共查询到20条相似文献,搜索用时 15 毫秒
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一种新的自适应模糊滑模控制器设计方法 总被引:4,自引:0,他引:4
对一类非线性系统提出一种新的自适应模糊滑模控制器设计方法。将自适应模糊控制与滑模控制有效地结合在一起,先用滑模控制使跟踪误差进入边界层内,然后启动自适应模糊控制器。该控制器可消除滑模控制器中出现的抖振,并可在存在模糊逻辑系统逼近误差情况下使系统跟踪误差小于预先给定的任意常数。仿真算例验证了所提出方法的有效性。 相似文献
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不确定多输入非线性系统自适应模糊滑模控制器设计 总被引:2,自引:0,他引:2
针对一类不确定多输入非线性系统提出一种新的自适应模糊滑模控制器,该控制器在存在模型逻辑系统逼近误差的情况下使闭环系统跟踪误差小于预先给定常数,消除滑模控制中的抖振,缓解因系统维数增高所致的模糊规则爆炸现象,最后用仿算例验证了所提出方法的有效性。 相似文献
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模糊滑模控制研究综述 总被引:19,自引:0,他引:19
本文介绍了90年代以来将模糊逻辑和滑模控制相结合的研究工作,着重描述了模糊控制和滑模控制的相似性、启发式模糊滑模控制、直接和间接自适应模糊滑模控制、模糊神经网络在滑模控制中的应用等方面的原理和方法,分析了它们的特点和联系,本文最后还展望了这一领域的研究方向. 相似文献
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It is well known that control effort is the key factor considered in formation control of a multi-agent system (MAS). To reduce the controller effort, an economic event-triggered super twisting control (STC) protocol for the formation tracking of a nonlinear MAS, which avoids the unnecessary computations and transmission of control inputs among agents. Specifically, a distributed leader-follower control framework, combing the multi-input STC with event-triggered strategy, is proposed to ensure that the followers' states reach an agreement on the leaders state. Then, the sufficient conditions for the selection of controller parameters are formulated in terms of linear matrix inequalities (LMIs). On this basis, the event-triggered conditions for implementing the STC protocol in the network environment are obtained using Lyapunov stability theory. Simulation study is carried out to demonstrate the effectiveness and merits of the STC in terms of formation construction, trajectory tracking, and robustness to system uncertainties. 相似文献
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In this article, finite-time consensus algorithms for a swarm of self-propelling agents based on sliding mode control and graph algebraic theories are presented. Algorithms are developed for swarms that can be described by balanced graphs and that are comprised of agents with dynamics of the same order. Agents with first and higher order dynamics are considered. For consensus, the agents' inputs are chosen to enforce sliding mode on surfaces dependent on the graph Laplacian matrix. The algorithms allow for the tuning of the time taken by the swarm to reach a consensus as well as the consensus value. As an example, the case when a swarm of first-order agents is in cyclic pursuit is considered. 相似文献
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针对一类带有未知外部扰动的不确定非线性系统,建立自适应模糊滑模控制器。基于Lyapunov稳定性理论,设计系统可调参数的自适应规则,控制器的设计过程中无需知道系统的具体模型及未知非线性函数的先验知识。数值仿真的结果也验证了该方法的有效性。 相似文献
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采用滑模控制设计方法考虑了多智能体系统的鲁棒量化一致性问题。将多智能体系统的滑模面设计由考虑匹配不确定的情形推广到同时带有匹配和不匹配不确定性的情形,并采用线性矩阵不等式技术给出滑模面参数的求解方法。针对数字通信通道编解码的特点,充分考虑了量化参数不匹配和外部干扰等多种不利因素的影响,提出一种新的滑模到达控制律确保闭环系统能在有限时间到达设计的滑模面,实现量化一致性的目标。经计算机仿真实验比较验证了本设计方法的有效性。 相似文献
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This paper presents a new method combining sliding mode control (SMC) and fuzzy logic control (FLC) to enhance the robustness and performance for a class of non-linear control systems. This fuzzy sliding mode control (FSMC) is developed for application in the area for controlling the speed and flux loops of asynchronous motors. The proposed control law can solve those problems associated with the conventional control by sliding mode control, such as high current, flux and torque chattering, variable switching frequency and variation of parameters, in which a robust fuzzy logic controller replaces the discontinuous part of the classical sliding mode control law. Simulation results of the proposed FSMC technique on the speed and flux rotor controllers present good dynamic and steady-state performances compared to the classical SMC in terms of reduction of the torque chattering, quick dynamic torque response and robustness to disturbance and variation of parameters. 相似文献
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对于一类非线性不确定系统,常规滑模控制器存在"抖振"现象和抗外部扰动作用不理想等问题.本文运用自适应模糊系统逼近滑模控制器参数,并引入一个自适应模糊参数连续逼近常规滑模控制器的开关函数,最后给出一种新型自适应模糊滑模控制器,该方法克服函数和边界层法的不足.仿真实验结果表明该方法增强非线性系统的抗干扰能力和鲁棒性,并大大地削弱系统的"抖振"现象. 相似文献
