改进粒子群的模糊神经PID控制研究与应用

设计一款电子负载用于对稳压电源进行检测。在硬件方面,对DSP控制器的选择、电子负载各芯片的选取、键盘及显示电路的设计进行了详细的介绍;在软件方面,针对模糊神经PID控制算法易陷入局部极值和迭代过久的缺点,加入了改进的粒子群算法,并且在神经网络在线调整时加入训练参数,对算法进行了改进,提高了算法的效率。将设计好的电子负载对稳压电源源效应进行检测,取得了较好的结果。     

基于包含度的区间二型模糊粗糙集

基于区间二型模糊包含度的公理化定义,给出了新的区间二型模糊包含度计算公式.进一步,通过包含度定义了区间二型模糊粗糙集,并讨论了它的一些基本性质.最后,利用区间二型模糊粗糙集研究了连续域决策信息系统的属性约简,给出了新的约简方法.实例说明了该约简方法的具体计算步骤,并且通过实验验证了该算法的有效性和可行性.     

基于区间二型模糊集合的语言动力系统稳定性

运用区间二型模糊集合(Interval type-2 fuzzy sets, IT2 FSs) 的扩展原理将常规的数值函数转化为对应的区间二型模糊函数, 并给出了相应的词计算(Computing with words, CW)方法与算法,最后分析了严格单调情况下基于区间二型模糊集合的单输入单输出系统的语言动力系统(Linguistic dynamic systems, LDS)稳定性.     

基于改进粒子群算法的PID参数优化方法研究

针对标准粒子群算法的一些缺点进行了改进，提出了MWPSO优化算法，即Multi-Weight PSO。将MWPSO优化算法用几个标准测试函数进行测试，结果表明该算法优化结果的指标参数比标准PSO算法有所提高。在此基础上，用MWPSO优化算法对PID控制中的参数进行优化并将结果与遗传算法的结果进行比较，优化结果在保证PID控制稳定性基础上提高了PID控制的精度，且编码简单、易于实现。具有较好的应用前景。     

区间二型模糊集和模糊系统: 综述与展望

一型模糊集可以建模单个用户的语义概念中的不确定性, 即个体内不确定性. 一型模糊系统在控制和机器学习中得到了大量成功应用. 区间二型模糊集能同时建模个体内不确定性和个体间不确定性, 因而在很多应用中显示了比一型模糊系统更好的性能, 是近年来的研究热点. 本文首先介绍了区间二型模糊集的重要概念和理论研究进展, 总结了其在决策和机器学习中的成功应用, 然后介绍了区间二型模糊系统的基本操作和理论研究进展, 并回顾了其在控制和机器学习中的典型应用. 最后, 对区间二型模糊集和模糊系统未来的研究方向进行了展望.     

A Novel Green Supplier Selection Method Based on the Interval Type-2 Fuzzy Prioritized Choquet Bonferroni Means

In view of the environment competencies, selecting the optimal green supplier is one of the crucial issues for enterprises, and multi-criteria decision-making (...     

PSO随机数参数设置的多目标定位方法研究

为了解决林业部门对森林防火安全监测系统中对多个声音目标的跟踪及定位问题,根据声音能量随距离衰减模型,提出了采用粒子群算法(PSO)的多目标定位与优化方法.通过利用极大似然法对声音强度模型的定位算法,采用惯性权重的粒子群算法,着重讨论了随机参数不同的设置方法对定位追踪精度性能的影响.通过仿真实验证明,粒子群算法中设置随机数参数为常数,可以有效提高目标定位精度,并减小搜索复杂度.     

基于混合粒子群算法的RBF神经网络参数优化

针对径向基函数（RBF）神经网络中心参数的优化问题,提出了一种混合粒子群优化算法。该算法应用灰色关联理论定义了粒子群的灰色相似度,分两个阶段对标准的粒子群优化算法（PSO）的全局和局部搜索能力做了改进和提高。在仿真实验中,应用该方法对典型的Mackey-Glass混沌时间序列进行了预测。并与标准的K均值算法、遗传算法和粒子群算法进行了比较,其结果表明,所预测的各项误差均低于其他常规算法的预测结果。     

Forecasting of Software Reliability Using Neighborhood Fuzzy Particle Swarm Optimization Based Novel Neural Network

