求解车间作业调度问题的混合遗传模拟退火算法

为了克服传统遗传算法解决车间作业调度问题的局限性,结合遗传算法(GA)和模拟退火算法(SA)的优点,提出一种混合遗传模拟退火算法(GASA),以便高效地解决车间作业调度问题.该算法既发挥了遗传算法收敛速度快、模拟退火算法搜索面广的优点,又克服了前者收敛容易早熟而后者收敛速度较慢的问题.在算法的操作细节上,加入自适应调整的遗传操作及最优个体保留策略,以及增加记忆功能的模拟退火操作与收敛准则.从而既防止了算法会陷入局部最优解的问题,又提高了算法的收敛速度及搜索效率.将提出的混合遗传模拟退火算法(GASA)应用于Muth和Thompson基准问题的实验运行,证明了该算法的高效性和有效性.     

模拟退火遗传算法在车间作业调度中的应用

研究车间作业调度系统,使资源达到优化配置.针对提高产品质量,缩短周期,传统遗传算法应用于车间作业调度过程中易出现收敛速度慢、易陷入局部最优,导致作业调度效率极低.为了提高车间作业调度的效率,提出一种模拟退火遗传算法的车间作业调度方法.在遗传算法种群更新过程引入模拟退火机制,防止早熟现象的产生,使种群在更新迭代过程中保持了多样性,加快了收敛速度,克服遗传算法过早收敛的缺陷.采用的SA-GA算法能够在最短时间找作业调度的最优解,对30个车间作业调度标准测试案例进行了仿真.仿真结果表明,使相对平均误差降低了4.6%,极大的提高了车间作业调度效率,验证了在实际生产中应用的可行和优越性.     

自适应最优保存的模拟退火遗传调度算法研究及其应用

该文对调度算法做了简单的介绍。在结合已有的模拟退火算法和遗传算法的基础上,改进了现有的遗传调度算法,自适应地保存最优个体,并对其进行模拟退火。与简单最优保存遗传调度算法进行了比较,结果表明新的算法比原有算法搜索能力更强,在跳出局部最优方面也有改进,有效地解决了原有遗传调度算法的早熟现象。     

一种求解Job-Shop调度问题的混合自适应变异粒子群算法

本文提出了用于解决车间作业调度问题的混合自适应变异粒子群算法,该算法在运行的过程中根据群体适应度方差以及当前最优解的大小来确定当前最佳粒子的变异概率,利用遗传算法思想对粒子进行选择、交叉操作,并将模拟退火算法的优点融入到AMPSO算法中。仿真结果表明,混合AMPSO算法能够有效地、高质量地解决作业车间调度问题。     

流水作业批调度问题优化算法研究

为解决流水作业环境作业尺寸有差异的批调度问题,建立了基于混合整数规划方法的最大时间跨度模型,分析问题的计算复杂性,给出设备数、作业数既定情况下的可行解规模.设计一种混合蚁群算法对最大时间跨度进行优化,结合算法的搜索机制和批调度启发式规则,实现了最小化最大时间跨度.利用模拟退火方法改进蚁群算法路径选择,避免算法陷入局部最优和过早收敛.实验设计随机算例,对各类不同规模的算例进行仿真实验,实验结果表明混合蚁群算法在最优解、平均运行时间和最大时间跨度等方面优于其他同类算法.     

基于记忆库拉马克进化算法的作业车间调度

多种群遗传算法相比遗传算法在性能上能够有所提高,但对具有较多局部最优解的作业车间调度问题,多种群遗传算法仍然难以改善易陷入局部最优解和局部搜索能力差的缺点.因此,提出了一种求解作业车间调度问题的新算法MGA-MBL(multi-population genetic algorithm based on memory-base and Lamarckian evolution for job shop scheduling problem).MGA-MBL在多种群遗传算法的基础上通过引入记忆库策略,不但使子种群间的个体可以进行信息交换,而且有利于保持整个种群的多样性;通过构造基于拉马克进化机制的局部搜索算子来提高多种群遗传算法中子种群进化的局部搜索能力.由于MGA-MBL采用了全局寻优能力较强的模拟退火算法对记忆库中的个体进行优化,从而缓解了多种群遗传算法易陷入局部最优解的问题,并提高了算法求解作业车间调度问题的性能.对著名的benchmark数据进行测试,实验结果证实了MGA-MBL在求解作业车间调度问题上的有效性.     

