Shanghai Institute of Spacecraft Equipment

Shanghai, China

Shanghai Institute of Spacecraft Equipment

Shanghai, China

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Qin W.,Harbin Institute of Technology | Pan Y.,Shanghai Institute of Spacecraft Equipment
RSC Advances | Year: 2015

Electron irradiation in outer space causes severe damage to the polymer materials of spacecrafts. An effective approach to prevent such damage is to incorporate nanoparticles into the polymeric materials. Herein, we fabricated modified cyanate ester (CE) and carbon/CE composites by the incorporation of reduced graphene oxide-TiO2 (rGO-TiO2) nanoparticles and studied their resistance performance to electronic radiation. Compared with the carbon/TiO2/CE composite, the interlayer shear strength of the resulting carbon/rGO-TiO2/CE composite increased by 10.4% and its mass loss reduced by 16.5%. Scanning electron microcopy (SEM) images showed that there are more cracks at the fiber and resin interfaces of carbon/CE than at the interfaces of carbon/rGO-TiO2/CE after irradiation. X-ray photoelectron spectroscopy (XPS) investigation showed that irradiation with 160 keV electrons could break the chemical bonds at the surface layer of the pristine CE resin, which is effectively prevented by the incorporation of rGO-TiO2 nanoparticles. © The Royal Society of Chemistry 2015.


Zhou Z.Y.,Beijing Institute of Technology | Liu J.H.,Beijing Institute of Technology | Tang C.T.,Beijing Institute of Technology | Li Z.J.,Shanghai Institute of Spacecraft Equipment
Jisuanji Jicheng Zhizao Xitong/Computer Integrated Manufacturing Systems, CIMS | Year: 2014

Aiming at the problem of difficult process data management resulting from the instability of assembly process in complex product's development, an implemented assembly process technology for product's development was proposed, which realized the control and management for assembly process information based on workflow. The complex product's assembly process execution and feedback business process was analyzed, and the widely existing reverse process flow was classified and defined primarily. On this basis, the workflow technology was introduced to establish the process models of assembly process design and process feedback information. The connotation of implemented process was elaborated and the generation algorithm of implemented process was designed. The assembly process tree model was constructed and the relevant software was developed which was applied in Beijing spacecraft manufacturing factory. The generation and integrated management of implemented assembly process information were achieved and the feasibility of the method was validated.


Wang Z.,University of Chinese Academy of Sciences | Zhao K.,Shanghai Institute of Spacecraft Equipment | Chen W.,Shanghai Institute of Spacecraft Equipment | Chen X.,Shanghai Institute of Spacecraft Equipment | Zhang L.,University of Chinese Academy of Sciences
Applied Thermal Engineering | Year: 2013

Tungsten is remarkable for its robustness; especially it has the highest melting point of all the non-alloyed metals. Tungsten and tungsten alloys have been widely used in aerospace, weapon, nuclear industries and fusion reactor. Tungsten is expected to become fusion reactor first wall material for this reason. In this paper, phase transformation processes of fusion reactor first wall material tungsten have been investigated via molecular dynamics simulation based on the modified embedded atom model. Surface melting velocities at different temperatures are calculated as V(T) = -5.082 + 0.00136T and thermodynamic melting point is determined by fitting front advance velocities. Structure changes, thermal expansion coefficient, radial distribution function, static structure factor and average atomic energy for uniform melting processes are studied to simulate plasma thermal shock heating to superheat state of tungsten in fusion reactor. The superheat limit of tungsten crystals can be gotten according to simulation results. The superheat limit for tungsten crystal melting is about 27.2%. Tungsten is the best plasma-facing material because of its highest melt point and highest limiting superheating of all the non-alloyed metals. © 2013 Elsevier Ltd. All rights reserved.


Wang Z.,University of Chinese Academy of Sciences | Zhao K.,Shanghai Institute of Spacecraft Equipment | Chen W.,Shanghai Institute of Spacecraft Equipment | Chen X.,Shanghai Institute of Spacecraft Equipment | Zhang L.,University of Chinese Academy of Sciences
Applied Thermal Engineering | Year: 2014

Tungsten is remarkable for its robustness, especially it has the highest melting point of all the non-alloyed metals. Metallic material tungsten and tungsten alloys have been widely used in aerospace, weapon, nuclear industries and fusion reactor. Tungsten is expected to be the fusion reactor first wall material for this reason. In this paper, self-diffusion coefficients of metallic material tungsten have been investigated via molecular dynamics simulation method using the modified embedded atom potential model. Diffusion activation energy of tungsten can be gotten according to Arrhenius relation between the self-diffusion coefficients simulation results and temperatures. The dipole interaction model is introduced to analyze metallic material tungsten self-diffusion process in a uniform magnetic field. The strong magnetic field increases diffusion activation energy by 34.52% and limits self-diffusion coefficient by 1.15% in 2 T uniform magnetic field. © 2014 Elsevier Ltd. All rights reserved.


Wen X.,Shanghai Institute of Spacecraft Equipment | Wen X.,Zhejiang University | Chen Z.-W.,Zhejiang University | He H.-N.,Zhejiang University
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2013

Clearance in joints of motion is inevitable due to assembly and manufacturing errors and so on. Here, non-linear contact force model related to a clearance joint was established in order to investigate the influence of a revolute joint with clearance on dynamic behavior of a system with this revolute joint, and the friction effect was considered by using Threfall force model based on Coulomb's friction law. Dynamic simulation investigation was performed by embedding a two-axis hydraulic vibration test system having a revolute joint with clearance into ADAMS. The simulation results indicated that there is a large effect of clearance size and excitation frequency on the acceleration response behavior of the hydraulic vibration test system, its peak acceleration response grows with increase in excitation frequency and clearance size; but excitation frequency and clearance size have a slight influence on its displacement response.


