航空乘务员机型执照规划与签派员生产规划研究
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摘要
近年来,随着国民经济的迅速发展及航空市场的逐步开放,航空运输量和飞行范围日益扩大,民航运输飞行安全管理的工作越来越重要。影响航空运行安全的因素涉及飞行器/飞行辅助设备等硬件设备的可靠性技术因素、人员培训体制/各种规章和程序等人为因素、组织和管理因素等,但其中最关键的因素是:“人”。加强对“人”的管理,其关键在于对飞行安全链条上所涉及的关键技术人才的管理。航空公司飞行安全链条上涉及的主要运行业务环节有飞行员、客舱服务、地面保障、机务工程和维修、运行控制。本文以客舱服务及运行控制部门的关键技术人才:客舱乘务员和飞行签派员为研究对象,从安全角度出发,研究客舱乘务员的机型执照规划问题和飞行签派员生产规划相关的一系列问题。本文的主要研究内容如下:
     一、针对航空乘务员,分别基于生产保障度最大与乘务员人均收益均衡目标,在满足生产任务需求、乘务员服务机型数量限制的条件下,研究乘务员机型执照规划问题,确定每个机型执照组合的乘务员人数。这里,机型执照组合指乘务员持有的机型执照种类的集合。本文将乘务员机型执照规划问题分解为乘务员需求估计及乘务员机型执照配置优化两个问题,并主要研究乘务员机型执照优化配置问题,该问题细分为下面两个研究内容:
     (1)生产保障度最大目标下,乘务员服务机型数量限制的乘务员机型执照配置优化问题。生产保障度是机型执照方案对生产运行保障度的评价指标,生产保障度越大,该机型执照规划方案越能应对未来生产的波动性。
     (2)乘务员人均收益均衡目标下,满足生产保障度和乘务员服务机型数量限制约束的乘务员机型执照配置优化问题。乘务员人均收益均衡是机型执照方案对乘务员个人收益差异的影响指标。
     二、针对飞行签派员,研究的主要内容有:
     (1)对飞行签派员的工作负荷进行刻画,得到签派工作负荷的高峰时段、分析具有较高峰值负荷签派席位处理的航班组成状况,为合理分配航线提供支持。
     (2)将签派放行席位的工作劳动强度用该席位单位时段的工作负荷来体现,研究基于峰值负荷最小的签派放行席位任务调度问题,得到放行席位的峰值负荷最小的工作安排,为合理分配席位间的放行任务提供决策支持。
     (3)给定签派放行的的席位集合、放行任务集合和任务随时间的工作负荷分布下,研究峰值负荷最小及总负荷量最小的双目标下的签派放行席位间的任务分配问题。
     本文采用的方法和主要结论如下:
     第一、在生产保障度目标下的乘务员机型执照配置优化问题中,本文提出一个解的构造算法,该算法对某一类问题可直接构造出最优解,对其他类问题得到与最优解差异最大为1/n0的可行解,这里n0是不同类型机型生产的需求人数的最小值。
     第二、在生产保障度目标最大,人均收益均衡的客舱乘务员机型执照配置优化问题中,本文将问题抽象为每个箱子装相同数量的物品,但物品的种类各不相同的一维装箱问题,并提出一个基于LPT算法思想的贪婪算法,并得出k≤2,该算法给出最优解;k>2,最坏情况下的性能比为2-M-1的结论。这里,k是乘务员可持有的机型执照数量,M是乘务员总人数。在k>2下,又分析了k的具体取值对最坏情况性能比的影响。
     第三、在基于峰值负荷最小的签派放行席位任务调度的研究问题中,本文中将问题描述为有优先序任务排序的单机排序问题,每个任务都有一个到达时间,截止期限和处理时间,目标是在不延误完成任务的前提下,使机器的峰值负荷最小,并提出了一个有效算法,且证明出该算法给出的任务安排计划是最优安排。
     第四、在签派放行岗位间的任务分配问题中,本中采用两种VNS算法-VND和RVNS来解决这个问题。在求解过程中,两种领域选择方式-插入和交换类型工作被定义并用在领域搜索算法中;Vazirani提出的修正的平行机调度启发式算法被用来求解初始解。最后采用某航空公司的航班放行数据来评估我们算法的效能,案例的结果表明,VND与RVNS均能提供稳定且较好的结果。
     本文的主要创新点有,第一,首次对客舱乘务员机型执照配置问题进行建模,并设计出有效算法(解构造算法和基于LPT算法思想的贪婪算法)求解;第二,首次对飞行签派员的任务配置问题进行建模,并设计最优算法求解。
In recent years, with the rapid development of economic and the gradual liberalization of the aviation market, airline traffic volume and fight area will rapidly grow; the topic of safety management for civil aviation is more and more important. Factors which affect the safety of aviation operations involve the physical properties of the aircraft and auxiliary equipment, flight/monitoring/maintenance techniques, operating environment, weather and other uncontrollable factors and other aspects, but one of the most critical factors is:'human'. For strengthening the management of 'human', the key lies in the management of key technical personnel involved in flight safety chain. The main operational elements involved in flight safety chain are pilots, cabin services, ground support, maintenance engineering and maintenance, operational control. In this paper, we choose cabin-crew in cabin service and flight dispatchers in operational control as the research objects, and study the license planning for cabin-crew and some production planning for flight dispatchers from a security perspective. The main contents are as follows:
     1. The problem on license planning for equal rank cabin-crew is:how do employees choose proper skill combinations to attain some goals, under constraintion of maximal license amout holded by one person and production demands? Here, skill combination is the set of skill types holded by one cabin-crew. Goals considered in this paper contain maximum production security level and equilibrium for individual average earnings. In this paper, we divided the problem on license planning into two problems:demand forcast and the license allocation optimization problem. Moreover, we primary study the last one, which mainly contains two contents:
     (1) The license allocation optimization problem with maximum production security level based on satisfied production demand. Production security level is the evaluation of license planning on the protection degree of the production, the higer the production security level, the more possibility to cope with the volatility of future.
