Hybrid Passive/Active Vibration Control of a Loosely Connected Spacecraft System

In this paper,a hybrid passive/active vibration(HPAV)controller of a loosely connected spacecraft consisting of a servicing satellite,a target and an X-shape structure isolator is first proposed to suppress vibrations of the system when subjected to the impulsive external excitations during the on-orbit missions.The passive dynamic response of the combined system can be adjusted appropriately to achieve the desired vibration isolation performance by tuning the structural parameters of the bio-inspired X-shape structure.Moreover,the adaptive control design through dynamic scaling technique is selected as the active component to maintain high vibration isolation performance in the presence of parameter uncertainties such as mass of the satellite platform,the damping and rotation friction coefficients of the X-shape structure.Compared with the pure passive system and the traditional spring-mass-damper(SMD)isolator,the HPAV strategy witnesses lower transmissibility,smaller vibration amplitude and higher convergence rate when subjected to the post-capture impact.Numerical simulations demonstrate the feasibility and validity of the proposed hybrid control scheme in suppressing vibrations of the free-floating spacecraft.

Distributed vibration control of a large solar power satellite

To deal with the vibration problem of the solar power satellite(SPS),the distributed vibration control approach is investigated in this paper.Taking the Multi-Rotary joints SPS as the research objective,the control unit(CU)and the location relationship matrix are rstly de ned for distributed controller design according to the con guration of SPS.The dynamic model of each CU is therefore established based on the nite element method.The dynamic model of the whole SPS structure is then developed using the CU models,and is updated along with on-orbit assembly.The distributed cooperative controller,using proportional and di erential feedback and the interaction feedback among adjacent CUs,is proposed to suppress vibration.The close-loop distributed cooperative control system is then achieved by integrating all distributed controllers,and the asymptotic stability is proofed by the Lyapunov's stability theorem.To verify the feasibility of the proposed control system,three numerical cases are nally presented.The results demonstrate that the distributed cooperative controllers can e ectively suppress vibration during on-orbit assembly and operation after assembly,and the closed-loop system has good fault tolerance.

空间太阳能发电卫星的几个理论与关键技术问题

本文较为系统地阐述了发展空间太阳能发电卫星(space solar power satellite, SSPS)的几个问题.首先,论述了发展SSPS对世界人类从根本上解决能源危机,尤其是对我国生存与发展的极端重要性.其次,对聚光与非聚光两大类空间太阳能发电卫星的几个典型设计方案,从功质比(即单位质量所产生的电能)指标、工程实现、可靠性等方面,分析了它们的优缺点.再者,对作者团队2014年提出的SSPS-OMEGA方案的近期研究进展作了较为详细的讨论.最后,就本领域近期进展与未来需注意的几个理论与技术问题,提出了相应的观点.