应用混合蚁群算法求解模糊作业车间调度问题

为解决蚁群算法求解时间过长和易陷入局部最优的问题,提出了一种求解模糊作业车间调度问题的混合算法,该算法将蚁群算法用于全局搜索.为了提高搜索效率,根据作业车间调度问题解的特征,提出一种基于关键工序的邻域搜索方法,并使用此邻域搜索方法的禁忌搜索算法嵌入蚁群算法.利用禁忌搜索算法较强的局部搜索能力,提高了蚁群算法的优化能力,改善了作业车间调度问题解的质量.实验结果验证了该混合搜索算法的有效性,其优化效果优于并行遗传算法和禁忌搜索算法.     

基于混合粒子群优化算法的置换流水车间调度问题研究

针对最大完工时间最小的置换流水车间调度问题,提出一种粒子群优化算法与变邻域搜索算法结合的混合粒子群优化（hybrid particle swarm optimization,HPSO）算法。在该混合算法中,采用NEH启发式算法进行种群初始化,以提高初始解质量。运用基于随机键的升序排列规则（ranked-or-der-value,ROV）,将连续PSO算法应用于离散置换流水车间调度问题中,提出了一种基于关键路径的变邻域搜索算法,以进一步提高算法的局部搜索能力,使算法在集中搜索和分散搜索之间达到合理的平衡。最后,运用提出的混合算法求解Taillard和Watson基准测试集,并将测试结果与一些代表算法进行比较,验证了该调度算法的有效性。     

置换流水车间调度粒子群优化与局部搜索方法研究

采用粒子群优化算法求解置换流水车间调度问题,提出了一种基于工件次序和粒子位置的二维粒子编码方法.为提高粒子群算法的优化性能,在描述了面向置换流水车间调度问题的粒子邻域结构后,提出了三种基于粒子邻域操作的局部搜索方法,分别是基于互换操作、基于插入操作和基于逆序操作的局部搜索方法.计算结果说明,粒子群算法的优化性能好于遗传算法和NEH启发式算法.三种局部搜索算法均能有效地提高粒子群算法的优化性能,采用基于互换操作局部搜索的粒子群算法的优化性能要好于其它两种局部搜索算法.     

列车调度问题模型与基于混合粒子群优化的求解算法

针对复线列车调度问题,建立了描述问题解空间的阻塞限制混合流水车间模型,并提出一种混合粒子群优化算法进行求解。该算法以最小化最长完工时间为目标,设计了释放-回推算法来安排列车运行顺序并计算最小化最长完工时间,利用改进的粒子群优化算法解决轨道分配问题并进行全局优化。此外,通过基于迭代邻域的搜索算法来提高种群的局部搜索能力。实验结果表明,所提出的方法能够有效地求解复线列车调度问题。     

混合蜂群算法求解柔性作业车间调度问题

为解决柔性作业车间调度问题,提出一种基于蜂群模型的混合群智能优化算法.在算法初始化阶段提出了蜂群优化算法结合随机方法的种群初始化方法,提高了初始种群质量;为提高算法搜索精度,在观察蜂阶段采用模拟退火算法更新观察蜂群,并以退温系数调节邻域规模,随算法进程细化搜索范围;针对柔性作业车间调度问题特点,建立了可控规模的邻域更新方法.采用柔性作业车间标准算例,通过仿真编程和与其他算法的比较,验证了算法的有效性和优越性.     

