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Turbulent drag reduction by sector-shaped counter-flow dielectric barrier discharge plasma actuator

Chinese Physics B 2025年第2期34卷 362-370页

作者： Borui Zheng Shaojie Qi Minghao Yu Jianbo Zhang Linwu Wang Dongliang Bian School of Automation and Information Engineering Xi’an University of TechnologyXi’an 710048China School of Mechanical and Precision Instrument Engineering Xi’an University of TechnologyXi’an 710048China Science and Technology on Plasma Dynamics Laboratory Air Force Engineering UniversityXi’an 710038China Shaanxi Key Laboratory of Complex System Control and Intelligent Information Processing Xi’an 710048China Shaanxi University Key Laboratory of Photonic Power Devices and Discharge Regulation Xi’an 710048China

The primary objective in aircraft transportation is to minimize turbulent drag, thereby conserving energy and reducing emissions. We propose a sector-shaped counter-flow dielectric barrier discharge plasma actuator, which leverages jet synthesis for drag reduction. A drag control experiment was conducted in a low-speed wind tunnel with a controlled flow velocity of 9.6 m/s(Re = 1.445 × 10^(4)). This study investigated the effects of varying pulse frequencies and actuation voltages on the turbulent boundary layer. Using a hot-wire measurement system, we analyzed the pulsating and time-averaged velocity distributions within the boundary layer to evaluate the streamwise turbulent drag reduction. The results show that the local TDR decreases as the pulse frequency increases, reaching a maximum reduction of approximately 20.97% at a pulse frequency of 50 Hz. In addition, as the actuation voltage increases, the friction coefficient decreases, increasing the drag reduction rate. The maximum drag reduction of approximately 33.34% is achieved at an actuation voltage of 10 kV.

关键词： plasma flow control turbulent boundary layer turbulent drag reduction

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Adsorption of typical gasoline vapor emitted from service stations by commercial activated carbon:static/dynamic adsorption and kinetics simulation

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Frontiers of Environmental Science & engineering 2025年第3期19卷 87-98页

作者： Wei Hu Quanming Liang Dan Lu Beibei Li Biqi Ren Qingye Luan Jia Liu Wenjun Liang Yuhu Huang National Engineering Research Center of Urban Environmental Pollution Control Beijing Key Laboratory of Urban Atmospheric Volatile Organic Compounds Control Technology and ApplicationsBeijing Municipal Research Institute of Eco-Environmental ProtectionBeijing 100037China Key Laboratory of Beijing on Regional Air Pollution Control Faculty of Environment and LifeBeijing University of TechnologyBeijing 100124China Institute of Urban Safety and Environmental Science Beijing Academy of Science and TechnologyBeijing 100054China

Gasoline vapor emissions from service stations significantly affect urban *** the research on the mechanisms and effectiveness of gasoline vapor removal is limited,this study innovatively investigates the static and dynamic adsorption of xylene—a typical gasoline vapor and one of the most active secondary organic aerosol(SOA)species—by commercial activated carbon(AC).The results showed that the saturation static adsorption capacity(Q_(e))of 12 ACs varied from 0.9 to 870.7 mg/g,which correlated with the specific surface area(SSA)and pore *** them,11#and 12#ACs were identified as the most effective adsorbents for typical gasoline vapor *** maximum dynamic Q_(e) increased from 301.5 to 414.3 mg/g when the initial xylene concentration rose from 918 to 2008 mg/m^(3) for 11#AC,and from 201.4 to 406.2 mg/g when the initial xylene concentration increased from 589 to 2120 mg/m^(3) for 12#*** findings implied a direct correlation between higher initial xylene concentrations and greater dynamic Q_(e) values,with static Q_(e) values surpassing dynamic *** adsorption kinetics simulation were analyzed by the pseudo-first-order(PFO)and pseudo-second-order(PSO)*** kinetics results demonstrated that the PFO was more effective in characterizing the adsorption of xylene onto ACs(R2>0.989),indicating that the adsorption of typical gasoline vapor by ACs primarily involves physical *** findings of static/dynamic adsorption and kinetics provide valuable guidance for practical applications of gasoline vapor removal in service stations.

