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Optimal aerodynamic design of hypersonic inlets by using streamline-tracing techniques
Xiong, Bing,Ferlauto, Michele,Fan, Xiaoqiang Techno-Press 2020 Advances in aircraft and spacecraft science Vol.7 No.5
Rectangular-to-Ellipse Shape Transition (REST) inlets are a class of inward turning inlets designed for hypersonic flight. The aerodynamic design of REST inlets involves very complex flows and shock-wave patterns. These inlets are used in highly integrated propulsive systems. Often the design of these inlets may require many geometrical constraints at different cross-section. In present work a design approach for hypersonic inward-turning inlets, adapted for REST inlets, is coupled with a multi-objective optimization procedure. The automated procedure iterates on the parametric representation and on the numerical solution of a base flow from which the REST inlet is generated by using streamline tracing and shape transition algorithms. The typical design problem of optimizing the total pressure recovery and mass flow capture of the inlet is solved by the proposed procedure. The accuracy of the optimal solutions found is discussed and the performances of the designed REST inlets are investigated by means of fully 3-D Euler and 3-D RANS analyses.
FORWARD ORDER LAW FOR THE GENERALIZED INVERSES OF MULTIPLE MATRIX PRODUCT
Xiong, Zhipin,Zheng, Bing 한국전산응용수학회 2007 Journal of applied mathematics & informatics Vol.25 No.1
The generalized inverses have many important applications in the aspects of theoretic research and numerical computations and therefore they were studied by many authors. In this paper we get some necessary and sufficient conditions of the forward order law for {1}-inverse of multiple matrices products $A\;=\;A_1A_2{\cdots}A_n$ by using the maximal rank of generalized Schur complement.
Hydrodynamic cavitation and its application in water treatment combined with ozonation: A review
Bing Wang,Yunxian Liu,Huan Zhang,Wen Shi,Mingyang Xiong,Chunyang Gao,Mingcan Cui 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-
Advanced oxidation processes (AOPs) such as cavitation and ozonation have been used as an alternativeand effective option for the treatment of wastewater with difficult to biodegrade compounds. In thisreview, the necessity and advantages of combining hydrodynamic cavitation with ozonation (HC/O3)were initially discussed. The discussion of the mechanism of the HC/O3 process revealed the presenceof both mechanical and chemical effects. Overviews of earlier work with HC/O3 technology were thensummarised to show the positive synergies and the HC devices in different wastewater treatments. Recommendations were given for parameter selection by analysing the impact of important operatingparameters on process performance. Energy efficiency and cost comparisons indicated that the HC/O3process was more cost effective than the individual process. Overall, the HC/O3 process with optimisedconditions is able to increase the degradation rate of refractory pollutants by more than 40% comparedto the HC process alone.
Xiong Wei,Xiaobin Liu,Bing Guo,Shen Yan,Wenli Zhang 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.3
As embedded devices prevail in daily life, high energy consumption caused by embedded software caught academic attentions. Multifarious testing and predicting methods are developed accordingly. This paper proposes a model about energy consumption of embedded device based on analysis of embedded software structure and support vector machine regression. The nonlinear relationship between energy consumption and software structure is revealed. The research finds software structure is determined by features like number of components, complexity of component interface, component coupling, and path length. These features are qualified and modeled by using support vector machine regression and energy consumption is predicted based on this model. The experiments results confirm the proposed model.
Xiong, Pan,Zhang, Xiuyun,Zhang, Fan,Yi, Ding,Zhang, Jinqiang,Sun, Bing,Tian, Huajun,Shanmukaraj, Devaraj,Rojo, Teofilo,Armand, Michel,Ma, Renzhi,Sasaki, Takayoshi,Wang, Guoxiu American Chemical Society 2018 ACS NANO Vol.12 No.12
<P>Cation-deficient two-dimensional (2D) materials, especially atomically thin nanosheets, are highly promising electrode materials for electrochemical energy storage that undergo metal ion insertion reactions, yet they have rarely been achieved thus far. Here, we report a Ti-deficient 2D unilamellar lepidocrocite-type titanium oxide (Ti<SUB>0.87</SUB>O<SUB>2</SUB>) nanosheet superlattice for sodium storage. The superlattice composed of alternately restacked defective Ti<SUB>0.87</SUB>O<SUB>2</SUB> and nitrogen-doped graphene monolayers exhibits an outstanding capacity of ∼490 mA h g<SUP>-1</SUP> at 0.1 A g<SUP>-1</SUP>, an ultralong cycle life of more than 10000 cycles with ∼0.00058% capacity decay per cycle, and especially superior low-temperature performance (100 mA h g<SUP>-1</SUP> at 12.8 A g<SUP>-1</SUP> and −5 °C), presenting the best reported performance to date. A reversible Na<SUP>+</SUP> ion intercalation mechanism without phase and structural change is verified by first-principles calculations and kinetics analysis. These results herald a promising strategy to utilize defective 2D materials for advanced energy storage applications.</P> [FIG OMISSION]</BR>
Finite-time Fault-tolerant Control of Robotic Systems with Uncertain Dynamics
Changgui Xiong,Liang Yang,Bing Zhou,Yong Chen 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.8
Control of nonlinear robotic systems suffering from actuator failure is a significant, yet challenging problem. In this paper, an observer-based fault-tolerant control method is proposed for robotic systems with external disturbances and modeling discrepancy. Technically, based on the state transform, an unknown input observer is designed to estimate the lumped unknown input. With the aid of the proposed observer, the estimate error is ensured to decay to zero within finite time. Subsequently, the estimated unknown input is utilized to compensate the compound unknown input of the faulty system. The analytical results proved that the tracking error of the closedloop system converges to zero in finite-time, even in the presence of actuator faults. Finally, simulation results are provided to demonstrate the effectiveness of the proposed scheme.
THE GAITS AND WALKING CONTROL OF HT-II QUADRUPED WALKING ROBOT
Rong, Hong Bing,Gang, Kong Fan,Biao, Chen Xiong,Yi, Wang Shu 대한전자공학회 1992 HICEC:Harbin International Conference on Electroni Vol.1 No.1
This paper proposes three kinds of gait for HT-II Quadruped Walking Robot. In order that HT-II Quadruped Walking Robot is able to walk stably on ground, a software is developed which consists of three parts; gait-table produce programe ; gait-table check programe and joint drive programe. These three kinds of gait form the basis for further studying of fusing of static and dynamic gaits.