共查询到19条相似文献,搜索用时 156 毫秒
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针对加热炉出口温度控制过程属于时变性、滞后性、具有分布参数等非线性过程,其数学模型难以精确建立,在传统控制中,出口温度往往又会受到多种干扰变量实时变化而缺乏控制能力。基于此,将模糊控制鲁棒性强、用语言模糊规则描述过程及无需建立数模等优点和神经网络自适应、自学习以及容错性强等优点相结合构成一种新型智能控制系统即自适应模糊神经网络控制系统对加热炉出口温度进行控制,同时对模糊控制和神经控制算法进行改进。经试验仿真证明,该控制对加热炉出口温度具有较好的动态性能,控制品质得到了提高。 相似文献
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讨论了RBF辨识网络的控制算法,并提出了一种新型PID控制器,该控制器利用神经元自适应PID的在线参数调整,采用RBF网络对被控对象在线辨识。仿真结果表明该控制器的控制效果优于传统的PID控制算法和模糊自适应PID控制算法。 相似文献
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基于BP神经网络PID控制及其仿真 总被引:2,自引:0,他引:2
对BP神经网络算法进行了改进,克服了直接使用神经网络算法进行PID控制的不足之处.仿真表明,设计了附加动量项的BP神经网络,能有效地提高算法的收敛速度.实验结果表明控制效果优于传统的PID控制算法的仿真结果. 相似文献
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介绍了模糊PID控制器结构,以及模糊控制规则的生成方法。设计了模糊PID控制器,并用于控制电加热炉炉温。用MATLAB语言对该控制方案进行数字仿真。 相似文献
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针对烧结混合料自动加水控制的难点,尤其是在烧结配料过程中自动加水系统的大滞后、非线性、低稳定性问题进行了加水控制算法研究。采用内环和外环方案分别控制两级混合机加水,设计基于粒子群优化(particle swarm optimization, PSO)算法优化BP(back propagation)神经网络联合模糊PID控制模型以解决时变、非线性系统的局限性问题。通过PSO算法对BP神经网络进行训练优化以获得最优控制参数,将预测的烧结料水分加入模型参与下一步控制。考虑系统存在较大延时,Simulink仿真中同步加入延时环节。仿真结果表明,相比BP神经网络模型,PSO-BP预测模型的拟合性能更加优越;相比PID、BP-PID控制算法,PSO-BP-PID控制算法在超调量、响应时间以及震荡周期等指标上均有显著提高。经梅钢4号烧结机实际应用数据表明,相比传统PID控制,PSO-BP-PID控制平均误差下降约45.75%,控制标准差下降约62.72%,可以明显提高混合料水分控制的精准度、稳定性、敏捷性,提高烧结过程的稳定性。 相似文献
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Based on the hydraulic bending control system, the electrohydraulic servo pressure control simulation model is built. Taking into account of the inadequacy of P-type immune feedback controller, an improved fuzzy immune PID controller is put forward. Drawing on immune feedback principle of biological immune system, the P-type immune feedback controller is connected with conventional PID controller in series and then in parallel with design fuzzy immune PID controller. The controller parameters can be adjusted on line by the rules of immune feedback controller and fuzzy controller. In order to gain the optimal parameters of the controller, the parameters of the controller are off-line optimized by the best multiple optimal model PSO algorithm. The simulation results indicate that the method has characteristics of small overshoot, short adjusting time and strong anti-interference ability and robustness. The quality of the strip shape can be further improved. 相似文献
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潘登 《金属材料与冶金工程》2009,37(3):62-64,67
针对精馏塔温度控制这个非线性耦合对象,提出了一种模糊神经元解耦智能控制器。该控制器避免了精馏塔精确数学模型的推导和严格计算解耦算式的麻烦,是模糊逻辑控制与神经元PID控制器的结合。同时,分析了控制器的结构及其学习算法。通过仿真试验,得到了较为理想的控制效果。 相似文献
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JIAChun-yu WANGYing-rui ZHOUHui-feng 《钢铁研究学报(英文版)》2004,11(6):25-29
Due to the complexity of thickness and shape synthetical adjustment system and the difficulties to build a mathematical model, a thickness and shape synthetical adjustment scheme on DC mill based on dynamic nerve-fuzzy control was put forward, and a self-organizing fuzzy control model was established. The structure of the network can be optimized dynamically. In the course of studying, the network can automatically adjust its structure based on the specific questions and make its structure the optimal. The input and output of the network are fuzzy sets, and the trained network can complete the composite relation, the fuzzy inference. For decreasing the off-line training time of BP network, the fuzzy sets are encoded. The simulation results indicate that the self-organizing fuzzy control based on dynamic neural network is better than traditional decoupling PID control. 相似文献
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通过对EFPT过程装置的硬件部分进行了介绍,阐述了现在装置控制中存在某些问题并对温度PID控制器进行了改进,利用模糊自整定的方法将PID参数进行预估,使系统的温度控制达到良好的效果. 相似文献
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In connection with the characteristics of multi-disturbance and nonlinearity of a system for flatness control in cold rolling process, a new intelligent PID control algorithm was proposed based on a cloud model, neural network and fuzzy integration. By indeterminacy artificial intelligence, the problem of fixing the membership functions of input variables and fuzzy rules was solved in an actual fuzzy system and the nonlinear mapping between variables was implemented by neural network. The algorithm has the adaptive learning ability of neural network and the indetermi- nacy of a cloud model in processing knowledge, which makes the fuzzy system have more persuasion in the process of knowledge inference, realizing the online adaptive regulation of PID parameters and avoiding the defects of the traditional PID controller. Simulation results show that the algorithm is simple, fast and robust with good control performance and application value. 相似文献