空天飞行器制导控制技术研究进展与展望

本文在简要介绍空天飞行器制导控制技术发展情况基础上，针对其典型的任务形态给制导控制技术带来的挑战，分别从动力学建模、轨迹优化与制导、飞行控制与导航等四个方面阐述了制导控制技术中面临的关键技术，并探讨了空天飞行器制导控制技术后续发展方向与思路。     

反向工程中模型重构技术的特点及比较

阐述了反向工程中模型重构的几种方法，对其特点进行了比较，得出了有关结论，并对模型重构技术今后研究方向和难点问题进行了讨论。     

An aviation oxygen supply system based on a mechanical ventilation model

At high altitudes, an Aviation Oxygen Supply System(AOSS) protects pilots from low pressure and hypoxia by continuously providing oxygen corresponding to the pilots' dynamic respiratory properties.An AOSS mainly consists of oxygen supercharging machines which are used in a high-altitude flight cabin to supply pressurized oxygen to pilots.Therefore, it is of great significance to study the airflow dynamic characteristics of an AOSS for safe, continuous, and efficient oxygen supply.In this paper, an AOSS is firstly simplified and considered as a mechanical ventilation system.Then, its corresponding mathematical model is constructed.Next, to verify the mathematical model, a prototype AOSS with a lung simulator is proposed for an experimental study.Afterwards, to build a foundation for the optimization of the AOSS, the airflow dynamic characteristics of an aircraft are analyzed, and the effects of key parameters on the respiration system are researched.Through experimental and simulation studies, it can be concluded that the mathematical model is effective.Subsequently, for stability during the respiration process, we consider setting the equivalent throttling areas of the inspiration and expiration pipelines smaller within certain limits; additionally, an excessively high oxygen supply pressure will disturb smooth airflow, and in a low-pressure environment, the pressure can be 84 cm H_2O lower than the standard atmospheric pressure.This research can be referred to in the design of an oxygen supply system and the study on optimization of airflow dynamic characteristics.     

利用OpenGL建立运动目标体素模型的方法

三维体素模型的建立是运动目标序列图像产生的基础和关键步骤，三维体素模型就是利用计算机系统将运动目标的几何特性在计算机显示器上直观地表示出来。介绍了应用SGI公司的OpenGL三维图形库和微软的MFC基类库在VC 5.0的编程环境中建立运动目标三维体素模型的方法和过程，并以较复杂的静态飞机模型为例进行了模拟实现，得到较好的效果。     

UG13环境下小型钛合金叶轮的造型方法

阐述了利用ＵＧ１３平台，对小型钛合金叶轮的造型方法。并且针对加工小型钛合金整体叶轮过程中变形和回弹的问题，提出了在造型阶段就主动控制负余量的软件补偿方法。该造型及软件补偿方法在航空某型任务小型钛合金叶轮制造中得到应用     

A new narrow beam Doppler radar at 3 MHz for studies of the high-latitude middle atmosphere

A Doppler radar at 3.17 MHz has been installed at Saura close to the Andøya Rocket Range as part of the ALOMAR observatory at Andenes, Norway in summer 2002 to improve the ground based capabilities for measurements of small scale features and turbulence in the mesosphere. The main feature of the new Saura MF radar is the transmitting/receiving antenna which is arranged as a Mills Cross of 29 crossed half-wave dipoles with a minimum beam width of about 7°. Each dipole is fed by its own transceiver, and the individual phase control of the 58 transceiver modules on transmission and reception provides high flexibility in beam forming and pointing as well as transmission switching between ordinary and extraordinary mode circular polarisation. In addition, beams with different widths at the same pointing angle can be formed. For multiple receiver applications (spaced antenna wind measurements, all-sky meteor detections) four independent receiving channels are available.     

CAE技术在工程设计中的应用

本文介绍了602所应用CAE技术的现状,并介绍了应用有限元法进行结构分析的经验,和应用先进的CAE技术的体会,指出了工程应用中的不足,展望了CAE技术的应用前景。     

Operational modal analysis via image based technique of very flexible space structures

Vibrations represent one of the most important topics of the engineering design relevant to flexible structures. The importance of this problem increases when a very flexible system is considered, and this is often the case of space structures. In order to identify the modal characteristics, in terms of natural frequencies and relevant modal parameters, ground tests are performed. However, these parameters could vary due to the operative conditions of the system. In order to continuously monitor the modal characteristics during the satellite lifetime, an operational modal analysis is mandatory. This kind of analysis is usually performed by using classical accelerometers or strain gauges and by properly analyzing the acquired output. In this paper a different approach for the vibrations data acquisition will be performed via image-based technique. In order to simulate a flexible satellite, a free flying platform is used; the problem is furthermore complicated by the fact that the overall system, constituted by a highly rigid bus and very flexible panels, must necessarily be modeled as a multibody system. In the experimental campaign, the camera, placed on the bus, will be used to identify the eigenfrequencies of the vibrating structure; in this case aluminum thin plates simulate very flexible solar panels. The structure is excited by a hammer or studied during a fast attitude maneuver. The results of the experimental activity will be investigated and compared with respect to the numerical simulation obtained via a FEM-multibody software and the relevant results will be proposed and discussed.     

Multi-disciplinary design optimization with variable complexity modeling for a stratosphere airship

This paper proposes a hybrid architecture based on Multi-disciplinary Design Optimization(MDO) with the Variable Complexity Modeling(VCM) method, to solve the problem of general design optimization for a stratosphere airship. Firstly, MDO based on the Concurrent SubSpace Optimization(CSSO) strategy is improved for handling the subsystem coupling problem in stratosphere airship design which contains aerodynamics, structure, and energy. Secondly, the VCM method based on the surrogate model is presented for reducing the computational complexity in high-fidelity modeling without loss of accuracy. Moreover, the global-to-local optimization strategy is added to the architecture to enhance the process. Finally, the result gives a prominent stratosphere airship general solution that validates the feasibility and efficiency of the optimization architecture. Besides, a sensitivity analysis is conducted to outline the critical impact upon stratosphere airship design.     

扩频信号声光相关解调技术

声光相关技术在检测宽带微弱信号中有很大的潜力，提出在射频上用声光相关器对扩频信号做相关运算的方案，给出扩频信号的快速捕获、精密跟踪和信息解调的方法，并设计了实验系统，结果得到了验证。