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干式变压器作为城区供电的重要电力设备，其连续运行时的振动噪声问题已成为制约其发展和应用的瓶颈，铁心的振动噪声不仅会对人们的生活环境造成污染，而且会降低设备的可靠性。由于该问题涉及电磁-机械-声多物理场耦合，铁心振动噪声的准确计算是研究此问题的关键。为此本文基于硅钢片磁特性的测量数据，并考虑铁心磁致伸缩效应，采用 COMSOL Multiphysics 多物理场仿真软件，通过 AC/DC 模块、声-固耦合模块对变压器铁心的应力、声压级分布进行研究，并提出优化控制方法。首先进行场路耦合计算，得到铁心磁场分布及应力分布，最后基于振动位移计算变压器的噪声情况 ... Mehr lesen
Acoustic vibrations are studied for several objects through the application of computational and optical diagnostic techniques. Computational studies are carried out using the eigenfrequency analysis option in the COMSOL structural mechanics application mode, whereas experimental optical ... Mehr lesen
Dedicated work in modeling, simulation and design optimization of Lithium-ion Battery (LIBs) was done in the past decades, and still, the most widely used one for electrochemical processes is the Newman model. [1] The underlying parameters are treated deterministically, but the impact of ... Mehr lesen
Introduction With the vast development in the aerospace industry it is inevitable that currently used materials such as Nickel based super alloys will soon reach its peak performance. Hence developing alternative materials with similar properties that could be enhanced further is ... Mehr lesen
MEMS resonators have been recently adopted in a wide variety of timing, sensing, and actuation applications. The ability to control the dynamics of resonance, namely the resonance frequency and quality factor of these resonators is crucial in achieving high precision performance within ... Mehr lesen
本文利用COMSOL软件仿真了有限宽度的平行黑磷对的等离子体传输及模态分布性质，其中包括它们的光限比和梯度力。首先，设置了两个黑磷层之间的三种不同的相对取向。由于黑磷在光学性质上表现出强烈的各向异性，在三种情况中都发现了对称和反对称模式的存在。对称模式下的电场主要集中在两层黑磷之间，而反对称模式下的电场更多的分散在黑磷对的两侧。结果表明，与反对称模式相比，对称模式表现出更大的光限比和梯度力。更有趣的是，发现zigzag-zigzag结构具有最大的梯度力，而armchair-zigzag结构具有最大的光限比。当两个黑磷层分别沿armchair和zigzag方向时 ... Mehr lesen
This paper describes using thermal structural interaction to model the shrinkage behavior in cement paste under drying. An inverse method of combining the finite element analysis and the least-squares method is implemented to fit experimentally determined shrinkage in order to obtain ... Mehr lesen
This paper describes using thermal-structural interaction to model the shrinkage behavior in cement paste under drying. An inverse method of combining the finite element analysis and the least-squares method is implemented to fit experimentally determined shrinkage in order to obtain ... Mehr lesen
Strain induced by local deformation of a flexible micrometer-sized semiconductor tube is quantified by modeling a ball pressing on the tube wall. By changing the pressing condition, we are able to change the strain state of the tube wall incorporating self-assembled quantum dots (QDs) in ... Mehr lesen
In the framework of the high luminosity large hadron collider (HL-LHC) project, important upgrades will take place by 2024 including the installation of new superconducting magnets in which new beam screens will be placed. The beam screen is an octagonally shaped pipe inserted into the ... Mehr lesen