Shanghai Key Laboratory of Spacecraft Mechanisms

Shanghai, China

Shanghai Key Laboratory of Spacecraft Mechanisms

Shanghai, China
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Zhang H.,Shanghai Key Laboratory of Spacecraft Mechanisms | Meng G.,China Aerospace Science and Technology Corporation | Meng G.,Shanghai JiaoTong University | Liu H.,Aerospace System Engineering in Shanghai | Han Z.,Aerospace System Engineering in Shanghai
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2016

Airbag buffering and landing systems are widely used for exploring the planet, possessing the characteristics of lightweight, safety, and the excellent ability for adapting to the environment. A dynamics model was built for an airbag buffering and landing system in this work, and the whole process of charging, landing, contacting, bouncing and re-contacting was demonstrated based on contacting effect and geometric nonlinearity. The rules were obtained from the dynamics simulation on how the airbag initial pressure, initial landing-velocity, and planet ground form affected the acceleration load of important inner positions of the airbag. The characteristics validated the capabilities of the airbag buffering and landing system of self-standing and separating. Research results provide a reference and guidance for the engineering design of the airbag buffering and landing system, which may be applied to deep-space exploration. © 2016, Editorial Office of Journal of Vibration and Shock. All right reserved.


Na S.,Fudan University | Zhu C.-Y.,Fudan University | Peng F.-J.,Shanghai Key Laboratory of Spacecraft Mechanisms | Peng F.-J.,Shanghai Institute of Aerospace System Engineering | And 3 more authors.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2013

The dynamic equation of transverse bending vibration of a solar array during attitude control was built in a non-inertia coordinate system, and the input shaping technique was utilized to process the system input in order to suppress the residual vibration of the solar array. A beam scale model of the solar array driven by a step motor was built, and a fourth-order input shaper was designed according to the dynamic characteristics of the model and was taken as the input signal of the step motor. Attitude control tests under six operating conditions with the shaper were performed. The test results showed that the residual vibration of the solar array is reduced remarkably with a good robustness.


Gao X.-M.,Shanghai Key Laboratory of Spacecraft Mechanisms | Gao X.-M.,CAS Lanzhou Institute of Chemical Physics | Sun J.-Y.,Shanghai Key Laboratory of Spacecraft Mechanisms | Sun J.-Y.,CAS Lanzhou Institute of Chemical Physics | And 6 more authors.
Mocaxue Xuebao/Tribology | Year: 2013

Ag-Cu films were deposited at a low temperature (173 K, LT-Ag-Cu films) by arc ion plating. Atomic oxygen (AO) irradiation experiments were conducted using a ground AO simulation facility. The AO resistant and wear behavior of the LT-Ag-Cu films were investigated by X-ray diffraction, atomic force microscope and a ball-on-disk tribometer using Ag film deposited at room temperature (300 K, RT-Ag film) as a reference. The results show that the LT-Ag-Cu films were composed of AgCu alloy and small amount of Ag or Cu. Because of densified microstructure, lower crystallite size and alloying with Cu, the LT-Ag-Cu film represented much better anti-oxidation capability under the AO irradiation condition than that of the RT- and LT-Ag films. Wear results show that as compared with the RT-Ag film, the LT-Ag-Cu films exhibited much better wear resistance due to the better film-substrate adhesion as well as the fine/dense structure, and the wear increase resulted from the AO irradiation was much lower for the LT-Ag-Cu films than the RT- and LT-Ag film due to the improvement in the AO resistant behavior.


Xu S.-S.,CAS Lanzhou Institute of Chemical Physics | Xu S.-S.,University of Chinese Academy of Sciences | Gao X.-M.,CAS Lanzhou Institute of Chemical Physics | Gao X.-M.,Shanghai Key Laboratory of Spacecraft Mechanisms | And 4 more authors.
Mocaxue Xuebao/Tribology | Year: 2013

WSx films on Si(100) wafer and 9Cr18 steel substrates were deposited by medium frequency magnetron sputtering. The structure of the films was characterized by X-ray diffraction, field emission scanning electron microscope, atomic force microscope and X-ray photoelectron spectroscope. The mechanical and tribological properties were investigated using triboindenter and vacuum ball-on-disk tribometer, respectively. The results show that the S/W ratio raised with increasing working pressure, and increased firstly and then decreased with increase in sputtering power density, that was ascribed to the different oxidation degree of the deposited films and the selective sputtering. When the S/W ratio was low, the films were compact and hard, but exhibited high friction and wear due to the high content of W. As the S/W ratio was raised, the films showed an increase in WS2 content, along with a lower and more stable friction and better wear resistance.


Wang H.,Shanghai Key Laboratory of Spacecraft Mechanisms | Li R.,Shanghai Key Laboratory of Spacecraft Mechanisms | Miao J.,Shanghai Key Laboratory of Spacecraft Mechanisms | Zhang X.,University of Electronic Science and Technology of China | Wang Z.,University of Electronic Science and Technology of China
Proceedings of 2012 International Conference on Quality, Reliability, Risk, Maintenance, and Safety Engineering, ICQR2MSE 2012 | Year: 2012

System reliability-based design is attracting more and more attention as an important tool to decrease the probability of failure. So far, reliability-based methods are studied separately from two aspects: system topology design and structural components design. Actually, system topology and structural components should be designed at the same time when facing a system design problem. In this paper, in order to reflect the dynamic interaction between system topology and structural components, a reliability-based design framework integrating system topology and structural components is proposed. The proposed framework would be widely applicable for more and more complicated systems with higher reliability requirements. An illustrated example is provided to demonstrate the proposed framework. © 2012 IEEE.


Li B.,Shanghai Key Laboratory of Spacecraft Mechanisms
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | Year: 2012

In view of the multiple factors and their interactive influences affecting the transmission performance of harmonic drives used in spacecraft, thermal-vacuum tests are performed using harmonic drive of type XB1-60-150. Based on the interactive orthogonal design method, the effects of rotational speed, surrounding temperature, output load torque, and lubrication type on the transmission efficiency of the harmonic drive are investigated. Range analysis and variance analysis are applied to analyze the sensitivity of these factors and their coupling influences. The results achieved by both range analysis and variance analysis are close. When confidence p=99%, the study indicaties that rotational speed and surrounding temperature have notable effect on the transmission performance of harmonic drive, and so do the interactive influences of output load torque and lubrication type. The best application conditions are obtained by interactive analysis under which the transmission performance of harmonic drive can achieve the most satisfactory effect.

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