Wen X.,Shanghai Institute of Spacecraft Equipment | Wen X.,Zhejiang University | Chen Z.-W.,Zhejiang University | He H.-N.,Zhejiang University
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2014

A continuous contact force model was built in order to investigate joint clearance effects on the dynamics of two-axis hydraulic vibration test system. The test system with clearance joint was imported into the software ADAMS for dynamic simulation, and an experimental set-up was designed and built to achieve some experimental validations under the simple harmonic excitation inputs with different phases. The results indicate that the coupling vibration effect between two exciters leads to the apparent fluctuation of steady response of accelerations in the case of certain clearance size and with excitations out of phase, meanwhile, the rapid increase of peak acceleration happens when the excitation frequency and excitation amplitude increase. Thus, the selection of appropriate clearance size in revolute joint for two-axis hydraulic vibration test system is a crucial step for eliminating the non-linear influence.


Wang D.,Central South University | Wang X.,Central South University | Zhou P.,Central South University | Wu Z.,Central South University | And 2 more authors.
Powder Technology | Year: 2014

In the present work, experimental trials were carried out to investigate the influence of packing density on performance of porous wick for loop heat pipe (LHP). Carbonyl nickel powders with an average size of 1.19μm were used as raw materials. During the filling of powders the graphite mold was put on a mechanical vibrator for different times to get different packing densities. The results show that the porosity, average pore size and permeability decrease with the increasing packing density, respectively. However, the capillary pressure increases with it. And there are no obvious effects on micro-structure and shrinkage ratio. Moreover, the packing density has complex effects on thermal property. After the optimization of parameters, the cylindrical wick with porosity of 59%, average pore size of 1.41μm, permeability of 1.25×10-13m2, capillary pressure of 204kPa and excellent thermal property could be realized. © 2014 Elsevier B.V.


Liu C.-L.,Northwestern Polytechnical University | Zhu H.-R.,Northwestern Polytechnical University | Zhang X.,Shanghai Institute of Spacecraft Equipment | Xu D.-C.,Northwestern Polytechnical University | Zhang Z.-W.,Northwestern Polytechnical University
International Journal of Heat and Mass Transfer | Year: 2014

Film cooling performances of the cylindrical film holes and the laid-back film holes on the turbine blade leading edge model are investigated in this paper. Experimental measurements have been carried out to investigate the influence of the inclined angle in the spanwise direction (i.e. radial angle for a blade in the engine) on the film cooling performances of these two kinds of holes. Three rows of holes are arranged in a semi-cylinder model which is used to model the blade leading edge. Two inclined angles and three blowing ratios are tested. Transient heat transfer measurement technique with double thermochromic liquid crystals is employed in the present experiment. The results show that the trajectory of the film jets in the leading edge region deviates from the mainstream direction to the spanwise direction gradually as the blowing ratio increases. Under large blowing ratio, more area can benefit from the film protection and the film cooling effectiveness distribution is more uniform than those under small blowing ratio, while the heat transfer coefficient is also higher. The basic distribution features of heat transfer coefficient are similar for all the tested models. The heat transfer coefficient in the region where the jet core flows through is relatively lower, while the heat transfer coefficient in the jet edge region is relatively higher. Compared with the cylindrical holes, the jets from the laid-back holes have better film coverage and meanwhile make more area have relatively higher heat transfer coefficient, especially under large blowing ratio. Under the same blowing ratio, the jets from film holes with small radial angle can attach on the wall surface better and give higher film cooling effectiveness in the region close to the hole exit than the film holes with large radial angle, while they also produce relatively higher heat transfer coefficient. © 2013 Elsevier Ltd. All rights reserved.


Zhang Y.,Northeastern University China | Huang H.,Northeastern University China | Huang H.,Chinese Academy of Sciences | Li C.,Shanghai Institute of Spacecraft Equipment
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2014

The pumping speed curves of a variety of rotary vacuum pump, provided by the manufacturers, were empirically fitted with polynomials and digitized for the designer of vacuum system. The program of data-fitting and digitization was written in Visual Basic 6.0. The newly-digitized pumping speed provides a total solution to the common problem that in conventional design of a vacuum system, the pumping-speed range involved is routinely assumed to be a constant in the calculation, which often results in a large error. As an example, the pumping speed curve of 2XZ-8 rotary vane pump was fitted and digitized; and the calculation precision increased by about 22%. In addition, the calculation precision for the pump-down time and average pipeline pressure were also considerably improved.


Hou P.,Shanghai Institute of Spacecraft Equipment | Li Z.,Shanghai Institute of Spacecraft Equipment | Song T.,Shanghai Institute of Spacecraft Equipment | Chen L.,Shanghai Institute of Spacecraft Equipment
Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology | Year: 2016

In order to decrease satellite attitude turnover and guarantee high-accuracy pointing for satellite optical payload, a novel method is designed for horizontal deployment experiment of satellite solar array. A multi-degree-of-freedom balance weight strategy is used to counterbalance the gravity. Firstly, the kinematics model and dynamics model are established. Then, the error analysis is deduced. Finally, the experiment is carried out. The experimental results show that the method can truly simulate the micro-gravity in-orbit environment compared with the previous method. Moreover, it is very strict with mass deviation and centroid deviation of solar array and the system frictions. The results indicate that the model and test methods are correct and meet the test requirements. © 2016, Editorial Board of Journal of Harbin Institute of Technology. All right reserved.

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