共查询到20条相似文献,搜索用时 187 毫秒
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基于模糊神经网络的SBR污水处理控制系统研究 总被引:1,自引:0,他引:1
序批式活性污泥法(SBR)污水处理过程是一个具有随机性、时变性和耦合性的复杂过程,传统的时间程序控制或流量控制难以获得满意的控制效果;提出了一个具有五层的模糊神经网络控制系统,分析了控制模型与算法,利用神经网络的学习能力来优化模糊逻辑的规则以及比例因子的调整,可实现SBR反应过程的最优控制。通过用MATLAB软件对控制系统进行仿真分析,结果表明系统具有优良的性能。 相似文献
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针对不确定性二自由度机械臂的跟踪控制问题,为了同时保证控制系统的鲁棒稳定和鲁棒性能,提出了基于跟踪误差线性状态方程的H∞最优控制方法。首先建立了二自由度机械臂系统轨迹跟踪误差的状态方程,考虑系统中存在的不确定性和未知扰动,对误差状态推导出基于线性二次型性能指标的鲁棒H∞最优控制律,该控制律不仅保证了控制系统的鲁棒稳定而且使控制系统达到给定性能指标下的鲁棒最优性能。同时证明了闭环系统的渐进稳定性和线性二次型最优。由提出的广义控制力进而得到机械臂的控制力矩,实现鲁棒控制。最后应用simulink对系统进行仿真,仿真结果验证了方法的正确性和有效性。 相似文献
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基于模糊控制的桥式起重机定位防摆研究 总被引:1,自引:0,他引:1
针对线性二次型最优控制(LQR)法在起重机定位防摆中存在的不足,在分析了桥式起重机小车运行物理模型的基础上,将模糊理论引入起重机定位防摆中,提出了基于模糊理论控制的思想,设计了一种基于模糊的起重机定位与防摆控制方法.通过建立隶属度函数与模糊控制规则,利用两个模糊控制器对小车的位置和负载的摆动角度分别进行控制,建立了模糊控制系统.通过与LQR仿真结果进行比较,结果表明了该方法的可行性与较好的鲁棒性. 相似文献
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一种基于人工免疫原理的最优模糊神经网络控制器 总被引:1,自引:0,他引:1
提出了一种基于人工免疫原理的最优RBF模糊神经网络控制器设计方案.首先给出了控制器结构,其次将免疫进化算法用于控制器参数的优化,设计了一种满足二次型性能指标的最优RBF模糊神经网络控制器.将该控制器用于控制实际倒立摆系统,并采用状态变量合成方法以大大减少模糊规则的数目,实验结果验证了该控制器的有效性. 相似文献
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讨论了快速路匝道系统中智能控制技术问题。针对匝道系统特点,分析了模糊控制、人工神经网络、遗传算法的适用性,提出了一种基于模糊控制律的遗传神经匝道协调控制方案。在该方案中,对模糊控制输入输出数据进行线性修正,使用修正后的数据完成遗传神经网络训练,并用神经网络代替模糊控制器对匝道系统进行控制。给出了神经网络结构和遗传算法流程,并结合宏观交通流模型进行系统仿真。仿真结果表明,与模糊控制相比,控制效果显著提高。 相似文献
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N. Kumaresan 《Neural computing & applications》2012,21(3):497-503
In this paper, solution of generalized matrix Riccati differential equation (GMRDE) for indefinite stochastic linear quadratic
singular fuzzy system with cross-term is obtained using neural networks. The goal is to provide optimal control with reduced
calculus effort by comparing the solutions of GMRDE obtained from well-known traditional Runge Kutta (RK) method and nontraditional
neural network method. To obtain the optimal control, the solution of GMRDE is computed by feed forward neural network (FFNN).
Accuracy of the solution of the neural network approach to this problem is qualitatively better. The advantage of the proposed
approach is that, once the network is trained, it allows instantaneous evaluation of solution at any desired number of points
spending negligible computing time and memory. The computation time of the proposed method is shorter than the traditional
RK method. An illustrative numerical example is presented for the proposed method. 相似文献
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《Engineering Applications of Artificial Intelligence》2007,20(7):959-969
This paper presents a special rule base extraction analysis for optimal design of an integrated neural-fuzzy process controller using an “impact assessment approach.” It sheds light on how to avoid some unreasonable fuzzy control rules by screening inappropriate fuzzy operators and reducing over fitting issues simultaneously when tuning parameter values for these prescribed fuzzy control rules. To mitigate the design efforts, the self-learning ability embedded in the neural networks model was emphasized for improving the rule extraction performance. An aeration unit in an Aerated Submerged Biofilm Wastewater Treatment Process (ASBWTP) was picked up to support the derivation of a solid fuzzy control rule base. Four different fuzzy operators were compared against one other in terms of their actual performance of automated knowledge acquisition in the system based on a partial or full rule base prescribed. Research findings suggest that using bounded difference fuzzy operator (Ob) in connection with back propagation neural networks (BPN) algorithm would be the best choice to build up this feedforward fuzzy controller design. 相似文献
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This paper presents a novel quadratic optimal neural fuzzy control for synchronization of uncertain chaotic systems via H∞ approach. In the proposed algorithm, a self-constructing neural fuzzy network (SCNFN) is developed with both structure and parameter learning phases, so that the number of fuzzy rules and network parameters can be adaptively determined. Based on the SCNFN, an uncertainty observer is first introduced to watch compound system uncertainties. Subsequently, an optimal NFN-based controller is designed to overcome the effects of unstructured uncertainty and approximation error by integrating the NFN identifier, linear optimal control and H∞ approach as a whole. The adaptive tuning laws of network parameters are derived in the sense of quadratic stability technique and Lyapunov synthesis approach to ensure the network convergence and H∞ synchronization performance. The merits of the proposed control scheme are not only that the conservative estimation of NFN approximation error bound is avoided but also that a suitable-sized neural structure is found to sufficiently approximate the system uncertainties. Simulation results are provided to verify the effectiveness and robustness of the proposed control method. 相似文献
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In this paper, optimal control for stochastic linear singular system with quadratic performance is obtained using neural networks. The goal is to provide optimal control with reduced calculus effort by comparing the solutions of the matrix Riccati differential equation (MRDE) obtained from well known traditional Runge–Kutta (RK) method and nontraditional neural network method. To obtain the optimal control, the solution of MRDE is computed by feed forward neural network (FFNN). Accuracy of the solution of the neural network approach to the problem is qualitatively better. The advantage of the proposed approach is that, once the network is trained, it allows instantaneous evaluation of solution at any desired number of points spending negligible computing time and memory. The computation time of the proposed method is shorter than the traditional RK method. An illustrative numerical example is presented for the proposed method. 相似文献