基于参数自整定模糊PID控制液压万能试验机控制研究

为了能够提高液压万能试验机测试材料力学性能的准确性,深入地研究了参数自整定PID控制现在其中的应用。首先,分析了参数模糊自整定PID控制的基本原理;接着,设计了参数模糊自整定PID控制器的基本结构;然后,确定了参数模糊自整定PID控制器初始参数;接下来,进行了参数自整定模糊PID控制器参数的模糊化;最后,参数自整定PID控制液压万能试验机控制仿真研究,结果表明该控制方法具有较好的控制鲁棒性。     

迭代反馈整定在直流主传动系统中的应用

迭代反馈整定控制方法实现简单、收敛性好,在未知系统模型的前提下,能够对系统控制器参数进行整定, 使系统控制性能趋向优化。将迭代反馈整定方法引入到传统的PID控制器中,构成一种IFT-PID控制器,该控制器能够完成PID参数在线自整定。将该控制器应用到宝钢2050粗轧直流主传动系统中,结果表明在外界扰动和系统工况发生变化时,该控制器能够在线完成控制器参数自整定,使控制系统取得满意的控制效果。     

基于MATLAB的模糊PID参数自整定仿真研究

提出一种参数自整定模糊PID控制器,利用模糊推理的方法实现对PID参数的在线自动整定.通过计算机仿真加以实现并与传统的PID控制进行了比较,仿真结果表明,该控制器明显地改善了控制系统的动态性能,并且此方法计算量少,易于实现,便于工程应用.     

PID参数模糊自整定控制器的设计与研究

在常规PID控制和模糊控制研究的基础上,提出了一种PID参数模糊自整定控制器,采用模糊推理对PID控制器的控制参数进行在线调整,给出了参数整定的基本原则。并用MATLAB中SIMULINK和FUZZY工具箱对三种控制方式进行了仿真。仿真结果表明,PID参数模糊自整定控制器的控制性能优于常规PID控制和模糊控制,具有良好的抗干扰性和鲁棒性。     

基于Kalman滤波模糊PID控制的直流调速系统

为了提高直流调速系统的控制性能,针对系统中存在的非线性及结构参数变化范围大的特点,提出了一种基于Kalman滤波的参数自整定模糊PID控制器。该控制器将传统的PID控制算法与模糊控制算法相结合,通过对误差及误差变化的在线识别,实现对PID参数的自整定,并采用Kalman滤波对信号进行滤波处理。Matlab仿真结果表明,与传统的线性PID控制器相比,该控制系统具有良好的动态和稳态性能,鲁棒性强,控制性能显著提高。     

基于模糊自整定PID的力控制磨削实验研究

为保证磨削过程中法向磨削力的稳定,建立了基于X-Y数控平台的力控制磨削系统,该系统是一个非线性、时变的实时控制系统。分析了磨削过程的动力学模型并写出其状态方程。根据状态方程设计了模糊自整定PID控制器,用遗传算法整定PID参数,并记录整定过程中的输入-输出数据组,由数据组生成模糊控制规则。用该控制器与普通PID控制器进行了仿真对比,并在仿真过程中加入误差和突变信号以检验控制器的自适应性。在X-Y数控平台上进行了力控制磨削实验研究,结果表明模糊自整定PID力控制磨削方法能减小力波动,提高力控制精度。     

基于GA优化的电渣重熔炉模糊PID控制研究

针对电渣重熔炉电极进给控制系统中存在的非线性、抗干扰性能差等难点问题,提出了一种基于遗传算法优化的模糊自整定PID控制方法。首先通过分析电极进给控制系统的组成及运行机理,建立了控制系统的仿真平台,然后采用模糊控制器与传统PID控制器相结合的策略,设计出一种具有自调整功能的模糊自整定PID控制器,最后应用遗传算法对模糊自整定PID控制器的隶属度函数进行动态优化,克服了隶属度函数选取的主观性和盲目性,进一步提高控制系统的自适应能力。仿真结果表明,优化后的模糊自整定PID控制器具有很好的快速性和较强的鲁棒性,满足了系统高精度的控制要求。     