关于生产车间作业优化调度效率仿真研究

研究生产车间作业优化调度问题,使车间资源使用效率达到最优,由于车间作业调度目标的多样性,以及求解问题过程的复杂性和约束性,导致求解生产车间作业调度效率较低。为了克服作业车间调度问题解的大山谷结构,且提高生产车间作业调度效率,提出改进的粒子群遗传混合算法。本混合算法首先以最大完工时间最小化为目标,参考了模拟退火过程,提出以Metropolics准则定义自适应变异概率的思想,且在变异交叉操作中辅以改进的2变换邻域搜索,同时动态设置粒子群算法中的惯性权重值,改进的粒子群遗传混合算法具有新颖性的特点。结合3类6组经典作业车间调度问题的测试数据进行仿真实验,混合算法得到的解质量较普通的PSO和SA算法得到的解有较大提升,且与这6组经典问题的最优解的平均误差较小,同时计算时间有大幅提升。仿真结果进一步证明了该混合算法在求解生产车间作业调度问题上具有明显的优势,提高了调度效率。     

基于遗传变邻域混合算法的带交货期的单机车间逆调度方法

针对带交货期的单机逆调度问题,建立以最小化系统调整为目标函数的单机逆调度数学优化模型;利用互补性能,采用串行、并行和嵌入等结构,将遗传算法与变邻域搜索算法相结合,设计出遗传-变邻域搜索算法、遗传-变邻域搜索交替算法和遗传-变邻域搜索协同算法3种混合算法。为产生逆调度激发机制,采用非最优调度法,将随机初始化与局部初始化进行结合,创造逆调度环境;此外,为提高算法的局部搜索能力,基于交叉变异操作等思想来构建四种搜索邻域,通过邻域结构的切换,加强局部搜索能力;最后,将提出的混合算法用于求解不同规模的问题实例,与其他算法的求解结果进行比较,证明提出的混合算法是可行的和有效的。     

求解第Ⅰ类装配线平衡问题的离散粒子群优化算法

为求解具有NP难性质的第Ⅰ类装配线平衡问题,提出一类离散粒子群优化算法。该算法中所发展的排列数编码方法使得粒子解码后总满足装配作业间先后关系约束。针对排列数编码特点,提出一种基于位置交叉算子的粒子位置更新机制,确保了更新后粒子仍为排列数。为增强该算法的全局寻优能力,将简化变邻域搜索算法嵌入该算法中,对群体最佳粒子的邻域进行局部搜索,从而构建一种混合粒子群优化算法。通过将该算法和混合粒子群优化算法用于一系列测试算例并与遗传算法结果比较,验证了算法的有效性。计算结果对比表明,离散粒子群算法引入简化变邻域搜索可明显增强全局寻优能力,就综合解的质量和计算效率而言,混合粒子群优化算法优于现有遗传算法。     

求解无等待流水车间问题的若干算法

提出了解决无等待流水车间问题的离散粒子群优化、离散差异进化、变邻域搜索和阈值接收算法.在离散粒子群优化和离散差异进化中,采用基于工件排列的编码,设计了新的个体生成公式.同时研究了基于串行结构、嵌人结构和协同结构的12种混合算法.仿真计算表明,混合算法具有较高的优化性能.     

解决无等待流水车间调度问题的离散粒子群优化算法

针对以生产周期为目标的无等待流水车间调度问题,提出了一种离散粒子群优化算法.研究了无等待流水车间调度问题的快速邻域搜索技术,并将其分别用于加强粒子、个体极值或全体极值的邻域探索能力,得到了三种改进的离散粒子群优化算法.基于典型算例的试验,表明了上述算法的有效性.     

基于粒子群优化和模拟退火的混合调度算法

提出了一种离散粒子群调度算法，采用基于工序的编码方式及相应的位置和速度更新方法，使具有连续本质的粒子群算法直接适用于调度问题。针对粒子群算法容易陷入局部最优的缺陷，将其与模拟退火算法结合，得到了粒子群-模拟退火算法、改进的粒子群算法、粒子群-模拟退火交替算法以及粒子群-模拟退火协同算法等4种混合调度算法。仿真结果表明，混合算法均具有较高的求解质量。     