关键词： Activated carbon Gasoline vapor Xylene Dynamic adsorption Breakthrough curve

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Ride-hailing origin-destination demand prediction with spatiotemporal information fusion

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transportation Safety and Environment 2024年第2期6卷 63-74页

作者： Ning Wang Liang Zheng Huitao Shen Shukai Li School of Traffic and Transportation Engineering Central South UniversityChangsha 410075China State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong UniversityBeijing 100044China

Accurate demand forecasting for online ride-hailing contributes to balancing traffic supply and demand,and improving the service level of ride-hailing *** contrast to previous studies,which have primarily focused on the inflow or outflow demands of each zone,this study proposes a conditional generative adversarial network with a Wasserstein divergence objective(CWGAN-div)to predict ride-hailing origin-destination(OD)demand *** blocks and refined loss functions help to enhance the stability of model *** conditional information is employed to capture external spatiotemporal dependencies and guide the model towards generating more precise *** analysis using ride-hailing data from Manhattan,New York City,demon-strates that our proposed CWGAN-div model can effectively predict the network-wide OD matrix and exhibits strong convergence *** experiments also show that the CWGAN-div outperforms other benchmarking ***,the proposed model displays potential for network-wide ride-hailing OD demand prediction.

关键词： intelligent transport system ride-hailing generative adversarial networks spatiotemporal dependencies origin-destination(OD)demand prediction

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Image Super-Resolution Reconstruction Based on the DSSTU-Net Model

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Computers, Materials & Continua 2025年第4期83卷 1057-1078页

作者： Bonan Yu Taiping Mo Qi Ma Qiumei Li Peng Sun School of Electronic Engineering and Automation Guilin University of Electronic TechnologyGuilin541004China School of Architecture and Transportation Engineering Guilin University of Electronic TechnologyGuilin541004China Key Laboratory of Intelligence Integrated Automation in Guangxi Universities Guilin541004China

Super-resolution(SR)reconstruction addresses the challenge of enhancing image resolution,which is critical in domains such as medical imaging,remote sensing,and computational ***-quality image reconstruction is essential for enhancing visual details and improving the accuracy of subsequent *** methods,including interpolation techniques and basic CNNs,often fail to recover fine textures and detailed structures,particularly in complex or high-frequency *** this paper,we present Deep Supervised Swin Transformer U-Net(DSSTU-Net),a novel architecture designed to improve image SR by integrating Residual Swin Transformer Blocks(RSTB)and Deep Supervision(DS)mechanisms into the U-Net ***-Net leverages the Swin Transformer’s multi-scale attention capabilities for robust feature extraction,while DS at various stages of the network ensures better gradient propagation and refined feature *** ST block introduces a hierarchical self-attention mechanism,allowing the model to capture both local and global context,which is crucial for high-quality SR ***,DS applied at multiple layers in the decoder enables direct supervision on intermediate feature maps,accelerating convergence and improving *** DSSTU-Net architecture was rigorously evaluated on the DIV2K,LSDIR,SET5,and SET14 datasets,demonstrating its superior ability to generate high-quality ***,the potential applications of this model extend beyond image enhancement,with promising use cases in medical imaging,satellite imagery,and industrial inspection,where high-quality image reconstruction plays a crucial role in accurate diagnostics and operational *** work provides a reference method for future research on advanced image restoration techniques.

关键词： SR DSSTU-Net RSTB DS

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Generalized response displacement methods for seismic analysis of underground structures with complex cross section

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Earthquake engineering and engineering Vibration 2023年第4期22卷 979-993页

作者： Xu Zigang Ding Linling Du Xiuli Xu Chengshun Zhuang Haiyang Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering East China Jiaotong UniversityNanchang 330013China Key Laboratory of Urban Security and Disaster Engineering of the Ministry of Education Beijing University of TechnologyBeijing 100124China

