共查询到15条相似文献,搜索用时 140 毫秒
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关于直升机姿态稳定性控制问题,由于直升机系统具有非线性,外部环境多变的干扰影响姿态稳定性.传统的建模与控制方法,面临构造Lyapunov函数难、控制稳定性难度大的问题.为解决上述问题,提出直升机系统离散模糊建模与姿态稳定控制方法.根据直升机系统姿态动力学模型,建立其连续、离散时间模糊模型.采用线性矩阵不等式(LMI)方法,提出离散模糊状态反馈控制方法.所得控制率,不仅使闭环系统渐进稳定且能够获得较好的控制性能.改进方法具有响应速度快、过度过程时间短、无超调、能有效抑制外部干扰等优点,表明了改进方法的有效性. 相似文献
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基于模糊PID的直升机模型飞行姿态控制 总被引:2,自引:0,他引:2
针对微型无人直升机具有非线性、多变量耦合等特性,利用模糊组合PID控制方法研究直升机模型飞行控制系统的姿态控制问题。首先以三自由度直升机模型为控制对象,建立动力学方程。然后对PID控制方法采用模糊控制算法进行改进。为使直升机模型能够平稳飞行,且具有较强的鲁棒性,基于解耦的直升机模型分别设计模糊-PID阈值切换和加权控制方法,对直升机模型的俯仰轴和横侧轴进行控制。最后将所提出的控制方法应用于直升机模型本体实现姿态优化,实时仿真效果说明所设计方法的可行性和有效性。 相似文献
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研究了一类非线性系统的模糊变结构控制问题,并给出了稳定性证明。通过将非线性系统化为多个精确T—S模型来建立非线性系统精确的T—S模糊模型,将模糊理论与成熟的线性变结构控制理论相结合设计一种模糊变结构控制器,用Lyapunov稳定性理论证明该控制器能确保模糊动态模型全局渐近稳定,从而使非线性系统稳定。仿真结果表明了该设计方法的有效性。 相似文献
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用T-S模糊系统来逼近非线性系统,它的IF-THEN规则后件由线性状态空间子系统构成,进而可以应用模糊系统的控制理论求得模糊控制器,用此非线性控制器来控制非线性系统,以求良好的控制效果;将模糊控制技术应用于混沌控制中,可以克服反馈线性化等传统方法对参数完全精确已知的限制;模糊规则后件部分以局部线性方程形式给出的T-S模糊模型可以通过调整相关参数很好地逼近混沌系统,基于该模型采用平行分散补偿技术设计出具有相同规则数目的模糊控制器,控制器所有参数可以通过求解一组线性矩阵不等式一次性得到。仿真结果验证了该方法的有效性。 相似文献
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In order to design a nonlinear controller for small-scale autonomous helicopters, the dynamic characteristics
of a model helicopter are investigated, and an integrated nonlinear model of a small-scale helicopter for hovering
control is presented. It is proved that the nonlinear system of the small-scale helicopter can be transformed to a linear
system using the dynamic feedback linearization technique. Finally, simulations are carried out to validate the nonlinear
controller. 相似文献
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This paper proposes a novel method for the incremental design and optimization of first order Tagaki-Sugeno-Kang (TSK) fuzzy controllers by means of an evolutionary algorithm. Starting with a single linear control law, the controller structure is gradually refined during the evolution. Structural augmentation is intertwined with evolutionary adaptation of the additional parameters with the objective not only to improve the control performance but also to maximize the stability region of the nonlinear system. From the viewpoint of optimization the proposed method follows a divide-and-conquer approach. Additional rules and their parameters are introduced into the controller structure in a neutral fashion, such that the adaptations of the less complex controller in the previous stage are initially preserved. The proposed scheme is evaluated at the task of TSK fuzzy controller design for the upswing and stabilization of a rotational inverted pendulum. In the first case, the objective is a time optimal controller that upswings the pendulum in to the upper equilibrium point in shortest time. The stabilizing controller is designed as a state optimal controller. In a second application the optimization method is applied to the design of a fuzzy controller for vision-based mobile robot navigation. The results demonstrate that the incremental scheme generates solutions that are similar in control performance to pure parameter optimization of only the gains of a TSK system. Even more important, whereas direct optimization of control systems with more than 35 rules fails to identify a stabilizing control law, the incremental scheme optimizes fuzzy state-space partitions and gains for hundreds of rules. 相似文献