical simulations show the effectiveness, simplicity, and capability of the proposed method. Furthermore, it has been shown that using the proposed method, the acceleration of the isolated structure can also be incorporated into design process and practically controlled with a slight sacrifice of control effectiveness in reducing the base drift.

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Kumari, Chinu, Sanjay Kumar Chak y Vamula Vijay Vani. "Experimental investigations and optimization of machining parameters for Magneto-rheological Abrasive Honing process". Materials and Manufacturing Processes 35, n.º 14 (22 de junio de 2020): 1622–30. http://dx.doi.org/10.1080/10426914.2020.1779938.

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43

Truong, Binh Duc, Shane Williams y Shad Roundy. "Experimentally validated model and analytical investigations on power optimization for piezoelectric-based wireless power transfer systems". Journal of Intelligent Material Systems and Structures 30, n.º 16 (23 de julio de 2019): 2464–77. http://dx.doi.org/10.1177/1045389x19862383.

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This article presents a near-field low-frequency wireless power transfer system utilizing a piezoelectric transducer with magnet tip mass as a receiver. The interaction moment between the uniform B field generated by a Helmholtz coil and the magnet is the means to deliver the electrical energy from the transmitter to an electrical load, which is therefore referred to as magneto-mechano-electric effect. This is the first time a complete equivalent circuit model of such a structure is developed and experimentally verified. Based on the lumped model, various aspects of the power optimization problem are thoroughly discussed, providing a comprehensive view of the system and an important premise for further study.

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Klank, M., O. Hagedorn, C. Holthaus, M. Shamonin y H. Dötsch. "Characterization and optimization of magnetic garnet films for magneto-optical visualization of magnetic field distributions". NDT & E International 36, n.º 6 (septiembre de 2003): 375–81. http://dx.doi.org/10.1016/s0963-8695(03)00012-4.

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45

Hartl, Darren J., Geoffrey J. Frank y Jeffery W. Baur. "Embedded magnetohydrodynamic liquid metal thermal transport: validated analysis and design optimization". Journal of Intelligent Material Systems and Structures 28, n.º 7 (28 de julio de 2016): 862–77. http://dx.doi.org/10.1177/1045389x16657429.

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This work addresses the multi-fidelity analysis-driven design of a thermal transport system based on the flow of liquid metal through a structural laminate as induced by a solid-state magneto-hydro-dynamic (MHD) pump. A full three-dimensional model of the thermal transport system is both simplified to a reduced-order algebraic model, which correctly captures trends in the global system response, and alternatively implemented in an finite element framework, which captures essential global and local aspects of the system response not attainable via reduced-order modeling. The predictions of each model are validated against previously published experimental data. It is shown in detail for the first time in the context of MHD systems that a multi-fidelity approach to the multi-objective design optimization problem can leverage both the speed of the algebraic model and the accuracy of the finite element model, leading to effective predictions of optimal system designs in a reasonable amount of time. A relatively new algorithm for multi-objective and parameterized Pareto optimization is employed, and a clear path of continued development is identified.

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Quang, Vu Dinh, Tran Quoc Quan y Phuong Tran. "Static buckling analysis and geometrical optimization of magneto-electro-elastic sandwich plate with auxetic honeycomb core". Thin-Walled Structures 173 (abril de 2022): 108935. http://dx.doi.org/10.1016/j.tws.2022.108935.

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47

Zeng, Zhiwei, Lalita Udpa, Satish S. Udpa, Liang Xuan y William Shih. "Optimization of Test Parameters for Magneto-Optic Imaging Using Taguchi's Parameter Design and Response-Model Approach". Research in Nondestructive Evaluation 19, n.º 3 (4 de agosto de 2008): 164–80. http://dx.doi.org/10.1080/09349840802043471.

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48

Wu, Yiheng, Guiqing Feng, Yuxia Li, Rui Zhang, Nan Zhang, Shuaihua Wang y Shaofan Wu. "Fabrication and performance optimization of novel (Tb0.9975R0.0025)3Sc2Al3O12 (R= Pr, Ho, Dy, Eu) magneto-optical transparent ceramics". Journal of Alloys and Compounds 950 (julio de 2023): 169929. http://dx.doi.org/10.1016/j.jallcom.2023.169929.

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49

Vahedi, S. M., A. Zare Ghadi y M. S. Valipour. "Application of Response Surface Methodology in the Optimization of Magneto-Hydrodynamic Flow Around and Through a Porous Circular Cylinder". Journal of Mechanics 34, n.º 5 (8 de febrero de 2018): 695–710. http://dx.doi.org/10.1017/jmech.2018.1.

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AbstractIn this study MHD flow around and through porous cylinder is numerically investigated. The governing equations are developed in polar coordinate arrangement in both porous and non-porous media on the basis of single-domain technique. The equations are solved numerically based on finite volume method over staggered grid structure. Nusselt number and drag coefficient are selected as two key parameters describing performance of this system. By applying response surface methodology the sensitivity of these parameters to main factors of the problem, including Stuart number, Darcy number and Reynolds number are quantified. RSM is also utilized to perform an optimization process to find the best condition in which the lowest drag force and highest heat transfer rate occur simultaneously. The CFD analysis is carried out for variant Reynolds numbers (10 ≤ Re ≤ 40), Darcy numbers (10-6 ≤ Da ≤ 10-2) and Stuart numbers (2 ≤ N ≤ 10). Streamlines and isotherms are presented to indicate the impacts of such parameters on heat and fluid flow. It can be seen that, Drag coefficient and Nusselt number increase by augmenting magnetic field strength. Beside, Darcy number and Reynolds numbers have a direct and inverse effect on Nuave and Cd, respectively. Results of optimization process show that Nuave and Cd are more sensitive to Reynolds and Stuart numbers, respectively, while they less sensitive to Darcy number. Moreover, it is revealed that the optimum condition occurs at Da = 10-2, Re = 38.1 and N = 4.49.

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Yi-ze, Chen y Chen Qing-tang. "State prediction of MR system by VMD-GRNN based on fractal dimension". Advances in Mechanical Engineering 14, n.º 12 (diciembre de 2022): 168781322211458. http://dx.doi.org/10.1177/16878132221145899.

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Taking the test signals of magneto-rheological vibration system under different states as research objects, four Generalized Regression Neural Network (GRNN) prediction algorithms, based on time series, time series Auto-Regressive (AR) model coefficients, time series box dimensions, and Variational Modal Decomposition (VMD) box dimensions, are designed. Moreover, four Back Propagation Neural Network (BPNN)comparative prediction algorithms, based on the four previous parameters, are also designed. These eight algorithms are applied to predict vibration damping efficiency of the system. The prediction results show that, compared to the BPNN prediction algorithm, the corresponding four GRNN prediction algorithms have the advantages of strong self-learning ability, fast convergence speed, high prediction accuracy, and stable prediction results. Among the eight prediction algorithms, the GRNN prediction algorithm, based on VMD box dimension, forecasts the results with good stability, better self-learning ability, and higher computing speed, which can maximize the prediction accuracy of the system, the minimum prediction error can reach 1.9049% when the parameters K = 4, N = 33, and Spread = 0.601. To sum up, through parameter optimization, the optimal parameter combination scheme of GRNN prediction algorithm, based on VMD box dimension, is obtained, and the best prediction effect is achieved.

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