随机空间结构动力失稳性能及主动模糊控制研究

项目名称： 随机空间结构动力失稳性能及主动模糊控制研究

项目编号： No.51208041

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 建筑环境与结构工程学科

项目作者： 马乾瑛

作者单位： 长安大学

项目金额： 25万元

中文摘要： 针对空间杆系钢结构在地震/风等动力荷载作用下容易发生动力失稳破坏的现象，考虑结构参数不确定性及荷载随机性的影响，推导随机结构数学模型，建立基于模糊参数区间的结构动力失稳评估方法；以响应速度快、效率高、性能稳定的压电堆为核心，设计制作简单可靠、具有大位移和大驱动力输出的双向受力压电主动杆件，通过静/动力特性及驱动性能测试，得到主动杆件具有机电耦合效应的电压-增益函数和稳定工作频段；进行考虑结构自身参数、外部荷载及控制律、增益相互耦合的优化研究；设计不依赖精确数学模型，能够较好解决复杂结构非线性控制问题且具有稳定性、鲁棒性的模糊逻辑控制律，通过直接引入误差的智能积分环节，实现对强实时性、多耦合性的多输入-多输出结构系统的主动控制，并进行试验验证。提出一套基于模糊理论、较为完整且适用性强的空间杆系钢结构动力失稳主动控制理论与技术。项目的研究不仅具有重要的理论意义，而且也具有广阔的工程应用前景。

中文关键词： 动力失稳；优化设计；模糊逻辑；主动控制；振动台试验

英文摘要： For the phenomenon of the space truss steel structures prone to dynamic instability when subjected to dynamic loads, such as earthquake or wind, considering the uncertainty effect of structure parameters and randomness load, deduce the mathematical model of stochastic sturcutre, then establish the criteria of dynamic instability of the structure based on fuzzy interval parameters. By the use of piezoelectric stack characterized by high-speed responsibility, high efficiency and stable performance, design a new type of driving level,which is simple, reliable, and a large displacement and big driving force for two-way. Through the static/dynamic properties and driving performance test, get voltage-gain function and stable working frequency range with electromechanical coupling. Optimal design will been conducted considering the coupling of structural parameters, external load with control law, and gain. Design a fuzzy logic control law which is not only independent of the accurate mathematical model and capable to solve the complex nonlinear control problem, but also stability and robustness, consider the error through intelligent integral, then realize an active control over the multi-input-multi-output system which is strong real-time, and high coupling, through experiment to test and verify the theories and meth

英文关键词： Dynamical Instability；Optimized Design；Fuzzy Logic；Active Control；Shaking Table Test