交流伺服系统中PID参数模糊自整定控制器

为了改善以交流永磁同步电机为控制对象的伺服系统性能,在PID控制规律和模糊控制算法研究的基础上,提出了一种PID参数模糊自整定控制器。利用模糊推理方法建立了模糊控制规则,对交流伺服电机控制中的PID参数实现了自整定,并在Matlab中进行了仿真。仿真结果表明,该控制器改善了常规PID控制器的性能,使伺服系统具有良好的动、静态性能。     

模糊参数自整定PID控制器的设计与仿真研究

为实现PID参数的自动整定,在PID控制和模糊控制的基础上,设计了一种用于某型热像仪分子筛激活机中恒温炉温控系统的模糊参数自整定PID控制器,它基于PID参数的优化规律利用模糊控制规则对PID参数进行在线的自动整定.与常规PID温控系统比较,该控制器的系统超调量明显减小,控制系统的动静态性能均得到改善,升温速度和目标温度控制精度超过了设计指标,且结构简单、计算量小.系统仿真验证了该设计的有效性与实用价值.     

基于FPGA的模糊PID控制纱线张力的应用研究

为解决纺织业中纱线张力难以实时控制的问题,基于模糊PID控制器的自身优势,将参数自整定模糊PID控制技术应用于纱线张力控制中.通过Matlab构建了参数自整定模糊PID与传统PID相对比的仿真模型,运用QuartusII开发环境,利用原理图设计与VHDL设计相结合的方式,在现场可编程门阵列(FPGA)中完成了参数自整定模糊PID控制器,并对输入数据进行了测试.实验结果表明,参数自整定模糊PID控制器可更快的达到稳定状态,超调量小,顶层电路系统设计稳定可靠,可用于纱线张力控制.     

New tuning method for PID controller

In this paper, a tuning method for proportional-integral-derivative (PID) controller and the performance assessment formulas for this method are proposed. This tuning method is based on a genetic algorithm based PID controller design method. For deriving the tuning formula, the genetic algorithm based design method is applied to design PID controllers for a variety of processes. The relationship between the controller parameters and the parameters that characterize the process dynamics are determined and the tuning formula is then derived. Using simulation studies, the rules for assessing the performance of a PID controller tuned by the proposed method are also given. This makes it possible to incorporate the capability to determine if the PID controller is well tuned or not into an autotuner. An autotuner based on this new tuning method and the corresponding performance assessment rules is also established. Simulations and real-time experimental results are given to demonstrate the effectiveness and usefulness of these formulas.     

PID参数继电自整定方法的研究

PID控制因其结构简单,鲁棒性好等特点,得到了工业界的广泛认可。而控制器的性能直接影响到生产过程的运行和产品的质量,控制器参数的整定至关重要,所以对PID参数整定方法的研究有很重要的意义,而继电整定算法是较有代表性的一种算法。文章基于继电器反馈对PID控制器参数自整定方法进行了研究,通过分析对象在继电特性作用下的输入输出响应曲线的波形,利用面积法估算得到系统的临界周期和振幅,并最终求得理想的PID控制参数。     

模糊自适应PID控制器的设计

本文利用滞环继电反馈控制获取时滞对象的临界参数，按给定相角裕度法整定PID的初值，再结合模糊推理在线整定PID的参数。此整定方法有效地把专家经验应用于PID参数调节中，控制器集模糊控制器和PID控制器的优点于一身。仿真表明：该整定策略系统控制性能得到了很大的改善，是实现自动工业控制器的一种简单．实用的方法。     

电子送经控制系统的PID参数整定方法的研究

对织机送经系统的PID控制方法作了详细的介绍,在先前得到的送经系统模型传递函数的基础上,采用最小二乘法得到送经系统带有时延的一阶模型,通过对比3种典型的PID参数整定方法,得出采用数值最优化方法得到的整定参数最理想,文中运用该方法给出了该模型下的送经控制器的PI控制参数整定结果.     