基于遗传-粒子群混合算法的柔性作业车间多资源调度问题

在传统柔性作业车间调度问题(FJSP)中加入运输和装配环节,提出一种柔性作业车间多资源调度问题(MRFJSP),以完工时间最短为目标建立了包含加工、运输和装配的柔性作业车间调度模型。为了提高传统遗传算法(GA)在车间调度问题中的寻优能力,将粒子群算法(PSO)的寻优过程进行改进并与遗传算法进行结合,提出一种带保优策略的遗传-粒子群混合算法,利用单层编码对模型进行求解。通过算例验证了模型的可行性,并将提出的混合算法与遗传算法和粒子群算法进行比较,证明了混合算法的优越性。     

Due window scheduling with sequence-dependent setup on parallel machines using three hybrid metaheuristic algorithms

Due-date determination problems have gained significant attention in recent years due to the industrial focus in the just-in-time philosophy. This paper considers a machine scheduling problem where jobs should be completed at times as close as possible to their respective due dates, and hence, both earliness and tardiness should be penalized. It is assumed that earliness and tardiness (ET) penalties will not occur if a job is completed within the due window. However, ET penalties will occur if a job is completed outside the due window. The objective is to determine a schedule that minimizes sum of the earliness and tardiness of jobs. To achieve this objective, three hybrid metaheuristics are proposed. The first metaheuristic is a hybrid algorithm which combines elements from both simulated annealing (SA) as constructive heuristic search and a variable neighborhood search (VNS) as local search improvement technique. The second one presents a hybrid metaheuristic algorithm which composed of a population generation method based on an ant colony optimization (ACO) and a VNS to improve the population. Finally, a hybrid metaheuristic approach is proposed which integrates several features from ACO, SA, and VNS in a new configurable scheduling algorithm. A design of experiments approach is employed to calibrate the parameters and operators of the algorithm. Computational experiments conducting on 252 randomly generated problems compare the results with the VNS algorithm proposed previously and show that the procedure is capable of producing consistently good results.     

A novel hybrid multi-objective shuffled frog-leaping algorithm for a bi-criteria permutation flow shop scheduling problem

This paper investigates a novel multi-objective model for a permutation flow shop scheduling problem that minimizes both the weighted mean earliness and the weighted mean tardiness. Since a flow shop scheduling problem has been proved to be NP-hard in a strong sense, a new hybrid multi-objective algorithm based on shuffled frog-leaping algorithm (SFLA) and variable neighborhood search (VNS) is devised to find Pareto optimal solutions for the given problem. To validate the performance of the proposed hybrid multi-objective shuffled frog-leaping algorithm (HMOSFLA) in terms of solution quality and diversity level, various test problems are examined. Further, the efficiency of the proposed algorithm, based on various salient metrics, is compared against two well-known multi-objective genetic algorithms: NSGA-II and SPEA-II. Our computational results suggest that the proposed HMOSFLA outperforms the two foregoing algorithms, especially for large-sized problems.     

An intelligent hybrid meta-heuristic for solving a case of no-wait two-stage flexible flow shop scheduling problem with unrelated parallel machines

This paper addresses the problem of no-wait two-stage flexible flow shop scheduling problem (NWTSFFSSP) considering unrelated parallel machines, sequence-dependent setup times, probable reworks and different ready times to actualize the problem. The performance measure used in this study is minimizing maximum completion time (makespan). Because of the complexity of addressed problem, we propose a novel intelligent hybrid algorithm [called hybrid algorithm (HA)] based on imperialist competitive algorithm (ICA) which are combined with simulated annealing (SA), variable neighborhood search (VNS) and genetic algorithm (GA) for solving the mentioned problem. The hybridization is carried out to overcome some existing drawbacks of each of these three algorithms and also for increasing the capability of ICA. To achieve reliable results, Taguchi approach is used to define robust parameters' values for our proposed algorithm. A simulation model is developed to study the performance of our proposed algorithm against ICA, SA, VNS, GA and ant colony optimization (ACO). The results of the study reveal the relative superiority of HA studied. In addition, potential areas for further researches are highlighted.     