车间作业调度问题的仿真研究

研究车间作业调度优化问题,使资源、车辆调试、交通分配等达到优化配置,因此车间作业调度问题是一个多约束条件的目标优化问题,采用多项式求解方法不能获得最优解,导致车间作业调度效率低.为了提高车间作业调度效率,提出了一种蚁群算法的车间作业调度优化算法.首先以最小加工时间作为优化目标,蚂蚁爬行路径为作业调度方案,通过蚁群中个体间互相协作和信息交流获得最优车间作业调度方案.通过车间作业调度测试案例对算法进行验证性实验,实验结果表明,蚁群算法提高了车间作业调度效率,能在最短时间找到最优调度方案,为车间作业调度优化提供了依据.     

模拟退火下布谷鸟算法求解车间作业调度问题

针对车间作业调度问题（JSP）,在标准布谷鸟算法的莱维飞行中加入自适应机制,寻优过程中引入二值交叉算子保持改进算法的种群多样性,最后在模拟退火框架下增强改进算法跳出局部最优的能力。通过标准算例对所提的改进算法进行实验仿真,结果证明了改进算法的正确性和有效性。     

粒子群算法在车间作业调度问题中的仿真研究

研究车间作业调度问题,优化资源配置.车间作业度问题(JSP)是一类典型的NP-hard问题,针对传统方法在JSP应用过程中,存在速度慢、易陷入局部最优,导致车间作业调度效率低.为了解决车间作业调度效率低的难题,提出了一种粒子群算法的车间作业调度方法.该方法将每个粒子代表一种作业调度方案,以最小化加工时间作为算法的优化目标,通过粒子群之间的协作来获得最优作业调度方案.采用JSP标准测试案例在Matlab平台上对该方法进行了验证性实验,实验结果表明,相对于传统方法,该方法能够在最短时间找作业调度的最优解,提高了车间作业调度效率,是一个求解车间作业调度问题的有效方法.     

基于模拟退火遗传算法的多项目调度问题研究

针对多资源约束条件下的多项目调度问题,提出了一种模拟退火遗传算法的求解方法.该方法首先分别对普通的遗传算法和模拟退火算法进行改进,然后在遗传算法中插入模拟退火操作,通过模拟退火操作来克服遗传算法容易陷入局部最优解的缺陷,同时该方法也继承了遗传算法收敛速度快的特点.最后的实例计算结果表明该算法能克服模拟退火算法和遗传算法的缺点,获得比其它算法更优的解,与其它启发式算法及智能算法相比具有更高的求解效率.     

双资源生产车间调度问题的研究

将遗传算法(GA)和模拟退火算法(SA)相结合研究了双资源生产车间的调度优化问题,该混合算法将机床设备和工人合理地分配给加工任务,使评价性能指标获得最优。通过与国内外学者的算法进行比较,本算法获得的生产周期最短,机床利用率和工人利用率都较高,并且在某些情况下,平均流动时间也较短。因此可以证明本算法具有一定的优越性。     

A revised simulated annealing algorithm for obtaining the minimum total tardiness in job shop scheduling problems

This paper applies a revised configuration generation mechanism of the Simulated Annealing (SA) algorithm to obtain the minimum total tardiness in job shop scheduling problems. In addition to always generating feasible configurations, this revised mechanism can also exclude some cost non-decreasing configurations in advance. The revised SA method is also compared with a more tailored algorithm (MEHA) and two other SA approaches. Computational results indicate that the solution quality of the SA approaches outperform MEHA. Among the three SA approaches, the revised SA has the best performance. Moreover, the SA approaches differ insignificantly in terms of computational time.     

