Two types of sensitivities are proposed for stat- ically stable sailcrafts. One type is the sensitivities of solar-radiation-pressure force with respect to position of the center of mass, and the other type is the sen...Two types of sensitivities are proposed for stat- ically stable sailcrafts. One type is the sensitivities of solar-radiation-pressure force with respect to position of the center of mass, and the other type is the sensitivities of solar-radiation-pressure force with respect to attitude. The two types of sensitivities represent how the solar-radiation- pressure force changes with the position of mass center and the attitude. Sailcrafts with larger sensitivities undergo larger error of the solar-radiation-pressure force, leading to larger orbit error, as demonstrated by simulation. Then as a case study, detailed formulas are derived to calculate the sensi- tivities for sailcrafts with four triangular sails. According to these formulas, in order to reduce both types of sensitivities, the angle between opposed sails should not be too large, and the center of mass should be as close to the axis of symmetry of the four sails as possible and as far away from the center of pressure of the sailcraft as possible.展开更多
The set of the orbital angular-momentum reversal,or H-reversal,sailcraft trajectory was born as a type of unconventional precursor interstellar mission trajectory by using highperformance solar sails.Starting from an ...The set of the orbital angular-momentum reversal,or H-reversal,sailcraft trajectory was born as a type of unconventional precursor interstellar mission trajectory by using highperformance solar sails.Starting from an outline of the H-reversal sail trajectory,this paper mainly focuses on the 2D reversal-mode solution to the general solar-photon sail motion equations.The feasible region for H-reversal trajectories in fixed sail attitude angles is illustrated.Some interesting applications of the H-reversal trajectory are presented in detail to show its advantages.As a special case,a precursor interstellar probe can be delivered with a constant sail orientation in the H-reversal trajectory to be compared with the direct-motion sail flyby of the Sun.Of importance are the heliocentric periodic orbits in double H-reversal modes,obtained via both fixed and time-varying sail attitude angles.Two more applications involving H-reversal trajectories are discussed in terms of asteroid deflection and transfer trajectory to rectilinear orbits.Finally,some items of the mathematics behind the 3D motion-reversal trajectories are summarized.展开更多
基金supported by the National Natural Science Foundation of China (10832004)China Postdoctoral Science Foundation (023200006)
文摘Two types of sensitivities are proposed for stat- ically stable sailcrafts. One type is the sensitivities of solar-radiation-pressure force with respect to position of the center of mass, and the other type is the sensitivities of solar-radiation-pressure force with respect to attitude. The two types of sensitivities represent how the solar-radiation- pressure force changes with the position of mass center and the attitude. Sailcrafts with larger sensitivities undergo larger error of the solar-radiation-pressure force, leading to larger orbit error, as demonstrated by simulation. Then as a case study, detailed formulas are derived to calculate the sensi- tivities for sailcrafts with four triangular sails. According to these formulas, in order to reduce both types of sensitivities, the angle between opposed sails should not be too large, and the center of mass should be as close to the axis of symmetry of the four sails as possible and as far away from the center of pressure of the sailcraft as possible.
基金the National Natural Science Foundation of China(No.11602019)the Young Elite Scientist Sponsorship Program by CAST(2016QNRC001)The Excellent Young Teachers Program of Beijing Institute of Technology(2015YG0605)is acknowledged as well.Autho。
文摘The set of the orbital angular-momentum reversal,or H-reversal,sailcraft trajectory was born as a type of unconventional precursor interstellar mission trajectory by using highperformance solar sails.Starting from an outline of the H-reversal sail trajectory,this paper mainly focuses on the 2D reversal-mode solution to the general solar-photon sail motion equations.The feasible region for H-reversal trajectories in fixed sail attitude angles is illustrated.Some interesting applications of the H-reversal trajectory are presented in detail to show its advantages.As a special case,a precursor interstellar probe can be delivered with a constant sail orientation in the H-reversal trajectory to be compared with the direct-motion sail flyby of the Sun.Of importance are the heliocentric periodic orbits in double H-reversal modes,obtained via both fixed and time-varying sail attitude angles.Two more applications involving H-reversal trajectories are discussed in terms of asteroid deflection and transfer trajectory to rectilinear orbits.Finally,some items of the mathematics behind the 3D motion-reversal trajectories are summarized.
