Sequential approximation optimization assisted particle swarm optimization for expensive problems

In this paper, an efficient sequential approximation optimization assisted particle swarm optimization algorithm is proposed for optimization of expensive problems. This algorithm makes a good balance between the search ability of particle swarm optimization and sequential approximation optimization. Specifically, the proposed algorithm uses the optima obtained by sequential approximation optimization in local regions to replace the personal historical best particles and then runs the basic particle swarm optimization procedures. Compared with particle swarm optimization, the proposed algorithm is more efficient because the optima provided by sequential approximation optimization can direct swarm particles to search in a more accurate way. In addition, a space partition strategy is proposed to constraint sequential approximation optimization in local regions. This strategy can enhance the swarm diversity and prevent the preconvergence of the proposed algorithm. In order to validate the proposed algorithm, a lot of numerical benchmark problems are tested. An overall comparison between the proposed algorithm and several other optimization algorithms has been made. Finally, the proposed algorithm is applied to an optimal design of bearings in an all-direction propeller. The results show that the proposed algorithm is efficient and promising for optimization of the expensive problems.     

含区间参数多目标系统的微粒群优化算法

参数不确定优化问题是实践中经常遇到的复杂优化问题, 现有方法多针对单目标函数的情况. 本文利用微粒群优化算法解决含区间参数多目标优化问题, 提出一种基于概率支配的多目标微粒群优化算法. 该算法通过定义概率支配关系, 比较所得解的优劣; 基于 σ 区间值, 选择微粒的全局极值点, 并给出新的微粒个体极值点及外部储备集的更新策略. 与传统多目标微粒群优化算法比较, 仿真结果表明本文所提算法的有效性.     

基于大数据的智能电网状态远程监测方法

智能电网作为一种智能化电力传输载体,在电力供应环节发挥了重要作用,因此保证其正常运行具有重要的现实意义。当前智能电网状态远程监测多与智能算法相结合,通过智能算法完成状态评估,常见的智能算法有神经网络、决策树以及支持向量机等,但这三种算法应用下,空间复杂度与时间复杂度较大。针对上述问题,提出一种基于大数据的自适应免疫粒子群算法智能电网状态远程监测方法。方法首先利用量测工具对智能电网状态信息量进行采集,然后对采集到的信息量进行处理,包括数据清洗、数据去噪、数据消减、数据标准化,最后利用自适应免疫粒子群算法实现智能电网健康状况评估。结果表明:与神经网络、决策树以及支持向量机三种算法相比,自适应免疫粒子群算法运行下,产生的空间复杂度与时间复杂度最小,分别为247.7 byte和154 s。     

Airfoil shape optimization using improved Multiobjective Territorial Particle Swarm algorithm with the objective of improving stall characteristics

In this paper, a new robust optimization technique with the ability of solving multi-objective constrained design optimization problems in aerodynamics is presented. This new technique is Multi-objective Territorial Particle Swarm Optimization (MOTPSO) algorithm in which diversity is actively preserved by avoiding overcrowded clusters of particles and encouraging broader exploration. Adaptively varying “territories” are formed around promising individuals to prevent many of the lesser individuals from premature clustering and encouraged them to explore new neighborhoods based on a hybrid self-social metric. Also, a new social interaction scheme is introduced which guided particles towards the weighted average of their “elite” neighbors’ best found positions instead of their own personal bests which in turn helps the particles to exploit the candidate local optima more effectively. The MOTPSO algorithm takes into account multiple objective functions using a Pareto-Based approach. The non-dominated solutions found by swarm are stored in an external archive and nearest neighbor density estimator method is used to select a leader for the individual particles in the swarm. Efficiency and robustness of the proposed algorithm is demonstrated using multiple traditional and newly-composed optimization benchmark functions and aerodynamic design problems. In final airfoil designs obtained from the Multi Objective Territorial Particle Swarm Optimization algorithm, separation point is delayed to make the airfoil less susceptible to stall in critical operating conditions and it also reveal an evident improvement over the test case airfoil across all objective functions presented.     

