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北京理工大学学报：英文版

北京理工大学学报：英文版

本学报是以基础理论、应用科学和工程技术为主的综合性学术刊物，主要反映我校重要科研成果，促进学术交流，发展科学技术，推动教学和科研工作的开展。
  • 发文量：2346
  • 被引量：1626
  • H指数：12
  • 开始收录时间：-
  • CNKI综合因子：-
  • 维普期刊影响因子： 0.08
  • 万方期刊影响因子：-
  • 创刊时间：-
  • 国内刊号/CN：11-2916/T
    国际刊号/ISSN：1004-0579
  • 发行周期：季刊
    邮发代号：80-246
  • 主管单位：Ministry of Industry and Information Technology of the People’s Republic of China
    主办单位：北京理工大学
北京理工大学学报：英文版-联系信息
  • 主编：Yongtian Wang
  • 电话：010-68914374 68914627
  • 邮箱：blgywb@bit.edu.cn
  • 地址：北京海淀区中关村南大街5号
  • 邮编：100081
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北京理工大学学报：英文版 >2023年第5期

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  • 摘要：The results of measurements conducted to determine the number and mass concentration of particles emitted from the liquefied natural gas (LNG) fueled spark ignition engines are presented. Particle size distributions were measured at different speeds,different loads and ESC cycles. The nanoparticles with diametersmaller than 39 nm,measured by the electrical low-pressure impactor (ELPI),are dominant in number concentration that is nearly 92.7% of the total number of the emitted particles at the peak point. As for the mass of emission particle,it is shown that the mass of the particles greater than 1.2 μm is more than 65% that of the emitted particles.
  • 摘要：A general theory of optical parametric generation that accounts for pump depletion, loss, phase mismatch, group-velocity mismatch among the pump, signal and idler pulses, and intrapulse group- velocity dispersion is proposed for coherent ultrashort pulses with arbitrary shapes and carrier chirps. The coupled differential equations are numerically solved using a symmetric split-step beam-propagation method. The general solutions of these equations are obtained and the optical parametric generation process is theoretically investigated. Results show that the major factors, which remarkably affect the optical parametric conversion efficiency and durations of the pulses in phase-matched structure, are the group velocity mismatch and the intrapulse group velocity dispersion.
  • 摘要：The radar cross section (RCS) of dispenser and its components is computed by graphical electromagnetic computing (GRECO) method, which bases on physical optics (PO) method. A satisfied agreement is gotten between computed and measured results outdoor. The results show that the main scattering source of the dispenser is the mirror reflecting of the body; in the most crucial nose-on region, the nose mirror reflecting plays important role; the corner reflecting is important to the fins’ RCS. The corresponding measures to reduce dispenser’s RCS are proposed. It is indicated that to reduce RCS, shaping should be adopts first, while aerodynamic characteristics and stealth characteristics should be considered synthetically during the design of dispenser.
  • 摘要：In the large-scale distributed hardware-in-the-loop radar simulation system based on HLA, a new solution ofprocessing after acquisition is proposed, which separates the software subsystem from the hardware jammer subsystem bya response database, so as to settle the problem,that the software subsystem can not meet the real-time need of thehardware,with very little increment of code. And the data completeness and feasibility of this solution are discussed.
  • 摘要：Based on Matlab/Simulink and Fuzzy Logic toolboxes,the altitude control system is designed and simulated.The validity of conventional PID control method and adaptive fuzzy PID control method is compared.It can be drawn out that the adaptive fuzzy PID control method is superior to the conventional PID in rising time and overshoot etc.The effectiveness of a fuzzy PID controller shows potential application in the future,especially in the presence of model uncertainty or changing dynamics and time-varying parameters.
  • 摘要：Problems may occur in ad hoc network when packets are being multicast. Global routing structure may also produce extra processing cost because the dynamic topology will introduce frequent exchange of routing vector or routing state between nodes. To deal with these problems an improved multicast protocol based on routing grid is designed to ensure that the multicast packets could be sent to destination through dynamic topology network using multicast routing grid.
