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SPACECRAFT DOCKING SIMULATION USING HARDWARE-IN-THE-LOOP SIMULATOR WITH STEWART PLATFORM 被引量:12
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作者 Huang Qitao Jiang Hongzhou Zhang Shangying Han Junwei 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2005年第3期415-418,共4页
A ground-based hardware-in-the-loop (HIL) simulation system with hydraulically driven Stewart platform for spacecraft docking simulation is presented. The system is used for simulating docking process of the on-orbi... A ground-based hardware-in-the-loop (HIL) simulation system with hydraulically driven Stewart platform for spacecraft docking simulation is presented. The system is used for simulating docking process of the on-orbit spacecraft. Principle and structure of the six-degree-of-freedom simulation system are introduced. The docking process dynamic of the vehicles is modeled. Experiment results and mathematical simulation data are compared to validating the simulation system. The comparisons of the results prove that the simulation system proposed can effectively simulate the on-orbit docking process of the spacecraft. 展开更多
关键词 Spacecraft docking Hardware-in-the-loop simulation Dynamic modeling Stewart platforms
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Theoretical Studies on the Excited-state Properties of Ru(Ⅱ)Polypyridyl Complexes 被引量:1
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作者 张建夫 苗体方 +2 位作者 张智强 李双 罗瑶 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2018年第1期37-43,共7页
Using DFT/TDDFT methods,the excited-state lifetimes of Ru(Ⅱ) polypyridyl complexes were computed accurately and the reason of Ru(Ⅱ) polypyridyl complexes with long excited-state lifetimes was explained by the el... Using DFT/TDDFT methods,the excited-state lifetimes of Ru(Ⅱ) polypyridyl complexes were computed accurately and the reason of Ru(Ⅱ) polypyridyl complexes with long excited-state lifetimes was explained by the electron-transfer distances and HOMO-LUMO gaps.Finally,the photovoltaic conversion efficiencies of complexes were predicted using DFT and docking methods.This work has provided methods of predicting the excited-state lifetimes and photovoltaic conversion efficiencies of Ru(Ⅱ) polypyridyl complexes. 展开更多
关键词 Ru(Ⅱ) complexes excited-state lifetimes DFT docking model
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Molecular level biodegradation of phenol and its derivatives through dmp operon of Pseudomonas putida:A bio-molecular modeling and docking analysis 被引量:1
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作者 Sujay Ray Arundhati Banerjee 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2015年第10期144-151,共8页
Participation of Pseudomonas putida-derived methyl phenol(dmp) operon and Dmp R protein in the biodegradation of phenol or other harmful, organic, toxic pollutants was investigated at a molecular level. Documentatio... Participation of Pseudomonas putida-derived methyl phenol(dmp) operon and Dmp R protein in the biodegradation of phenol or other harmful, organic, toxic pollutants was investigated at a molecular level. Documentation documents that P. putida has Dmp R protein which positively regulates dmp operon in the presence of inducers; like phenols. From the operon,phenol hydroxylase encoded by dmp N gene, participates in degrading phenols after dmp operon is expressed. For the purpose, the 3-D models of the four domains from Dmp R protein and of the DNA sequences from the two Upstream Activation Sequences(UAS)present at the promoter region of the operon were demonstrated using discrete molecular modeling techniques. The best modeled structures satisfying their stereo-chemical properties were selected in each of the cases. To stabilize the individual structures, energy optimization was performed. In the presence of inducers, probable interactions among domains and then the two independent DNA structures with the fourth domain were perused by manifold molecular docking simulations. The complex structures were made to be stable by minimizing their overall energy. Responsible amino acid residues, nucleotide bases and binding patterns for the biodegradation, were examined. In the presence of the inducers, the biodegradation process is initiated by the interaction of phe50 from the first protein domain with the inducers. Only after the interaction of the last domain with the DNA sequences individually, the operon is expressed. This novel residue level study is paramount for initiating transcription in the operon; thereby leading to expression of phenol hydroxylase followed by phenol biodegradation. 展开更多
关键词 Biodegradation dmp operon docking simulations modeling Phenol P.putida
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Investigation into Pilot Handling Qualities in Teleoperation Rendezvous and Docking with Time Delay 被引量:4
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作者 ZHOU Jianyong ZHOU Jianping +1 位作者 JIANG Zicheng LI Haiyang 《Chinese Journal of Aeronautics》 SCIE EI CSCD 2012年第4期622-630,共9页
Teleoperation rendezvous and docking can be used as a backup for autonomous rendezvous and docking(RVD) for an unmanned spacecraft when the autonomous system is failure or for guiding the chaser docking with an unco... Teleoperation rendezvous and docking can be used as a backup for autonomous rendezvous and docking(RVD) for an unmanned spacecraft when the autonomous system is failure or for guiding the chaser docking with an uncooperative target.The theoretical model for analyzing the handling qualities in teleoperation RVD process is established based on the previous studies conducted by National Aeronautics and Space Administration(NASA).The predictive factor is introduced to describe the pilot's predictive ability in the teleoperation tasks with time delay,which interrelates with the skills of a pilot and the predictive assist approach used in the tasks such as the predictive display method.Based on the semi-physical simulation system in our laboratory,900 experiments at two levels of time delay are carried out by 18 volunteers for validating the established model.The experimental results demonstrate the correctness of the theoretical model and indicate that a skilled pilot has a predictive ability of approximately 0.9 in teleoperation RVD tasks.The theoretical analysis shows that the handling qualities are greatly affected by the time delay and the predictive factor,and it is impossible to achieve a teleoperation RVD task for the skilled pilot when the time delay is larger than 9.0 s. 展开更多
关键词 teleoperation rendezvous and docking handling quality theoretical model time delay experimental validation
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