新一代运载火箭分离系统可靠性设计方法研究（英文）

The LM-5B carrier rocket is a new-generation large-scale launch vehicle developed for space station launch missions. Its separation system includes fairing separation, space station module-rocket separation, and booster separation. The separation systems play an important role in the design of launch vehicles, and any failure during the separation process would affect the final completion of rocket flight mission. This paper presents the reliability design and analysis for the LM-5B carrier rock...     

GF-4 Completed Multiple Tests

<正>Recently,the mechanical test and satellite-launch vehicle matching and separation test for the flight model GF-4satellite was completed,laying a robust foundation for future testing work.GF-4 is China’s first geostationary medium and high-resolution optical imaging remote sensing satellite,as well as the first satellite based on the newly developed high orbit remote sensing satellite platform.The success of these     

Applications of Magnesium Alloys in Aerospace and Aviation

Magnesium alloys are well applied in aerospace and aviation because of their mass saving potential, good electromagnetic shielding performance, and high damping capacity. To further promote the applications, in this paper, the applications of magnesium alloys are reviewed, which could provide insights for researchers and application designers. Firstly, the applications in aerospace are reviewed, including missile, satellite, rocket, and spacecraft. Secondly, the applications and commercial magnesium alloys in aviation are summarized. Thirdly, the bottleneck and existing problems for such magnesium alloys applied in aerospace and aviation are discussed. The requirements for the magnesium alloy performance in aerospace and aviation are evaluated and elaborated.     

Xichang SatelliteLaunch Center

This paper describes the unique environment and the facilities in Xichang Satellite Launch Center. Its climate and geographical features are suitable for launching geostationary satellites.There are two launch complexes in this site. One is the Long March 3 launch complex which is theAerospace China/Summer 1992fixed and 77m high launch tower. It has successfully launched 7 satellites. Another is the Long March 2E launch complex which is composed of a 97m mobile tower and a 74m fixed tower. The first use of this complex was in July, 1990 when Long March 2E made the maiden test flight.The technical test, satellite assembling and other neccessary facilities in this launch site are introduced here.     

Analysis on the Bonding Failure Mechanism of High Modulus Carbon Fiber Composites

In order to explore the bonding failure mechanism of high modulus carbon fiber composite materials, the tensile experiment and finite element numerical simulation for single-lap and bevel-lap joints of unidirectional laminates are carried out, and the stress distributions, the failure modes, and the damage contours are analyzed. The analysis shows that the main reason for the failure of the single-lap joint is that the stress concentration of the ply adjacent to the adhesive layer is serious owing to the modulus difference, and the stress cannot be effectively transmitted along the thickness direction of the laminate. When the tensile stress of the ply exceeds its ultimate strength in the loading process, the surface fiber will fail. Compared with the single-lap joint, the bevel-lap joint optimizes the stress transfer path along the thickness direction, allows each layer of the laminate to share the load, avoids the stress concentration of the surface layer, and improves the bearing capacity of the bevel-lap joint. The improved bearing capacity of the bevel-lap joint is twice as much as that of the single-lap joint. The research in this paper provides a new idea for the subsequent study of mechanical properties of adhesively bonded composite materials.     

非接触式自动沉孔测量的机器视觉（英文）

The slug rivet is widely used in wing assembly due to its longer fatigue life and better sealing performance compared with other connection technologies. As a countersink with dual-angle is widely adopted for this type of connection, the countersink diameter and depth are key factors that affect assembly quality. Therefore, it is of great importance to efficiently inspect the countersink quality to ensure high accuracy. However, contact measurements are susceptible to the loss of accuracy due to...     

Repair Welding of Casting Magnesium Alloys： A Review

Magnesium (Mg) alloys have broad application prospects in the fields of aerospace, national defense, and military industries, owing to their advantages of high specific strength and stiffness, good damping properties, and excellent castabilities. However, defects such as oxidation inclusions, shrinkage cavities and porosities, and hot cracks are readily generated in Mg alloy components, which seriously reduce the performance stability of the products. Related repair welding technologies for Mg alloys can greatly reduce the rejection rate and production cost, and exhibit significant value in scientific research and engineering application. In this review, the weldability of Mg alloys is introduced firstly according to their physical and chemical properties. Then, various repair welding technologies and pre-weld treatments applicable to Mg alloys are systematically summarized, and the effects of welding parameters as well as heat treatments on the microstructure and performance of the repaired joints are clarified. Finally, the existing problems and development trends of repair welding technologies for Mg alloys are summarized based on the actual engineering application requirements.     