  • 摘要：The accelerating burn-in and screening method of processing 1 310 nm InGaAsP of laser diodes (LDs) is introduced. It is confirmed that the theory of burn-in and screening is based on the second derivative minimum of burn-in curve, and the new testing method has been given, that is automatic current control (ACC) burn-in and automatic power control (APC) testing. This avoidably bring the errors of testing in only ACC or APC method, which need to monitor and control or test LDs power change by photo-detector (PD) at high temperature, and LDs or PDs must be into the same environment (PD will be burn-in at the same time). Through the experiment, the accelerating burn-in and screening condition of the devices has been confirmed: ACC, 200 mA,100 ℃, 8 h. This raise work efficiency 12 times than Bellcore standard and save testing fee.
  • 摘要：提出了一种改进的时间Petri网计划管理模型 ,综合考虑调度和资源分配 ,以充分发挥FMS的柔性制造能力 .首先根据系统理论 ,区分了两种资源类型 :主角 (主资源 )和配角 (辅助资源 ) ,然后再根据主资源构造FMS的时间Petri网 .这种方法简化了Petri网的构造 ,给出了一个清晰的资源调度流程 ,并且辅助资源的分配可以在调度的同时利用启发式搜索算法给出 .最后 ,给出一个改进的时间Petri网在资源受限情况下进行调度和资源分配的实例 .
  • 摘要：The problem addressed in this paper concerns the extension of widely linear beamforming to the wideband case,developing a wide-focused linear beamformer for the extraction of a wideband second-order(SO)noncircular signal-of-interest(SOI)contaminated by uncorrelated interferences and noise.In the proposed beamformer,the beamforming array observation is first focused to adopt a standard linear minimum variance distortionless response(MVDR)framework.The augmented SOI steering vector then is obtained by estimating the SOI noncircularity parameter with the newly proposed oblique projection with an augmented sparse representation scheme.The covariance matrix of the virtual interference,true interference and noise is further reconstructed using the newly presented complementary spatial spectrum technique.The wideband widely linear spatial filtering is finally realized via MVDR like beamforming.The performance of the proposed beamformer is verified by simulation.
  • 摘要：A polysilicon separated CMOS Schottky barrier diode is designed and tested in this study.By replacing the shallow trench isolation(STI)of a ploy ring,the series resistances of Schottky diodes are reduced,leading to an improvement in cut-off frequencies.The device structure is detailed and a device model is developed.Our analysis on the device shows that the cut-off frequency increases with the decreasing of the Schottky contact area.Based on this observation,the Schottky contact area is set to0.38×0.38μm^2,which is the minimum contact diffusion area allowed by the process flow.The distance between the anode and the cathode is also discussed.Diodes with different dimensions are fabricated and measured.Through extensive measurements,the optimum dimensions are obtained.Bondpads with a reduced area are used to improve the measurement accuracy.The measurement results show that these diodes can achieve a cut-off frequency of 1.5 THz.Thus,it is possible to use these diodes in THz detection.
  • 摘要：A new method of radar netting simulation with hardware-in-the-loop(HWIL)is introduced based on theidea of time reversal. It is the high authenticity,low cost and great simplification in design that the method doesprovide. Along with several paragraphs about the vital features, the model of probability is explained in an analyticalway to find out the feasibility of this method.
  • 摘要：提出了ＣＡＤ／ＣＡＰＰ／ＣＡＭ集成系统并行工程框架结构，介绍了支持并行工程的工具集成、集成产品数据模型、开发过程模型和协调系统的用途，在统一的用户界面管理下，多功能小组成员使用各自的工具进行开发活动。产品开发各相关环节在过程的开始就相互协作，进行必要的信息交换和共享。为了对产品设计、制造过程和支持活动等进行评价和完善，小组成员可定期举行多媒体网络会议，也可用项目协调板系统进行冲突协调。
  • 摘要：Finite state machine theory (FSM) is introduced and applied to global control of electric vehicle. Theoretical adaptation for application of FSM in control of electric vehicle is analyzed. Global control logic for parts of electric vehicle is analyzed and built based on FSM. Using Matlab/Simulink, BJD6100-HEV global control algorithm is modeled and prove validity by simulation.
