压电陶瓷精密控制系统的自适应模糊控制器研究

针对压电陶瓷等非线性系统,建立压电陶瓷微精密位移系统模型,并将模糊控制器替换传统的比例、积分和微分(PID)控制器,实现对PID参数的在线自整定。对模糊控制器的控制变量及论域等级等进行了研究及制定,并对其进行MATLAB仿真。实验结果表明,模糊逻辑控制器比传统PID控制器的响应速度快,超调量小,且控制策略简单易行。     

变论域模糊自整定PID控制器的研究

文章分析了模糊PID控制和变论域模糊控制的工作原理及其优缺点,结合二者的特点对变论域模糊自整定PID控制器进行了研究,该控制器解决了普通控制器的控制死区问题,可实现复杂系统的控制,并提高控制精度,适用性更强。     

模糊PID型电流控制器在异步电机调速系统中的应用

本文设计了一种二维模糊PID控制器作为SVPWM异步电机矢量控制系统的电流调节器，以改善这类系统电流的动稳态性能。基于对矢量控制中d、q轴电流响应性能的不同要求，论文给出了两种控制方案。仿真实验结果说明，电流环采用模糊PID控制器比采用常规的PI控制器具备更好的动稳态性能。     

Nonlinear PID control to improve the control performance of 2 axes pneumatic artificial muscle manipulator using neural network

The application of a robot to rehabilitation has become a matter of great concern because of the requirement of functional recovery therapy of arm or limb. A novel pneumatic artificial muscle (PAM) actuator which has achieved increased popularity to provide the inherent safety and mobility assistance to humans performing tasks and another advantages such as high strength and power/weight ratio, low cost, compactness, ease of maintenance, cleanliness, readily available and cheap power source and so on. However, the complex nonlinear dynamics of the PAM manipulator makes it a challenging and appealing system for modeling and control design. The problems with the time variance, compliance, high hysteresis and nonlinearity of pneumatic systems have made it difficult to realize precise position control. In order to realize satisfactory control performance, the effect of nonlinear factors contained in the PAM manipulator must be considered.The purpose of this study is to improve the control performance of 2 axes PAM manipulator using a nonlinear PID controller. Superb mixture of conventional PID controller and the neural network, which has powerful capability of learning, adaptation and tackling nonlinearity, brings us a novel nonlinear PID controller using neural network. This proposed controller is appropriate for a kind of plants with nonlinearity uncertainties and disturbances. The experiments were carried out in practical 2 axes PAM manipulator and the effectiveness of the proposed control algorithm was demonstrated through the experiments, which suggests its superior performance and disturbance rejection.     

模糊控制器的设计及其鲁棒性分析

本文主要分析了常规PID控制器、模糊自适应PI D控制器和变结构模糊PID控制器的原理.并设计了三种控制器。针对同一控制对象进行了MATLAB仿真,分别对比了被控对象参数和结构均不变、被控对象参数改变、被控对象结构改变三种不同情况下控制器的鲁棒性从仿真结果可以看出变结构模糊PlD控制器在三种情况下的鲁棒性最好。     

一类模糊PID控制器的设计与分析

通过介绍一类模糊比例积分微分（Proportional Integral Differential，PID）控制器的设计方法，分析比较其在不同系统模型下与单纯模糊控制器、常规PID控制器的控制效果，从而证明其不仅能够适应系统参数的变化，保持系统响应曲线好的动态特性，而且又能够消除系统的稳态误差，达到较好的静态特性。     

Minimum delay PID control of interpolated joint trajectories ofrobot manipulators

The digital implementation of an optimal PID (proportional integral derivative) controller of linearly interpolated joint trajectories is presented. The controller obtains optimal performance by reformulating the PID control law to minimize the time delay between the position transducer reading and the application of the corrective torque. Compared with the PID controller that is computed in a straightforward fashion, this formulation reduces the time delay by a factor of three. The superior performance of the proposed minimum-delay PID (MD PID) is demonstrated by experiments on a robot manipulator. Other practical issues associated with a digital PID control of joint trajectories of a robot manipulator, such as integer overflow and compensation for dynamics and joint-friction, are discussed     

