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Generalized Lanchester warfare model characterized by information asymmetry effect

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Journal of Systems Engineering and Electronics 2017年第2期28卷 315-321页

作者： Weiwen Hu Dan Mei yongkai liu College of Science Naval University of Engineering Wuhan 430033 China

Combined with the fact that information asymmetry between two belligerent parties is very common in information-based warfare, the bidirectional influence of asymmetric information on both sides is analyzed. A new damage coefficient is formed based on the analysis, and a generalized Lanchester warfare model characterized by information asymmetry effect is built. According to the staggered transformation of information asymmetric degree resulting from the changing tactic of both sides by turns, a method for approximate solution of the model is presented by translating the information asymmetric degree as a ladder function, and both examples of the solving model and further discussion about the solution are given. The results indicate that the model can serve as a reference to analyze and forecast the course of war quantitatively. ? 2017 Beijing Institute of Aerospace Information.

关键词： Electronics industry Engineering Industrial engineering

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基于项目式教学法的数学软件课程教学改革

科教导刊 2024年第13期 119-121页

作者：冯杭杨狄刘永凯海军工程大学基础部湖北武汉430033 海军工程大学电子工程学院湖北武汉430033

传统的数学软件课程教学模式主要集中于知识的传递和掌握,相对忽视了学生在实际应用和创新能力培养方面的需求。项目式教学法作为一种促进学生实际应用和创新能力发展的教学策略,为数学教育提供了一种新的视角和转型途径。文章探讨了项... 详细信息

传统的数学软件课程教学模式主要集中于知识的传递和掌握,相对忽视了学生在实际应用和创新能力培养方面的需求。项目式教学法作为一种促进学生实际应用和创新能力发展的教学策略,为数学教育提供了一种新的视角和转型途径。文章探讨了项目式教学法在数学软件课程教学中的应用,强调在真实情境中培养学生的实际应用能力和创新思维,在课程中加入数学建模竞赛赛题作为实训项目、编写MATLAB实时脚本作为课程配套练习题,并引入翻转课堂的教学模式,帮助学生更深入地理解理论知识并掌握必要的应用技能。

关键词：项目式教学法实时脚本翻转课堂

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Timetabling optimization of classrooms and self-study rooms in university teaching buildings based on the building controls virtual test bed platform considering energy efficiency

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Building Simulation 2023年第2期16卷 263-277页

作者： Yanfeng liu Hui Ming Xi Luo Liang Hu yongkai Sun State Key Laboratory of Green Building in Western China Xi’an University of Architecture and TechnologyXi’an 710055China School of Building Services Science and Engineering Xi’an University of Architecture and TechnologyXi’an 710055China School of Management Xi’an University of Architecture and TechnologyXi’an 710055China

The energy consumption of a teaching building can be effectively reduced by timetable optimization.However,in most studies that explore methods to reduce building energy consumption by course timetable optimization,self-study activities are not considered.In this study,an MATLAB-EnergyPlus joint simulation model was constructed based on the Building Controls Virtual Test Bed platform to reduce building energy consumption by optimizing the course schedule and opening strategy of self-study rooms in a holistic way.The following results were obtained by taking a university in Xi’an as an example:(1)The energy saving percentages obtained by timetabling optimization during the heating season examination week,heating season non-examination week,cooling season examination week,and cooling season non-examination week are 35%,29.4%,13.4%,and 13.4%,respectively.(2)Regarding the temporal arrangement,most courses are scheduled in the morning during the cooling season and afternoon during the heating season.Regarding the spatial arrangement,most courses are arranged in the central section of the middle floors of the building.(3)During the heating season,the additional building energy consumption incurred by the opening of self-study rooms decreases when duty heating temperature increases.

