Challenges of future aircraft propulsion: A review of distributed propulsion technology and its potential application for the all electric commercial aircraft

This paper highlights the role of distributed propulsion technology for future commercial aircraft. After an initial historical perspective on the conceptual aspects of distributed propulsion technology and a glimpse at numerous aircraft that have taken distributed propulsion technology to flight, the focal point of the review is shifted towards a potential role this technology may entail for future commercial aircraft. Technological limitations and challenges of this specific technology are also considered in combination with an all electric aircraft concept, as means of predicting the challenges associated with the design process of a next generation commercial aircraft.     

关于我国飞机租赁立法的构想

阐述了我国租赁立法及我国飞机租赁立法的现状、从理论上论述我国建立"以民航法八条为主，辅之以专门行政法规"的飞机租赁法律体制的立法构想。同时，对我国飞机租赁立法中所面J］占的问题，提出自己的看法和建议。     

一种面向对象的Petri网

柔性制造系统属于离散事件动态系统，具有实时、并发、异步等特性，由于Ｐｅｔｒｉ网模型的图形表述和数学描述，使它既可以采用数学分析，又可以通过图形形象地表述出离散动态系统，故广泛应用于制造过程动态行为建模与分析。而面向对象建模与设计是一种围绕真实世界的概念来组织模型的全新的思考问题方式，面向对象的模型能帮助对问题的理解，有助于同领域专家通讯交流。本文在Ｐｅｔｒｉ网基础上，引入面向对象技术，提出了一种面向对象Ｐｅｔｒｉ网（ＯＰＮ）模型，并以企业中的一项生产活动——二次电源生产过程为实例，建立了描述这一活动系统的完整的ＯＰＮ模型，真实地反映了系统的动态特性，从而为制造过程建模和分析提供了一个更为有效的工具     

Review on signal-by-wire and power-by-wire actuation for more electric aircraft

The huge and rapid progress in electric drives offers new opportunities to improve the performances of aircraft at all levels:fuel burn,environmental footprint,safety,integration and production,serviceability,and maintainability.Actuation for safety-critical applications like flight-controls,landing gears,and even engines is one of the major consumers of non-propulsive power.Conventional actuation with centralized hydraulic power generation and distribution and control of power by throttling has been well established for decades,but offers a limited potential of evolution.In this context,electric drives become more and more attractive to remove the natural drawbacks of conventional actuation and to offer new opportunities for improving performance.This paper takes the stock,at both the signal and power levels,of the evolution of actuation for safety-critical applications in aerospace.It focuses on the recent advances and the remaining chal lenges to be taken toward full electrical actuation for commercial and military aircraft,helicopters,and launchers.It logically starts by emphasizing the specificity of safety-critical actuation for aero space.The following section addresses in details the evolution of aerospace actuation from mechanically-signaled and hydraulically-supplied to all electric,with special emphasis on research and development programs and on solutions entered into service.Finally,the last section reviews the challenges to be taken to generalize the use of all-electric actuators for future aircraft programs.     

基于系统类比的火控精度考核方法

火控系统的综合误差是由火控系统原理误差、弹道散布误差、飞行员瞄准误差和中间风等多种随机因素带来的误差构成，为考核系统原理误差，必须从实弹打靶结果中剔除其它方面误差。采用传统的外弹道测试法，试飞周期长，耗费大量人力和财务。本文提出了一种基于系统类比的火控精度考核方法，从已鉴定的成熟系统中获取后几项误差并予以剔除。理论计算和实弹打靶表明，这是一种有效、经济的精度考核方法，为同种飞机使用不同火控系统的精     

B型手推式高压油泵车的改进改型

介绍了用于为飞机液压系统提供液压动力的手推式高压油泵车在体积、重量、功率、噪声等方面的改进,以及新增自循环清洗及联机系统清洗、离线和在线污染度检测等功能,满足了使用要求.     

高校图书馆社会化服务问题及路径探讨

在分析高校图书馆社会化服务现状的基础上,审视了高校图书馆现阶段开展社会化服务存在的诸多问题及原因,提出高校图书馆开放于社会、服务于公众是历史的必然走向和现实要求。明晰各种不利因素的影响对推进社会化服务的进程大有裨益。对推进高校图书馆社会化服务进行了初步探讨,提出了营造氛围、强化内因、整合资源、健全制度的分步实施发展路径。     

高原机场终端区飞行闭环稳定性分析

分析了高原机场终端区飞行的特殊性和影响高原机场飞行闭环稳定性的各种不利因素,指出了在高原机场缺氧条件下对飞行员数学模型修正的必要性和修正方法.采用等效闭环系统方法分析飞机在高原机场环境下的闭环稳定性,利用该思路可以用常规的分析方法研究高原机场飞行员缺氧条件下的闭环稳定性.     

面向飞机维修过程的数字支援系统研究

在研究欧盟的民用飞机维修方式研究计划(TATEM)的基础上,分析飞机维修过程的主要因素并建立了飞机维修过程的数学模型。通过模糊数学知识实现对数字支援系统拟采用的技术手段对飞机维修工程促进作用的评价,详细设计了数字支援系统的主要功能模块,并用于指导系统软件的开发。面向飞机维修过程的数字支援系统的研究与开发对于其他复杂设备的维修过程数字化建设有着重要的借鉴意义。     

Assessing the feasibility of involving gaseous products resulting from physicochemical oxidation of human liquid and solid wastes in the cycling of a bio-technical life support system

The study addresses the possible ways of involving gaseous products produced by “wet” incineration of human wastes mixed with H₂O₂ in an alternating electric field in the cycling of the physical model of a bio-technical life support system (BTLSS). The resulting gas mixture contains CO₂ and O₂, which are easily involved in the cycling in the closed ecosystem, and NH₃, which is unacceptable in the atmosphere of the BTLSS. NH₃ fixation has been proposed, which is followed by nitrification and involvement of the resulting products in the mass exchange of the closed system. Experiments have been performed to show that plants can be grown in the atmosphere resulting from the closing of the gas loop that includes a physicochemical installation and a growth chamber with plants representing the phototrophic compartment of the BTLSS. The results of the study suggest the conclusion that the proposed method of organic waste oxidation can be a useful tool in creating a physical model of a closed-loop integrated BTLSS.