Kinematics control of a pneumatic system by hybrid fuzzy PID

In a pneumatic system, normally, the piston can stop at only two terminal endpoints. In order to extend the capabilities of the system, this research is conducted to develop a kinematics control-based pneumatic system. Both position and velocity of the pneumatic piston are controlled in such a way that the controlled piston is able to move with the specified velocity to the target position. A hybrid of fuzzy and proportional-plus-integral-plus-derivative (PID) control algorithm is proposed in this paper as the solution. The control algorithm is separated into two parts: fuzzy control and PID control. The fuzzy controller is used to control the piston when the piston locates far away from the target position whereas the PID controller is applied when the piston is near the desired position. The development starts with designing of a position sensor to detect position information of the piston. The sensor-manipulating circuit consisting of potentiometer, inverting amplifier, summing amplifier, low-pass filter and analog-to-digital converter is then designed and realized. Next, the proposed hybrid of fuzzy and PID control is implemented and programmed on the microprocessor. In order to test performance of the system, settling time and steady-state error of five control algorithms – proportional (P) control, proportional-plus-integral (PI) control, proportional-plus-derivative (PD) control, PID control, and hybrid of fuzzy and PID control – are investigated. The results from the experiments show that the proposed hybrid of fuzzy and PID control gives the most satisfied settling time and steady-state error.     

Stable Fuzzy State Space Controller for Lateral Control of an AGV

The primary focus of the paper is on the development of an intelligent control scheme, which is insensitive to parametric uncertainty, load and parameter fluctuations and most importantly amenable for real time implementation. In this paper, we present a stable Lateral Fuzzy Controller (LAFC) for an outdoor Autonomously Guided Vehicle (AGV), which is a converted electrically powered golf-car. The controller performance is assessed both through simulations and experimental results. It is established that the fuzzy logic controller (FLC) yields good performance even under uncertain and variable parameters in the model, unlike the computed torque technique (CTT) or conventional PID control. In terms of real-time implementation the reduced computational complexity of the fuzzy controller as compared to the CTT, makes the fuzzy controller, an ideal choice amongst the two schemes.     

模糊工程PID在气动位置伺服中的应用

针对现有高精度气动位置伺服控制算法复杂,难于在工程上实现的问题。提出一种基于调整因子的模糊工程PID控制器,采用归一化加速度参量反映系统响应的快慢,引入变论域的思想构建模糊工程PID控制器的自调整机构。该机构根据系统误差和归一化加速度参量输出调整因子,动态调整基于工程整定法的模糊PID控制器的比例因子,以改变模糊控制器输入输出与模糊子集的映射关系,从而改善模糊控制器的动、静态性能。仿真与试验结果表明,该方法简单且具有良好的控制效果。     

基于BP神经网络的温度模糊PID控制器设计

根据BP神经网络对温度控制的要求设计出一种模糊PID控制器,采用误差和误差变化率作为模糊PID控制器的输入,PID参数作为模糊PID控制器的输出,使用一组模糊规则实现对PID参数的在线优化调节。采用Simulink图形化工具平台对模糊PID控制器和传统的PID控制器进行建模和仿真,结果表明和传统PID控制器相比,模糊PID控制器性能优良,使系统响应速度加快,超调减小。     

Robust loop shaping-fuzzy gain scheduling control of a servo-pneumatic system using particle swarm optimization approach

In this paper, a new technique called robust loop shaping-fuzzy gain scheduled control (RLS-FGS) is proposed to design an effective nonlinear controller for a long stroke pneumatic servo system. In our technique, a nonlinear dynamic model of a long stroke pneumatic servo plant is identified by the fuzzy identification method and is used as the plant for our design. The structure of local controllers is selected as PID control which is proven by many research works that this type of control has many advantages such as simple structure, well understanding, and high performance. The proposed technique uses particle swarm optimization (PSO) to find the optimal local controllers which maximize the average stability margin. In addition, performance weighting function which is normally difficult to obtain is automatically determined by PSO. By the proposed technique, the RLS-FGS controller can be designed, and the structure of local controllers is still not complicated. As seen in the simulation and experimental results, our proposed technique is better than the classical gain scheduled PID controller tuned by pole placement and the conventional fuzzy PID controller tuned by ISE method in terms of robust performance.     

Hybridized ABC-GA optimized fractional order fuzzy pre-compensated FOPID control design for 2-DOF robot manipulator

The robotic manipulator is an extremely nonlinear, multi-input multi-output (MIMO), highly coupled, and complex system wherein the parameter uncertainties and external disturbances adversely affect the performance of this system. From this, it necessitates that the controllers designed for such system must overcome these complexities. In this paper, we develop a novel fractional order fuzzy pre-compensated fractional order PID (FOFP-FOPID) controller for 2-degree of freedom (2-DOF) manipulator dealing with trajectory tracking problem. In order to optimize the controller’s parameters while minimizing integral of time absolute error (ITAE), a metaheuristic optimization technique, viz., artificial bee colony-genetic algorithm (ABC-GA) is presented. The efficacy of our proposed controller is demonstrated by comparing it with some existing controllers, such as integer order fuzzy pre-compensated PID (IOFP-PID), fuzzy PID (FPID), and conventional PID controllers. Furthermore, the robustness analysis for proposed controllers is also investigated for parameter variations and external disturbances. The simulation results indicate that FOFP-FOPID controller can not only guarantee the best trajectory tracking but also ameliorate the system robustness for parameter variations as well as external disturbances.     

