Tethered towing using open-loop input-shaping and discrete thrust levels |
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Institution: | 1. Department of Astronautics, Electric and Energy Engineering, Università di Roma La Sapienza, Italy;2. Department of Aerospace and Mechanical Engineering, Università di Roma La Sapienza, Italy;1. Samara National Research University, Samara, Russia;2. McGill University, Montreal, QC H3A 2K6, Canada |
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Abstract: | Asteroid retrieval, satellite servicing, and debris removal concepts often rely on a thrusting vehicle to redirect and steer a passive object. One effective way to tow the object is through a tether. This study employs a discretized tether model attached to six degree-of-freedom end bodies. To reduce the risk of a post-burn collision between the end bodies, discrete thrust input shaping profiles are considered including a Posicast input and a bang-off-bang thrust profile. These input shaping techniques attain desirable collision avoidance performance by inducing a tumbling or gravity gradient motion of the tethered formation. Their performance is compared to an earlier frequency notched thruster profile. |
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Keywords: | Space debris Active debris removal Tether Input shaping Bang-off-bang Posicast |
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