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第36届中国控制会议

作者： Ban Wang Lingxia Mu Youmin Zhang department of mechannical Industrial and Aerospace EngineeringConcordia University School of Automation Northwestern Polytechnical University

ISBN: (纸本)9781538629185

Sliding mode control is known as a robust control approach to maintain system performance and keep it insensitive to *** paper proposes an integral sliding mode based adaptive robust control for a quadrotor helicopter with parametric uncertainties and *** the help of the synthesized on-line adaptive scheme,the uncertain parameters can be accurately estimated without the knowledge of the uncertainty *** this case,there is no need to increase the discontinuous control gain,which may stimulate control chattering effect,to maintain the robustness of the *** effectiveness of the proposed control strategy is validated through a simulation of the payload transportation *** to the commonly used linear quadratic regulator（LQR） approach,the proposed adaptive robust control strategy can maintain the tracking performance during the whole flight phase.

关键词： Adaptive robust control integral sliding mode quadrotor helicopter payload transportation

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Crystallization and Corrosion Resistance of (Fe_(0.78)Si_(0.09)B_(0.13))100_(-x)Ni_x (x=0,2 and 5) Glassy Alloys

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Journal of Materials Science & Technology 2011年第12期27卷 1169-1177页

作者： Haitian Ma Weimin Wang die Zhang Guihua Li Chongde Cao Hongdi Zhang Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials （Ministry of Education） Shandong University Jinan 250061 China School of mechannical and Eiectrical Engineering Weifang University Weifang 261061 China Shandong Institute of Metrology Jinan 250014 China department of Applied Physics Northwestern Polytechnical University Xitan 710072 China

The crystallization of the （Fe0.78Si0.09B0.13）100-xNix glassy alloys （x=O, 2 and 5） has been investigated by X-ray diffraction （XRD） and differential scanning calorimeter （DSC）. Corrosion resistance analyses have been carried out using electrochemical measurements and corrosion products have been analyzed by scanning electron microscopy （SEM）. The experimental results show that the addition of Ni can promote the nucleation of c^-Fe, retard the decomposition of the metastable borides, and alter the crystallization mode of the present Fe-based glassy alloys. The lattice constant （ao^e） of c^-Fe in the annealed samples shows a decreasing trend with increasing annealing time. The Ni addition can improve the corrosion resistance of the as-quenched Fe-based glassy alloys in H2S04, NaCI and NaOH solutions. The results indicate that Ni can promote the diffusion of Si atoms during quenching and annealing processes.

关键词： Crystallization Corrosion resistance Fe-based glassy alloys

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