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首页> 外文期刊>Journal of guidance, control, and dynamics >Deorbiting Performance of Bare Electrodynamic Tethers in Inclined Orbits
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Deorbiting Performance of Bare Electrodynamic Tethers in Inclined Orbits

机译：倾斜轨道上的裸露电动系链的去轨性能

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摘要

The deorbiting capability of bare electrodynamic tethers in circular orbits of generic inclination has been investigated. It is seen that, in the ideal case of ohmic-limited current, the deorbiting time can be computed with reasonable accuracy by employing an eccentric tilted dipole model considering the time-averaged tangential Lorentz drag force during the slow, quasi-circular deorbiting process. The importance of including the dipole eccentricity is evident at near-polar inclinations, in which higher magnetic field harmonics play an increasing role in the deorbit dynamics. At such high inclinations, a simple centered tilted dipole model would strongly underestimate the electrodynamic tether deorbit capability. As for the real case, in which nonnegligible plasma contact impedance places an additional limitation on the collected current, a collection efficiency factor has been introduced. Its time-averaged value has been computed for different tether designs and orbits, accounting for minimum and maximum solar activities, and can be used as a scaling factor to obtain a crude estimation of the deorbiting time of a real electrodynamic tether starting from the analytical results of the ohmic-limited case. It is found that the orbit-averaged plasma collection efficiency of a bare electrodynamic tether increases with orbit inclination. This is mainly due to the decrease of the time-averaged electric field across the tether, which dominates over the decrease in plasma density experienced at higher latitudes.
机译：研究了裸露的电动系链在一般倾斜的圆形轨道上的去轨能力。可以看出，在理想的欧姆限制电流情况下，考虑到时间平均切向洛伦兹曳力，在缓慢的准圆形去轨道化过程中，通过采用偏心倾斜偶极子模型，可以以合理的精度计算出去轨道时间。在近极倾斜时，包括偶极偏心率的重要性显而易见，在这种情况下，较高的磁场谐波在去轨动力学中起着越来越重要的作用。在如此高的倾斜度下，简单的居中倾斜偶极子模型将严重低估电动系绳的去轨能力。至于实际情况，其中不可忽略的等离子体接触阻抗对收集的电流施加了额外的限制，因此引入了收集效率因子。已针对不同的系链设计和轨道计算了其时间平均值，并考虑了最小和最大太阳活动，并且可以用作缩放因子，以从分析结果开始获得对实际电动系链的脱轨时间的粗略估计欧姆限制的情况。发现，裸露的电动系链的轨道平均血浆收集效率随轨道倾斜度而增加。这主要是由于穿过系链的时间平均电场的减少所致，而这在高纬度地区所经历的等离子体密度的降低起了主导作用。

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  • 来源
    《Journal of guidance, control, and dynamics》 |2013年第5期|1550-1556|共7页
  • 作者

    Claudio Bombardelli; Denis Zanutto; Enrico Lorenzini;

  • 作者单位

    Universidad Politecnica de Madrid, E-28040 Madrid, Spain School of Aeronautical Engineering;

    University of Padova-CISAS, 35131 Padua, Italy Doctoral School STMS;

    University of Padova-CISAS, 35131 Padua, Italy Department of Industrial Engineering;

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