This paper proposes an artificial neural network (ANN) based software reliability model trained by novel particle swarm optimization (PSO) algorithm for enhanced forecasting of the reliability of software. The proposed ANN is developed considering the fault generation phenomenon during software testing with the fault complexity of different levels. We demonstrate the proposed model considering three types of faults residing in the software. We propose a neighborhood based fuzzy PSO algorithm for competent learning of the proposed ANN using software failure data. Fitting and prediction performances of the neighborhood fuzzy PSO based proposed neural network model are compared with the standard PSO based proposed neural network model and existing ANN based software reliability models in the literature through three real software failure data sets. We also compare the performance of the proposed PSO algorithm with the standard PSO algorithm through learning of the proposed ANN. Statistical analysis shows that the neighborhood fuzzy PSO based proposed neural network model has comparatively better fitting and predictive ability than the standard PSO based proposed neural network model and other ANN based software reliability models. Faster release of software is achievable by applying the proposed PSO based neural network model during the testing period.      

广义区间二型模糊集合的词计算

普通的模糊集合是点值为二维的一型模糊集合,二型模糊集合(Type-2 fuzzy sets, T2 FS)是点值为三维的模糊集合, T2 FS比相应的一型难以理解和计算. 为了让人们更好地理解T2 FS并推广其应用, 本文提出了广义区间二型模糊集合(Generalized interval type-2 fuzzy sets, GIT2 FS)的定义, 并将其分成三类:离散型、半离散型及连续型,分别给出相应的数学表达式与扩展原理公式,并得到了GIT2 FS在两种不同的模糊逻辑算子下的词计算.     

PSO算法在非线性模型参数估计中的应用

将微粒群优化(PSO)算法用于非线性系统模型参数估计，并通过对谷氨酸菌体生长模型的参数估计进行了验证．实验结果表明：微粒群算法为非线性系统模型参数估计提供了一种有效的途径．     

基于模糊网络和粒子群优化的油田指标预测

针对油田开发指标预测问题,提出一种模糊神经网络模型,该模型包括输入层、模糊化层、规则层和输出层。模糊化层采用高斯隶属函数,规则层每个节点对应一条模糊逻辑规则。网络可调参数为模糊集参数和输出层权值。提出了基于改进量子粒子群优化的网络训练方法。以油田开发指标中含水率预测为例,结果表明该方法是有效的可行的。     

Traffic Flow Data Forecasting Based on Interval Type-2 Fuzzy Sets Theory

This paper proposes a long-term forecasting scheme and implementation method based on the interval type-2 fuzzy sets theory for traffic flow data. The type-2 fuzzy sets have advantages in modeling uncertainties because their membership functions are fuzzy. The scheme includes traffic flow data preprocessing module, type-2 fuzzification operation module and long-term traffic flow data forecasting output module, in which the Interval Approach acts as the core algorithm. The central limit theorem is adopted to convert point data of mass traffic flow in some time range into interval data of the same time range (also called confidence interval data) which is being used as the input of interval approach. The confidence interval data retain the uncertainty and randomness of traffic flow, meanwhile reduce the influence of noise from the detection data. The proposed scheme gets not only the traffic flow forecasting result but also can show the possible range of traffic flow variation with high precision using upper and lower limit forecasting result. The effectiveness of the proposed scheme is verified using the actual sample application.      

基于严格等价函数的区间二型模糊熵及其图像阈值分割方法

文中利用严格等价函数提出一种基于区间二型模糊熵的图像阈值分割方法.首先基于公理化定义,利用严格定价函数提出一种区间二型模糊熵的构建方法,由此可以得到多个不同的模糊熵计算表达式;然后通过理论分析给出了利用最小化模糊熵准则选取最优阈值的方法.实验结果表明,与现有的其他模糊阈值分割法和改进的2维Otsu法等相比,该方法的分割更加准确,运行时间更少,具有更广泛的适应性.     

Linguistic Dynamic Modeling and Analysis of Psychological Health State Using Interval Type-2 Fuzzy Sets

The study of psychological health state is helpful to build appropriate models and take effective intervention strategies, and the results benefit the intervened released from psychological distress within the shortest possible time. In this paper, interval type-2 fuzzy sets and fuzzy comprehension evaluation are applied in the analysis of mental health status and crisis intervention. A closed-loop linguistic dynamic intervention model for psychological health state is built. Linguistic dynamic systems based on interval type-2 fuzzy sets are used to describe and analyze the evolutionary process of psychological health status.      

