波音借复合材料项目扩大与中国合作

波音与中国开展工业合作已经有近30年的历史，随着时间的推移，双方的合作不仅在交付额，而且在制造水平和合作方式上都有了显著地提升，未来这种趋势将进一步延续和扩展。     

动态

中航技30年硕果累累成立于1979年1月的中国航空工业技术进出口公司(中航技),从事国家防务和民用航空所需要的航空技术和产品进出口,是国产飞机出口的主渠道。30年来,中航技向世界40多个国家出口各种型号国产飞机1300多     

波音与中国商飞的生物燃料项目取得进展

波音与中国商飞近日宣布,双方联合开展的“废弃油脂”项目取得突破,开发了一条比传统油脂直接加氢脱氧更为经济的转化途径。目前,中国商飞一波音航空节能减排技术中心正在杭州筹建“中试车间”——一条日产0．5t航空生物燃料的生产示范线,以验证新的转化途径进行批量生产的可行性、环保性、安全性、经济性等一系列工业指标。     

赛斯纳162赛斯纳公司与中国开展工业合作的新开端——访赛斯纳公司结构工程部部长史建元

2007年11月28日，美国赛斯纳飞机公司与中国一航沈阳飞机工业（集团）公司签约合作生产赛斯纳162轻型运动飞机，迈出了与中国航空工业开展合作的新步伐。就双方合作概况与合作前景等问题，本刊记者专访了赛斯纳公司结构工程部部长史建元。     

波音将与中国开展更加深远的合作——访波音公司董事长、总裁兼首席执行官詹姆斯·迈克纳尼

5月下旬,61岁的波音公司董事长、总裁兼首席执行官詹姆斯·迈克纳尼先生到华访问。他此行的主要目的是慰问员工,拜访中国政府部门的官员,与合作伙伴会面及向外界介绍新任波音中国总裁马爱伦(Bertrand-Marc Allen)先生。用迈克纳尼先生自己的话说,这是一次"常规的访问"。26日,迈克纳尼先生接受了媒体记者的采访。     

构筑航空枢纽和全球航线网络——从民航大国向民航强国迈进的必由之路

2004年9月7日民航总局在京召开国际航空运输研讨会,会上国际合作司王荣华司长介绍了中国民航国际运输的现状,国际合作司国际处柳芳处长介绍了近两年与东盟、中美、中法、中英、中荷、中北欧、拉美、中澳、中新、中韩等新签的双边航空运输协定和航权安排,运输司何锦日副司长介绍了第二天即将签署的香港航权谈判情况,最后民航总局杨国庆副局长就中国民航构筑航空枢纽和全球航线网络促进国际航空运输和经济发展的战略设想作了总结发言。一、中国民航国际运输的现状截止2004年9月,中国已与93个国家签订了航空运输协定,与3个国家草签了航空运输协…     

赢得时间就是赢得一切——记首架中巴合作生产的ERJ145下线

12月16日,中国与巴西合作生产 的首架50座ERJ145飞机下线并成功完成首飞。来自中国和巴西政府有关部门的高级官员、中国骨干航空公司的高层领导以及合作伙伴和供应商的代表等共300多人应邀参加了在哈飞举行的下线和首飞仪式。当巴西航空工业公司总裁博泰罗、民航总局局长杨元元、黑龙江省省长宋法棠等领导同时按下按钮,为这架ERJ145飞机揭幕的那一刹那,全场爆发出雷鸣般的掌声。ERJ145的成功不仅标志着中巴双方的合作迈出了成功的第一步,进入了崭新的历史发展阶段,同时也是中国航空工业积极寻求以国际合作方式推动航空技术进步战略…     

Effects of aircraft emissions on ozone,cirrus clouds,and global climate

Although gaseous emissions from aircraft represent only a small fraction of all man made emissions, they may have particular significance because they are delivered directly into the upper atmosphere. This paper describes some research investigations of the effects of aircraft emissions and reviews the impact of those effects upon global climate.     

Design and integration of a solar AMTEC power system with anadvanced global positioning satellite

A 1,200-W solar AMTEC (alkali metal thermal-to-electric conversion) power system concept was developed and integrated with an advanced global positioning system (GPS) satellite. The critical integration issues for the SAMTEC with the GPS subsystems included: (1) packaging within the Delta II launch vehicle envelope; (2) deployment and start-up operations for the SAMTEC; (3) SAMTEC operation during all mission phases; (4) satellite field of view restrictions with satellite operations; and (5) effect of the SAMTEC requirements on other satellite subsystems. The SAMTEC power system was compared with a conventional planar solar array/battery power system to assess the differences in system weight, size, and operations, Features of the design include the use of an advanced multitube, vapor anode AMTEC cell design with 24% conversion efficiency, and a direct solar insolation receiver design with integral LiF salt canisters for energy storage to generate power during the maximum solar eclipse cycle, The modular generator design consists of an array of multitube AMTEC cells arranged into a parallel/series electrical network with built-in cell redundancy. Our preliminary assessment indicates that the solar generator design is scaleable over a 500 to 2,500-W range. No battery power is required during the operational phase of the GPS mission. SAMTEC specific power levels greater than 5 We/kg and 160 We/m² are anticipated for a mission duration of 10 to 12 years in orbits with high natural radiation backgrounds     