FY-2F Meteorological Satellite and Its Applications

China is one of the countries in the world claiming the most occurrences of severe natural disasters. The natural disasters occurring in this country, diversify in type, wide in geographic distribution, high frequency of occurrence, and bring heavy losses in terms of people’s lives and properties. As     

运载火箭自主动态轨迹优化控制的进展（英文）

This paper first introduces the technical requirements for autonomous flight, with a brief review of the International Academy of Astronautics(IAA) study group, “autonomous dynamic trajectory optimization control of launch vehicle”. Two research scenarios, ascent rescue and powered descent, are compared from the viewpoint of optimal control. On this basis, the technologies on the autonomous trajectory planning and control under the thrust-drop failures in the ascending phase, and the autonomous guidance method during the powered landing for the recovery of the rockets are discussed respectively. For the ascending problem, the characteristics of different solutions, including the iterative guidance method(IGM)-based residual carrying capacity evaluation, the state-triggered indices(STI), the joint planning with the payload's performance, and the multiple graded optimization(MGO), are analyzed for comparison. For the landing problem, the challenges such as the feasible region reduction caused by high thrust weight ratio(HTWR) and the disturbance adaptability brought by the limited feasible region, are studied in detail, as well as the onboard planning demonstration flight in China are introduced. Finally, the foundations supporting the above methods are summarized, which play an important role in promoting the flight autonomy.     

A Hot Air Balloon Drop Test on the Decelerated Aerostat System Achieved Success

<正>A hot air balloon drop test on the decelerated aerostat system was conducted by the Beijing Institute of Space Mechanics and Electricity,CAST successfully.The test verified the overall design concept of the decelerated aerostat system and the critical links including parachute opening,module separation,stretching of parachute and balloon capsule separation and tested the working performance of parachute and balloon during stretch process achieving success.During the     

SJ-9A/B Satellites Conduct Key Technology Tests

On October 14, two satellites SJ-9A/B were sent into their preset orbits by a LM-2C/SMA launch vehicle, which is the first flight of a series of China’s civilian technology experimental satellites. SJ-9A and B are the first two satellites in the series of civilian technology experimental satellites designed for tests such as long lifetime and high reliability, high precision and high performance of satellite, domestically developed core components, satellite formation and     

A Robotic TeleoperationSystem for Precise Robotic Manipulation by Human-Machine Interaction

Teleoperation is of great importance in the area of robotics， especially when people are unavailable in the robot workshop. It provides a way for people to control robots remotely using human intelligence. In this paper， a robotic teleoperation system for precise robotic manipulation is established. The data glove and the 7-degrees of freedom (DOFs) force feedback controller are used for the remote control interaction. The control system and the monitor system are designed for the remote precise manipulation. The monitor system contains an image acquisition system and a human-machine interaction module， and aims to simulate and detect the robot running state. Besides，a visual object tracking algorithm is developed to estimate the states of the dynamic system from noisy observations. The established robotic teleoperation systemis applied to a series of experiments， and high-precision results are obtained， showing the effectiveness of the physical system.     

LM-5 Booster Separation Test Achieved Success

LM-5 booster separation test achieved success in Tianjin new generation launch vehicle industrial base on May 31. The test mainly demonstrated whether the boosters can separate from the rocket safely during the flight, the correctness of the design of separation system and its reliability. Many important parameters including separation     

Recent Developments on Damage and Fracture of Thin-Walled Complex Components Produced by Spinning

The spinning technique has been widely used in the manufacture of aerospace thin-walled axisymmetric components because of its excellent formability. Damage and fracture, as the important defects that often occur and must be avoided in the forming and service stages of components, have attracted much attention of researchers. In this paper, the fracture behavior and laws of spinning components such as conical parts, tubular parts, and components with inner ribs are summarized, the typical coupled and uncoupled ductile fracture models are introduced, and their applications in spinning are analyzed. Meanwhile, the recent developments on the modified ductile fracture model in analyzing damage and fracture mechanisms of spinning are emphatically introduced. The results could provide guidance for the selection and establishment of appropriate ductile fracture models in the finite element simulation for the accurate prediction and analysis of fracture moment, location, form, damage mechanism, and evolution law, and help the development of precision spinning techniques for high-performance thin-walled complex components.     