基于PSO的模糊控制器参数优化设计

本文提出了将微粒群优化(PSO)算法应用于模糊控制器的参数优化设计中,针对常用的工业对象模型进行了仿真实验,仿真结果表明基于微粒群算法优化模糊控制器参数可以获得满意的控制效果,PSO算法为模糊控制器的设计提供了一种的新的思路.     

水下机器人参数辨识的量子粒子群算法

水下机器人动力学模型参数辨识是水下机器人运动状态控制、路径跟踪、状态监测、故障诊断及容错系统开发的基础,是水下机器人研究的核心内容之一.针对Falcon开架缆控水下机器人的动力学模型,将量子粒子群优化算法引入到水下机器人动力学模型参数辨识之中,提出基于量子粒子群优化算法(Quantum-behaved PSO,QPSO)的水下机器人动力学模型参数辨识,并将其辨识结果与粒子群优化算法(Particle Swarm Optimization,PSO)及遗传算法(GA)的辨识结果进行比较.仿真结果表明应用QPSO算法的参数辨识结果明显优于其它对比方法,说明了算法的有效性与合理性.     

一种基于类覆盖和粒子群优化的模糊神经网络系统

提出一种基于类覆盖获取有向图和粒子群优化方法的模糊神经网络模式识别系统模型,该模型利用改进的贪心算法获得半径较均匀的超球体类覆盖,再利用超球体类覆盖实现模糊输入空间划分和模糊IF-THEN规则提取,以此实现模糊神经网络系统的结构辨识;采用改进的模糊加权型Mamdani推理法确定系统的输出,并使用基于粒子群优化的算法对系统参数进行精炼,使系统具有很好的强壮性和识别率．对11种矿泉水味觉信号的识别实验结果证明了该系统的可行性和有效性．     

一种基于自适应模糊支配的高维多目标粒子群算法

高维多目标优化问题由于具有巨大的目标空间使得一些经典的多目标优化算法面临挑战.提出一种基于自适应模糊支配的高维多目标粒子群算法MAPSOAF,该算法定义了一种自适应的模糊支配关系,通过对模糊支配的阈值自适应变化若干步长,在加强个体间支配能力的同时实现对种群选择压力的精细化控制,以改善算法的收敛性;其次,通过从外部档案集中选取扰动粒子,并在粒子速度更新公式中新增一扰动项以克服粒子群早熟收敛并改善个体分布的均匀性;另外,算法利用简化的Harmonic归一化距离评估个体的密度,在改善种群分布性的同时降低算法的计算代价.该算法与另外五种高性能的多目标进化算法在标准测试函数集DTLZ{1,2,4,5}上进行对比实验,结果表明该算法在收敛性和多样性方面总体上具有较显著的性能优势.     

Interval Type-2 Fuzzy Hierarchical Adaptive Cruise Following-Control for Intelligent Vehicles

Intelligent vehicles can effectively improve traffic congestion and road traffic safety. Adaptive cruise following-control (ACFC) is a vital part of intelligent vehicles. In this paper, a new hierarchical vehicle-following control strategy is presented by synthesizing the variable time headway model, type-2 fuzzy control, feedforward + fuzzy proportion integration (PI) feedback (F+FPIF) control, and inverse longitudinal dynamics model of vehicles. Firstly, a traditional variable time headway model is improved considering the acceleration of the lead car. Secondly, an interval type-2 fuzzy logic controller (IT2 FLC) is designed for the upper structure of the ACFC system to simulate the driver’s operating habits. To reduce the nonlinear influence and improve the tracking accuracy for the desired acceleration, the control strategy of F+FPIF is given for the lower control structure. Thirdly, the lower control method proposed in this paper is compared with the fuzzy PI control and the traditional method (no lower controller for tracking desired acceleration) separately. Meanwhile, the proportion integration differentiation (PID), linear quadratic regulator (LQR), subsection function control (SFC) and type-1 fuzzy logic control (T1 FLC) are respectively compared with the IT2 FLC in control performance under different scenes. Finally, the simulation results show the effectiveness of IT2 FLC for the upper structure and F+FPIF control for the lower structure.