主蒸汽温度控制系统PID参数优化与仿真研究

通过分析主汽温调节对象的动静态特性,得出该控制系统的设计原则,从而用Z-N整定方法设计出PID控制器的控制参数,结果证明用Z-N整定方法整定的PID控制器对主蒸汽温度具有良好的控制效果,可见Z-N整定能很好的应用于主蒸汽温度控制系统中。     

气候环境实验室地面结冰云雾模拟控制系统设计

飞机结冰会引起飞机气动特性、动力系统性能改变,甚至造成飞行事故。地面结冰云雾模拟设施作为一种模拟飞机飞行结冰条件的重要设备,常用于飞机防除冰系统功能验证。针对气候环境实验室结冰云雾试验条件需要,在对地面结冰云雾模拟系统进行研究的基础上,对适用于气候环境实验室的结冰云雾模拟系统进行了设计。对系统关键设计技术、系统功能及组成进行了分析,并对控制系统方案进行了详细阐述。试验表明,控制系统人机界面友好,运行可靠,能够满足液态水含量、雾滴直径参数的精确调节,产生符合试验所需的结冰环境。     

Disturbance-rejection-based tuning of proportional–integral–derivative controllers by exploiting closed-loop plant data

A systematic data-based design method for tuning proportional–integral–derivative (PID) controllers for disturbance attenuation is proposed. In this method, a set of closed-loop plant data are directly exploited without using a process model. PID controller parameters for a control system that behaves as closely as possible to the reference model for disturbance rejection are derived. Two algorithms are developed to calculate the PID parameters. One algorithm determines the optimal time delay in the reference model by solving an optimization problem, whereas the other algorithm avoids the nonlinear optimization by using a simple approximation for the time delay term, enabling derivation of analytical PID tuning formulas. Because plant data integrals are used in the regression equations for calculating PID parameters, the two proposed algorithms are robust against measurement noises. Moreover, the controller tuning involves an adjustable design parameter that enables the user to achieve a trade-off between performance and robustness. Because of its closed-loop tuning capability, the proposed method can be applied online to improve (retune) existing underperforming controllers for stable, integrating, and unstable plants. Simulation examples covering a wide variety of process dynamics, including two examples related to reactor systems, are presented to demonstrate the effectiveness of the proposed tuning method.     

An analytical method for PID controller tuning with specified gain and phase margins for integral plus time delay processes

In this paper, an analytical method is proposed for proportional-integral/proportional-derivative/proportional-integral-derivative (PI/PD/PID) controller tuning with specified gain and phase margins (GPMs) for integral plus time delay (IPTD) processes. Explicit formulas are also obtained for estimating the GPMs resulting from given PI/PD/PID controllers. The proposed method indicates a general form of the PID parameters and unifies a large number of existing rules as PI/PD/PID controller tuning with various GPM specifications. The GPMs realized by existing PID tuning rules are computed and documented as a reference for control engineers to tune the PID controllers.     

Design of PID controllers in double feedback loops for SISO systems with set-point filters

A PID controller is widely used to control industrial processes that are mostly open loop stable or unstable. Selection of proper feedback structure and controller tuning helps to improve the performance of the loop. In this paper a double-feedback loop/method is used to achieve stability and better performance of the process. The internal feedback is used for stabilizing the process and the outer loop is used for good setpoint tracking. An internal model controller (IMC) based PID method is used for tuning the outer loop controller. Autotuning based on relay feedback or the Ziegler-Nichols method can be used for tuning an inner loop controller. A tuning parameter (λ) that is used to tune IMC-PID is used as a time constant of a setpoint filter that is used for reducing the peak overshoot. The method has been tested successfully on many low order processes.     

Improving disturbance rejection of PID controllers by means of the magnitude optimum method

The magnitude optimum (MO) method provides a relatively fast and non-oscillatory closed-loop tracking response for a large class of process models frequently encountered in the process and chemical industries. However, the deficiency of the method is poor disturbance rejection performance of some processes. In this paper, disturbance rejection performance of the PID controller is improved by applying the“disturbance rejection magnitude optimum” (DRMO) optimisation method, while the tracking performance has been improved by a set-point weighting and set-point filtering PID controller structure. The DRMO tuning method requires numerical optimisation for the calculation of PID controller parameters. The method was applied to two different 2-degrees-of-freedom PID controllers and has been tested on several different representatives of process models and one laboratory set-up. A comparison with some other tuning methods has shown that the proposed tuning method, with a set-point filtering PID controller, is quite efficient in improving disturbance rejection performance, while retaining tracking performance comparable with the original MO method.