基于多目标粒子群算法的混合流水车间调度方法研究

混合流水车间调度问题HFSP是一种具有很强应用背景的生产调度问题。本文给出了一种HFSP多目标调度模型,提出了一种针对该类问题的多目标粒子群算法。该算法采用基于Pareto支配关系的极值更新策略;采取对自适应惯性权重递减和对种群变异的方法以保持种群多样性;设置Pareto解池保存计算中出现的Pareto最优解,并提出了一种基于适应度拥挤度的聚类算法优化解的分布特性。实验结果表明,本文算法是求解HFSP问题的一种有效方法。     

基于改进多目标遗传算法求解混合流水车间调度问题

为解决混合流水车间调度问题(HFSP),基于多目标遗传算法和粒子群算法的优点,提出一种多目标混合算法。该算法引入一种扩展的基于工序的编码,将两种算法产生的最优解分别作为彼此的初始因子,增强了遗传算法的进化速度,有效避免了粒子群算法陷入局部最优,并实现了不同加工路线的生产车间的灵活性调度。最后通过实例的数值仿真验证了算法的有效性。     

基于NSGA2算法的混合流水车间多目标调度问题研究

针对混合流水车间多目标调度问题,以最大流程时间和生产中所消耗的总能量最小为目标函数,建立了混合整数数学规划模型;将具有解决复杂组合优化问题的非劣排序遗传算法2(NSGA2)应用于求解多目标混合流水车间调度问题,详细描述了NSGA2算法求解HFSP问题的步骤。利用Matlab仿真,结果表明,NSGA2算法求解多目标HFMSP问题可行性和有效性。     

基于强化协同算法的多目标生产调度模型研究

针对流程工业生产调度具有复杂性、多约束性和多目标性难以优化的特点,提出了一种新型强化协同优化算法 (N C O ),并将该算法应用于求解多目标优化问题,提出了基于N C O 算法的多目标协同优化方法(M O N C O )。研究表明, M O N C O 算法应用于车间调度问题,不仅可以优化生产工序,还能减少迭代次数,提高计算效率。     

基于免疫克隆选择算法的混合流水车间调度问题的研究

本文针对混合流水车间调度问题,以最大流程时间最小为目标函数,建立了混合整数数学规划模型;将具有解决复杂组合优化问题的免疫克隆选择算法（ICA）应用于求解混合流水车间调度问题,详细描述了ICA算法求解HFSP问题的步骤;为了验证算法的有效性,仿真对比了遗传算法和ICA算法的性能,与文献结果比较,结果表明ICA算法求解HFSP问题可行性和有效性。     

一种不确定条件下的多目标流水车间调度优化算法

实际中大多数生产调度问题具有多目标优化的性质,本文讨论在不确定加工时间和机器故障的情况下.如何优化多目标流水车间调度问题.首先设计最大流程时间和最大延迟时间两类指标的求解方法,在此基础上提出一种多目标遗传算法,用来迭代求解不确定条件下两类目标的最优化问题.模拟实验的结果表明,本文算法方案可较好解决不确定条件下的流水车间调度问题.     

云环境中基于分解的多目标工作流调度算法

云服务提供商在给用户提供海量虚拟资源的同时,也面临着一个现实的问题,即怎样调度这些资源,以最小的代价(完工时间、执行费用、资源利用率等)完成工作流的执行。针对IaaS环境下的工作流调度问题,以完工时间和执行费用作为目标,提出了一种基于分解的多目标工作流调度算法。该算法结合了基于列表的启发式算法和多目标进化算法的选择过程,采用一种分解方法,将多目标优化问题分解为一组单目标优化子问题,然后同时求解这些单目标子问题,使得调度过程更为简单有效。算法利用天马项目发布的现实世界中的工作流进行实验,结果表明,和MOHEFT算法以及NSGA-II*算法相比较,所提出的算法能得到更优的Pareto解集,同时具有更低的时间复杂度。     

改进GWO算法求解柔性钣金车间动态重调度问题

根据钣金生产线特点建立了具有工件优先级约束的多目标柔性作业车间动态调度模型,并提出改进的多目标灰狼优化算法用于求解该模型。首先,针对该模型设计出一种同时满足工件优先级约束、工序优先级约束和设备加工约束条件的剪枝式解码方案;其次,提出一种非线性收敛因子和动态位置更新策略,用于平衡经典灰狼优化算法的探索能力和利用能力;最后,为减少设备故障对原始调度方案的影响,设计了一种动态重调度策略。通过实验验证了改进多目标灰狼优化算法求解钣金车间动态调度问题的有效性和动态重调度策略的可行性。     

