Modeling of Rotating Magnetic Field Eddy Current Probe for Inspection of Tubular Metallic Components
T. V. Shyam, B. S. V. G. Sharma, K. Madhusoodanan
Bhabha Atomic Research Centre, Mumbai, Maharashtra, India
Rotating Magnetic Field Eddy current technique is a promising technique for inspection of flaws in metallic tubular components. Three primary coils, 120 degrees apart in space, are excited with three phase current source, by virtue, a rotating magnetic field polarised in radial direction is generated. This radial field interacts with metallic tube and generates ...
P. R. Underhill , T. W. Krause ,
 Department of Physics, Royal Military College of Canada, Kingston, ON, Canada
COMSOL Multiphysics® software is used to understand the difference in behaviour of two Magnetic Barkhausen Noise (MBN) probes. The dipole probe has to be physically rotated to sample the angular distribution of the MBN. The tetrapole probe uses vector superposition to rotate the magnetic field without probe motion. Using the AC/DC Module and non-isotropic material properties, it was found that, ...
Arshad , Dr. A. Nekahi , S. McMeekin , M. Farzaneh 
 School of Engineering and Built Environment, Glasgow Caledonian University, United Kingdom
 Canada Research Chair on Atmospheric Icing Engineering of Power Networks (INGIVRE), Université du Québec à Chicoutimi, QC, Canada
Electric field distribution along an insulator surface is of prime importance for the long term performance of insulators. In this paper electric field and potential distribution along a standard 33 kV polymeric insulator were investigated under different pollution conditions. Effect of voltage type and polarity on the electric field and potential distribution under contaminated conditions were ...
B. Valentini ,
 Plansee SE, Reutte, Austria
Resistive heating filaments used in high temperature applications at 2000°C and above are often made of refractory metals. The lifetime of such filaments is mainly limited by creep deformations which can in the worst case lead to a short circuit between filaments and other furnace components. With the aid of COMSOL Multiphysics software, the time-dependent creep deformation behavior of a heater ...
蒋帆 , 孙衢骎 ,
目前，脉冲磁体广泛采用导体绕组和加固材料分层交替绕制的工艺（内部层间加固），以提高磁体的整体结构强度。磁体在长期的放电工作过程中，反复经历强电磁力的作用，导体材料（一般为纯铜、铜基合金以及铜基复合材料）在重复的加卸载过程中存在着塑性应变的累积效应，即棘轮效应。导体材料塑性应变的逐渐累积，导致了磁体不可逆电感值的不断增加。因此，磁体的不可逆电感变化可表征磁体内部的整体变形情况，可用于脉冲磁体的疲劳失效预测。 本文基于 COMSOL Multiphysics® 5.1 软件，对脉冲磁体的放电过程建立了电路、电磁场、温度场及结构场的二维轴对称全耦合模型。考虑了放电过程中集肤效应对磁体电阻、电感的影响；在结构场中引入了接触对，采用罚函数法对磁体内部的层间分离机制进行了有效的模拟；利用耦合变量，基于 ALE 方法计算了脉冲磁体在服役过程中 ...
Numerical Study of the Electrical Properties of Insulating Thin Films Deposited on a Conductive Substrate
R.A.Gerhardt, and S. Kumar
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
Parametric finite element simulations were performed to study the effect of film thickness, and electrode size on the different impedance parameters for insulating thin films deposited on a conductive substrate. COMSOL Multiphysics® was used to solve the quasi-static form of Maxwell’s electromagnetic equations in time harmonic mode. Several types of 2D models (linear and axisymmetric) ...
陆晓 , 温周斌 ,
使用 COMSOL Multiphysics® 仿真轴对称扬声器一般可采用 2D 轴对称模型，但在这种坐标系下无法建立扬声器测量中常用的矩形障板模型，而选择计算安装在无限大障板上扬声器的声特性，其仿真计算结果又与常见的标准障板上的测量结果在中低频段存在较大差异。 为了使无限大障板上的仿真结果与标准障板（或其它有限大障板）上的测量结果相一致，提出一种方法，利用 COMSOL 软件的 Parameter Sweep 功能，通过多次进行 2D 轴对称的电磁场、结构力学和声学三场耦合的扬声器仿真计算及相应后处理，得到安装在有限大障板上的扬声器正前方的声特性。 采用该方法可在较短时间内比较准确地计算得到安装在任意形状的有限大障板上的扬声器的声压级和谐波失真等特性。如图1和图2所示，采用该方法得到的声压级和总谐波失真曲线（红色），与测量结果（黑色）趋势和细节都比较一致。 ...
F. Bosi , M. Magarotto , P. de Carlo , M. Manente , F. Trezzolani , D. Pavarin , D. Melazzi , P. Alotto , R. Bertani ,
 Department of Industrial Engineering, University of Padova, Padova, Italy
 CISAS "G.Colombo", University of Padova, Padova, Italy
Microwave discharges have a wide range of applications, such as gas conversion, material processing and surface treatment; also they can provide an efficient way for dissociation of molecular gases as CO2 and N2O. Depending on the operating pressure and temperature, non-equilibrium conditions can be attained within the discharge, where electron temperature, vibrational temperature and ...
S. Kirigeeganage , J. Naber , D. Jackson , R. Keynton , T. Roussel ,
 University of Louisville, Louisville, KY, USA
This paper utilizes COMSOL Multiphysics® software and the Application Builder to simulate neurological responses in nerve axons due to external electrical stimuli. The AC/DC Module of the COMSOL® software is first used to solve the Maxwell's equations. Then the results from the Maxwell's equations are used to drive a second model constructed using global equations using the Global ODE and DAE ...
Smiths Detection (Watford) Ltd, Watford, UK
This paper presents results on the visualisation of tracks of charged particles in a non-uniform magnetic field. The field modelled is that generated by a coil driven by DC current. The motion of typical particles, such as electrons, ions and multiply-charged heavy particles has been simulated. The motion is initially assumed to be in vacuum, so that collisions with neutral particles can ...