Security‐aware scheduling model for computational grid

Grid applications with stringent security requirements introduce challenging concerns because the schedule devised by nonsecurity‐aware scheduling algorithms may suffer in scheduling security constraints tasks. To make security‐aware scheduling, estimation and quantification of security overhead is necessary. The proposed model quantifies security, in the form of security levels, on the basis of the negotiated cipher suite between task and the grid‐node and incorporates it into existing heuristics MinMin and MaxMin to make it security‐aware MinMin(SA) and MaxMin(SA). It also proposes SPMaxMin (Security Prioritized MinMin) and its comparison with three heuristics MinMin(SA), MaxMin(SA), and SPMinMin on heterogeneous grid/task environment. Extensive computer simulation results reveal that the performance of the various heuristics varies with the variation in computational and security heterogeneity. Its analysis over nine heterogeneous grid/task workload situations indicates that an algorithm that performs better for one workload degrades in another. It is conspicuous that for a particular workload one algorithm gives better makespan while another gives better response time. Finally, a security‐aware scheduling model is proposed, which adapts itself to the dynamic nature of the grid and picks the best suited algorithm among the four analyzed heuristics on the basis of job characteristics, grid characteristics, and desired performance metric. Copyright © 2011 John Wiley & Sons, Ltd.     

A novel methodology for optimal single mobile robot scheduling using whale optimization algorithm

One of the fundamental requirements for creating an intelligent manufacturing environment is to develop a reliable, efficient and optimally scheduled material transport system. Besides traditional material transport solutions based on conveyor belts, industrial trucks, or automated guided vehicles, nowadays intelligent mobile robots are becoming widely used to satisfy this requirement. In this paper, the authors analyze a single mobile robot scheduling problem in order to find an optimal way to transport raw materials, goods, and parts within an intelligent manufacturing system. The proposed methodology is based on biologically inspired Whale Optimization Algorithm (WOA) and is aimed to find the optimal solution of the nondeterministic polynomial-hard (NP-hard) scheduling problem. The authors propose a novel mathematical model for the problem and give a mathematical formulation for minimization of seven fitness functions (makespan, robot finishing time, transport time, balanced level of robot utilization, robot waiting time, job waiting time, as well as total robot and job waiting time). This newly developed methodology is extensively experimentally tested on 26 benchmark problems through three experimental studies and compared to five meta-heuristic algorithms including genetic algorithm (GA), simulated annealing (SA), generic and chaotic Particle Swarm Optimization algorithm (PSO and cPSO), and hybrid GA–SA algorithm. Furthermore, the data are analyzed by using the Friedman statistical test to prove that results are statistically significant. Finally, generated scheduling plans are tested by Khepera II mobile robot within a laboratory model of the manufacturing environment. The experimental results show that the proposed methodology provides very competitive results compared to the state-of-art optimization algorithms.     

Heuristics for the two‐machine scheduling problem with a single server

In this paper, the NP‐hard two‐machine scheduling problem with a single server is addressed. The problem consists of a given set of jobs to be scheduled on two identical parallel machines, where each job must be processed on one of the machines, and prior to processing, the job is set up on its machine using one server; the latter is shared between the two machines. An ant colony optimization (ACO) algorithm is introduced for the problem and its performance was assessed by comparing with an exact solution (branch and bound [B&B]), a genetic algorithm (GA), and simulated annealing (SA). The computational results reflected the superiority of “ACO” in large problems, with a performance similar to SA and GA in smaller problems, while solving the tested problems within a reasonable computational time.     