华北管理局出台京沪航线与高铁竞合双赢措施

6月24日,民航华北管理局召集华北空管局、相关航空公司,首都机场股份公司共同研讨京沪"空中快线"与高铁竞合双赢的对策措施,并已达成12项共识。一是打造精品航线,全面提高"京沪空中快线"服务品质,尽量减少航班流控,保证航班正常率在80%以上。二是改善航班硬件设施。三是航空公司增加京沪空中快线航班公商务舱座位。四是增大航班密度,满足旅客随到随走的需求,按照京沪快线每半小时1班的原则,补充10时30分、12时30分空白时间段航班。五是调整快线航班时刻。六是航空公司安排航班计划、调配飞机时,尽量避免国际航班与快线航班接飞,避免旅客     

To an issue of rating the external loads on a helicopter with skid landing gear for landing loading condition

The existing technique of rating the external loads on a helicopter with skid type landing gear according to Airworthiness Standards [1] is analyzed and the results of comparing with design and experimental studies are presented. The main existing problems both in design simulation and the system of requirements to the conditions of rating the loads on the skid landing gear helicopter are identified. Also proposed are the techniques to increase safety of the helicopter emergency landing by refining the rating conditions of external loads at the design stage.     

Landing system verification based on petri nets and a hybrid approach

One of the most important activities of control system design is its verification. Verification ensures that the controlled system will behave as expected under any circumstances it may operate. In this context, the purpose of this paper is to introduce a new method for the verification of aircraft control systems. The focus of this method is on aircraft systems that are characterized as hybrid, i.e., that merge continuous and discrete dynamics. The method proposed is divided into two main parts: the system modeling and the verification of behavioral properties. In the first part, Petri net, differential equation systems, and object oriented concepts are used concurrently in order to model complex hybrid systems. In the second part, the distributed nature of the model is explored in order to decompose a complex verification problem into series of simple local problems. Linear logic is used as a basis of a theorem-proving approach for the verification from the discrete-event point of view. The verification method has been applied to a number of case studies. Among them is the landing system of a military aircraft, which is described in this paper     

Three-dimensional temperature prediction in cylindrical turning with large-chamfer insert based on a modified slip-line field approach

Chamfered inserts have found broader applications in metal cutting process especially in high-performance machining of hard-to-cut materials for their excellent edge resistance and cutting toughness. However, excessive heat generation and resulting high cutting temperature eventually cause severe tool wear and poor surface integrity, which simultaneously limits the optimal selection of machining parameters. In the present study, an analytical thermal–mechanical model is proposed for the prediction of the three-dimensional (3-D) temperature field in cylindrical turning with chamfered round insert based on a modified slip-line field approach. First, an innovative discretization method is introduced in a general 3-D coordinate system to provide a comprehensive demonstration of the irregular cutting geometry and heat generation zones. Then, a plasticity-theory-based slip-line field model is developed and employed to determine the intensities and geometries of every elementary heat sources in Primary Deformation Zones (PDZ), Secondary Deformation Zones (SDZ) and Dead Metal Zones (DMZ). At last, a 3-D analytical model is suggested to calculate the temperature increases caused by the entire heat sources and associated images. The maximum cutting temperature region predicted is found existing upon the chip-tool contact area rather than the tool edge. Moreover, the rationalities of cutting parameters employed are analyzed along with theoretical material removal rates and ensuing maximum cutting temperatures. The results indicate that the cutting conditions with large depth of cut and high cutting speed are more desirable than those with high feed rates. The proposed models are respectively verified through a series of 3-D Finite Element (FE) simulations and dry cutting experiments of Inconel 718 with chamfered round insert. Satisfactory agreement has been reached between the predictions and simulations as well as the measurements, which confirms the correctness and effectiveness of the presented analytical model.     

碳纳米管悬浮液强化重力型平板热管性能的实验

以带有微槽道强化传热面的小型重力型平板热管蒸发器为研究对象,以水-多壁碳纳米管(CNT)组成的纳米悬浮液为工质,在不同运行压力和不同悬浮液质量浓度下对热管蒸发器的沸腾换热特性以及临界热通量(CHF)进行了实验研究.研究证明:以水-多壁碳纳米管组成的纳米悬浮液可以明显地强化重力型平板热管蒸发器的换热特性.沸腾换热系数强化率和CHF强化率随压力降低而大幅度增加.悬浮液质量浓度对沸腾换热系数和CHF也有重要影响,在低质量浓度时,沸腾换热系数和CHF随质量浓度增加而缓慢增加.但是在质量浓度超过2.0%时,质量浓度的影响基本消失.      

基于ADN基液体推进剂的无毒可贮存空间发动机试验研究

对一台基于ADN基液体推进剂的无毒空间发动机进行了试验研究。通过三维PDA(Phase Doppler Anemometry)综合测量系统,获得了发动机喷注器的雾化性能,得到了喷注器雾化液滴空间上的双分支分布以及液滴尺寸上的双峰状分布;通过高空模拟热试车试验,对于发动机的稳态、脉冲工作性能、工作过程中包含的催化分解及燃烧反应特性有了深入理解,研究了发动机启动时燃烧室内的建压和温度抬升过程,揭示了ADN基发动机在点火过程中体现出的点火延迟特性。     

中国公务机市场仍在期待变化：与豪客比奇公司谈中国公务机市场的变化

无论从国民经济实力、还是从经济发展的需求，中国都应该能够成为世界公务机市场非常重要的一极，然而事实远非如此。在过去两年中，中国公务机市场虽有转暧的迹象，但距繁荣仍有相当距离。