     (2) The license allocation optimization problem on a single objective of cabin-crew personal profit equilibrium based on the feasible region of the optimal solution on problem (1). Cabin-crew personal profit equilibrium is indicators for crew personal income's differences.
     2. For airline dispatchers, we primary study the following contens:
     (1) Workload analysis for dispatchers. We depict release workload of one flight by the average procession time unifing the subjective workload and objective load. Then we provide some indicators for depicting the work load fluctuations of a dispatch post and the total workload degree of this post. We can get the required peak hours needed to be caused of one post and provide decision support of proper task allocation by anlysising the flights composition of that post.
     (2) Using hourly-load to reflect the workload intensity thythm of one post and study task scheduling with objective of mimimum peak-load on a dispatch release post.
     (3) Task allocation for dispatch release posts with two-objective:minimum peak load and total load by given post numbers, dispatch jobs and workload distribution over time.
     The methodology and key findings in this paper are as follows:
     1) On license allocation optimization problem with objective of maximum production security level, we propose a solution construction method to directly construct a feasible solution and analyze its performance. The results show that the method can get the optimal solution for a class of problem S, else get an approximate solution and the absolute difference between it and the optimal solution is at most1/no, where n0is the smallest person demand of aircafte types.
     2) On license allocation optimization problem with objective of cabin-crew personal profit equilibrium, we consider this problem as the problem of balanced packing problem with items'type restriction, here, balanced packing means each bins contain equal number of items and items'type restriction means each item included in one bin has different type. This problem is an extended balanced number partitioning problem, and has wide application in the industry where one person can hold multi-skill licenses. We give a greedy algorithm based on LPT algorithm's idea and have the following conclusions:k<2, greedy algorithm get optimal solution; k>2, the performance ratio is2-M-1, here, M denotes the amount of bins.
     3) On the problem of task scheduling with objective of mimimum peak-load on a dispatch release post, we use hourly-load to reflect the workload intensity thythm of one post. We descriptions this problem as a one-machine scheduling problem with n jobs. Each task has a release time, deadline and its processing time. Our goal is getting the minimum peak load of the machine, on the conditions of accomplishing it before its deadline. Under the goal, we propose an effective algorithm and give the proof of its accuracy.
     4) On problem of task allocation for dispatch release posts with multi-objectives. Two types of variable neighborhood search algorithm (VNS) are used to solve the multi-objective parallel machine scheduling with classified jobs. Through computational experiments by using our VNS algorithm, good performance was displayed in generating a variety of Pareto-optimal schedules in terms of solution quality and computational time.
     The main innovations of this paper are as follows:mathematic model for cabin-crew license planning is first proposed and effective algorithms are designed for solving this problem (solution construction algorithm and a greedy algorithm based on the LPT algorithm); mathematic model of task allocation for dispathcers is first proposed and effective algorithms are designed for solving it.
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