共查询到19条相似文献,搜索用时 93 毫秒
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分析当前模糊PID复合控制算法的控制特性及不足,提出优化改进的算法,即基于梯形隶属函数的模糊切换算法及仿人智能思想的在线调整算法,进而实现了自适应的模糊PID复合控制算法。通过实验研究,得到优化改进的模糊PID复合控制算法。该算法具有较好的稳定性、动态性、无静差等优点,其控制品质优于常规模糊PID复合控制算法,具有推广应用的价值。 相似文献
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针对传统PID无法实现负荷实时跟踪控制的问题,文中将传统PID控制与模糊控制相结合设计了一种模糊PID控制器,并以发电机实时负荷作为响应和输入,构筑出负荷跟踪型模糊PID主蒸汽温度串级控制系统.通过模糊算法得到PID控制器3个参数的校正值,实时跟踪负荷在线调整PID的3个参数,将主蒸汽温度控制在设定值附近.文中进行了负... 相似文献
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机载光电跟踪系统的模糊PID控制 总被引:1,自引:0,他引:1
为了提高机载光电跟踪系统的控制性能,提出了一种模糊自适应PID控制算法。首先,针对机载光电跟踪控制系统的特点,建立了被控对象的模型。接着,对机载光电跟踪系统模糊PID控制器的设计进行了详细介绍。最后,利用经典PID控制、模糊控制、模糊PID控制3种算法对机载光电稳定跟踪系统进行仿真比较。仿真结果表明模糊PID控制算法较之前两种算法具有响应快、超调量小、抗干扰能力强、稳态性能好等优点,对机载光电跟踪系统具有较好的控制能力。 相似文献
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首先利用非线性控制方法中的积分反步法设计了一种AQM算法,接着使用非线性控制方法中的模糊滑模变结构控制方法进行AQM算法的设计.仿真结果表明,与积分反步法相比,基于模糊滑模变结构控制的AQM算法性能上优于基于积分反步法的AQM算法.与基于线性控制方法的PID控制方法相比,基于积分反步法的AQM算法性能上优于基于PID控制的AQM算法. 相似文献
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模糊自整定PID控制器的FPGA实现 总被引:2,自引:0,他引:2
提出了一种基于VHDL描述、FPGA实现的模糊自整定PID设计。首先对模糊增量式数字PID的算法进行了介绍和数学推导,然后使用自顶向下的设计方法完成了控制器的VHDL分层设计,最后,在一个具体的FPGA芯片上实现了该控制器。由于采用了离线计算、在线查表的模糊自整定参数技术和增量式PID算法,本设计既降低了FPGA的资源耗费,又改善了传统PID控制器的控制性能。 相似文献
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薄膜材料的绕组处理是在一个高度非线性的动态系统中维持应力不变.提出一个为薄膜材料的绕组处理在不同摩擦锟供料速度下的适应模糊应力的控制系统.该提出的适应模糊应力的控制系统包括一个模糊应力控制器和一个适应调谐器.模糊应力控制器是主进度控制器,一个平移宽度的概念和变化模式技术被包括在模糊推论中以矫正模糊现象,而且只有一个参数因素需要被调整.为了对抗在实际应用中的不确定,一个失真压力的控制系统占据着简单控制框架,无震颤的,稳定跟踪性能和对不确定性的鲁棒的优势.与传统的比例积分应力控制方法相比较可提出的这种控制方法有显著的优势. 相似文献
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《Mechatronics》2017
During the composites winding process, running speed, tension fluctuation and other factors often lead to the tape deviation. To improve the winding precision and eliminate the running deviation, lateral dynamics of the tape winding is analyzed and mathematical model of the rectifying system is established. Then, a novel adaptive sliding mode controller (ASMC) is proposed, and principle of this control scheme is employing two fuzzy systems to approximate the nonlinear functions and utilizing another two fuzzy systems to adjust the feedback gain (FG) and switching gain (SG). Stability and convergence of the control system can be guaranteed by the Lyapunov theory and Barbalat Lemma. Simulation and experimental results show that the designed ASMC has highest control precision and much smaller input chattering when compared with other controllers. 相似文献
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Fuzzy neural control of voice cells in ATM networks 总被引:3,自引:0,他引:3
This paper presents the design of a fuzzy controller for managing cells generated by voice sources in asynchronous transfer mode (ATM) networks. Typical voice cells, characterized by a high degree of burstiness, complicate any attempt to use classical control theory in the design of an ATM cell rate controller. The fuzzy control approach presented in this paper overcomes this limitation by appealing to the linguistic ability of fuzzy set theory and logic to handle the complexity. Specifically, the cell rate control problem is linguistically stated but treated mathematically via fuzzy set manipulation. In particular, the ATM voice cell controller being proposed is an improved and intelligent implementation of the leaky bucket cell rate control mechanism extensively studied in the literature. This intelligent implementation of the leaky bucket mechanism uses a channel utilization feedback via the QoS parameters to improve its performance. This ATM fuzzy controller takes the form of an organized set of linguistic rules quantitatively expressed and manipulated by means of fuzzy set theory and fuzzy logic. The fuzzy control rules are stored in fuzzy associative memory to permit parallel executions 相似文献