The response displacement method(RDM)is recommended for the seismic analysis of underground structures in the transverse direction for many codes,including bases for design of structures-seismic actions for designing geotechnical works(ISO 23469)and code for seismic design of urban rail transit structures(GB 50909-2014).However,there are some obvious limitations in the application of *** and the shear stress of the soil could be approximately evaluated for the structures having a simple cross section,such as rectangular and circular *** is necessary to propose simplified seismic analysis methods for structures with complex cross *** paper refers to the idea of RDM and proposes three generalized response displacement methods(GRDM).In GRDM1,a part of the soil surrounding a structure is selected to generate a generalized underground structure with a rectangular cross section,and the same analysis model as RDM is applied to analyze the responses of the *** GRDM2,a hollow soil model without a generalized structure is used to compute the equivalent load caused by the relative displacement of the soil,and the soil-structure interaction model is applied to calculate the responses of the *** GRDM3,a continuous soil model is applied to compute the equivalent load caused by the relative displacement and shear stress of the soil,and the soil-structure interaction model is applied to analyze the responses of the structure,which is the same as the model used in *** time-history analysis method(THAM)is used to evaluate the accuracy of the proposed simplified *** show that the error of GRDM1 is about 20%,while the error is only 5%for GRDM2 and *** the three proposed methods,GRDM3 has obvious advantages regarding calculation efficiency and ***,it is recommended to use GRDM3 for the seismic response analysis of underground structures that have conventional simple or complex cross sections.

关键词： underground structures seismic analysis response displacement method equivalent seismic load complex cross section

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Interval analysis for neural networks with application to fault detection

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Science China(Information Sciences) 2024年第11期67卷 222-237页

作者： Zhenhua WANG Youdao MA Song ZHU Thach Ngoc DINH Yi SHEN Department of Control Science and Engineering Harbin Institute of Technology National Key Laboratory of Complex System Control and Intelligent Agent Cooperation School of Mathematics China University of Mining and Technology The CEDRIC-Lab Conservatoire National des Arts et Métiers (CNAM)

This paper investigates an interval analysis method for neural networks and applies it to fault detection for systems with unknown but bounded measurement noise. First, a novel interval analysis method is presented, which can compute the bounds of the output of a feedforward neural network subject to a bounded input. By applying the proposed interval analysis method to a network trained with fault-free system data, adaptive thresholds for fault detection are computed. Finally, one can acquire fault detection results via a fault detection strategy. The proposed method can achieve tight bounds of the network output and employ simple operations, which leads to accurate fault detection results and a low computational burden.A numerical simulation and an experiment on an AC servo motor are given to illustrate the effectiveness and superiority of the proposed method.

关键词： interval analysis feedforward neural network fault detection adaptive thresholds

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Interbasin groundwater flows in the Yarlung Zangbo River Basin and its surrounding areas:A perspective

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Science China(Technological Sciences) 2025年第4期68卷 299-301页

作者： Jianxin CHEN Xingxing KUANG Linfeng FAN Chunmiao ZHENG Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen518000China State Key Laboratory of Mountain Hazards and Engineering Resilience Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu610000China

Interbasin groundwater flows(IGFs)are movements of groundwater across topographic basin boundaries,which can either contribute to or deplete the water resources of a basin[1].Basins that net-export groundwater beyond their topographic boundaries are termed groundwater exporters,whereas those that receive groundwater from beyond their topographic confines are known as groundwater *** studies have highlighted that the Yarlung Zangbo River Basin(YZRB)is under the impact of IGFs[2,3].

关键词： interbasin groundwater flows interbasin groundwater flows igfs groundwater importers water resources movements groundwater groundwater exporters Yarlung Zangbo River Basin

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Reynolds number dependence of particle transport in a 90°bend with electrostatic effects

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Particuology 2023年第6期77卷 91-104页

作者： Yudong Yan Yanlin Zhao Min Liu Jun Yao International Joint Laboratory on Clean Energy Science and Technology Beijing Key Laboratory of Process Fluid Filtration and SeparationCollege of Mechanical and Transportation EngineeringChina University of Petroleum-BeijingBeijing102249China

