Welcome to the bio - geomagnetism group of the pgl in beijing 欢迎来到北京生物地磁学实验室！
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The subway can influence the observation of geomagnetism , geoelectric field and ground resistivity around it , but the influencing mechanism is not same 摘要地铁对周围地磁、地电场、地电阻率的观测都会产生影响，但影响的机理不尽相同。
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In this application , the lorentz force generated by the interaction between the current in the wire and the geomagnetic field produces an electro - dynamic drag leading to a fast orbital decay . in this paper , we make an intensive study of the process of de - orbiting using electro - dynamic tether system . the concrete work includes : firstly , i have studied the basic principle of how to generate the electro - dynamic drag , modeled via accuracy geomagnetism , made a concrete analysis of the de - orbiting duration , the magnitude and direction of electro - dynamic drag under the action of the dipole and accurate geomagnetic models , set up a counterbalance between electro - dynamic torque and gravity gradient torque , emulate the de - orbiting process of spacecraft , and compared the change of six orbital factors and the de - orbiting duration under the action of the dipole and accurate geomagnetic models 本文对基于电动力缆绳的航天器离轨过程进行了深入研究,具体工作如下:首先,本文研究了电动力缆绳产生电动力拉力的基本原理,建立了精确地磁场模型;分别在偶极子模型和精确地磁场模型作用下,对电动力拉力的大小、方向、离轨时间及电动力缆绳倾角的大小进行了计算分析;建立了电动力力矩与缆绳系统重力梯度力矩的平衡关系;分析了电动力力矩为系统提供能量的原理;最后分别在偶极子地磁场模型和精确地磁场模型作用下,对受电动力缆绳作用的航天器的离轨过程进行仿真,分析了在不同精度地磁场模型下,航天器离轨过程中各轨道参数的变化情况,并比较了不同模型对离轨时间的影响。
