基于自组织神经网络的空中交通复杂度参数优化及预测

首先介绍了国内外关于空中交通复杂度的定义及研究现状。然后在现有的空中交通复杂度模型中挑选空中交通复杂度参数,再利用自组织神经网络,分析所选取的空中交通复杂度参数之间的关系,达到将高维空中交通复杂度参数进行降维分析的目的。然后对于优化了的空中交通复杂度参数使用RBF神经网络进行预测,比较预测结果,得到最优的空中交通复杂度参数。     

我国航空客运市场需求与经济关联性分析

本文探讨航空客运市场需求与经济的关联性,以此反映我国航空客运需求的主要特点;主要从三个方面通过SPSS回归分析来阐述我国航空客运运输市场需求与经济之间的关联性,并利用回归模型对未来航空客运市场需求进行了预测。     

促进空中乘务专业学生岗位职业能力培养的探索

根据行业需求,在明晰空中乘务专业人才培养目标的基础上,结合该专业主要就业岗位重点分析了空中乘务人员岗位知识能力要求,根据我院教学实践经验分别从“民航基础知识”、“旅客服务素养专项技能训练”两个层面,提出了促进空中乘务专业学生岗位职业能力培养的教学方法。     

Safety assessment of approximate segregated parallel operation on closely spaced parallel runways

With the continuous growth of air traffic flow, some airports in China or other countries begin to construct Closely Spaced Parallel Runways (CSPR) to meet the capacity requirement of civil aviation. In this paper, the simulation and calculation method of flight trajectory is developed, as well as the collision risk calculation method and wake vortex encounter risk calculation method. New methods for departure and go-around procedures are proposed to achieve approximate segregated parallel operation in an attempt to obtain approximately the same results on closely spaced parallel runways as on widely spaced parallel runways. By comparing with the independent parallel departure and segregated parallel operation in ICAO Doc. 9643, it is found that the lateral separation between aircraft in this proposal is not less than the separations in the other two cases. Based on the simulation calculation of flight trajectories under different conditions, the probabilities of collision conflict and encountering wake vortex are lower than those in current operation plan. The proposed plan has no special requirements in pilot operation, control command procedures, airport facilities, or meteorological observation and prediction, so it is convenient to promote and implement at the airports with closely spaced parallel runways.     

航空发动机空气起动系统性能匹配计算方法

为了探索航空发动机空气起动系统的匹配机理,寻找改善全包线内系统性能的技术途径,通过对系统各单元工作特性及相互制约条件的分析,在综合辅助动力装置(APU)、引气管路、调压装置、空气涡轮起动机(ATS)特性计算模型的基础上,发展了一种基于各单元匹配的空气起动系统性能计算方法。该方法能够准确获取系统设计点、各单元特征参数及边界条件,确定APU引气特性、引气管路损失特性、ATS喉道面积和调压装置蝶阀调节规律,进而实现空气起动系统全包线特性计算。利用试验数据对模型进行了校验,结果表明,输出功率计算误差3.5%、引气流量计算误差4%。该模型克服了目前工程上只能单点计算,且需反复迭代的缺陷,为空气起动系统总体性能设计和评估提供了一种有效的分析工具。     

Adaptive double chain quantum genetic algorithm for constrained optimization problems

Optimization problems are often highly constrained and evolutionary algorithms(EAs)are effective methods to tackle this kind of problems. To further improve search efficiency and convergence rate of EAs, this paper presents an adaptive double chain quantum genetic algorithm(ADCQGA) for solving constrained optimization problems. ADCQGA makes use of doubleindividuals to represent solutions that are classified as feasible and infeasible solutions. Fitness(or evaluation) functions are defined for both types of solutions. Based on the fitness function, three types of step evolution(SE) are defined and utilized for judging evolutionary individuals. An adaptive rotation is proposed and used to facilitate updating individuals in different solutions.To further improve the search capability and convergence rate, ADCQGA utilizes an adaptive evolution process(AEP), adaptive mutation and replacement techniques. ADCQGA was first tested on a widely used benchmark function to illustrate the relationship between initial parameter values and the convergence rate/search capability. Then the proposed ADCQGA is successfully applied to solve other twelve benchmark functions and five well-known constrained engineering design problems. Multi-aircraft cooperative target allocation problem is a typical constrained optimization problem and requires efficient methods to tackle. Finally, ADCQGA is successfully applied to solving the target allocation problem.     

Vulnerability analysis for airport networks based on fuzzy soft sets: From the structural and functional perspective

Recently,much attention has been paid to the reliability and vulnerability of critical infrastructure.In air traffic systems,the vulnerability analysis for airport networks can be used to guide air traffic administrations in their prioritization of the maintenance and repair of airports,as well as to avoid unnecessary disturbances in the planning of flight schedules.In this paper,the evaluation methods of airport importance and network efficiency are established.Firstly,the evaluation indices of airport importance are proposed from both the topological and functional perspectives.The topological characteristics come from the structure of airport network and the functional features stem from the traffic flow distribution taking place inside the network.Secondly,an integrated evaluation method based on fuzzy soft set theory is proposed to identify the key airports,which can fuse together importance indices over different time intervals.Thirdly,an airport network efficiency method is established for the purpose of assessing the accuracy of the evaluation method.Finally,empirical studies using real traffic data of US and China’s airport networks show that the evaluation method proposed in this paper is the most accurate.The vulnerability of US and China’s airport networks is compared.The similarities and differences between airport geography distribution and airport importance distribution are discussed here and the dynamics of airport importance is studied as well.     

以体验提升航空服务质量的策略研究

航空服务若想在激烈的市场竞争中取胜,将体验融于服务,开发设计出令人难忘的客户体验,无疑将对提升服务质量,保持客户忠诚度起到关键作用。本文从体验与航空服务的互动关系出发,分析了体验在航空服务中的重要作用,探讨了航空服务中体验设计的方法,帮助探寻民航企业体验设计中的重要依托要素。     

空防对抗仿真的情景想定设计

为使空防对抗仿真更接近实战，对仿真情景想定设计作了改进。将防空区等分成4个扇形区，在确定对突防飞机威胁最大的影响因素的基础上，根据动态规划法得出进袭飞机采用不同航线时防空方不同部署形式的赢得矩阵，并由布朗算法计算该矩阵，得出攻防双方作战方案的选取概率。仿真计算结果表明，该设计方法较合理，避免了仿真的盲目性，对战术仿真有一定的参考价值。     

气流展纤工艺中不同压差和送丝速度对碳纤维展宽的影响

为探究气流展纤工艺中不同出口压差和送丝速度对碳纤维丝束展宽效果的影响,依据Venturi原理,搭建气流展纤试验平台,并记录大丝束碳纤维展宽过程,计算不同工艺参数下碳纤维丝束在不同阶段的展宽率和展宽均匀程度。研究结果表明：通过搭建的气流展纤试验台,能获得展宽率高于400%,展宽均匀程度在90%以上的碳纤维丝束,得到的碳纤维丝束的展宽率与出口压差呈正相关,与送丝速度呈负相关;碳纤维丝束的展宽均匀程度与出口压差呈负相关,与送丝速度呈正相关。