Author Keywords: Multivariable systems; Flatness control; Rolling mills; Observers 相似文献
共查询到18条相似文献,搜索用时 453 毫秒
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针对空调系统的复杂情况,介绍了一种在线调整常规模糊控制器的量化因子和比例因子的设计方法,实时对常规模糊控制器进行优化。仿真表明,其动态性能和稳态性能都优于常规模糊控制器,具有良好的控制性能。 相似文献
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遗传算法是一种自适应、启发式、群体型、概率性、迭代式全局收敛算法,利用遗传算法的良好的搜索特性来优化模糊控制器,可以取得很好的控制效果.本文对传统的双种群遗传算法进行了归纳和分析,在此基础上提出了一种改进的双种群遗传算法(CGDPGA).将此改进算法用于优化模糊控制器的隶属度函数、量化因子和比例因子来实现模糊控制器的全... 相似文献
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该文先设计一个基于T—S模型的模糊PID控制器,为提高模糊控制的适应性,在分析量化因子和比例因子对系统性能影响的基础上,又制定了基于T—S模型的在线调整量化因子和比例因子的模糊调整规则,实现了模糊PID控制器在线自校正。其算法简单,系统实时性、鲁棒性好。对大纯滞后对象的仿真表明,该控制器明显改善系统的动态性能。 相似文献
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FNN模型参考自适应控制在轧机液压弯辊系统中的应用 总被引:1,自引:0,他引:1
UC轧机液压弯辊系统的数学模型具有很强的时变性和不确定性,是典型的非线性过程;针对UC轧机液压弯辊系统的特性,提出模糊神经网络模型参考自适应控制策略,并将其应用到液压巧辊控制系统中;仿真结果表明,模糊神经网络模型参考自适应控制能够很好的跟踪参考模型的设定,系统的响应快。 相似文献
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《计算机与应用化学》2016,(9)
针对加氢裂化中对闪蒸罐压力控制的非线性、滞后性等问题,本文提出一种基于遗传算法的模糊PID控制器,用于改善闪蒸罐压力控制效果。该控制器利用遗传算法优化模糊控制器的量化因子和比例因子,从而实现模糊PID控制器参数K_p、K_i、K_d的自适应调节。结果表明,优化后的模糊自适应PID控制器与常规PID控制器相比,提高了绝热闪蒸罐压力控制的自适应能力和鲁棒性,改善了系统的动态特性和静态性能,对非线性和时滞性的控制效果更好。 相似文献
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在模糊控制器的设计过程中,为了使模糊控制器的性能达到全局优化,应用免疫遗传算法对模糊控制器参数进行优化设计;在综合考虑各种参数对控制器性能影响的基础上,给出了一种全面优化隶属度函数、比例因子和量化因子的优化方法;利用了免疫算法能保持个体的多样性和能对学习过程进行引导的特点,对模糊控制器的多个参数同时进行优化,从而显著提高了系统的收敛性、稳定性。应用该方法对数控铣削加工过程的模糊控制器的设计进行了仿真,并与其他方法进行比较和控制实例的验证,表明了该基于免疫遗传算法优化的模糊器能获得更优良的控制性能。 相似文献
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The setup and control of the finishing mill roll gap positions required to achieve the desired strip head thickness as measured by the finish mill exit X-ray gauge sensor is made by an intelligent controller based on an interval type-2 fuzzy logic system. The controller calculates the finishing mill stand screw positions required to achieve the strip finishing mill exit target thickness. The interval type-2 fuzzy head gage controller uses as inputs the transfer bar thickness, the width and the temperature at finishing mill entry, the strip target thickness, the width and the temperature at finishing mill exit, the stand work roll diameter, the stand work roll speed, the stand entry thickness, the stand exit thickness, the stand rolling force, and the %C of the strip. Taking into account that the measurements and inputs to the proposed system are modeled as type-1 non-singleton fuzzy numbers, we present the so called interval type-1 non-singleton type-2 fuzzy logic roll gap controller. As reported in the literature, interval type-2 fuzzy logic systems have greater non-linear approximation capacity than that of its type-1 counterpart and it has the advantage to develop more robust and reliable solutions than the latter. The experiments of these applications were carried out for three different types of coils, from a real hot strip mill. The results proved the feasibility of the developed system for roll gap control. Comparison against the mathematical based model shows that the proposed interval type-2 fuzzy logic system equalizes the performance in finishing mill stand screw positions setup and enhances the achieved strip thickness under the tested conditions characterized by high uncertainty levels. 相似文献
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I. Hoshino M. Kawai T. Matsuura Hiroshi Kimura Hidenori Kimura 《Control Engineering Practice》1993,1(6):917-925
The synthesis methodology developed by Kimura (1985) based on the design theory of output regulators essentially due to Wonham (1974) has been applied successfully to the flatness control system for a 6-high cold rolling mill. The system has the following remarkable features.
