China Academy of Launch Vehicle Technology

Beijing, China

China Academy of Launch Vehicle Technology

Beijing, China

The China Academy of Launch Vehicle Technology is the premier space launch vehicle manufacturer in China and one of the major launch service providers in the world. CALT is a subordinate of the larger China Aerospace Science and Technology Corporation . It was established in 1957 and is headquartered in the southern suburbs of Beijing.CALT is state-owned but is not actively state managed; its organization and orientation are comparable to Western defence and space contractors. Its major contribution to Chinese launch capability has been the manufacture of the Long March family of rockets. CALT has 27 000 employees and at least 13 research facilities. Wikipedia.

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Wang S.,China Academy of Launch Vehicle Technology
Proceedings of the International Astronautical Congress, IAC | Year: 2016

Space debris removal is a costly project. Commercial operation provides a sustainable way of implementation. According to principles governing the activities of states in the exploration and use of outer space, several basic issues, such as ownership of space debris, rights and liability of active removal, should be taken into consideration primarily. Business model, financial incentives and acquisition of orbital position ownership after removal are core contents of commercial exploitation. For instance, with regards to those geosynchronous orbital positions with commercial value, "who removes who owns" principle could be taken into account to encourage business activity. In addition, when authorization of orbital position expires and owner of the satellites do not remove within a definite time, international cooperation or removal service transaction would be feasible and operable measurements. This paper focus on discussing and trying to clarify those basic issues mentioned above and detailed crucial business applications.

News Article | October 6, 2016

China has expressed an interest in space tourism, seriously investing in the industry starting with the largest spaceplane in the world. China Academy of Launch Vehicle Technology is working on an enormous spaceplane, which when ready will be capable of transporting up to 20 people to space. This number is the highest recorded of passengers accommodated by a commercial spaceflight company. The state-owned company has started on the project by designing a one-piece spaceplane, which will eventually be built to carry even more passengers. Academy rocket scientist Lui Haiquang spoke of the project on an event in Mexico. The team has already proposed two prototype designs of the commercial rocket plane. The first has 10 tons, and will be followed by a more complex prototype of 100 tons. The first rocket is designed to fly up to 62 miles high — at the official line that marks the beginning of space travel — while the second prototype will go 19 miles farther. "The vehicle will take off vertically like a rocket and land on the runway automatically without any ground or on-board intervention," according to Han Pengxin, the academy team leader. The rocket plane will burn liquid oxygen and liquid methane. Some members of the scientific community, however, are skeptical about how realistic these plans are. Roger Launius, spaceflight expert and former NASA cheif historian, believes that the project is an "interesting initiative" but is also concerned that it lacks technical details. "The most unusual part is the belief that they can send up to 20 people to 100 kilometers and more on a rocket without a mother ship and no staging, reusing it some 50 times. It's not explained how that will be accomplished. And the fact that they think they can test fly in the next 2 years is remarkable," Launius said. The Chinese company is not the only one to invest in commercial space travel. SpaceShip Two of Virgin Galactic will also transport passengers into space, but no more than six at a time. And so will Blue Origin, whose project New Shepard is already scheduled for flight tests. However, the Chinese project is significantly more ambitious, aiming to satisfy the increasing number of common people interested in such travel experiences. The space tourism industry isn't only constantly growing due to the large number of projects that are currently under development, but also because of the people willing to visit space who are going to have a large spectrum of choices once these projects will be released to the public. The Chinese rocket is to be finished in no more than two years, since "almost all of the ground tests have been finished and all the subsystems of the test vehicle worked very well," said Han. © 2017 Tech Times, All rights reserved. Do not reproduce without permission.