基于混合粒子群算法的梯级泵站优化调度

针对大型梯级泵站工况复杂多变、安全性要求高的运行特点,基于流量平衡的理论,建立梯级泵站运行费用最小的优化目标,同时把系统一次运行周期内泵站机组的启停次数作为衡量维护费用的指标,建立泵站启停次数最小的优化模型,运用线性加权法将两个优化目标组合成一个泵站系统综合运行费用最少的优化调度模型,最终运用动态规划法和粒子群算法进行研究分析,并尝试采用免疫思想通过克隆免疫算子和疫苗接种算子优化粒子群算法,达到提高搜索范围和精度的目的。将其应用于山西某梯级泵站工程实例,仿真研究分析表明免疫粒子群算法(IAPSO)在优化泵站系统综合运行费用上更加节省成本而且提高了搜索精度和收敛速度。     

多种群并行协作的粒子群算法

针对高维复杂优化问题在求解时容易产生维数灾难导致算法极易陷入局部最优的问题,提出一种能够综合考虑高维复杂优化问题的特性,动态调整进化策略的多种群并行协作的粒子群算法。该算法在分析高维复杂问题求解过程中的粒子特点的基础上,建立融合环形拓扑、全连接形拓扑和冯诺依曼拓扑结构的粒子群算法的多种群并行协作的网络模型。该模型结合3种拓扑结构的粒子群算法在解决高维复杂优化问题时的优点,设计一种基于多群落粒子广播-反馈的动态进化策略及其进化算法,实现高维复杂优化环境中拓扑的动态适应,使算法在求解高维单峰函数和多峰函数时均具有较强的搜索能力。仿真结果表明,该算法在求解高维复杂优化问题的寻优精度和收敛速度方面均有良好的性能。     

基于进化能力的多策略粒子群优化算法

针对粒子群优化算法易早熟收敛、求解精度低等缺点，提出基于进化能力的多策略粒子群优化算法（multistrategy particle swarm optimization algorithm based on evolution ability）。将粒子按照适应值变化方向分为进步粒子和停退粒子。对于进步粒子按照原始进化策略更新，保留原算法的优点。对于停退粒子进一步根据粒子活性分为暂时停退粒子和长久停退粒子，针对暂时停退的粒子，减小对个体历史速度的依赖甚至向相反方向学习，针对长久停退粒子，根据粒子的适应值优劣采用不同的进化策略，提高全局寻优能力。同时，设计一种带随机波动的惯性权重，使粒子在算法后期仍然具有跳出当前区域的能力，利于全局搜索。通过与其他算法在10个测试函数不同维度上的优化结果对比表明，该算法无论对低维还是高维问题求解的收敛速度和求解精度均有优势。将EAMSPSO算法应用于半无限规划问题的求解，实验结果表明，该算法可以用于半无限规划问题的求解，且具有优势。     

基于改进量子粒子群算法的Nash均衡研究

在N人非合作博弈Nash均衡问题求解过程中,将量子不确定性原理、协同演化以及免疫算法内的抗体浓度抑制机制引进到经典粒子群算法中,设计了一种新型改进量子粒子群算法来更好地处理Nash均衡问题。该算法在运算过程中,运用抗体浓度以及协同演化的方式来维系粒子群具备的多样性特征,并借助量子不确定性缩减迭代搜索耗时。该算法不仅有效地将粒子群算法运算简单与方便实现的特质承继下来,而且算法的收敛速度以及其全局搜索能力都获得了大幅度的提升。相关数值算例分析表明,改进的算法能够更好地处理粒子早熟,相较遗传算法以及免疫粒子群算法更具性能优越性。     

独立自适应调整参数的粒子群优化算法

针对传统粒子群优化算法在求解复杂优化问题时易陷入局部最优和依赖参数的取值等问题,提出了一种独立自适应参数调整的粒子群优化算法。算法重新定义了粒子进化能力、种群进化能力以及进化率,在此基础上给出了粒子群惯性权重及学习因子的独立调整策略,更好地平衡了算法局部搜索与全局搜索的能力。为保持种群多样性,提高粒子向全局最优位置的收敛速度,在算法迭代过程中,采用粒子重构策略使种群中进化能力较弱的粒子向进化能力较强的粒子进行学习,重新构造生成新粒子。最后通过CEC2013中的10个基准测试函数与4种改进粒子群算法在不同维度下进行测试对比,实验结果验证了该算法在求解复杂函数时具有高效性,通过收敛性分析说明了算法的有效性。     

