Hypersonic vehicle aerodynamic design using modified sequential approximate optimization

Hypersonic vehicles are receiving increased attention within the aerospace community due to their high cruise speed and long-range capabilities. In this paper, a modified Sequential Approximate Optimization method is proposed for an optimized aerodynamic design of a hypersonic vehicle. As part of this approach, a constrained experimental design method is developed to handle the constraints more efficiently. A radial basis function is used to surrogate time-consuming CFD analysis. An efficient and more robust numerical mesh morphing scheme for the hypersonic vehicle is developed for the generation of high-quality meshes. Within this paper, a novel adaptive infilling strategy is proposed which uses an inaccurate search technique coupled with an elite archive. This allows the location of a more promising sample region and hence improves the surrogate accuracy, thereby further enhancing the optimization efficiency. A hypersonic vehicle aerodynamic design problem is solved using the proposed approach and satisfactory results are obtained at much lower computational costs. The lift-to-drag ratio is increased by 23.8% when compared with the base configuration while also satisfying the volume and lift constraints. The pressure and Mach contours have been compared with those of the base configuration and the results demonstrate the strength of the optimized configuration. The modified sequential approximate optimization for designing an improved hypersonic vehicle is worth referencing in future work.     

人机标准陆空通话系统

陆空通话是航指挥的基本功，它为航管人员与飞行员信息勾通架起一座桥梁。本文介绍利用计算机多媒体技术开发的人机标准陆空通话自学习系统，它可以根据学员自身的学习效果，控制学习进度。该系统可以有效地促进、提高学员的听说能力。     

草酸阳极氧化新工艺及其应用

采用硫酸－草酸复合阳极氧化工艺，即在草酸阳极氧化前在硫酸溶液中氧化若干分钟，以避免零件发生烧蚀现象，同时能够提高草酸溶液的耐氯离子能力，而且适用于含铜铝合金。草酸溶液中添加１～５ｍＬ／Ｌ甲酸，可以消除氧化膜中的小白点现象。     

教学新摸式在专项课教学中的运用

本文主要阐明了新的教学模式在专项课教学中的运用,并对新模式的结构及运用作了分析。通过讨论讲述了新模式的优势,并提出运用新模式的具体要求。     

应用微机校定三相变压器的联结组及标号

三相变压的联结组标号对其正常运行极为重要，必须校定，而目前变还缺少全面快捷的校定方法和设备。本文介绍采用微机系统来实现联结组桔的校定，首先把四类联结组差别区分开，然后分析指出同一类联结组中，除有六种正序标号外，存在六种逆序标号，提出用新的筛选法能简捷地判别校定同一类的十二种标号，当微机系统进行实际测试时，必须考虑电源电压三相不对称程序的影响，故经数学推导得出用实测计算值代替理想计算值作判别比较的基     

制造公差是影响螺旋弹簧刚度和弹力的主要因素

分析了弹簧的几何尺寸制造公差对其刚度和弹力的影响。     

PROBLEMS OF WINDBLAST

ＰＲＯＢＬＥＭＳＯＦＷＩＮＤＢＬＡＳＴＺｈａｎｇＹｕｎｒａｎ；ＷｕＧｕｉｒｏｎｇ（ＩｎｓｔｉｔｕｔｅｏｆＳｐａｃｅＭｅｄｉｃｏ－Ｅｎｇｉｎｅｅｒｉｎｇ，Ｂｅｉｊｉｎｇ，Ｃｈｉｎａ，１０００９４）ＰＲＯＢＬＥＭＳＯＦＷＩＮＤＢＬＡＳＴ￥ＺｈａｎｇＹｕｎ...     

Dissipative Solitary Kinetic Alfvén Waves and Electron Acceleration in the Solar Corona

Nonthermal electrons play a major role during solar flares since not only they contain a large amount of the released energy but also they provide important information of the flaring physics through their nonthermal radiation in radio and hard X-ray bands. In a recent work Wu (Phys. Plasmas 10 (2003) 1364) proposed that dissipative solitary kinetic Alfvén wave (DSKAW) with a local shock-like structure could provide an efficient acceleration mechanism for energetic electrons in a low-β plasma. In the present paper dynamical characteristics of the DSKAW acceleration mechanism in solar coronal plasmas are studied and its application to the acceleration of flaring electrons is discussed.     

Cloud profiling radar for the CloudSat mission

The Cloud Profiling Radar (CPR) for the upcoming CloudSat Mission is a spaceborne 94-GHz nadir-looking radar that measures the power backscattered by clouds as a function of distance from the radar. This sensor is expected to provide cloud measurements at a 500-m vertical resolution and a 1.5 km horizontal resolution. CPR will operate in a short-pulse mode and will yield measurements at a minimum detectable sensitivity of -28 dBZ.