Wang C.,Beihang University | Qiu Z.,Beihang University | Wu D.,China Academy of Launch Vehicle Technology
Science China: Physics, Mechanics and Astronomy | Year: 2014

Based on the combination of stochastic mathematics and conventional finite difference method, a new numerical computing technique named stochastic finite difference for solving heat conduction problems with random physical parameters, initial and boundary conditions is discussed. Begin with the analysis of steady-state heat conduction problems, difference discrete equations with random parameters are established, and then the computing formulas for the mean value and variance of temperature field are derived by the second-order stochastic parameter perturbation method. Subsequently, the proposed random model and method are extended to the field of transient heat conduction and the new analysis theory of stability applicable to stochastic difference schemes is developed. The layer-by-layer recursive equations for the first two probabilistic moments of the transient temperature field at different time points are quickly obtained and easily solved by programming. Finally, by comparing the results with traditional Monte Carlo simulation, two numerical examples are given to demonstrate the feasibility and effectiveness of the presented method for solving both steady-state and transient heat conduction problems. © 2014 Science China Press and Springer-Verlag Berlin Heidelberg.

Zhi W.,Dalian University of Technology | Qiang Q.,China Academy of Launch Vehicle Technology | Zhanjun W.,Dalian University of Technology | Guodong S.,Dalian University of Technology
Materials and Design | Year: 2011

In the present work, the thermal shock resistance of the ZrB2-SiC-ZrC ceramic was estimated by the water quenching method and the flexural strength of the quenched specimen was measured. The measured critical temperature difference of the ZrB2-SiC-ZrC ceramic was significantly greater than that of the ZrB2-15vol.% SiC ceramic. The improvement in thermal shock resistance was attributed to its higher fracture toughness (6.7MPam1/2) and lower flexural strength (526MPa) relative to the ZrB2-15vol.% SiC ceramic (4.1MPam1/2 and 795MPa) based on Griffith fracture criterion. Furthermore, the temperature and thermal stress distributions in the specimen during instantaneous water quenching were simulated by Finite element analysis. © 2011 Elsevier Ltd.

Zhanjun W.,Dalian University of Technology | Zhi W.,Dalian University of Technology | Qiang Q.,China Academy of Launch Vehicle Technology | Guodong S.,Dalian University of Technology
Corrosion Science | Year: 2011

In the present work, isothermal oxidation of a ZrB2-(20 vol.%) SiC-(6 vol.%) ZrC (ZrB2-SiC-ZrC) ceramic was carried out at a constant temperature of 1600±15°C in static air, and the microstructures of the surface and fractured surface of the oxidised specimen were observed using SEM. The change curve of weight change/unit area with increasing oxidation time was composed of four stages according to the increase in the oxidation time: initial, middle, middle-late and late. In the different stages, a mathematical model was formulated to interpret the oxidation behaviour of the ZrB2-SiC-ZrC ceramic at high temperature. © 2011 Elsevier Ltd.

Xu B.,Northwestern Polytechnical University | Xu B.,Nanyang Technological University | Huang X.,China Academy of Launch Vehicle Technology | Wang D.,Nanyang Technological University | Sun F.,Tsinghua University
Asian Journal of Control | Year: 2014

In this paper, the robust adaptive controller is investigated for the longitudinal dynamics of a generic hypersonic flight vehicle. The proposed methodology addresses the issue of controller design and stability analysis with respect to parametric model uncertainty and input saturations for the control-oriented model. The velocity and attitude subsystems are transformed into the linearly parameterized form. Based on the parameter projection estimation, the dynamic inverse control is proposed via the back-stepping scheme. In order to avoid the problem of "explosion of complexity," by introducing a first-order filtering of the synthetic input at each step, the dynamic surface control is designed. The closed-loop system achieves uniform ultimately bounded stability. The compensation design is employed when the input saturations occur. Simulation results show that the proposed approach achieves good tracking performance. © 2013 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society.