综合密度信息的矢量变异多目标粒子群优化

粒子群优化算法求解多目标优化问题存在早熟收敛和后期收敛速性差的不足,解的分布性也有待提高。为此设计一种新的多目标粒子群优化算法：对寻求粒子最优解的sigma方法进行改进,提出一种综合非支配解密度信息和sigma值的最优解求解机制。对变异粒子速度进行矢量扰动变异;对停滞粒子进行位置变异,有效避免算法的早熟收敛问题。测试结果表明,所提出的算法在收敛性和解的分布性、多样性方面较经典的算法具有明显的优势。     

基于参数方程处理等式约束优化的粒子群算法

针对目前已有的粒子群优化算法求解有等式约束优化问题时对收敛速度和解的精度的影响,提出了一种新的基于参数方程的粒子群优化算法.它是粒子群在初始化和选代进化过程中使用求解参数方程的方法处理等式约束设计出的粒子群优化算法.数值实验结果表明,新算法是有效的.它不仅提高了收敛速度和解的精度,而且是一种通用的智能算法.     

基于改进粒子群算法的PID控制器参数自整定

针对标准粒子群算法寻优精度不高、易出现早熟收敛等缺陷,提出一种自适应混沌移民变异粒子群算法IPSO。该算法通过引入基因距离来反映粒子间合作与竞争的隐性知识,使粒子种群的多样性得到量化,采取自适应混沌移民变异策略对陷入聚集区域的粒子进行处理,使之获得继续搜索的能力,从而防止算法过早陷入局部最优。仿真结果表明,IPSO算法在PID控制器参数寻优问题上具有遗传算法和标准粒子群算法无法比拟的优势。     

求解工程约束优化问题的PSO-ABC混合算法*

针对包含约束条件的工程优化问题,提出了基于人工蜂群的粒子群优化PSO-ABC算法。将PSO中较优的粒子作为ABC算法的蜜源,并使用禁忌表存储其局部极值,克服粒子群优化算法易陷入局部最优的缺陷。采用可行性规则进行约束处理,将粒子种群分为可行子群和不可行子群,并在ABC算法产生蜜源的过程中保留部分较优的可行解和不可行解的信息,弥补了可行性规则处理最优点位于约束边界附近的问题时存在的不足。四个典型工程优化设计的实验结果表明,该算法能够寻得更优的约束最优化解,且稳健性更强。     

拥挤距离排序的多目标文化粒子群优化算法

为解决工程优化设计问题,引入文化进化框架,提出一种拥挤距离排序的多目标文化粒子群算法.采用拥挤距离排序算子,并删除密集区域的多余粒子,以保证Pareto前沿的分布均匀性;基于拥挤距离值,从精英知识和条件知识中选择处于最分散区域的粒子,并将其分别作为全局和局部最优,以增强算法全局寻优能力;依据拥挤距离的变化,动态调整粒子群飞行参数,以提高算法收敛效率.通过标准测试问题以及与其他算法的对比,表明了所提出算法的有效性和鲁棒性.     

虚拟企业伙伴选择的遗传粒子群混合算法

针对标准粒子群优化算法易陷入局部最优的缺点,提出了一种遗传粒子群混合算法。通过对算法中惰性粒子和局部最优粒子分别进行交叉变异,以及消除粒子速度对寻优的干扰,从而避免了粒子种群单一化和局部最优的问题。将该算法应用于虚拟企业伙伴选择实验,结果表明在进化代数和最优值方面是令人满意的。     

Discrete optimum design of truss structures using artificial bee colony algorithm

Over the past few years, swarm intelligence based optimization techniques such as ant colony optimization and particle swarm optimization have received considerable attention from engineering researchers and practitioners. These algorithms have been used in the solution of various engineering problems. Recently, a relatively new swarm based optimization algorithm called the Artificial Bee Colony (ABC) algorithm has begun to attract interest from researchers to solve optimization problems. The aim of this study is to present an optimization algorithm based on the ABC algorithm for the discrete optimum design of truss structures. The ABC algorithm is a meta-heuristic optimization technique that mimics the process of food foraging of honeybees. Originally the ABC algorithm was developed for continuous function optimization problems. This paper describes the modifications made to the ABC algorithm in order to solve discrete optimization problems and to improve the algorithm’s performance. In order to demonstrate the effectiveness of the modified algorithm, four structural problems with up to 582 truss members and 29 design variables were solved and the results were compared with those obtained using other well-known meta-heuristic search techniques. The results demonstrate that the ABC algorithm is very effective and robust for the discrete optimization designs of truss structural problems.     

