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线性结构的基于市场机制的鲁棒控制

ROBUST MARKET-BASED CONTROL METHOD FOR LINEAR STRUCTURE

  • 摘要: 系统建模不可避免地要忽略一些因素从而造成模型误差,因此基于不确定性的非精确模型来设计控制器显得尤为重要.随着各国学者的不断研究,在线性系统H控制方面取得了很大的发展,但仍存在求解过程繁琐、系统的保守性不强、结构复杂和控制器阶数较高等问题.运用计算结构力学与最优控制相模拟的理论来试图完善存在的问题.导引模就是结构力学中的本征值问题,即弹性稳定的欧拉(Euler)临界力或结构振动的本征频率;通过引入区段混合能的概念,采用精细积分和扩展的威廉姆斯(W-W)算法计算导引模,将此方法引入到基于市场机制的控制(market-based control,MBC)理论中,提出了线性结构基于市场机制的鲁棒控制策略.同时给出了在鲁棒控制下,采用李雅普诺夫(Lyapunov)直接法证明了结构基于市场机制的鲁棒控制器的稳定性及参数的确定方法.最后对一高层受控结构进行数值计算与分析,并与H鲁棒算法的控制效果进行了对比.结果表明,导引模不能取到临界值,否则会导致控制输入趋于无穷大.基于市场机制的鲁棒控制效果要好于H鲁棒算法,并且具有较强的应变能力和在线计算时间短等优点,能较好地适用于高层和大跨结构.

     

    Abstract: It is inevitable to ignore some factors during modeling, and thus lead to some model errors.So designing controllers based on uncertain non-precise model is very important.With the efforts of researchers, online system H control has yield great achievement.However, it still has some problems, such as complex solving process, weak conservation, complex structures and high order controllers.The present study uses computational structural mechanics and optimal control theory to try to solve these problems.Induced norm is an eigenvalue problem in structural mechanics, i.e.elastic and stable Euler critical force or eigenvalue of structural vibration.Precise integration with extended Wittrick-Williams(W-W) algorithm is used to calculate induced norm by introducing the concept of interval mixed energy.And then this method is introduced to Market-Based Control theory and the MBC robust control for linear system is proposed.In the robust control, the stability and parameter identification are validated through Lyapunov direct method.Finally, a high controlled structure is simulated to compare the performance of the MBC robust control and the H robust algorithm.The results indicate that the induced norm cannot reach critical force, and otherwise the control input will be infinite.MBC robust control is better than H robust control algorithm, and has better strain capacity and shorter online calculation time.MBC robust control can be used in high or long-span structures.

     

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