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| 1 | Task space control of free-floating space robots using constrained adaptive RBF-NTSM显示文摘Trajectory tracking control of space robots in task space is of great importance to space missions,which require on-orbit manipulations.This paper focuses on position and attitude tracking control of a free-floating space robot in task space.Since neither the nonlinear terms and parametric uncertainties of the dynamic model,nor the external disturbances are known,an adaptive radial basis function network based nonsingular terminal sliding mode(RBF-NTSM)control method is presented.The proposed algorithm combines the nonlinear sliding manifold with the radial basis function to improve control performance.Moreover,in order to account for actuator physical constraints,a constrained adaptive RBF-NTSM,which employs a RBF network to compensate for the limited input is developed.The adaptive updating laws acquired by Lyapunov approach guarantee the global stability of the control system and suppress chattering problems.Two examples are provided using a six-link free-floating space robot.Simulation results clearly demonstrate that the proposed constrained adaptive RBF-NTSM control method performs high precision task based on incomplete dynamic model of the space robots.In addition,the control errors converge faster and the chattering is eliminated comparing to traditional sliding mode control. | GUO ShengPeng LI DongXu MENG YunHe FAN CaiZhi | 2014 | Science China(Technological Sciences)2014，57，4： | 11 |
| 2 | Artificial frozen orbit control scheme based on J_2 perturbation显示文摘Since the inclination of frozen orbit with non-rotation of the perigee that occurs due to J2 perturbation must be equal to the critical inclination, this regulation has restricted the application of frozen orbit a lot. In this paper, we propose two control strategies to eliminate the secular growth of the argument of the perigee for orbits that are not at the critical inclination. One control strategy is using transverse continuous low-thrust, and the other is using both the transverse and the radial continuous low-thrusts. Fuel optimization in the second control strategy is addressed to make sure that the fuel consumption is the minimum. Both strategies have no effect on other orbital parameters’ secular motion. It is proved that the strategy with transverse control could save more energy than the one with radial control. Simulations show that the second control strategy could save 54.6% and 86% of energy, respectively, compared with the two methods presented in the references. | WANG GongBo, MENG YunHe, ZHENG Wei & TANG GuoJian* College of Aerospace and Material Engineering, National University of Defense Technology, Changsha 410073, China | 2010 | Science China(Technological Sciences)2010，53，11： | 4 |
| 3 | Research on hovering control scheme to non-circular orbit显示文摘An open-loop control system for hovering at any selected position on spacecraft orbit is first presented given that the satellite's engine provides continuous finite thrust.Actually,the hovering states are unstable considering perturbations and thrust errors,so a feedback sliding mode variable structure control,which is adaptive and chattering-free,is designed.Under this feedback control scheme,the high-frequency chattering phenomenon is avoided,while the system stays highly robust at the same time.Simulation results show that the feedback control thrusts are continuous and the steady-states error can be confined to 10 4 m at the presence of uncertain perturbations.Finally,the feasibility of realizing hovering orbits is analyzed taking the 'Moliya' and geosynchronous Earth orbit(GEO) satellites as examples. | WANG GongBo ZHENG Wei MENG YunHe TANG GuoJian | 2011 | Science China(Technological Sciences)2011，54，11： | 2 |
| 4 | Solution space analysis of Double Lunar-Swingby periodic trajectory显示文摘The Double Lunar-Swingby(DLS)periodic trajectory is a type of large-scale trajectory in Restricted Three-Body Problem framework.First,the principium of the DLS periodic trajectory is studied,and a preliminary design of the DLS trajectory is developed by the Patched Conic method.Second,the solution space of the DLS periodic trajectory is discussed in detail and in combination with numerical simulation,a distribution about orbital parameter relationship in the solution space is given.Finally,the variations of the orbital elements with different rotation angular velocities of geocentric apsidal line are found,and two typical orbits are given according to three reference frames.It is shown that Patched Conic method is feasible for the DLS periodic trajectory solution space analysis,and the conclusions will be valuable to the deep-space exploration orbit design in future. | LUO ZongFu ,MENG YunHe&TANG GuoJian College of Aerospace and Material Engineering,National University of Defense Technology,Changsha 410073,China | 2010 | Science China(Technological Sciences)2010，53，8： | 2 |
| 5 | Floquet-based design and control approach to spacecraft formation flying in libration point orbits显示文摘A method for spacecraft formation flying (SFF) design and control near libration point orbits was developed by making use of the Floquet theory for periodic orbits. Firstly, the Floquet theory used in libration point orbits was introduced and the coefficients of four Floquet periodic modes were proved to be nearly constant when the amplitude in z direction of earth-moon L1 halo orbits is less than 20000 km. On this basis, a configuration design approach to SFF in L1 halo orbits was proposed, and several types of special configurations were obtained with periodic mode 3 and mode 5 or mode 4 and mode 6. Then, in order to control the SFF configuration concisely, those coefficients of the 5 modes (except the stable one) must be kept constant. A stationkeeping method for SFF was developed, which controls 5 Floquet modes simultaneously. Finally, simulations showed that the Floquet-based approach of configuration design and control for SFF is effective, simple and convenient. The research may be of value for deep space explorations. | MENG YunHe ZHANG YueDong DAI JinHai | 2011 | Science China(Technological Sciences)2011，54，3： | 1 |