Imagery Data Quality of ZY Satellite Reached International Level

The in-orbit commissioning of ZY-1 02C satellite is proceeding smoothly. According to the relevant experts in this field, the imagery quality of the satellite has reached or nearly reached the level of international satellites of the same kind. ZY-1 02C satellite and ZY-3 satellite were successfully launched on December 22, 2011 and January 9, 2012 respectively. China Centre for Resources Satellite Data andApplication (CRSDA) was responsible for the building of a ground processing     

China Aerospace Corporation Set Up

The inaugural meeting of China Aerospace Corporation(China National Space Administration)was held inBeijing on June 6,1993.Mr Liu Huaqing,a member of the Standing Committee of the Political Bureau of theCentral Committee of CPC and the Vice-Chairman of the Central Military Commission,Mr.Song Jian,a statecouncillor and some other high officials attended the meeting and offered their congratulations. According to the plan for adjusting the organizational structure of the State Council approved by the EighthNational People's Congress,the former Ministry of Aerospace Industry has been restructured into the Aviation     

大功率霍尔电推进研究进展（英文）

High power Hall electric propulsion technology is a very competitive electric propulsion technology for future large space missions such as large GEO satellites, manned space programs, deep space explorations, cargo ships, space tugs. Based on the experience of more than 20 years in research and development of Hall electric propulsion, the Shanghai Institute of Space Propulsion(SISP) has developed 3 high power Hall thrusters, i.e., the 10 kW class HET-500, 20 kW class HET-1000, and 50 kW class HET-3000. This paper presents the development status of the high power( ≥ 10 kW) Hall electric propulsion at SISP, including tests of 3 high power Hall thrusters in the power range from 10 kW to 50 kW, the qualification of a single string of a 10 kW Hall electric propulsion system, and the study of a cluster of two 1.35 kW HET-80 Hall thrusters to understand the technical issues related to multi-thruster high power electric propulsion systems.     

Linear Shaped Charge Cutting Property and Charge Cutting Mechanism of Mg-Gd-Y-Zn Alloy

The linear shaped charge cutting technology is an effective technology for aircraft separation. It can separate invalid components from aircrafts timely to achieve light-weight. Magnesium alloy is the lightest metal material, and can be used to cast effective light-weight components of an aircraft construction. However, the application study of the linear shaped charge cutting technology on magnesium alloy components is basically blank. In response to the demand for the linear separation of magnesium alloys, the Mg-12Gd-0.5Y-0.4Zn alloy is selected to carry out the target shaped charge cutting test. The effects of the shaped charge line density, cutting thickness, and mechanical properties on the cutting performance of the alloy are studied. The shaped charge cutting mechanism is analyzed through the notch structure. The results show that the linear shaped charge cutting performance is significantly affected by the penetration and the collapse. The higher the linear density is, the stronger the ability of the linear shaped charge cutter is, and the greater the penetration depth is, which is advantageous. However, the target structure will be damaged when it is too large (e.g., 4.5 g?m-1). Within 12 mm, when the cutting thickness of the target increases, the penetration depth increases. The lower the tensile strength is, the greater the penetration depth is, and the more conducive the penetration depth to the shaped charge cutting is. When the elongation (EL) increases to 12%, the collapse of the target is incomplete and the target cannot be separated. When the tensile strength of the Mg-Gd-Y-Zn alloy is less than 350 MPa, the EL is less than 6.5%, the cutting thickness is less than 12 mm, and the linear shaped charge cutting of the magnesium alloy can be achieved stably.     

Maiden Launch of Satellites for Global Bei Dou System Achieved Success

<正>At 19:45 Beijing time on November 5,a LM-3B/Yuanzheng 1 launch vehicle lifted off from the Xichang Satellite Launch Center,putting the first two Bei Dou 3 satellites into orbit after the separation of the rocket upper stage and the satellites.The launch opens up a new era for the global networking of the Bei Dou Navigation Satellite system(Bei Dou system),which is the final step of the"three-step development strategy"of the system.     

11th Five-Year Plan For Space Development Issued

On October 18,2007,the Commission of Science,Technology and Industry for National Defense(COSTIND)issued the 11th Five-Year Plan for Space Development approved by the State Council,the first complete development plan of China in space field.The plan puts forward the guidelines,development objectives and major tasks for China's space industry during the 11th Five-Year Plan period,and defines 9 major missions including manned spaceflight program,lunar exploration program,high resolution Earth observation system,Beidou satellite navigation system,new generation launch vehicle program.