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本文基于模糊控制理论研究了二级倒立摆的控制问题。二级倒立摆为多变量系统,为了解决模糊控制器规则组合爆炸问题,采用LQR控钢方法设计了融合函数以降低模糊控制器的输入变量维数,大大减少模糊控制的规则数,并研究了量化因子对控制效果的影响,通过设置闲值使量化因子可自动调节,进而提高模糊控制器的性能品质。仿真结果证明这种模糊控制算法规则数少,响应速度快,有良好的稳定性和鲁棒性。 相似文献
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WEI Qiu-yue WANG Wen-qing School of Automation Xi'an University of Posts Telecommunications Xi'an China 《中国邮电高校学报(英文版)》2011,(5):114-117,128
The long time-delay often exists in industrial process.In order to overcome the big overshoot and long regulating time of the long time-delay system control,a new fuzzy self-adaptive PI-Smith control method is proposed.This method combines the Smith predictive control with fuzzy self-adaptive proportional-integral(PI)control.The traditional proportional-integral-derivative(PID)controller in Smith predictive control is replaced by fuzzy PI controller which utilizes the principle of fuzzy control to tune parameters of PI controller on-line.The results of simulation for electric furnace show that the method has the advantages of shortening regulating time,no overshoot,no steady-state error,excellent control accuracy,and good adaptive ability to the change of system model. 相似文献
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自寻优模糊集的自调整模糊控制器及通用模糊控制器的硬件实现 总被引:1,自引:0,他引:1
在文[1][2]的基础上,本文给出了自寻优模糊集自调整模糊控制器算法.并在这种软件设计的基础上,与文[4][5]提出的硬件构想相结合,实现了通用模糊控制器的硬件实现,其原理是用软件确定最佳的模糊集和控制规则,而用CLC连续逻辑电路实现控制作用.将这种控制器与最佳整定的DDC控制效果进行了比较,表明本文所提出的模糊控制器是简单可行的,模糊控制器对时变系统、非线性系统等有着广阔的应用前景.这种硬件具有很强的通用性,为模糊控制的进一步推广创造了条件. 相似文献
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为了解决三相异步电动机起动电流较大的问题,采用了一种软起动模糊自适应控制器。据其起动特性,将电流误差和误差的变化率作为输入量,晶闸管的控制角作为输出量,设计出一种自调整比例因子的模糊自适应控制算法。随后做了Matlab环境下的仿真实验,并且与常规的PID控制方法和常规模糊控制方法进行比较,得到了模糊自适应控制算法具有优越性的结论。 相似文献
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电压模式Buck-Boost变换器是一个典型的非最小相位系统。根据DC-DC Buck-Boost变换器的工作特性,运用状态空间平均法建立其小信号模型,据此设计PI控制器参数。Buck-Boost变换器是一个时变的非线性系统,传统PI控制难以达到最优的控制效果,由此采用模糊PI控制来规避PI控制的弊端。针对模糊PI控制在被控量变化较大时,控制精确度变差的问题,设计了模糊论域自适应伸缩变化的变论域模糊PI控制器,对Buck-Boost电路进行控制。通过Matlab/Simulink环境仿真,实验结果表明,变论域模糊PI控制具有更好的动态控制性能。 相似文献
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Fuzzy linguistic rules provide an intuitive and powerful means for defining control behavior. Most applications that use fuzzy control feature a single layer of fuzzy inference, mapping a function from one or two inputs to equally few outputs. Highly complex systems, with large numbers of inputs, may also benefit from the use of qualitative linguistic rules if the control task is properly partitioned. This paper presents a modular fuzzy control architecture and inference engine that can be used to control complex systems. The control function is broken down into multiple local agents, each of which samples a subset of a large sensor input space. Additional fuzzy agents are employed to fuse the recommendations of the local agents. Real-time implementation without special hardware is possible by using singleton output values during fuzzy rule evaluation. A development tool is used to translate a fuzzy programming language offline for fast execution at run time. Using this system, a multilayered fuzzy behavior fusion based reactive control system has been implemented on an autonomous mobile robot, MARGE, with great success. MARGE won first place in Event III of the 1993 Robot Competition sponsored by the American Association for Artificial Intelligence 相似文献