The Experts below are selected from a list of 285 Experts worldwide ranked by ideXlab platform

T. Uchimoto - One of the best experts on this subject based on the ideXlab platform.

  • Crack shape reconstruction in Ferromagnetic Materials using a novel fast numerical simulation method
    IEEE Transactions on Magnetics, 2004
    Co-Authors: Haoyu Huang, T. Takagi, T. Uchimoto
    Abstract:

    This paper describes research on crack shape reconstruction in Ferromagnetic Materials using a novel fast numerical simulation method. The fast numerical method developed here, which can treat Ferromagnetic Materials, is an extension of a precomputed database approach based on the reduced magnetic vector potential method. It provides a fast forward simulator that is about 80 times faster than a conventional one, even in the case of Ferromagnetic Materials, without losing accuracy. The fast simulator is applied to the inverse problem of eddy current testing (ECT), crack shape reconstruction, and results of some electric discharge machining (EDM) cracks on a Ferromagnetic plate are shown.

  • fast numerical calculation for crack modeling in eddy current testing of Ferromagnetic Materials
    Journal of Applied Physics, 2003
    Co-Authors: Haoyu Huang, T. Takagi, T. Uchimoto
    Abstract:

    Eddy current testing (ECT) is a nondestructive testing method for metal Materials. Numerical methods are applied to predict the ECT signals, to aid in the design of ECT probes, and to reconstruct crack shapes from their ECT signals. For the testing of nonFerromagnetic Materials, the high accuracy of some numerical simulation techniques has been demonstrated and several fast computational methods have been presented. However, the numerical calculation of electromagnetic fields in Ferromagnetic Materials remains a difficult and time-consuming task. Representing cracks in Ferromagnetic Materials with secondary electric and magnetic sources leads to a fast method for predicting ECT signals as presented in this article. The method developed here, that can be used to treat Ferromagnetics, is an extension of the precomputed database approach based on the magnetic vector potential method. With the aid of precomputed databases, ECT signals of different cracks can be computed from changes in the secondary sources i...

Xiaojing Zheng - One of the best experts on this subject based on the ideXlab platform.

  • an anisotropic magneto mechanical model of Ferromagnetic Materials for the magnetic memory testing method
    Journal of Applied Physics, 2019
    Co-Authors: Pengcheng Zhang, Xiaojing Zheng
    Abstract:

    The metal magnetic memory (MMM) method shows great potential in the early damage evaluation of Ferromagnetic Materials. The MMM signal is affected by the environmental magnetic field because of the magneto-mechanical coupling effect. For instance, the effect of the environmental magnetic field is connected with the angle between the environmental magnetic field and the detected structure, which is referred to as the angle effect. This paper aims to explore the angle effect on the MMM method under the weak magnetic field. An anisotropic nonlinear magneto-mechanical constitutive relationship is proposed based on the magnetic domain theory and the approach law. Compared to the existing model, the present constitutive relationship in this paper can predict the stress-magnetization curve of Ferromagnetic Materials under the combined action of the loading stress and the environmental magnetic field with different directions. Based on the present constitutive relationship, an anisotropic nonlinear magneto-mechanical model of the MMM method is established, and then the angle effect is discussed in detail. The prediction of the anisotropic nonlinear magneto-mechanical model shows a good agreement with experimental data. The proposed model can clarify the reasons for some complex phenomena of the MMM signal, and thus help in the practical application of the MMM method.The metal magnetic memory (MMM) method shows great potential in the early damage evaluation of Ferromagnetic Materials. The MMM signal is affected by the environmental magnetic field because of the magneto-mechanical coupling effect. For instance, the effect of the environmental magnetic field is connected with the angle between the environmental magnetic field and the detected structure, which is referred to as the angle effect. This paper aims to explore the angle effect on the MMM method under the weak magnetic field. An anisotropic nonlinear magneto-mechanical constitutive relationship is proposed based on the magnetic domain theory and the approach law. Compared to the existing model, the present constitutive relationship in this paper can predict the stress-magnetization curve of Ferromagnetic Materials under the combined action of the loading stress and the environmental magnetic field with different directions. Based on the present constitutive relationship, an anisotropic nonlinear magneto-mechan...

