MA60飞机高原机场起飞性能研究

针对我国自行研制的支线飞机———MA60飞机进行了高原机场起飞性能研究。首先建立了飞机从地面滑跑到离地后距地面10.7 m高度处数学模型,结合MA60飞机的特性,计算出其理论起飞距离、起飞滑跑距离等参数值,然后按照CCAR 25部要求,设计了试飞验证程序,并在选定的高原机场进行了试飞验证,试飞中采用双发半功率模拟单发代替单发试飞。试飞结果表明,MA60飞机可在高原机场使用5°襟翼安全起飞。     

Topological model of the solar event including a flare and coronal mass ejection on October 19, 2001

Based on the analysis of a strong solar flare X1.6/2B on October 19, 2001 in the active region 9661, accompanied by a coronal mass ejection (CME) of the halo type, a topological model of development of this solar event is suggested. The model considers a unified process of development of CME and a chromosphere flare. According to the model, this process has a common source of energy supply: the turbulent current layer lying between the arcade of flare loops and the surface of CME going away. The structures on the ends of flare bands (SEFB) represent in this model chromosphere feet of the system of large-scale coronal magnetic arches at the initial stage of the dynamic processes whose evolution results in CME. Peripheral structures (PS) of the flare (elongated double bright emission strips beyond the limits of the active region) are interpreted as chromosphere bases of magnetic field lines that form an external shell (braid) of the CME at the late stage of the flare.     

新舟60飞机敏捷制造生产模式

分析新舟60飞机目前生产模式中存在的不足,提出利用现代化管理技术及方法建立新舟60飞机敏捷制造生产模式的思路和实施方法,建议改变现行的计划经济管理模式,采用敏捷制造方式,以应对新舟60飞机的客户化和快速交付需求,提高新舟60飞机的市场反应速度,促进公司民机的大发展。     

钛合金电子束焊接表面残余应力的测试和有限元分析

采用多束电子束流焊接Ti60钛合金,并利用小孔法和有限元分析方法分别测试和模拟焊后残余应力值.对焊前预热、焊后缓冷和焊前预热+焊后缓冷三种焊接工艺下的残余应力值进行比较,研究残余应力的分布规律.研究结果表明,在垂直焊缝截面上,纵向残余应力σx的模拟结果与测试结果在变化趋势上基本一致.在平行焊缝截面上,实测与模拟纵向残余应力σx的分布规律相似.证明了有限元模型的合理性和可靠性.采用预热+焊接的焊接工艺对残余应力影响不大,采用焊接+缓冷的焊接工艺可以改变残余应力的分布.     

ZK60镁合金均匀化过程中的组织演变

采用光学显微镜、扫描电镜、能谱分析和X射线衍射研究了ZK60镁合金铸态的显微组织以及均匀化过程中的组织演变与成分分布.结果表明:ZK60铸态合金中枝晶偏析严重,在晶界和枝晶边界处存在大量的非平衡共晶相,其主要成分为α-Mg和Mg,Zn,;经过均匀化处理后,合金中的非平衡相随温度的升高和时间的延长逐渐溶解,但温度高于420℃后发生过烧,最佳均匀化处理制度为400℃/12h,该制度与均匀化动力学方程所得结果基本一致.     

三种碳物质对RDX-CMDB推进剂热分解的影响

利用压力ＤＳＣ研究了７ＭＰａ时Ｃ６０、富勒烯烟炱（ＦＳ）和炭黑（ＣＢ）对催化的ＲＤＸ－ＣＭＤＢ推进剂热分解特性的影响。结果表明：使推进剂表现分解热愈大的碳物质，则导致推进剂的燃速愈高。和参比推进剂相比，含ＦＳ的推进剂表现分解热大，故燃速也高，增速作用亦大。不同碳物质导致推进剂表观分解热增加率的大小顺序为：ＦＳ〉ＣＢ〉Ｃ６０。     

Tribological performance of hydrogenated diamond-like carbon coating deposited on superelastic 60NiTi alloy for aviation self-lubricating spherical plain bearings

It is imperative to develop a novel matching of metallic substrate and self-lubricating coating for aircraft spherical plain bearing in a wide range of service conditions. As a new type of superelastic material, 60NiTi alloy meets the performance requirements of aerospace bearing materials, but exhibits poor tribological performance, especially under the conditions of dry sliding friction. A Hydrogenated Diamond-Like Carbon (H-DLC) coating was deposited on the 60NiTi alloy to improve its tribological performance. The microstructure and mechanical behavior of the 60NiTi alloy and its H-DLC coating were explored. Results show that improvement of friction and wear performance of the H-DLC coating deposited on the 60NiTi substrate is mainly achieved by graphitization at the friction interface and the transfer film produced on the counterpart ball. The increased friction load leads to intensification of graphitization at the friction interface and formation of continuous and compact transfer film on the surface of the counterpart ball.     

Latitudinal features of Total Electron Content over the African and European longitude sector following the St. Patrick’s day storm of 2015

GNSS TEC values have been obtained from 18 stations distributed from the magnetic equator to nearly 80°N magnetic dip in the African and west-European longitude sector corresponding to the March 17–18, 2015 geomagnetic storm. Significantly depleted ionosphere have been observed at stations north of 50°N geographic on March 18, 2015 following the above storm over a longitude swath 11.9°–21°E covering the Eastern Africa and Western European longitude sector. High ROTI values were noted on March 17^th at locations around 80°N magnetic dip. Two prominent peaks in PCN were noted around 09:00 UT and 14:00 UT on March 17, 2015 and around 15:00 UT on March 18, 2015. Daytime thermospheric (O/N₂) ratio was markedly less on March 18th at latitudes above 60°N geographic which is suggested to be the major driver behind depleted high latitude ionosphere during the recovery phase of the storm on March 18, 2015.     

DC-DC电力变换器设计与实现

DC-DC是将不可调的直流电压转变为可调或固定的直流电压,是一个用开关调节方式控制电能的变换电路,这种技术被广泛应用于各种开关电源、直流调速、燃料电池、太阳能供电和分布式电源系统中。上个世纪,随着功率开关器件的发展,变换器拓扑和变换技术已经取得了很大的成就,并且已经发展到一个相当高的水平。在DC-DC变换器的演化过程中,离不开各种直流变换技术,各种新技术的产生和发展很大程度上影响了变换器拓扑的演化。本课题的目的是设计一种DC-DC电力变换器,其可将一种直流电变换为另一种形式直流电,并利用MC9S08DZ60单片机对其进行控制,主要对电压、电流实现变换,它在可再生能源、电力系统、交通、航天航空、计算机和通讯、家用电器、国防军工、工业控制等领域有广泛的应用。     

建国60年来我国高职教育的回顾与展望

建国60年来，我国高职教育从无到有，从弱到强，经历了孕育产生、地位确立和类型确立三个发展阶段，实现了跨越式发展，取得了举世瞩目的成就。回顾我国高职教育60来年产生和发展的历程，展望未来发展的趋势，对于当前的高职教育教学改革具有十分重要的理论和现实意义。