RB-FIFT--一种结合Firstfit及预约回填策略的机群作业调度算法

机群作业管理是机群系统软件的重要组成部分,作业调度策略则是机群作业管理系统的核心．作业调度策略的选择不仅关系到机群系统的效率,还影响了用户作业的响应时间．目前,Firstfit调度算法已经相当成熟并且广泛应用于机群作业调度．传统的Firstfit算法虽然着眼于减少资源碎片,但未能解决作业饥饿问题．曙光超级服务器作业管理系统JMS改进了既有的结合Firstfit和优先级的作业调度算法P-FIFT,将预约和回填策略与Firstfit相结合,引入了新的RB-FIFT调度策略．实验结果表明,与传统Firstfit算法及P—FIFT算法比较,RB-FIFT调度策略不但能够消除系统中作业的饥饿现象,而且大大减少了资源碎片,提高了系统的吞吐率和资源利用率．     

基于延迟调度策略的Reduce调度优化算法

在大规模的Hadoop集群中,良好的任务调度策略对提高数据本地性、减小网络传输开销、减少作业执行时间以及提高集群的作业吞吐量都有着重要的影响。本文针对Hadoop架构中Reduce任务的数据本地性较低问题,提出了一种基于延迟调度策略的Reduce任务调度优化算法,通过提高Reduce任务的数据本地性来减少作业执行时间以及提高作业吞吐量,该算法在Hadoop架构的Early Shuffle阶段,使用多级延迟调度策略来提高Reduce任务的数据本地性。最后重写原生公平调度器代码实现了该调度算法,并与原生公平调度器进行了对比实验分析,实验结果表明该算法明显减少了作业执行时间,提高了集群的作业吞吐量。     

Unrelated parallel machine scheduling with setup times using simulated annealing

This paper presents a scheduling problem for unrelated parallel machines with sequence-dependent setup times, using simulated annealing (SA). The problem accounts for allotting work parts of L jobs into M parallel unrelated machines, where a job refers to a lot composed of N items. Some jobs may have different items while every item within each job has an identical processing time with a common due date. Each machine has its own processing times according to the characteristics of the machine as well as job types. Setup times are machine independent but job sequence dependent. SA, a meta-heuristic, is employed in this study to determine a scheduling policy so as to minimize total tardiness. The suggested SA method utilizes six job or item rearranging techniques to generate neighborhood solutions. The experimental analysis shows that the proposed SA method significantly outperforms a neighborhood search method in terms of total tardiness.     

航班过站地面服务的优化调度算法

航班过站服务流程是定位型和零工型的混合流程，其调度问题是一个有时间窗和作业调整时间的多目标多设备并行作业动态排序问题．在分析其区别于一般制造业生产作业排序特点的基础上，给出一个考虑了不同设备加工能力的新的启发式算法——设备能力差分配法．通过对服务作业分类，将多目标优化问题转化为服务类作业排序最优化问题．算例分析显示，能力差分配算法在减少航班延误数量、时间上以及平衡设备生产能力上均优于现有的先到先服务和最小负荷调度算法．     

The periodicity and robustness in a single-track train scheduling problem

The most important operating problem in any railway industry is to produce robust train timetables with minimum delays. The train scheduling problem is defined as an application of job shop scheduling which is considered to be one of the most interesting research topics. This paper deals with scheduling different types of trains in a single railway track. The authors have focused on the robust and periodic aspects of produced timetables. This paper is also concerned with some applicable constraints, such as the acceleration and deceleration times, station capacity and headway constraints. The periodic timetable for railways is modeled based on the periodic event scheduling problem (PESP). Furthermore, a fuzzy approach is used to reach a tradeoff among the total train delays, the robustness of schedules, and the time interval between departures of trains from the same origins. To solve large-scale problems, a meta-heuristic algorithm based on simulated annealing (SA) is utilized and validated using some numerical examples on a periodic robust train scheduling problem. Finally, a robustness measure is defined in order to assure the effectiveness of the proposed SA to find robust solutions.