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Rotor blades for wind turbines are made of GFRP material. They have to be designed to withstand wind and weather over their approximately 20 years of lifetime. The ability to monitor the mechanical stress is crucial in order to reduce maintenance costs and to maximize operational ... Mehr lesen
电阻抗成像（EIT）技术由于分辨率较低受到专家学者的诟病，而EIT与超声技术两者的结合以及 EIT 与磁共振技术两者的结合可以提高成像的分辨率，但仍分别存在电极射频屏蔽效应以及分辨率难以进一步提高等问题。本文将磁共振成像技术和磁声电技术优势互补，采用低频振动进行激励，提出了一种新的动电成像方法，并采用 COMSOL 软件建立了二维仿真模型，使用 PDE 模式对动电阻抗成像的正问题进行了仿真研究，利用 COMSOL 的仿真结果结合Matlab软件进行了反演，实验结果可以反映出仿真模型内部的电导率分布，能够解决上述电阻抗成像结合技术存在的问题。 Mehr lesen
Flows of electrically conducting liquids in external magnetic fields are present in several applications. In this kind of flow, the inhomogeneous magnetic field creates a breaking force on the conducting fluid. As a result, a stagnant zone is formed in the zone affected by the localized ... Mehr lesen
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) ... Mehr lesen
The silicon cantilever with the planar coil was applied to the magnetic flux density measurements. The influence of shape and dimensions of planar coil on magnetic energy density was described. In cause of magnetic anisotropy of analyzed silicon structure FEM method and couple field ... Mehr lesen
INTRODUCTION: Micro Electro Mechanical Systems (MEMS) are fabricated with an in-plane fabrication technology. Out-of-plane structures can be designed to be assembled to provide thermal and electrical isolation from the substrate [1 -3]. These isolations can potentially improve the ... Mehr lesen
Introduction: Vibration energy harvester can convert mechanical vibration energy into electrical energy and store it in battery for later use. It can create clean renewable energy from vibration movements such as walking, jumping, running, etc. This can convert energy previously wasted ... Mehr lesen
In this paper we present a summary of our work on numerical modeling of superconductors with COMSOL Multiphysics®. We discuss the two models we utilized for this purpose: a 2-D model based on solving Maxwell equations and a 1-D model for thin conductors based on solving the integral ... Mehr lesen
Multilayer planar transformers are widely implemented in power electronic applications. The design process of these elements is complicated due to the complexity of a magnetic circuit and high frequency interactions between windings. Additionally, an analytical approach to the analysis ... Mehr lesen
The vibration of an electrodynamic loudspeaker driver causes a resulting sound pressure. For simple pistonic vibration, there is a simple relationship between the vibration and the sound pressure. For complex vibration patterns, however, different parts of the vibrating surface ... Mehr lesen