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In this article, the resilient leaderless consensus problem for a multi-agent system (MAS) under denial-of-service(DoS) attack is investigated. The DoS attack is carried out with multiple strategies. The sufficient condition for MASs achieving consensus under multi-mode DoS attack is developed. In order to actively alleviate the influence caused by the DoS attack, the MAS switches between normal and secure modes. Once a DoS attack occurs, the agents will switch into the secure mode with a lower open-loop divergence rate. A dynamic event-based consensus protocol is proposed, driving the MAS achieve consensus while saving communication resources effectively. Moreover, rigorous proof analysis demonstrates the Zeno-free property of the developed dynamic event-triggered mechanism. Finally, a numerical simulation is provided to illustrate the effectiveness of the proposed theoretical results. 相似文献
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机器人操作器的自适应模糊滑模控制器设计 总被引:1,自引:0,他引:1
针对机器人动力学系统提出了一种基于模糊逻辑的自适应模糊滑模控制方案.根据滑模控制原理并利用模糊系统的逼近能力设计控制器,基于李雅谱诺夫方法设计自适应律,证明了闭环模糊控制系统的稳定性和跟踪误差的收敛性.控制结构简单,不需要复杂的运算.该设计方案柔化了控制信号,减轻了一般滑模控制的抖振现象.仿真结果表明了所提控制策略的有效性. 相似文献
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ZHANG Xiao-yu 《通讯和计算机》2009,6(1):53-60
Sliding mode-like fuzzy logic control (SMFC) algorithm for nonlinear systems is presented in this paper. Firstly dead zone parameters of sliding mode control (SMC) are selftuned by proper adaptive laws and then combined into fuzzy logic system (FLS) to compose the opportune fuzzy logic control (FLC), which is equivalent to the predesigned SMC controller with self-tuning parameters. Robustness and invariance to the uncertainties of the closed-loop systems are improved and chattering of the SMC is eliminated. Finally simulation results of numerical examples show that the proposed control algorithm is efficient and feasible. 相似文献
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Chaofang Hu Lei Cao Xianpeng Zhou Binghan Sun Na Wang 《Asian journal of control》2020,22(3):1163-1176
In this paper, a novel fuzzy adaptive nonlinear fault tolerant control design scheme is proposed for attitude dynamics of quadrotor UAV subjected to four sensor faults (bias, drift, loss of accuracy, loss of effectiveness). The sensor faults in Euler angle loop are transformed equivalently into a mismatched uncertainty vector, and other unknown items involving faults, uncertain parameters and external disturbances in angular velocity loop are lumped into an unknown nonlinear function vector. Fuzzy logic systems with adaptive parameters are used to approximate the mismatched uncertainty and lumped nonlinear function vectors. Dynamic surface control is applied to design the fault tolerant controller, and sliding mode control is introduced to improve the control accuracy. All signals of the closed‐loop control system are proved to be semi‐global uniformly ultimately bounded. Simulations demonstrate the effectiveness of the proposed approach for sensor faults. 相似文献
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现有研究成果大多仅考虑随机噪声或未知输入干扰单一存在的情况,实际工程中两者往往同时存在.在此背景下,本文针对一类含有未知输入干扰和随机噪声的非线性多智能体系统,提出了一种一致性控制协议方法.首先,针对单个智能体系统设计未知输入观测器以消除干扰项对状态估计的影响.参考Kalman滤波器算法来求解状态反馈矩阵,使得输出残差信号的协方差最小,从而增强系统对随机噪声的鲁棒性.然后,基于观测器的状态估计信息,设计了鲁棒一致性控制协议,并将其转化为线性矩阵不等式求解问题.最后,通过一个数值仿真证明了所提方法的正确性和有效性. 相似文献
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研究一类通信信道受限下“领导者-跟随者”结构的多智能体系统一致性跟踪问题.为了提升智能体的通信效率和降低能耗,引入事件触发机制与轮询协议相结合的混合调度策略,调节相邻智能体之间的信息传输,提高信道利用率.考虑到系统存在匹配的输入扰动,构建基于信道调度令牌的分布式滑模控制策略及协同设计方法,控制器仅依赖触发时刻的采样状态分量而不是实时状态信息,从而有效降低控制能耗,缓解数据冲突.所提出的协同控制策略不依赖于任何全局网络信息,因此,该控制策略的有效性不受网络规模的影响.通过Lyapunov稳定性理论,给出了系统一致性误差的跟踪分析来保证领导跟随一致性.同时,通过求解所提出的优化问题得到了调度协议参数和控制器增益.仿真实例验证了所提出协同控制策略的有效性. 相似文献
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The connectivity of communication graph is indispensable for consensus of multi-agent systems (MASs), which in many applications (e.g., wireless sensor) depends on the relative distances between agents. But, in the adaptive setting particularly with system nonlinearities and event-triggered communication, it is rather difficult to enforce the relative distances within the limited range for the connectivity. This paper focuses on developing an adaptive event-triggered control strategy with connectivity preservation in the context of nonidentical unknown control coefficients and heterogeneous nonlinearities coupling with parameter uncertainties. First, a group of potential functions are introduced acting as control barrier functions to constrain the relative distances between agents within the limited range for all time. Also, two dynamic gains are specialized for each agent to handle the system uncertainties, system nonlinearities and negative effect of the execution error. Then, an adaptive event-triggered protocol is designed for each agent such that the connectivity-preserving consensus of MASs is achieved and Zeno behavior is excluded. Moreover, an extended study is conducted on a leader-following scenario. Two simulation examples illustrate the effectiveness of the proposed event-triggered control strategy. 相似文献