1. (1) The structure of the controller is simple. This makes it easy to tune the control system.
2. (2) The controller copes well with the detection time delay, and thus high performance is obtained even at a low rolling speed.
3. (3) The flatness error caused by the rolling force variation in mill acceleration and deceleration time would be kept to a minimum by the function to adjust roll bending force using the signal of rolling force.
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Chih‐Keng Chen 《Asian journal of control》2013,15(4):1036-1050
In this study, a genetic‐fuzzy control system is used to control a riderless bicycle where control parameters can adapt to the speed change of the bicycle. The equations of motion are developed for a bicycle with constraints of rolling‐without‐slipping contact condition between the wheels and ground. This controller consists of two loops: the inner is a roll‐angle‐tracking controller which generates steering torque to control the roll angle while guaranteeing the stability, and the outer is a path‐tracking controller which generates the reference roll angle for the inner loop. The inner loop is a sliding‐mode controller (SMC) designed on the basis of a linear model obtained from a system identification process. By defining a stable sliding surface of error dynamics and an appropriate Lyapunov function, the bicycle can reach the roll‐angle reference in a finite time and follow that reference without chattering. The outer loop determines the proper reference roll‐angle by using a fuzzy‐logic controller (FLC) in which previewing and tracking errors are taken into consideration. The robustness of the proposed controller against speed change and external disturbances is verified by simulations. 相似文献
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Saptarshi Das Indranil Pan Shantanu Das Amitava Gupta 《Engineering Applications of Artificial Intelligence》2012,25(2):430-442
A novel fractional order (FO) fuzzy Proportional-Integral-Derivative (PID) controller has been proposed in this paper which works on the closed loop error and its fractional derivative as the input and has a fractional integrator in its output. The fractional order differ-integrations in the proposed fuzzy logic controller (FLC) are kept as design variables along with the input–output scaling factors (SF) and are optimized with Genetic Algorithm (GA) while minimizing several integral error indices along with the control signal as the objective function. Simulations studies are carried out to control a delayed nonlinear process and an open loop unstable process with time delay. The closed loop performances and controller efforts in each case are compared with conventional PID, fuzzy PID and PIλDμ controller subjected to different integral performance indices. Simulation results show that the proposed fractional order fuzzy PID controller outperforms the others in most cases. 相似文献
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Fuzzy PI control design for an industrial weigh belt feeder 总被引:4,自引:0,他引:4
An industrial weigh belt feeder is used to transport solid materials into a manufacturing process at a constant feedrate. It exhibits nonlinear behavior because of motor friction, saturation, and quantization noise in the sensors, which makes standard autotuning methods difficult to implement. The paper proposes and experimentally demonstrates two types of fuzzy logic controllers for an industrial weigh belt feeder. The first type is a PI-like fuzzy logic controller (FLC). A gain scheduled PI-like FLC and a self-tuning PI-like FLC are presented. For the gain scheduled PI-like FLC the output scaling factor of the controller is gain scheduled with the change of setpoint. For the self-tuning PI-like FLC, the output scaling factor of the controller is modified online by an updating factor whose value is determined by a rule base with the error and change of error of the controlled variable as the inputs. A fuzzy PI controller is also presented, where the proportional and integral gains are tuned online based on fuzzy inference rules. Experimental results show the effectiveness of the proposed fuzzy logic controllers. A performance comparison of the three controllers is also given. 相似文献