  • 摘要：A system for simulating and analyzing the Doppler signal of air-target fuse is established by constructing two parts:Doppler signal testing with simulation and Doppler signal analysis.The first part establishes the near-field target characteristic model where the Doppler spectrum in different encounter condition is obtained.The second part mainly deals with a general purpose hardware platform to obtain and process the Doppler signal as well as a software to estimate the Doppler spectrum.The model and the result of Doppler spectrum analysis were verified by experiments.
  • 摘要：To suppress the overshoots and undershoots in the envelope fitting for empirical mode decomposition (EMD), an alternative cubic spline interpolation method without overshooting and undershooting is proposed. On the basis of the derived slope constraints of knots of a non-overshooting and non-undershooting cubic interpolant, together with "not-a-knot" conditions the cubic spline interpolants are constructed by replacing the requirement for equal second order derivatives at every knot with Brodlie's derivative formula. Analysis and simulation experiments show that this approach can effectively avoid generating new extrema, shifting or exaggerating the existing ones in a signal, and thus significantly improve the decomposition performance of EMD.
  • 摘要：Finite state machine theory (FSM) is introduced and applied to global control of electric vehicle. Theoretical adaptation for application of FSM in control of electric vehicle is analyzed. Global control logic for parts of electric vehicle is analyzed and built based on FSM. Using Matlab/Simulink, BJD6100-HEV global control algorithm is modeled and prove validity by simulation.
  • 摘要：针对钢筋混凝土结构，在建立相对简易的非线性断裂破坏模型的基础上，提出并发展了迭代统计线性化的方法（ＩＳＬＭ），解决了其结构的非线性随机动力响应问题。
  • 摘要：A new approach to phase averaging in phase gradient algorithm(PGA)is proposed, which is based onthe fundamental fact that the information of translational phase error is widely contained in every defocusedscatterer in ISAR image. The new approach aims to choose strong scatterers for error phase averaging with athreshold rather than just simply to pick out the strongest point in each range cell, which is not necessarily
  • 摘要：A novel temporal shape error concealment technique is proposed, which can be used in the context of object-based video coding schemes. In order to reduce the effect of the shape variations of a video object, the curvature scale space (CSS) technique is adopted to extract features, and then these features are used for boundary matching between the current frame and the previous frame. Because the temporal, spatial and statistical video contour information are all considered, the proposed method can find the optimal matching, which is used to replace the damaged contours. The simulation results show that the proposed algorithm achieves better subjective, objective qualities and higher efficiency than those previously developed methods.
  • 摘要：The technical improvements are made based on the former CA6110 diesel engine to meet the requirements of Euro Ⅱ emission standards. The performance and emission for CA6DF1 and CA6DF2 are all met the demand of design by improving the fuel, combustion and supercharging systems. The injection system adopts high-pressure pump-pipe-injector injection system. To enhance the injection pressure, the methods of augmenting plunger diameter, decreasing the nozzle hole diameter and reducing the inner diameter of the high-pressure fuel pipe are adopted. The design of combustion chamber and the match of inner fuel distributions with air motion are based on a great deal of experimental database and some simple computer-aided methods, which ensure the optimization of performance and provide the guide for experimental development.
  • 摘要：A novel low radar cross-section(RCS)and high gain patch antenna array is proposed.A pair of slots introduced on the mushroom electromagnetic bandgap(EBG)patch realize polarization-dependency and act as parasitic radiation to enhance the antenna gain.A chessboard-like configuration composed of slot-EBG blocks is further equipped on the antenna array for scattering cancellation.Optimizing the layout pattern enables the designing of a high-gain and low-RCS antenna array using the slot-EBGs.Full-wave simulations validate that a front gain enhancement of more than 2.5.dB in the operating frequency band and low-RCS in a broad frequency band for normal incidence are obtained by the proposed antenna array.
  • 摘要：An improved approach based on support vector machine (SVM) called the center distance ratio method is presented for license plate character recognition. First the support vectors are pre-extracted. A minimal set called the margin vector set, which contains all support vectors, is extracted. These margin vectors compose new training data and construct the classifier by using the general SVM optimized. The experimental results show that the improved SVM method does well at correct rate and training speed.