| 6 | Shape control of spacecraft formation using a virtual spring-damper mesh显示文摘This paper derives a distance-based formation control method to maintain the desired formation shape for spacecraft in a gravitational potential field. The method is an analogy of a virtual spring-damper mesh. Spacecraft are connected virtually by spring-damper pairs. Convergence analysis is performed using the energy method. Approximate expressions for the distance errors and control accelerations at steady state are derived by using algebraic graph representations and results of graph rigidity. Analytical results indicate that if the underlying graph of the mesh is rigid, the convergence to a static shape is assured, and higher formation control precision can be achieved by increasing the elastic coefficient without increasing the control accelerations. A numerical example of spacecraft formation in low Earth orbit confirms the theoretical analysis and shows that the desired formation shape can be well achieved using the presented method, whereas the orientation of the formation can be kept pointing to the center of the Earth by the gravity gradient. The method is decentralized, and uses only relative measurement information. Constructing a distributed virtual structure in space can be the general application area. The proposed method can serve as an active shape control law for the spacecraft formations using propellantless internal forces. | Chen Qifeng Meng Yunhe Xing Jianjun | 2016 | Chinese Journal of Aeronautics2016，29，6： | 1 |
| 7 | Reactionless robust finite-time control for manipulation of passive objects by free-floating space robots 显示文摘 | GUO Shengpeng LI Dongxu MENG Yunhe | 2014 | Chin Phys B2014，23，05： | 1 |
| 8 | Quantized anomalous Hall resistivity achieved in molecular beam epitaxy-grown MnBi_(2)Te_(4)thin films显示文摘The intrinsic magnetic topological insulator MnBi_(2)Te_(4)provides a feasible pathway to the high-temperature quantum anomalous Hall(QAH)effect as well as various novel topological quantum phases.Although quantized transport properties have been observed in exfoliated MnBi_(2)Te_(4)thin flakes,it remains a big challenge to achieve molecular beam epitaxy(MBE)-grown MnBi_(2)Te_(4)thin films even close to the quantized regime.In this work,we report the realization of quantized anomalous Hall resistivity in MBE-grown MnBi_(2)Te_(4)thin films with the chemical potential tuned by both controlled in situ oxygen exposure and top gating.We find that elongated post-annealing obviously elevates the temperature to achieve quantization of the Hall resistivity,but also increases the residual longitudinal resistivity,indicating a picture of high-quality QAH puddles weakly coupled by tunnel barriers.These results help to clarify the puzzles in previous experimental studies on MnBi_(2)Te_(4)and to find a way out of the big difficulty in obtaining MnBi_(2)Te_(4)samples showing quantized transport properties. | Yunhe Bai Yuanzhao Li Jianli Luan Ruixuan Liu Wenyu Song Yang Chen Peng-Fei Ji Qinghua Zhang Fanqi Meng Bingbing Tong Lin Li Yuying Jiang Zongwei Gao Lin Gu Jinsong Zhang Yayu Wang Qi-Kun Xue Ke He Yang Feng Xiao Feng | 2024 | National Science Review2024，11，2： | 0 |
| 9 | Cooperative fault detection and recovery in the GNSS positioning of mobile agent swarms based on relative distance measurements显示文摘Relative measurements are exploited to cooperatively detect and recover faults in the positioning of Mobile Agent(MA)Swarms(MASs).First,a network vertex fault detection method based on edge testing is proposed.For each edge,a property that has a functional relationship with the properties of its two vertices is measured and tested.Based on the edge testing results of the network,the maximum likelihood principle is used to identify the vertex fault sources.Second,an edge distance testing method based on the noncentral chi-square distribution is developed for detecting faults in the Global Navigation Satellite System(GNSS)positioning of MASs.Third,a recovery strategy for faults in the positioning of MASs based on distance measurement is provided.The effectiveness of the proposed methods is validated by a simulation case in which an MAS passes through a GNSS spoofing zone.The proposed methods are conducive to increasing the robustness of the positioning of MASs in complex environments.The main novelties include the following:(A)network vertex fault detection is based on concrete probability analysis rather than simple majority voting,and(B)the relation of detectability and recoverability of MAS positioning faults with the structure of the relative measurement network is first disclosed. | Qifeng CHEN Yunhe MENG Song LI Yuxin LIAO | 2022 | Chinese Journal of Aeronautics2022，35，5： | 0 |
| 10 | The rapid assembling of oligosaccharides by the developed HASP strategy显示文摘A new carrier containing three hydrophobic octadecyls was employed to improve the yield and purity of the synthesized oligosaccharides, and the applicability of hydrophobic carrier for HASP(hydrophobically assisted switching phase) was also explored. High performance liquid chromatography(HPLC) was used to analyze the purity of oligosaccharides and improve the elution efficiency. Elution system was optimized and replaced by isopropyl alcohol and water, in which the excess donor and other impurities had a better solubility than that in methanol. | Yunhe Wang Shuai Meng Tingting Yue Shuchun Li Zhongjun Li | 2018 | Chinese Chemical Letters2018，29，1： | 0 |
| 11 | Multi-modes control method for spacecraft formation establishment and reconfiguration near the libration points显示文摘This paper studies Multi-modes control method for libration points formation establishment and reconfiguration.Firstly,relations between optimal impulse control and Floquet modes are investigated.Method of generating modes is proposed.Characteristics of the mode coefficients stimulated at different time are also given.Studies show that coefficients of controlled modes can be classified into four types,and formation establishment and reconfiguration can be achieved by multi-impulse control with the presented method of generating modes.Then,since libration points formation is generally unstable,mutli-modes keeping control method which can stabilize five Floquet modes simultaneously is proposed.Finally,simulation on formation establishment and reconfiguration are carried out by using method of generating modes and mutli-modes keeping control method.Results show that the proposed control method is effective and practical. | Yuedong Zhang Yunhe Meng Jinhai Dai | 2012 | Theoretical & Applied Mechanics Letters2012，2，1： | 0 |
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