Zhu C.,China Academy of Launch Vehicle Technology | Ni J.,Harbin Engineering University
Proceedings - 6th International Conference on Internet Computing for Science and Engineering, ICICSE 2012 | Year: 2012

Differential Evolution (DE) is one of the current best evolutionary algorithms. It becomes important in many fields such as evolutionary computing and intelligent optimization. At present, DE has successfully been applied to diverse domains of science and engineering, such as signal processing, neural network optimization, pattern recognition, machine intelligence, chemical engineering and medical science. However, almost all the DE-related evolutionary algorithms still suffer from the problems such as premature convergence, slow convergence rate and difficult parameter setting. To overcome these drawbacks, we propose a novel Cloud Model-Based Differential Evolution Algorithm (CMDE) in which the pheromone and the sensitivity model of free search algorithm replaces the traditional roulette wheel selection model. The model incorporates Opposition-Based Leaning (OBL) to present an improved artificial bee colony algorithm. Experimental results verify the superiority of CMDE is over several state-of-the-art evolutionary optimizers. © 2012 IEEE.

Zhao J.,China Academy of Launch Vehicle Technology
Journal of Thermal Science | Year: 2015

In this paper the liquid argon nanojet break-up phenomenon was studied using the molecular dynamics method. The effects of temperature, nozzle diameter and body force on the nanojet break-up length and time were simulated. Meanwhile, the particle size, wave length and the frequency of the disturbance were compared with the results of linear stability analysis. The results showed that even though the fluid becomes discontinuous, the traditional linear stability analysis can be used to make a rough calculation of the nanojet break-up. © 2015, Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag Berlin Heidelberg.

Hong B.,China Academy of Launch Vehicle Technology | Xin W.-Q.,China Academy of Launch Vehicle Technology
Proceedings of the 30th Chinese Control Conference, CCC 2011 | Year: 2011

Based on hp-adaptive pseudospectral method, this paper presents a new optimal control method to solve the rapid gliding trajectory optimization. In order to meet the speed and precision requirements, this new theory combines the global pseudospectral method with the finite element method, adopts double layer optimization strategy to adjust adaptively the segment breaks and the polynomial degree in each segment. The simulation based on hp-adaptive pseudospectral method is carried out, the result is validated by Pontryagin minimum principle, and compared with the result of Gauss pseudospectral method. The results show that the algorithm is robust, has fast convergence and not sensitive to the initial control values. The method in this paper has a great value in the practical applications. © 2011 Chinese Assoc of Automati.

News Article | February 10, 2016

As China continues to claim more land for itself in Southeast Asia, its rocket program also continues to progress forward for future missions into space. The country's first mass-produced rocket, the Long March 5 (LM 5), will officially take off in September this year after completing a final round of tests. True to its namesake, the LM 5 measures nearly 187 feet tall and is about 16.4 feet in diameter. Currently, it is China's most technologically advanced rocket and it even uses a non-toxic and pollution-free propellant. Just because it's more environmentally friendly than most rockets, however, doesn't mean it doesn't pack in the power to haul huge payloads into space. "Boasting a liftoff weight of around 800 metric tons, it will have a maximum payload capacity of 25 metric tons in the low Earth orbit and 14 metric tons in geosynchronous transfer orbit - roughly comparable to those of the United States' Delta IV and Atlas V," describes the China Daily. The rocket was tested for over 130 days at a new coastal launch facility in Wenchang, China. According to Li Dong, the head of the LM 5 project and senior designer at the China Academy of Launch Vehicle Technology, there were over 300 engineers working around the clock to make sure it passed the China National Space Administration's standards. The results of the said test will be used to further improve the technology in the LM 5, which will be made by the Tianjin Long March Launch Vehicle Manufacturing Company in Northern China. From there, the rocket will get shipped by sea back to Wenchang. When the LM 5 becomes fully operational, China's launch capabilities would increase by 2.5 times in terms of payload to support its ambitious space missions in the future. Some of its upcoming space projects where the LM 5 will come in useful include launching multiple modules into space for the future China Space Station. The first major module is expected to launch in 2018 while the rest of the space station will be completed in 2023.

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