In this work,particle transport in a fully developed turbulent 90°bend flow at the"electrostatic equi-librium"state is simulated using large eddy simulation coupled with Lagrangian particle tracking *** flow Reynolds numbers(based on bulk velocity)considered is from 34000 to *** particle size 5,10 and 50μm are considered and their corresponding St number are from 2.2 to *** results of the bend flow agree well with experimental *** electrostatic field formed in the bend is symmetric in the spanwise direction but asymmetric in the vertical direction and radial direction,which is independent of Reynolds *** minimum electrostatic field strength occurs at r/ra=0.25 near the inner wall of the *** transported in a bend gradually accumulate near the wall due to turbophoresis,such trend is improved by *** addition,under the effect of electrostatics,the plume pattern of particle distribution *** concentration at the inner wall of the bend is higher than that at the outer wall,which depends on the combined effect of elec-trostatics and Dean vortices in the bend.

关键词： Electrostatics Bend Turbulent flow Particle transport Largeeddy simulation

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Construction of target detection teaching platform based on improved YOLOv5s algorithm

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International Journal of Wireless and Mobile Computing 2025年第2期28卷 216-222页

作者： Li, Gongfa Zhu, Housheng Tang, Xinjie Jiang, Du Zou, Chunlong Key Laboratory of Metallurgical Equipment and Control Technology of Ministry of Education Wuhan University of Science and Technology Hubei Wuhan China Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science and Technology Hubei Wuhan China Hubei University of Automotive Technology College of Mechanical Engineering Shiyan442002 China

Measurement and control technology and instrumentation, as a high-tech intensive specialty integrating disciplines such as electrical engineering, optics, control theory, computer science and instrumentation science, has a strong interdisciplinary nature. This presents challenges to traditional teaching methods which often fail to fully cultivate students' practical and innovative abilities. To address this, a multi-level teaching model focused on the cultivation of practical and innovative skills has been developed, reforming the original experimental teaching mode and integrating the establishment of experimental teaching platforms. The proposed teaching model integrates theoretical knowledge with practical application, utilising improved experimental platforms such as YOLOv5s for hands-on teaching. The reformed teaching model has enhanced students' comprehensive abilities and achieved noticeable success in teaching practice. Copyright © 2025 Inderscience Enterprises Ltd.

关键词： Students

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Energy dissipation mechanism and ballistic characteristic optimization in foam sandwich panels against spherical projectile impact

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Defence technology（防务技术） 2024年第5期35卷 108-122页

作者： Jianqiang Deng Tao Liu Liming Chen Xin Pan Jingzhe Wang Shaowei Zhu Weiguo Li College of Aerospace Engineering Chongqing UniversityChongqing 400030China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400030China Chongqing Key Laboratory of Heterogeneous Material Mechanics Chongqing UniversityChongqing 400030China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China

This study systematically examines the energy dissipation mechanisms and ballistic characteristics of foam sandwich panels(FSP)under high-velocity impact using the explicit non-linear finite element *** on the geometric topology of the FSP system,three FSP configurations with the same areal density are derived,namely multi-layer,gradient core and asymmetric face sheet,and three key structural parameters are identified:core thickness(t_(c)),face sheet thickness(t_(f))and overlap face/core number(n_(o)).The ballistic performance of the FSP system is comprehensively evaluated in terms of the ballistic limit velocity(BLV),deformation modes,energy dissipation mechanism,and specific penetration energy(SPE).The results show that the FSP system exhibits a significant configuration dependence,whose ballistic performance ranking is:asymmetric face sheet>gradient core>*** mass distribution of the top and bottom face sheets plays a critical role in the ballistic resistance of the FSP *** BLV and SPE increase with tf,while the raising tcor noleads to an increase in BLV but a decrease in ***,a face-core synchronous enhancement mechanism is discovered by the energy dissipation analysis,based on which the ballistic optimization procedure is also conducted and a design chart is *** study shed light on the anti-penetration mechanism of the FSP system and might provide a theoretical basis for its engineering application.

关键词： Sandwich panel Numerical simulation Ballistic resistance Specific penetration energy Energy analysis

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