  • Quantitative Inversion of Stress and Crack in Ferromagnetic Materials Based on Metal Magnetic Memory Method
    IEEE Transactions on Magnetics, 2018
    Co-Authors: Pengcheng Zhang, Zhenmao Chen, Xiaojing Zheng
    Abstract:

    Ferromagnetic Materials are widely used in engineering structures. Damages caused during manufacture and the use of Ferromagnetic Materials may seriously undermine the safety of the engineering structure, and even lead to serious industrial accidents. For the early damage testing problem of Ferromagnetic Materials, it is imperative to propose and adopt new nondestructive testing methods. The metal magnetic memory (MMM) method, which is also known as the micromagnetic testing method, can achieve the early detection of damages in Ferromagnetic Materials such as steels. However, due to the lack of the quantitative research, the MMM method is only applicable for damage localization. In this paper, the MMM method is utilized to quantitatively evaluate the stress and crack in Ferromagnetic Materials. The inverse model including the objective function and optimization parameters is proposed. The reconstruction approach is established based on the conjugate gradient inversion method and the exact line search algorithm. In the theoretical analysis, the effectiveness of the MMM method in quantitative determination regarding the position and size of defects is verified with the experimental signal of a hole defect. Following this, the theoretical analyses of localization and sizing of stress and crack are conducted by using the simulation results as the measured signals. It can be found from the results that the MMM method can be applicable for quantitative evaluation of surface rectangular cracks, surface stress concentration zone, convex-type defect, and so on. In addition, the influences of the signal selection, sampling rate, lift-off value, stress level, and noise amplitude on the quantitative analysis of early stress concentration are discussed in details.

Haoyu Huang - One of the best experts on this subject based on the ideXlab platform.

  • Crack shape reconstruction in Ferromagnetic Materials using a novel fast numerical simulation method
    IEEE Transactions on Magnetics, 2004
    Co-Authors: Haoyu Huang, T. Takagi, T. Uchimoto
    Abstract:

    This paper describes research on crack shape reconstruction in Ferromagnetic Materials using a novel fast numerical simulation method. The fast numerical method developed here, which can treat Ferromagnetic Materials, is an extension of a precomputed database approach based on the reduced magnetic vector potential method. It provides a fast forward simulator that is about 80 times faster than a conventional one, even in the case of Ferromagnetic Materials, without losing accuracy. The fast simulator is applied to the inverse problem of eddy current testing (ECT), crack shape reconstruction, and results of some electric discharge machining (EDM) cracks on a Ferromagnetic plate are shown.

  • fast numerical calculation for crack modeling in eddy current testing of Ferromagnetic Materials
    Journal of Applied Physics, 2003
    Co-Authors: Haoyu Huang, T. Takagi, T. Uchimoto
    Abstract:

    Eddy current testing (ECT) is a nondestructive testing method for metal Materials. Numerical methods are applied to predict the ECT signals, to aid in the design of ECT probes, and to reconstruct crack shapes from their ECT signals. For the testing of nonFerromagnetic Materials, the high accuracy of some numerical simulation techniques has been demonstrated and several fast computational methods have been presented. However, the numerical calculation of electromagnetic fields in Ferromagnetic Materials remains a difficult and time-consuming task. Representing cracks in Ferromagnetic Materials with secondary electric and magnetic sources leads to a fast method for predicting ECT signals as presented in this article. The method developed here, that can be used to treat Ferromagnetics, is an extension of the precomputed database approach based on the magnetic vector potential method. With the aid of precomputed databases, ECT signals of different cracks can be computed from changes in the secondary sources i...

Vincent Lanfranchi - One of the best experts on this subject based on the ideXlab platform.

