Application of Input Shaping Technique on Propellant Sloshing Suppression
- Paper number
IAC-11,C2,3,11,x10473
- Author
Dr. Kai Dong, Beijing Institute of Astronautical Systems Engineering, China
- Author
Mr. Sun Mu, Beijing Institute of Astronautical Systems Engineering, China
- Year
2011
- Abstract
Input shaping technique is introduced in the designing of spacecraft control algorithm to minimize influence of propellant sloshing, which is a potential threat to space mission. Dynamical effects of sloshing are represented by equivalent mechanical model and input shapers are designed according to the parameters of the model. Constraints such as limited amplitude of sloshing disturbance, time optimization and capability of engine are set to ensure the feasibility of the designed input shapers. The presented simulation results indicate that the shapers could achieve the requirement of sloshing suppression successfully and the practicability of the design procedure is validated. Furthermore, comparison among the several input shapers shows that shaper which is designed based on energy optimization constraint, is also a time-suboptimal scheme. A control scheme based on input shaping technique was developed to suppress propellant sloshing. The dynamical effect of sloshing was modeled by an equivalent mechanical model. Several input shapers were designed according to the parameters of the model. Constraints on residual vibration, robustness, capability of thruster, time/fuel optimization and so on were factored in. Discussion on the effectiveness of the designed input shaper was carried out according to simulation results, and the presented results demonstrated that the shapers designed follow this procedure could achieve the requirement of sloshing suppression successfully. However, from the comparison on time/fuel cost, it was concluded that for the situation of single thruster, gains in performance and robustness come at a cost in maneuver speed, and for the situation of twin-thruster, the time-optimal scheme takes slightly less time than the fuel-optimal scheme but much more fuel than the latter one. Thus, the suggestion is that the constraint on time optimization could be relaxed in procedure of input shaper design if the energy-efficiency had been factored in.
- Abstract document
- Manuscript document
(absent)