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ＩＮＴＲＯＤＵＣＴＩＯＮＣｏｎｓｉｄｅｒａｂｌｅａｔｔｅｎｔｉｏｎｈａｓｂｅｅｎｆｏｃｕｓｅｄｏｎｔｈｅｃｏｎｔｒｏｌｐｒｏｂｌｅｍｏｆｕｎｃｅｒｔａｉｎｄｙｎａｍｉｃａｌｎｏｎ ｌｉｎｅａｒｓｙｓｔｅｍｓｓｕｂｊｅｃｔｔｏｅｘｔｅｒｎａｌｄｉｓｔｕｒｂａ 相似文献
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1989年初我从日本留学回到浙大工作。之初．我觉得应该像在国外一样仅仅从事基础性研究工作，那样既体现水平．又相对轻松。但几年过后觉得中国不仅需要高水平的创新性成果．同时需要科技推动经济的发展．解决中国经济快速发展过程中许多科学技术的关键问题。自当时的国家计委（现国家发展与改革委员会）在浙大设立了工业自动化国家工程研究中心（1992年）后，我更加体会到科技与经济的结合是多么重要。 相似文献
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ＩＮＴＲＯＤＵＣＴＩＯＮＩｎｒｅｃｅｎｔｙｅａｒｓ,ｒｏｂｕｓｔｃｏｎｔｒｏｌｏｆｄｙｎａｍｉｃａｌｓｙｓｔｅｍｓｗｉｔｈｓｉｇｎｉｆｉｃａｎｔｕｎｃｅｒｔａｉｎｔｉｅｓｗａｓｗｉｄｅｌｙｒｅｓｅａｒｃｈｅｄ .Ｍａｎｙｎｅｗａｐｐｒｏａｃｈｅｓｈａｖｅｂｅｅｎｐｒｏｐｏｓｅｄｂａｓｅｄｏｎｓｏｍｅｄｅｓｉｒｅｄｐｅｒｆｏｒｍａｎｃｅｓ.ＴｈｅＬｙａｐｕｎｏｖｆｕｎｃｔｉｏｎｃｏｍｍｏｍｌｙｕｓｅｄｔｏｓｙｎ ｔｈｅｓｉｚｅｔｈｅｃｏｎｔｒｏｌｌｅｒ(Ｌｉ,1 996;Ｙａｌｌａｐｒａｇａｄａｅｔａｌ.,1 996… 相似文献
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INTRODUCTIONDuetothefinitewordlength (FWL)effect,acasualcontrollerimplementationmaydegradethedesignedclosed loopperformanceorevendestabilizethedesignedstableclosed loopsys tem ,ifthecontrollerimplementationstructureisnotcarefullychosen .Theeffectsoffinite… 相似文献
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Study of the SISO mixed H2/l1 problem for discrete time systems showed that there exists a unique optimal solution which can be approximated within any prescribed missing error bound in l2 norm with solvable suboptimal solutions and solvable superoptimal solutions. 相似文献
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An adaptive terminal sliding mode control (SMC) technique is proposed to deal with the tracking problem for a class of high-order
nonlinear dynamic systems. It is shown that a function augmented sliding hyperplane can be used to develop a new terminal
sliding mode for high-order nonlinear systems. A terminal SMC controller based on Lyapunov theory is designed to force the
state variables of the closed-loop system to reach and remain on the terminal sliding mode, so that the output tracking error
then converges to zero in finite time which can be set arbitrarily. An adaptive mechanism is introduced to estimate the unknown
parameters of the upper bounds of system uncertainties. The estimates are then used as controller parameters so that the effects
of uncertain dynamics can be eliminated. It is also shown that the stability of the closed-loop system can be guaranteed with
the proposed control strategy. The simulation of a numerical example is provided to show the effectiveness of the new method.
Project supported by the National Outstanding Youth Science Foundation of China (NSFC:69725005) and the Zhejiang, Provincial
Natural Science Key Foundation of China (ZD9905) 相似文献
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随着我国经济的快速发展,高层建筑逐渐成为现代城市的重要部分之一。混凝土又作为高层建筑主要的结构形式,影响着整个建筑工程质量、寿命及安全性,所以混凝土的质量好坏受到业内广泛关注。混凝土本身是一种非均质脆性材料,由骨料、水泥和水组成。而结构中常出现开裂问题,裂缝会大大降低抗渗能力,直接导致耐久性的下降。而高层建筑混凝土产生裂缝的因素多种多样,本文就当前我国高层建筑混凝土产生的裂缝的原因进行分析研究。 相似文献