  • macroscopic modeling of anisotropic magnetostriction and magnetization in soft Ferromagnetic Materials
    Journal of Magnetism and Magnetic Materials, 2016
    Co-Authors: Serigne Saliou Mbengue, N Buiron, Vincent Lanfranchi
    Abstract:

    Abstract Magnetic and magnetoelastic properties of soft Ferromagnetic Materials, used as laminated sheets, are sensitive to manufacturing processes such as rolling, cutting and coating. One of the effects of these processes is to induce an anisotropic behavior of Materials. Therefore, an anhysteretic magnetostriction and magnetization calculation taking into account the anisotropy effect at macroscopic scale is presented. This model is based on the expression and then the minimization of the total energy in order to determine magnetization and magnetostriction at equilibrium. The total energy to minimize depends on energy terms identified from measurements of the magnetization and magnetostriction at a scale large enough to neglect the heterogeneity due to grains. Therefore, this approach attempts to reproduce Ferromagnetic polycrystal behavior at macroscopic without knowing texture (Orientation Density Function) nor grain properties.

Osama A. Mohammed - One of the best experts on this subject based on the ideXlab platform.

  • Optimal Design of High-Speed Solid-Rotor Cage Induction Motors Considering Ferromagnetic Materials Behavior and Manufacturing Process
    IEEE Transactions on Industry Applications, 2020
    Co-Authors: Haisen Zhao, Hassan H. Eldeeb, Yang Zhan, Guorui Xu, Osama A. Mohammed
    Abstract:

    Numerous high-performance industries (i.e., natural gas compression) require high-speed motors. Solid-rotor cage induction motors (SRCIMs) are perfect nominees to such applications, owing to their high reliability and relatively low cost among their rivals. However, the restrictions over Ferromagnetic Materials and manufacturing processes overwhelm the SRCIM's design process. The motor is required to have low power losses in stator core and the solid rotor. Furthermore, a small number of rotor slots are demanded industrially in order to facilitate the welding process in rotor's side. Those two objectives are contradicting in the design stage. This study investigates the loss characteristics of high-speed SRCIM, considering the behavior of different Ferromagnetic Materials and the complexity of the welding process of solid rotors. With 160-kW and 3000-kW SRCIMs, the influences of slot combination, air-gap length, stator Ferromagnetic material, and rotor conductivity on the power loss characteristics are comprehensively analyzed. Based on the aforementioned analysis, an optimal design criterion for SRCIM is proposed to decline the eddy current losses in the solid rotor and to decrease the complexity of the welding process. To verify this criterion, a 160-kW SRCIM prototype is designed and manufactured. Experimental validation is performed, and the effectiveness of the proposed design procedure is verified.

  • Optimal Design of High-speed Solid Rotor Cage Induction Motors Considering Ferromagnetic Materials Behavior and Manufacturing Process
    2019 IEEE Industry Applications Society Annual Meeting, 2019
    Co-Authors: Haisen Zhao, Hassan H. Eldeeb, Yang Zhan, Guorui Xu, Osama A. Mohammed
    Abstract:

    Several high performance industries (i.e. natural gas compression) require high-speed motors. Solid rotor cage induction motors (SRCIMs) are perfect nominees to such applications, owing to their high reliability. However, the restrictions over Ferromagnetic Materials and manufacturing process overwhelm the SRCIM design. The motor is required to have low power losses in stator core and the solid rotor. Furthermore, low number of rotor slots is demanded in order to facilitate welding process in rotor side. Those two objectives are contradicting in design stage. This study investigates the losses characteristics of high-speed SRCIM considering the behavior of different Ferromagnetic Materials, and the complexity of welding process of solid rotors. With a 160-kW and 3000-kW SRCIMs, the influences of stator Ferromagnetic material, rotor conductivity, slot combination and air-gap length on power loss characteristics are comprehensively analyzed. Based on the aforementioned analysis, an optimal design criterion for SRCIM is proposed to decline the eddy current losses and decrease the complexity of welding process in the SRCIM's rotor. To verify this criterion, a 160-kW SRCIM prototype is designed and manufactured. Experimental validation is performed and the effectiveness of the proposed design procedure is verified.