Articles techniques et présentations

全超导飞轮储能系统利用高温超块体和永磁体之间的磁耦合，表现出优异的自稳定钉扎悬浮性能，在强电应用方面具有广阔的前景。在本文中，我们基于COMSOL Multiphysics，使用H-φ方程结合移动网格建立了全超导飞轮储能系统中推力型和轴颈型轴承的电磁-热-力三维模型。然后，我们提出了不同的Halbach排列方案来增强永磁转子的磁通密度并增强磁耦合。研究了超导轴承的悬浮力、弛豫特性、电磁瞬态分布和温度特性。结果表明，在轴向零场冷却（ZFC）条件下，永磁转子的优化方案可以显着提高推力型轴承的最大悬浮力和悬浮力刚度，分别是4.0倍和2.3倍，轴颈型轴承的最大悬浮力可以提高5 ... En savoir plus

微磁学仿真(micromagnetics simulation)是自旋电子学与磁学领域中重要的一种重要的研究手段，本质上通过求解Landau-Lifshitz-Gilbert（LLG）方程来对磁性体系中磁矩的动力学进行仿真。微磁学仿真的主流软件以开源为主，包括OOMMF、Mumax3等，然而其在工程上的应用以及与多物理场耦合的扩展性仍有所不足。我们基于COMSOL的Physics Builder创立了微磁学仿真模块，不仅能够实现已有的微磁学仿真功能，还能够与COMSOL内置的多物理场进行耦合，如磁弹耦合、磁光耦合、各向异性磁电阻等，为学术研究和工程应用提供了新的接口 ... En savoir plus

A fully-parameterized 3D model of thermoelectric generator (TEG)-based energy harvesters is built. With the use of a coupled CFD and heat transfer FEM simulation, the temperature field within the complete system (heat source, TEG, cooler, ambient air) is computed. Especially the ... En savoir plus

Excessive vent noise poses a prevalent challenge in various acoustic applications, significantly impacting the performance and user satisfaction of audio systems. This research investigates the efficacy of noise reduction using a lumped speaker model implemented in COMSOL Multiphysics. ... En savoir plus

Microwave heating for CO_2 desorption provides fast, low-temperature desorption, lowering energy requirements in carbon capture. According to studies, microwaves generate selective heating, dramatically increasing desorption rates compared to traditional approaches. This new technique ... En savoir plus

The incorporation of two dimensional MXenes with perovskite solar cells have garnered much attention in recent years. MXenes of the form Ti3C2Tx have shown unique electrical capabilities due to its surface terminating functional group, Tx. Additionally, the inclusion of this material to ... En savoir plus

Artificial muscles are materials or devices that mimic the motion of muscles and can change their shape and stiffness in response to external stimuli. We consider pneumatic soft actuators with fiber reinforcements designed to contract upon pressurization and mimic the motion of skeletal ... En savoir plus

This Paper presents the results of a FEM simulation with Comsol Multiphysics for an Axial Flux Permanent Magnet Machine (AFPM) and compares them with analytic calculation methods (Matlab, Siemens Star-CCM Suite) as well as test bench measurements of a manufactured protype. The machine is ... En savoir plus

Microwave hyperthermia (HT) offers a promising approach to cancer treatment by selectively heating tumors to temperatures between 42-44°C, enhancing the efficacy of radiotherapy and chemotherapy [1]. To effectively treat deep-seated and sub-superficial tumors, state-of-the-art clinical ... En savoir plus

A critical element in understanding the pre-breakdown and breakdown mechanisms in gas/solid insulation systems is the triple point. This point is where two dielectric materials and a conductor intersect. Understanding these mechanisms at the triple point is crucial for designing systems ... En savoir plus