China’s Aviation Industry: a Global Partnership Strategy

This article discusses one of the main strategies which China has implemented to develop its competency in the aviation field. It is strategic for China to boost its aviation industry via international cooperation and several models of involvement into the global aviation value chain with leading aviation industries. As it is depicted as a strategy here, it is not necessary to say that a formal strong national strategy in encouraging exists. Actually, it is clearly a way China’s aero industry takes to develop its competency and business at the context it encounters. From an observer’s perspective, it is indeed a critical strategy. This article describes this strategy via the context, policies, program cases, as well as the evolution of the cooperation models in order to synthesize the strategy.     

典型水文环境下航空声呐浮标双基地作用范围

航空声呐浮标双基地探测是应对水下目标声隐身能力持续提高的有效技术途径之一。分析了航空声呐浮标的指标,给出了双基地声呐配置,采用双基地声呐方程为依据,利用数值仿真的方法计算了 3种典型海洋环境条件下双基地声呐浮标探测范围,讨论了海洋环境对双基地声呐探测的影响,为航空声呐浮标双基地战术使用奠定技术基础。     

航空数据存储卡毁钥能力评价方法研究

为满足复杂战场态势下机载数据的安全性需求，需要建立对航空数据存储卡毁钥能力有效评价的方法。 建立航空数据存储卡毁钥能力有效性评价的目的是保证航空装备信息安全的重要措施，是科学、准确评价毁钥 设计是否满足需求的重要手段，是航空装备定型列装前必要的信息安全测评过程。通过对航空数据存储卡的典 型结构和硬件毁钥原理进行分析，对毁钥后电学、物理和化学等技术手段进行深入的研究，提出一种针对航空 数据存储卡毁钥能力的评价方法，从数据存储卡读取能力和存储介质损毁状态两个过程对毁钥效果开展评价， 从而规范了当前测评机构对数据存储卡毁钥能力评价过程中无统一方法的现状。本文利用该评价方法对某样品 航空数据存储卡经硬件毁钥试验后开展毁钥效果分析，验证方法的有效性。航空数据存储卡毁钥能力评价方法 可以很好的评估毁钥设计的效果，确保机载数据的安全。     

航空发动机客户需求与技术措施重要度量化评估应用研究

现有的民用航空发动机客户需求重要度的量化评估方法不符合民用航空发展稳中求进的需要。采用Kano 模型和质量功能展开（QFD）方法，提出一种客户需求技术措施重要度量化评估改进算法与技术措施重要度量化评估方法，增加客户需求重要度调整系数中基本型需求的比重，将客户需求进行重要度量化评估并转化为可量化的发动机产品和服务的技术措施，完成技术措施的优先级排序；给出民用航空发动机运行支持体系、换发设备开发的应用案例。结果表明：客户需求重要度量化评估改进算法与技术措施重要度量化评估方法能够在发动机产品和服务研制过程中更加科学有效地进行资源分配与决策，提升产品市场竞争力。     

Review of atomization mechanism and spray characteristics of a liquid jet in supersonic crossflow

The injection and atomization process of a liquid fuel jet is critical for an ignition start of a scramjet engine. Airwall-mounted crossflow injection strategy is widely used in scramjet combustors, avoiding high total pressure loss and allowing the liquid fuel to rapidly undergo atomization, mixing, and evaporation. In this review, research progress on a liquid jet in supersonic crossflow was evaluated from aspects of atomization mechanism and spray characteristics. When a liquid jet is injected into a supersonic crossflow, primary and secondary breakups occur successively. The surface instability of liquid can significantly affect the breakup process. This review discusses the current understanding of the breakup process and spray characteristics of a liquid jet in supersonic crossflow including the mechanism of atomization and the characteristics of distribution and atomization. The development of windward Rayleigh-Taylor (R-T) unstable waves is the main factor in column breakup. The development of Kelvin-Helmholtz (K-H) unstable waves along the circumferential direction of the jet or droplets is the main factor of surface and droplet breakups. The liquid–gas momentum ratio is the most important factor affecting the penetration depth. The span width of the liquid jet is affected by the windward area. Breakup and coalescence lead to a transformation of the size distribution of droplets from S- or C-shaped to I-shaped, and the velocity distribution of the droplets on the central symmetry plane has a mirrored S-shape. The droplet distribution on the spanwise cross-section retains a structure similar to an “Ω” shape. At last, some promising recommendations have been proposed, namely a theoretical predictive model which can describe the breakup mechanism of a liquid jet, the distribution characteristics and droplets size distribution of a liquid jet under a cavity combustion chamber, especially for enthalpy flows with complex wave structures.     

A hybrid deep neural network based on multi-time window convolutional bidirectional LSTM for civil aircraft APU hazard identification

Safety is one of the important topics in the field of civil aviation. Auxiliary Power Unit(APU) is one of important components in aircraft, which provides electrical power and compressed air for aircraft. The hazards in APU are prone to cause economic losses and even casualties. So,actively identifying the hazards in APU before an accident occurs is necessary. In this paper, a Hybrid Deep Neural Network(HDNN) based on multi-time window convolutional neural network-Bidirectional Long Short-Term M...     

舰载航空装备修理级别分析

修理级别分析(LORA)是装备保障性分析工作的重要内容。在总结现有研究成果和经验的基础上,结合某舰载航空装备维修保障实际,提出了基于因素分析法的修理级别综合分析方法。基于单因素给出了经济性和非经济性分析方法和模型。基于多因素方法给出了扩展LORA-BR模型和模糊层次分析法(FAHP)模型。最后,以多因素FAHP方法进行了实例分析。为舰载航空装备修理级别分析进行了有益探索。     

基于适航的通航飞机左边界飞行安全研究

失速/尾旋一直是通航飞机面临的最严重的左边界飞行安全问题，失速/尾旋事故统计结果表明，具备尾旋改出能力，不能避免失速/尾旋造成灾难性后果。为了避免飞机出现无意偏离可控飞行的趋势，通过对“多重防御”理念和基于此理念修订的失速/尾旋条款及其符合性验证方法的解析，提出通过提升飞行员的状态感知、增强飞机抗偏离特性和降低失控危害程度等层面的通航飞机左边界飞行的多重防御体系构建方法。本文提出的方法有助于通航飞机更好的符合新规章中失速尾旋适航条款的要求，达到提升左边界飞行安全的目的。