关键词： timetabling optimization university teaching buildings energy efficiency Building Controls Virtual Test Bed platform genetic algorithm

Probing the orbital angular momentum of intense vortex pulses with strong-field ionization

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Light(Science & Applications) 2022年第2期11卷 276-286页

作者： Yiqi Fang Zhenning Guo Peipei Ge Yankun Dou yongkai Deng Qihuang Gong Yunquan liu State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuanShanxi 030006China Center for Applied Physics and Technology HEDPSPeking UniversityBeijing 100871China Beijing Academy of Quantum Information Sciences Beijing 100193China

With the rapid development of femtosecond lasers,the generation and application of optical vortices have been extended to the regime of intense-light-matter interaction.The characterization of the orbital angular momentum(OAM)of intense vortex pulses is very critical.Here,we propose and demonstrate a novel photoelectron-based scheme that can in situ distinguish the OAM of the focused intense femtosecond optical vortices without the modification of light helical phase.We employ two-color co-rotating intense circular fields in the strong-field photoionization experiment,in which one color light field is a plane wave serving as the probing pulses and the other one is the vortex pulses whose OAM needs to be characterized.We show that by controlling the spatial profile of the probing pulses,the OAM of the vortex pulses can be clearly identified by measuring the corresponding photoelectron momentum distributions or angle-resolved yields.This work provides a novel in situ detection scenario for the light pulse vorticity and has implications for the studies of ultrafast and intense complex light fields with optical OAM.

关键词： intense momentum field

Toward practical gas sensing with rapid recovery semiconducting carbon nanotube film sensors

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Science China(Information Sciences) 2022年第6期65卷 226-233页

作者： Fangfang liu Mengmeng XIAO yongkai NING Shaoyuan ZHOU Jianping HE Yanxia LIN Zhiyong ZHANG Hunan Institute of Advanced Sensing and Information Technology Xiangtan University Institute of Microelectronics of Chinese Academy of Sciences and University of Chinese Academy of Sciences Key Laboratory for the Physics and Chemistry of Nanodevices and Center for Carbon-based Electronics Department of Electronics Peking University

Nanomaterials have been considered as promising materials to construct highly sensitive and miniaturized gas sensors due to their high ratio of surface to volume, but almost all of the reported nanomaterials based resistive gas sensors are difficult to use in the practical system mainly owing to the long recovery time and non-equilibrium state at room temperature. Here, we demonstrate a gate assistant technology to realize the rapid recovery to an equilibrium state in semiconducting carbon nanotube(CNT) thin-film gas sensors and promote the CNT-based gas sensors to reach the practical application level. Specifically, we construct highly uniform gas sensors based on semiconducting solution-derived CNT film and accelerate the gas molecules desorption by applying a voltage on the back gate(substrate), which is named gate-assistant recovery technology. By combining the gate-assistant recovery technology and a modified concentration calculation method, highly reproducible detection systems have been realized by using a custom-built printed circuit board(PCB) based data acquisition circuits to execute a real-time rapid detection of H2 in the air at room temperature, and especially exhibits a record response time of 9 s and recovery time of 50 s under a resolution of 10 ppm, which outperformed previous low dimensional nanomaterials based portable H2 detection systems. The gate-assistant rapid recovery and related concentration calculation technologies are helpful to promote the nanomaterials-based gas sensors to practical application for highly sensitive online gas detection.

关键词： carbon nanotube gas sensor thin-film transistors rapid recovery

Effect of windage heating on a micro high-speed rotor-stator cavity

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Propulsion and Power Research 2022年第4期11卷 496-510页

作者： Jianyu liu Guoqiang Xu Xi Zhao Bensi Dong yongkai Quan National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics Research Institute of Aero-EngineBeihang UniversityBeijing100191China Beihang Hangzhou Innovation Institute Yuhang Xixi Octagon CityYuhang DistrictHangzhou310023China AECC Guiyang Engine Design Research Institute Guiyang550081China

The main objective of this work is to investigate the effect of windage heating on the micro high-speed rotor-stator cavity.The influences of centrifugal force and spacing on the windage heating are analyzed with and without the change of gap ratio respectively.The results demonstrate that there is no difference in the flow structure between micro and large-scale rotorstator cavities at the same rotational Reynolds number and gap ratio.However,the windage heating induced by the larger centrifugal force and smaller spacing brings the different heat transfer laws for the micro rotor-stator cavity.The larger centrifugal force weakens the local heat transfer near the rotor periphery.Such influence can be strengthened at higher rotational Reynolds numbers and lower rotor excess temperatures.Besides,the smaller spacing further enhances the windage heating and reduces the average heat transfer especially under the condition of lower gap ratio.The findings of this work contribute to the design of rotor-stator cavity utilized in the micro rotating machinery.