基于改进免疫遗传算法的混合车间调度研究

建立了以最大总完成时间最小为目标的混合车间调度模型。该模型包括作业车间和并行流水装配车间两部分调度问题。为降低问题求解难度,采用分解的策略对调度问题分阶段求解,并引入多Agent协商机制和模拟退火算法与免疫遗传算法相结合,提出了基于分解策略的免疫遗传算法,并通过在某汽车减振器企业的实施验证了模型和算法的有效性。     

An effective hybrid particle swarm optimization for no-wait flow shop scheduling

The no-wait flow shop scheduling that requires jobs to be processed without interruption between consecutive machines is a typical NP-hard combinatorial optimization problem, and represents an important area in production scheduling. This paper proposes an effective hybrid algorithm based on particle swarm optimization (PSO) for no-wait flow shop scheduling with the criterion to minimize the maximum completion time (makespan). In the algorithm, a novel encoding scheme based on random key representation is developed, and an efficient population initialization, an effective local search based on the Nawaz-Enscore-Ham (NEH) heuristic, as well as a local search based on simulated annealing (SA) with an adaptive meta-Lamarckian learning strategy are proposed and incorporated into PSO. Simulation results based on well-known benchmarks and comparisons with some existing algorithms demonstrate the effectiveness of the proposed hybrid algorithm.     

A hybrid algorithm based on particle swarm optimization and simulated annealing for a periodic job shop scheduling problem

Generating schedules such that all operations are repeated every constant period of time is as important as generating schedules with minimum delays in all cases where a known discipline is desired or obligated by stakeholders. In this paper, a periodic job shop scheduling problem (PJSSP) based on the periodic event scheduling problem (PESP) is presented, which deviates from the cyclic scheduling. The PESP schedules a number of recurring events as such that each pair of event fulfills certain constraints during a given fixed time period. To solve such a hard PJSS problem, we propose a hybrid algorithm, namely PSO-SA, based on particle swarm optimization (PSO) and simulated annealing (SA) algorithms. To evaluate this proposed PSO-SA, we carry out some randomly constructed instances by which the related results are compared with the proposed SA and PSO algorithms as well as a branch-and-bound algorithm. In addition, we compare the results with a hybrid algorithm embedded with electromagnetic-like mechanism and SA. Moreover, three lower bounds (LBs) are studied, and the gap between the found LBs and the best found solutions are reported. The outcomes prove that the proposed hybrid algorithm is an efficient and effective tool to solve the PJSSP.     

APPLYING PARTICLE SWARMOPTIM IZATION TO JOB-SHOP SCHEDULING PROBLEM

A new heuristic algorithm is proposed for the problem of finding the minimum makespan in the job-shop scheduling problem. The new algorithm is based on the principles of particle swarm optimization (PSO). PSO employs a collaborative population-based search, which is inspired by the social behavior of bird flocking. It combines local search (by self experience) and global search (by neighboring experience), possessing high search efficiency. Simulated annealing (SA) employs certain probability to avoid becoming trapped in a local optimum and the search process can be controlled by the cooling schedule. By reasonably combining these two different search algorithms, a general, fast and easily implemented hybrid optimization algorithm, named HPSO, is developed. The effectiveness and efficiency of the proposed PSO-based algorithm are demonstrated by applying it to some benchmark job-shop scheduling problems and comparing results with other algorithms in literature. Comparing results indicate that PSO-based a     

基于Petri网和混合算法的作业车间优化

采用赋时变迁Petri网,建立了一种作业车间调度模型.通过为机器分配工序来消解因机器库所共享而引起的冲突,得到了表示调度方案的标志图,给出了一种生成可行调度标志图的方法.同时,提出了一种变迁激发序列编码的离散版粒子群算法,并将模拟退火算法嵌入到该粒子群算法中,以提高算法的优化性能.仿真结果验证了混合算法的可行性和有效性.