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1. Adaptive Back-Stepping Sliding Mode Attitude Tracking of Rigid Spacecraft with disturbances}%uthorCHN{张三丰ffil{1},李四ffil{2} | |||
LU Kunfeng,XIA Yuanqing | |||
Aviation 23 December 2012 | |||
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Abstract:The attitude tracking control problem for rigid spacecraft is investigated in thispaper. A novel adaptive approach is proposed with the utilization of sliding mode control(SMC) and backstepping techniques (BT) to not only achieve accurate attitude tracking control forspacecraft system, but also be robust against the inertia uncertainties and external disturbances. The proposed controller including the merits of SMC, BT and adaptive technique to provide fast response and accurate attitude tracking. The proposed controller is continuous, then it is chattering-free. What's more, the proposed controller does not include any information of unknown inertial matrix, then it can be used widely in practical application. Finally, simulation results are presented to illustrate effectiveness of the control strategies. | |||
TO cite this article:LU Kunfeng,XIA Yuanqing. Adaptive Back-Stepping Sliding Mode Attitude Tracking of Rigid Spacecraft with disturbances}%uthorCHN{张三丰ffil{1},李四ffil{2}[OL].[23 December 2012] http://en.paper.edu.cn/en_releasepaper/content/4502987 |
2. NTSM based finite-time control for 6DOF spacecraft formation flying system | |||
Lan Qixun,Li Shihua | |||
Aviation 13 December 2012 | |||
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Abstract:This paper considers the finite-timecontrol (FTC) problem of 6DOF spacecraft formation flying (SFF)system in the presence of externaldisturbances. Firstly, a nonsingularterminal sliding mode (NTSM) technique a finite time controller is proposed for 6DOF SFF system.Secondly, a finite-time disturbance observer (FTDOB) is introducedto estimate the disturbances , then acomposite controller which consists of a feedback controller basedon NTSM method and feed-forward compensation term based on FTDOBtechnique is obtained to ensure that the 6DOF spacecraft canreach the desired formation in finite time. The merit of theproposed method is that chattering is substantially reduced sincethe switching gain of the controller is only requiredto be greater than the bound of disturbance estimation error ratherthan that of disturbance. Finally,the effectiveness of the proposed methods are shown bysimulation results. | |||
TO cite this article:Lan Qixun,Li Shihua . NTSM based finite-time control for 6DOF spacecraft formation flying system[OL].[13 December 2012] http://en.paper.edu.cn/en_releasepaper/content/4501134 |
3. Near Space SAR Imaging Using Subaperture Technique | |||
Xiao Xin,Jing Xiaojun | |||
Aviation 06 December 2011 | |||
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Abstract:Near space, airspace above the ground about 20-100 km, is higher than existing aircraft flight height and lower than existing low orbit satellite, including Stratosphere, mesosphere and part of ionosphere. Near space have some unique advantage, but currently still no effective development and application, while troposphere and low-orbit space is increasingly scarce. Near space SAR geometric model is similar with the aircraft SAR, but little difference brings completely different result. This paper discusses the near space new environment character and proposes that full aperture should be divided into subaperture to adapt new environment character. Then the novel subaperture technique is applied to Range Doppler Algorithm (RDA), and a sub-band combination technique is introduced to compose the subaperture images. Simulation results show that the proposed method indeed seems to be a promising solution to near space SAR imaging. | |||
TO cite this article:Xiao Xin,Jing Xiaojun. Near Space SAR Imaging Using Subaperture Technique[OL].[ 6 December 2011] http://en.paper.edu.cn/en_releasepaper/content/4452905 |
4. A Unified Macro- and Micro-mechanics Constitutive Model of Fully Coupled Fields | |||
SUN Zhigang | |||
Aviation 24 December 2010 | |||
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Abstract:A unified macro- and micro-mechanics constitutive model of fully coupled electro-magneto-thermo-elastic multiphase functional composites is developed in this paper. The model is based upon the hypothesis of periods, the theory of uniformity and the generalized method of cells (GMC). By using the quadratic displacements, electric potentials and magnetic potentials, the accuracy of predicting the materials' constitutive model is improved. The original GMC is also improved in this paper by adopting surface-averaged quantities to be the primary variables that replace the coefficients of micro-displacements, electric potentials and magnetic potentials. Therefore, the computation is effective and efficiency. The prediction of a functional composite's constitutive model was performed and the curves between material constants and the volume fraction of fiber were obtained. | |||
TO cite this article:SUN Zhigang. A Unified Macro- and Micro-mechanics Constitutive Model of Fully Coupled Fields[OL].[24 December 2010] http://en.paper.edu.cn/en_releasepaper/content/4400790 |
5. Research on Sliding Mode Control of Folding-Wing Missile’s Lateral Overload | |||
Yang Liang,Yang Jianying | |||
Aviation 23 February 2009 | |||
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Abstract:Considering that the folding-wing missile deploys its wings in short time, and such a transient but complicated process has a strong influence on its math model, we simplify the process into model\ | |||
TO cite this article:Yang Liang,Yang Jianying. Research on Sliding Mode Control of Folding-Wing Missile’s Lateral Overload[OL].[23 February 2009] http://en.paper.edu.cn/en_releasepaper/content/29503 |
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