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Tong Li,Qingxuan Jia,Gang Chen,Hanxu Sun 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.6
In order to improve the motion reliability of space manipulator during its long time service on-orbit, multiple indexes which can reflect the motion performance and multiple factors (control variables of manipulator) which have influence on motion reliability are involved in establishing an optimization control model. Thus the problem of motion reliability improvement is expressed as an multiple-objective problem (MOP). In order to solve the MOP, dimension reduction strategy is proposed based on covariance matrix of motion reliability indexes. As a result, the MOP is turned into single objective problem. Then control variables are optimized based on null space of space manipulator, and the best weight matrix can be obtained when the objective is minimal. Simulations are carried out to verify the feasibility and effectiveness of the optimization control strategy. By decreasing the error introduction into the control variables, the motion reliability can be effectively improved.
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Preparation of biomass-based yam solar absorber for enhanced solar evaporation application
Ting Li,Juan Jia,Yanqing Wang,Hanxue Sun,Jiyan Li,Zhaoqi Zhu,Weidong Liang 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.11
The solar evaporation system has become a research hotspot in the field of photothermal conversion technology in recent years because of its high photothermal conversion efficiency and practicality of promotion. Biomass solar absorbers have excellent solar absorption properties and high solar-water vapor conversion, but they have the limitations of long feedstock production cycle and high carbonization temperature. As a kind of biomass materials, yam is not only inexpensive, but also has a short production cycle and rich pore structures. Therefore, in this paper, a yam based solar absorber with rich pore structure was prepared, and the photothermal conversion efficiency of the absorber was further investigated. The yam was treated with freeze-dried method and carbonized at different temperatures to obtain yam solar absorbers. Then the thermal stability and porosity of solar absorber was found to gradually rise as the treatment temperature increased. The solar absorption rate of the carbonized yam was close to 90% in the near UV-visible region. Solar-water vapor control experiments with different treatments of the solar absorber of the yam were carried out in simulated solar-driven interface steam generation system (SISGS). An absorber treated at 200 °C in the sun was found to have the best performance with a solar-water vapor conversion of about 90% and a water evaporation rate of 1.3164 kg m−2 h−1.
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