Finite Element Modeling for Inspection of CANDU® Steam Generators - new
S. G. Mokros[1], P. R. Underhill[2], J. Morelli[1], T. W. Krause[2]
[1]Department of Physics, Engineering Physics & Astronomy, Queen's University, Kingston, ON, Canada
[2]Department of Physics, Royal Military College of Canada, Kingston, ON, Canada
Steam generators (SGs) are used in CANDU® nuclear reactors as heat exchangers to convert water into steam using heat generated in the reactor core. Ferrous trefoil broach support structures prevent excessive vibration of thousands of SG tubes. A probe that uses pulsed eddy current (PEC) technology has been designed for inspection of support structures, from within SG tubes, to detect and ...
安装在有限大障板上的轴对称扬声器特性的近似计算方法
陆晓 [1], 温周斌 [1],
[1] 浙江中科电声研发中心，嘉善，浙江，中国
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。 ...
Investigating Magnetic and Electric Fields Couplings for 3D Models in Harmonic and Transient States
O. Maloberti [1], O. Mansour [1]
[1] ESIEE Amiens, Amiens, France
At present, no 3D transient magnetic and electric fields formulation with strong eddy currents and high electric fields is available in the physical applications with COMSOL Multiphysics® software. However, some industrial products need such a tool, as it is the case for induction coils of pulsed magnetic technologies. The principle is to induce a force thanks to strong eddy currents induced by ...
Quasielectrostatic Induction on Stationary Vehicles under High Voltage Power Lines
J. Leman[1]
[1]POWER Engineers, Hailey, ID, USA
The National Electrical Safety Code (NESC) requires that high voltage power lines in the U.S. be designed to limit electrostatic effects on nearby equipment. An example is that of a large vehicle underneath a transmission line. The tires insulate the vehicle’s body from ground. If a person standing on the ground makes contact with the vehicle surface, 60 Hz current can pass through the ...
Study of Resonant Coupling using various Magnetic and Negative Refractive Index Materials
G. Boopalan[1], C. K. Subramaniam[1]
[1]School of Electronics Engineering, VIT University, Vellore, Tamil Nadu, India
Non contact charging of electronic equipment from mobiles to electric vehicle has created immense interest among researchers. There are various groups working on both radiative and non-radiative energy transfer. The idea based on strongly coupled magnetic resonances is of interest because of the increased distance of energy transfer. This technology based on resonant magnetic coupling with the ...
Electrochemical Study of Potential Materials for Cochlear Implant Electrode Array
N. Lawand[1], V. Lopez[1,2], P. French[1]
[1]Delft University of Technology, Delft, The Netherlands
[2]Università degli studi di Napoli "Federico II", Naples, Italy
Cochlear Implants (CIs) are implantable prostheses that bypass the non-functional inner ear and directly stimulate the auditory nerve with electric currents, enabling deaf people to experience sound again. The CI electrode array sits inside the cochlea close to the auditory neurons. An ideal stimulation material must have low impedance with maximum charge transfer capacity in the electrochemical ...
Shielding Cylinder Effect in High-Speed Electric Machines
B. Hannon[1], P. Sergeant[1]
[1]Ghent University, Ghent, Belgium
In the field of electric machines, a trend towards both higher efficiency and higher power density is observed. This has led to a growing importance of Permanent Magnet Synchronous Machines. However, the magnets used in these machines risk demagnetization at high temperatures. Especially in machines operated at high speeds. A commonly proposed solution is the shielding cylinder (SC), a ...
Finite Element Analysis of Defibrillation Current Density in Pregnant Women
A. Jeremic[1], E. Khosrowshahli[1]
[1]McMaster University, Hamilton, ON, Canada
Although resuscitation during pregnancy is relatively uncommon and rarely causes death, they have a particularly large impact in terms of the mortality of the unborn child and long-term effects on families and society as whole. In this paper, we present a new 3D finite element model of a pregnant female torso which accounts for presence of amniotic liquid and calculate current density ...
Magnetic Devices For a Beam Energy Recovery THz Free Electron Laser - new
R. R. S. Caetano[1], G. Cernicchiaro[2], R. M. O. Galvão[3]
[1]Universidade Federal do Rio de Janeiro, Macaé, RJ, Brazil
[2]Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro, RJ, Brazil
[3]Instituto de Física USP, São Paulo, SP, Brazil
This paper presents a numerical analysis of magnetic devices, dipole, quadrupole and undulator and a THz Free Electron Laser (FEL) electron-beam recovery system. Free Electron Laser are an important source of coherent radiation being used in the study of chemical properties of substances, thus being an important tool for various fields of science such as condensed matter physics, chemistry, ...
COMSOL在斜井和水平井阵列感应响应计算中的应用
仵杰 [1], 史盼盼 [1],
[1] 西安石油大学，西安，陕西，中国
斜井和水平井中阵列感应响应特性研究是测井数据正确解释的基础。在斜井和水平井中，井轨迹可能以任意角度进出水平地层，阵列感应测井响应计算是复杂的三维电磁场数值计算。基于 COMSOL Multiphysics® 软件的 AD/DC 模块开发完成斜井和水平井中的阵列感应响应三维数值计算方法。详细计算分析水平井和斜井中井位置、目的层厚、目的层电导率、围岩电导率以及目的层与围岩电导率对比度对阵列感应测井响应的影响。结果表明，水平井的阵列感应测井响应特性取决于层厚、电导率对比度、子阵列间距、仪器距层界面距离等多种因素。当层厚大于仪器分层厚度时，水平井响应与直井响应接近；当层厚小于仪器分层厚度时，水平井响应与直井明显不同，在仪器进出界面时，响应出现明显尖峰；给定层厚，与直井比较，短阵列差别小，长阵列差别大。斜井中，当倾角小于30º时，响应受倾角影响小。当倾角从 30º 到 80º 变化时 ...