关键词： Micro rotor-stator cavity Flow Heat transfer Windage heating Centrifugal force Spacing

分布式电动车转向横向稳定性力矩适应性分配策略

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重庆理工大学学报（自然科学） 2024年第3期38卷 46-54页

作者：王艳华孟永凯邓吉琛王耀勋管权才刘雨涛中北大学能源与动力工程学院太原030051

为了提高分布式驱动电动汽车转向行驶的横向稳定性,基于Matlab/Simulink和CarSim建立了分布式驱动电动汽车二自由度动力模型,并设计了车辆的横向稳定性控制策略。控制系统由上下两部分组成:上层力矩计算控制器,主要基于PID控制策略计算... 详细信息

为了提高分布式驱动电动汽车转向行驶的横向稳定性,基于Matlab/Simulink和CarSim建立了分布式驱动电动汽车二自由度动力模型,并设计了车辆的横向稳定性控制策略。控制系统由上下两部分组成:上层力矩计算控制器,主要基于PID控制策略计算车辆所需的附加横摆力矩;下层力矩分配控制器,根据车辆转向行驶时所需附加横摆力矩的大小,在差动驱动、差动制动、摩擦制动3种力矩分配方式中选取相适应的分配方式将力矩合理分配到各个轮毂电机上。研究结果表明:所设计的横向稳定性控制系统最大能够使车辆横摆角速度减小58%,并且可以良好地追踪理想质心侧偏角,且波动减少,有效提高了车辆转向行驶时的横向稳定性。在差动驱动分配方式控制下车辆对追踪期望速度具有良好的效果;车辆所需附加横摆力矩较大时,下层力矩分配控制器采用差动制动、摩擦制动分配方式将牺牲对期望速度的追踪。

关键词：分布式驱动电动汽车横向稳定性 PID控制力矩适应性分配

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P-wave and S-wave response of coal rock containing gas-water with different saturation: an experimental perspective

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Frontiers of Earth Science 2023年第1期17卷 100-108页

作者： Dameng liu Lijing LI Zheng ZHAO Wei CHEN Yidong CAI yongkai QIU Yingfang ZHOU School of Energy Resources China University of GeosciencesBeijing 100083China Coal Reservoir Laboratory of Natural Engineering Research Center of CBM Development&Utilization China University of GeosciencesBeijing 100083China Beijing Furuibao Energy Technology Company Beijing 100176China School of Engineering King’s CollegeUniversity of AberdeenAB243UE AberdeenUK

The acoustic response of gas and/or water saturated coal rock is fundamental for establishing the correspondence between the physical properties of the coal reservoir and the characteristics of the well-logging response,which is the technology essential for the geophysical exploration of coalbed methane(CBM).This acoustic response depends on water(Sw)and gas(Sg)saturation among other factors.In this study,we performed acoustic tests on dry and different gas-water saturated coal samples with different degrees of metamorphism and deformation,collected from several coal mining areas in China.These tests enabled us to analyze the influence of coal type and gas-water saturation on the acoustic response of CBM formations.Our results show that the acoustic velocity of P-wave and S-wave(Vp and Vs,respectively),and the relative anisotropy of and Vs,increased with increasing vitrinite reflectance,density,Vp and Sw.WithSw increasing from 0 to 100%,the growth rate of the acoustic velocity decreased with increasing vitrinite reflectance.The Vp/Vs ratio of tectonic coal was generally higher than that of primary coal.The growth rate of the relative anisotropy in tectonic coal was markedly higher than that in primary coal.

关键词： coal rock gas-water water saturation acoustic velocity relative anisotropy

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一种船用吸附式系泊装置的液压位移补偿系统

海洋工程装备与技术 2024年第2期11卷 59-62页

作者：刘玉亮朱迪朱永凯欧阳丽虎中海油能源发展股份有限公司采油服务分公司天津300452

船舶系码头或船舶间转接装卸货时,船舶与码头或船舶之间会出现纵向位移变化,传统方式通过调节缆绳完成补偿。本文将船舶与码头间相对位移量输入PLC控制系统,将计算结果输入液压系统,通过液压臂的行程油缸伸缩的方式,补偿船舶纵向位移的... 详细信息

船舶系码头或船舶间转接装卸货时,船舶与码头或船舶之间会出现纵向位移变化,传统方式通过调节缆绳完成补偿。本文将船舶与码头间相对位移量输入PLC控制系统,将计算结果输入液压系统,通过液压臂的行程油缸伸缩的方式,补偿船舶纵向位移的改变。

关键词：液压位移补偿 PLC控制距离传感器