基于人工免疫算法的多目标函数优化

提出了一种新型的人工免疫算法用来解决多目标函数优化问题。基于自然免疫系统固有的优良特性对算法进行了设计和分析。最后,算法对3个较复杂的多目标问题进行了优化,优化结果能很好地覆盖问题的Paret。最优面,并且把算法与某些混合遗传算法进行了对比实验,表明人工免疫算法在解决多目标优化问题上具有可观的研究前景。     

成本时间限制下的网格分类调度算法研究

在网格环境中,由于资源广域分布、异构、动态且有多个管理域,调度一组具有多QoS需求如成本、时间的独立任务是一个非常重要的问题。针对网格任务的成本和执行时间要求,提出了一种基于网格经济模型,根据实际执行成本和预算成本进行分类的网格分类优化调度算法。模拟实际网格任务调度实验表明,该算法能很好地满足网格环境中不同用户的需求。     

A NEW HYBRID ALGORITHM FOR MULTI-OBJECTIVE DISTRIBUTION FEEDER RECONFIGURATION

This article proposes an efficient hybrid algorithm for multi-objective distribution feeder reconfiguration. The hybrid algorithm is based on the combination of discrete particle swarm optimization (DPSO), ant colony optimization (ACO), and fuzzy multi-objective approach called DPSO-ACO-F. The objective functions are to reduce real power losses, deviation of nodes voltage, the number of switching operations, and the balancing of the loads on the feeders. Since the objectives are not the same, it is not easy to solve the problem by traditional approaches that optimize a single objective. In the proposed algorithm, the objective functions are first modeled with fuzzy sets to calculate their imprecise nature and then the hybrid evolutionary algorithm is applied to determine the optimal solution. The feasibility of the proposed optimization algorithm is demonstrated and compared with the solutions obtained by other approaches over different distribution test systems.     

混合流水车间提前/拖期调度问题的DE优化解

针对JIT生产模式下的混合流水车间调度问题特点,提出了采用DE算法与指派规则联合调度策略求解流水车间提前/拖期调度问题。构建了混合流水车间的提前/拖期调度模型。详细论述了DE算法的实施流程和关键问题。在算法实施过程中,首先,采用DE算法进行全局寻优,完成生产任务指派,确定某个工件在某个工序在哪个工位加工;然后采用局部指派规则来确定工件在该工序的开工时间。在满足目标完成时间(交货期)的前提下,使提前惩罚费用与拖期惩罚费用之和最小。数值计算结果证明了该算法的有效性。     

An effective hybrid particle swarm optimization algorithm for multi-objective flexible job-shop scheduling problem

Flexible job-shop scheduling problem (FJSP) is an extension of the classical job-shop scheduling problem. Although the traditional optimization algorithms could obtain preferable results in solving the mono-objective FJSP. However, they are very difficult to solve multi-objective FJSP very well. In this paper, a particle swarm optimization (PSO) algorithm and a tabu search (TS) algorithm are combined to solve the multi-objective FJSP with several conflicting and incommensurable objectives. PSO which integrates local search and global search scheme possesses high search efficiency. And, TS is a meta-heuristic which is designed for finding a near optimal solution of combinatorial optimization problems. Through reasonably hybridizing the two optimization algorithms, an effective hybrid approach for the multi-objective FJSP has been proposed. The computational results have proved that the proposed hybrid algorithm is an efficient and effective approach to solve the multi-objective FJSP, especially for the problems on a large scale.     

Hybridizing a multi-objective simulated annealing algorithm with a multi-objective evolutionary algorithm to solve a multi-objective project scheduling problem

In this paper, a multi-objective project scheduling problem is addressed. This problem considers two conflicting, priority optimization objectives for project managers. One of these objectives is to minimize the project makespan. The other objective is to assign the most effective set of human resources to each project activity. To solve the problem, a multi-objective hybrid search and optimization algorithm is proposed. This algorithm is composed by a multi-objective simulated annealing algorithm and a multi-objective evolutionary algorithm. The multi-objective simulated annealing algorithm is integrated into the multi-objective evolutionary algorithm to improve the performance of the evolutionary-based search. To achieve this, the behavior of the multi-objective simulated annealing algorithm is self-adaptive to either an exploitation process or an exploration process depending on the state of the evolutionary-based search. The multi-objective hybrid algorithm generates a number of near non-dominated solutions so as to provide solutions with different trade-offs between the optimization objectives to project managers. The performance of the multi-objective hybrid algorithm is evaluated on nine different instance sets, and is compared with that of the only multi-objective algorithm previously proposed in the literature for solving the addressed problem. The performance comparison shows that the multi-objective hybrid algorithm significantly outperforms the previous multi-objective algorithm.     