多策略融合的改进粒子群优化算法

为解决传统粒子群算法收敛精度低、收敛速度慢和易陷入局部最优的问题,提出了一种多策略融合的改进粒子群算法。首先,设计了一种基于中垂线算法的游离粒子位置更新方法,加快了游离粒子的收敛速度;其次,设计了一种在最优粒子附近生成爆炸粒子的策略,以增强算法的寻优精度和寻优速度,为适应前两个策略,设计了一种仅依靠全局最优粒子位置的粒子速度更新策略;最后,将基于概率分层的简化粒子群优化算法的惯性权重和粒子位置更新方法用于本算法。与其他五种改进粒子群算法进行了对比实验,结果表明提出的改进算法无论是处理低维问题还是高维问题表现均具有较大优势,性能更优越。     

A parallel boundary search particle swarm optimization algorithm for constrained optimization problems

During the past decade, considerable research has been conducted on constrained optimization problems (COPs) which are frequently encountered in practical engineering applications. By introducing resource limitations as constraints, the optimal solutions in COPs are generally located on boundaries of feasible design space, which leads to search difficulties when applying conventional optimization algorithms, especially for complex constraint problems. Even though penalty function method has been frequently used for handling the constraints, the adjustment of control parameters is often complicated and involves a trial-and-error approach. To overcome these difficulties, a modified particle swarm optimization (PSO) algorithm named parallel boundary search particle swarm optimization (PBSPSO) algorithm is proposed in this paper. Modified constrained PSO algorithm is adopted to conduct global search in one branch while Subset Constrained Boundary Narrower (SCBN) function and sequential quadratic programming (SQP) are applied to perform local boundary search in another branch. A cooperative mechanism of the two branches has been built in which locations of the particles near boundaries of constraints are selected as initial positions of local boundary search and the solutions of local boundary search will lead the global search direction to boundaries of active constraints. The cooperation behavior of the two branches effectively reinforces the optimization capability of the PSO algorithm. The optimization performance of PBSPSO algorithm is illustrated through 13 CEC06 test functions and 5 common engineering problems. The results are compared with other state-of-the-art algorithms and it is shown that the proposed algorithm possesses a competitive global search capability and is effective for constrained optimization problems in engineering applications.     

带偏向性轮盘赌的多算子协同粒子群优化算法

针对粒子群优化算法在处理高维、大规模、多变量耦合、多模态、多极值属性优化问题时易早熟收敛等性能和技术瓶颈,基于粒子群优化算法行为学习算子和3种不同学习偏好的差分变异算子,建立带偏向性轮盘赌的多算子选择与融合机制,提出一种带偏向性轮盘赌的多算子协同粒子群优化算法MOCPSO.MOCPSO针对迭代粒子群榜样粒子集,首先通过对迭代种群及其榜样粒子集优劣分组,同时采用轮盘赌分别为每组榜样粒子集选配不同学习偏好的变异算子,并为每组榜样粒子适配差分基向量和最优基向量,预学习并优化迭代种群及其榜样粒子,以权衡算法的全局探索和局部开发;然后通过合并所有子种群,并结合粒子群优化算法行为学习算子,指导迭代种群状态更新,以提高算法的全局收敛性;最后结合精英学习策略,对群体历史最优进行高斯扰动,以提高算法的局部逃生能力,保障算法收敛的多样性.实验结果表明,MOCPSO算法与5种先进的同类型群智能算法在求解CEC2014基准测试问题上具备竞争力,且有更强的优化特性.     

一种含驻留粒子的改进粒子群算法

为了避免粒子群算法过早收敛,提出一种包含局部驻留粒子的改进粒子群算法（CRPSO）。该算法将基本的粒子群算法的粒子称为主粒子,而当算法每找到一个新的全体最优点之后,将会在这个最优点附近产生几个称为驻留粒子的搜索粒子。2种粒子分工协作,主粒子负责全局搜索而驻留粒子负责局部搜索。驻留粒子帮助主粒子群避免过早收敛,提高整个粒子群多样性。仿真结果表明,该算法能有效地改善粒子群算法在非线性全局优化问题上的早熟现象,增强粒子群算法的全局搜索能力。