模糊PID控制系统的设计与研究

为了解决工程中二阶系统的控制问题,在此对PID控制与模糊控制的原理进行了研究,并将二者的优势相互结合,设计了一种具有参数自整定功能的模糊PID控制系统。对PID参数初值的确定,隶属度函数的选取,模糊控制规则表的设计做了较为深入的研究。并利用Matlab/Simulink软件对控制系统进行了仿真研究。对阶跃输入下PID控制系统与该文设计的模糊PID控制系统的响应情况做出了定量的比较。结果表明对于二阶延迟系统,模糊PID控制器的超调量与调节时间均小于传统的PID控制,能显著提高控制效果。     

A hyperchaotic memristor oscillator with fuzzy based chaos control and LQR based chaos synchronization

Chaotic and hyperchaotic systems with interesting behaviors have been of interest in the recent years. In this paper we introduce a hyperchaotic memristor oscillator which shows both stable and unstable fixed points. Such systems have been less investigated in the literatures. It should also to be noted that the proposed hyperchaotic system has only one nonlinearity which is a flux controlled memristor. Depending on the control parameter, the system displays different behaviors and coexisting attractors. A linear quadratic regulator based synchronization of the proposed hyperchaotic system is designed and numerically analyzed. We also design such a fuzzy based PID controller for chaos control in such a memristor oscillator.     

磁阻式悬浮平台侧向气隙控研究

针对悬浮平台存在的侧向力干扰导致平台不能稳定悬浮的问题,设计了一种可以实现参数快速整定的模糊自适应PID侧向气隙控制系统。文中介绍了平台的悬浮结构和悬浮机理,采用有限元法分析了侧向位移对平台的影响,建立了控制系统静态、动态数学模型,并设计了模糊自适应PID控制器。通过MATLAB/Simulink软件对悬浮平台的侧向气隙控制系统进行建模仿真。结果表明,模糊自适应PID控制器响应速度快,且具有较强的鲁棒性。     

基于模糊PID控制的水轮机调节系统应用与仿真研究

针对水轮机调节系统的非线性、时变性及大惯性等特点,建立了其较为精确的数学模型,研究了模糊控制的基本原理,在此基础上构建了水轮机调节系统的模糊PID控制模型,并设计了适合水轮发电机组的模糊控制器,最后利用Matlab软件做了深入细致的仿真研究。研究表明,与常规的PID控制算法相比,引入模糊PID控制的水轮发电机组的调节特性得到了明显改善,并具有良好的动态品质。     

船舶用自动控制智能辅助系统设计

针对传统技术采用PLC等通用控制器已无法满足现代化自动控制智能系统要求的问题,文中利用高速、实时性好且内置CAN 控制器接口的DSP,采用变论域PID控制算法,设计基于DSP/F28335的船舶用自动化控制智能辅助系统控制器。文中搭建系统结构并介绍变论域PID算法,并在系统的实时混合仿真平台上进行了相关的干扰实验,用以对比基于传统PID控制器系统的控制效果。实验结果表明,使用变论域模糊PID控制算法的DSP控制器,可较大幅度提高船舶用自动智能控制辅助系统的实时性、抗干扰性和自适应性。     

基于Matlab的模糊PID控制系统设计及仿真

模糊PID控制是利用PID参数整定经验来使模糊控制器自动整定其参数,从而使PID控制器以变应变。文中采用Matlab软件设计模糊PID控制器,并应用于控制锅炉液位。通过实验仿真比较研究PID控制、模糊控制及模糊PID控制的控制效果。实验结果显示,模糊PID控制效果理想,具有较好的应用前景。     

模糊PID在拉拔机控制系统中的应用

针对拉拔机在拉拔的过程中因负载大小不同而引起不稳定和抖动的现象,设计了模糊PID控制器。模糊PID以系统偏差和偏差变化率作为输入,通过修改PID控制器的参数来获得满意的动态和静态控制性能。仿真结果表明,模糊PID在上升时间和稳态时间上分别比传统PID控制器缩短了0.119 s和0.503 s,在快速性和稳定性上明显优于传统PID控制器。采用这种控制器改善了控制系统的动态性能,提高了系统的控制精度。