用于微循环实验的交变磁场的三维有限元仿真研究

目的:为深入了解螺线管型交变电磁场磁感应强度的时间和空间分布,本文研究了这种微循环实验中常用的医用磁场的三维有限元模型的建立及分析过程.方法:根据经典电磁场理论,应用Comsol Multiphysics多物理场耦合软件进行计算机辅助设计并赋予模型边界条件后进行网格划分,最后得到该模型的数值解.结果:成功拟合出螺线管型交变电磁场磁感应强度的轴向和径向衰减曲线.拟合结果与实际情况近似,并算出交变电磁场的时空分布.结论:本研究首次系统的建立了螺线管型交变电磁场的三维有限元模型,能够较精确的模拟该磁场磁感应强度分布,为进一步进行的磁场影响微循环系统的实验中磁场的定位问题提供了理论依据,并为进行血流在不同磁场中的血液动力学研究建立了仿真平台.

The Three-dimensional Finite-Element Simulation of Alternating Electromagnetic Fields for Microcirculation Experiments

Objective: In order to understand temporal and spatial distributions of alternating electromagnetic field (AEMF) of a coil thoroughly, the 3-D finite-element models of this kind of Biomagnetic Fields are established and analyzed for the research on bioeffect of magnetic field on microcirculation. Methods: Designing CAD models, setting boundary conditions, meshing models and obtaining numerical solutions were completed all within Comsol Multiphysics in terms of the theory of electromagnetic field. Results: Axial and radial plot of spatial attenuation rate of the AEMF, which were accordance with measured data, were simulated while the temporal and spatial distributions of AEMF were acquired. Conclusion: Models of 3-D finite-element of this kind of biomagnetic fields which appeared to exactly simulate the real magnetic field were first established systematically, and solved the placing problem of magnetic fields for the research on bioeffect of magnetic field on microcirculation and provided platforms for the simulation of hemodynamic of blood flow in the magnetic field.