An effective L-MONG algorithm for solving multi-objective flow-shop inverse scheduling problems

Generally, in handling traditional scheduling problems, ideal manufacturing system environments are assumed before determining effective scheduling. Unfortunately, “ideal environments” are not always possible. Real systems often encounter some uncertainties which will change the status of manufacturing systems. These may cause the original schedule to no longer to be optimal or even feasible. Traditional scheduling methods are not effective in coping with these cases. Therefore, a new scheduling strategy called “inverse scheduling” has been proposed to handle these problems. To the best of our knowledge, this research is the first to provide a comprehensive mathematical model for multi-objective permutation flow-shop inverse scheduling problem (PFISP). In this paper, first, a PFISP mathematical model is devised and an effective hybrid multi-objective evolutionary algorithm is proposed to handle uncertain processing parameters (uncertainties) and multiple objectives at the same time. In the proposed algorithm, we take an insert method NEH-based (Nawaz–Enscore–Ham) as a local improving procedure and propose several adaptations including efficient initialization, decimal system encoding, elitism and population diversity. Finally, 119 public problem instances with different scales and statistical performance comparisons are provided for the proposed algorithm. The results show that the proposed algorithm performs better than the traditional multi-objective evolution algorithm (MOEA) in terms of searching quality, diversity level and efficiency. This paper is the first to propose a mathematical model and develop a hybrid MOEA algorithm to solve PFISP in inverse scheduling domain.     

求解随机机会约束规划的混合智能算法及应用

为更有效地求解随机机会约束规划问题,提出一种基于克隆选择算法(CSA)、随机模拟技术及神经网络的混合智能算法。采用随机模拟技术产生随机变量样本矩阵训练反向传播(BP)网络以逼近不确定函数,之后在CSA中利用神经网络检验个体的可行性、计算适应度,从而得到优化问题的最优解。为保证算法搜索的快速性和有效性,CSA采用双克隆和双变异策略。仿真结果表明,与已有算法相比,混合智能算法在500代时已取得比较满意的结果,且其精度在单目标优化问题中提高了2.2%,在多目标优化问题中提高了65%;将该算法应用于求解水库优化调度的难题上,结果也表明所建立的模型及算法的可行性和有效性。     

Multi-objective optimization with fuzzy measures and its application to flow-shop scheduling

Most of the research in multi-objective scheduling optimization uses the classical weighted arithmetic mean operator to aggregate the various optimization criteria. However, there are scheduling problems where criteria are considered interact and thus a different operator should be adopted. This paper is devoted to the search of Pareto-optimal solutions in a tri-criterion flow-shop scheduling problem (FSSP) considering the interactions among the objectives. A new hybrid meta-heuristic is proposed to solve the problem which combines a genetic algorithm (GA) for solutions evolution and a reduced variable neighborhood search (RVNS) technique for fast solution improvement. To deal with the interactions among the three criteria the discrete Choquet integral method is adopted as a means to aggregate the criteria in the fitness function of each individual solution. Experimental comparisons (over public available FSSP test instances) with five existing multi-objective evolutionary algorithms (including the well known SPEA2 and NSGAII algorithms as well as the recently published L-NSGA algorithm) showed a superior performance for the developed approach in terms of diversity and domination of solutions.     

基于混合人工蜂群算法的多目标柔性作业车间调度问题研究

传统的优化算法在求解面对多目标柔性作业车间调度时,往往求解效率低且难以获得最优解。为了求解多目标柔性作业车间调度问题,设计了混合人工蜂群算法。种群的初始化采用了多种方法相结合的策略。在人工蜂群算法的不同阶段采用不同的搜索机制,在雇佣蜂阶段采用开发搜索,针对跟随蜂阶段蜜蜂跟随的对象的优秀解进行小幅度的更新,从而提高了搜索的表现。禁忌搜索与改进的人工蜂群算法相结合,有效的提升了获得最优解的概率。通过相关文献中的标准实例对设计的混合人工蜂群算法进行一系列求解测试,实验的结果有效的说明了算法在求解柔性作业车间调度问题时效果显著。通过求解结果对比表明人工蜂群算法的高效性和优越性。     

嵌入疲劳效应和学习效应的应急手术调度研究

为了解决突发事件下应急手术调度问题,将应急手术调度问题看作混合流水车间调度问题,并考虑了医护人员长时间工作而带来的疲劳效应和截断学习效应,构建了术前、术中、术后三阶段手术调度模型。利用改进的灰狼优化算法对三阶段应急手术调度模型进行求解,并通过仿真实验测试模型和算法的有效性。算例分析中,将改进的灰狼优化算法和传统的灰狼优化算法的算例结果进行对比,结果表明改进的灰狼优化算法更有效,能得到更好的调度结果。