  • 摘要：寻求一种新型的电敏粒子材料 ,旨在提高电流变流体的电流变效应 .制备一种含有氮、氧、硫类杂原子与大π共轭体系的高聚物———聚萘醌作为电敏粒子材料 .含这种材料的电流变流体在交、直流电场下有明显的电流变效应 ,特别是在交变电场作用下 ,与其它材料相比 ,其剪切应力与电压成良好的二次关系 .实验结果表明 ,含有大π共轭体系的有机半导体高聚物是一种新型的具有开发价值的电敏粒子材料 .
  • 摘要：Neural signal can be used for clinical disease diagnosis,data analysis and real-time life signal monitoring.Its analysis requires high-performance signal processors.Based on the 180 nm standard CMOS technology,a16-channel fully-differential neural recording chip is designed.The chip consists of 16-channel low-noise pre-amplifiers,a multiplexer and a successive approximation register(SAR)ADC.The result shows that the equivalent input-referred noise of recording amplifier is 3.63μV,bringing down noise efficiency factor to 4.24.At 8.5 bits effective number of bit(ENOB),the analog-to-digital converter(ADC)has an SNR of 52.6dB.The core area of the proposed neural recording front-end is about 2.46 mm^2.
  • 摘要：设ｆ（ｚ）是Ｃ上全纯自映射，０和是它的本性奇点，其中本文讨论ｆ（ｚ）的完全不变域的性质，证明了如果Ｄ是ｆ（ｚ）的完全不变域，那么Ｄ一定是二连通的且Ｄ包含了的奇异值集；此外，如果ｆ（ｚ）是有限型的，则Ｄ＝Ｆ（ｆ）．
  • 摘要：在尽可能短的时间内设计出激光驾束反坦克导弹的控制系统 .采用最优化技术 ,通过建立被优化系统的数学模型和选择合适的最优化求解方法 ,利用计算机的高速计算能力和逻辑能力寻找最佳控制器 .仿真结果表明 ,设计出的该型导弹控制系统具有良好的动静态性能 ,很好地满足了战技要求 ,证明最优化技术和计算机技术的结合可以在短时间内设计出性能优良的控制系统 .
  • 摘要：A system is developed to improve the series battery packs uniformities and charging protection and the implementation of battery equalization charging and protection system is also introduced. The functions of equalization charging and overcharging protection are analyzed and the control model of series battery packs equalization charging is setup. The diverting-current and feedback bus voltage are measured during the series Li-ion battery packs equalization charging experiment. The field operation on Electric luxury transit bus BFC6100EV shows that the system betters the battery series charging uniformities and overcharging protection, improves the battery performance and extends the battery life.
  • 摘要：A new method suited for hardware implementation is developed to classify 8 different digital modulation types with raised cosine base-band impulse without knowing the carrier frequency and symbol timing. The normalized histogram of stagnation points for instantaneous parameters is used to recognize both ideal rectangular and raised cosine base-band digital signals. Carrier frequency estimation is used to enhance the recognition rate of phase-modulated signals. In the condition of 10 dB signal noise ratio (SNR), the recognizing rate is over 80%. The new algorithm is suited for hardware implementation.
  • 摘要：After summarizing the current situation of the research on human body modeling, a new dynamic model containing 5 equivalent masses has been proposed and the corresponding dynamic equations has been deduced too. By using this new model, more detailed information about the situation of the human body under impact and vibration can be obtained. The new model solves the problem that transmission functions of forces inside the human body can’t be deduced by using 3-equivalent-mass model. It will find its usage in many applications.
  • 摘要：An eight wheel independently driving steering(8 WIDBS)electric vehicle is studied in this paper.The vehicle is equipped with eight in-wheel motors and a steer-by-wire system.A hierarchically coordinated vehicle dynamic control(HCVDC)system,including a high-level vehicle motion controller,a control allocation,an inverse tire model and a lower-level slip/slip angle controller,is proposed for the over-actuated vehicle system.The high-level sliding mode vehicle motion controller is designed to produce desired total forces and yaw moment,distributed to longitudinal and lateral forces of each tire by an advanced control allocation method.And the slip controller is designed to use a sliding mode control method to follow the desired slip ratios by manipulating the corresponding in-wheel motor torques.Evaluation of the overall system is accomplished by sine maneuver simulation.Simulation results confirm that the proposed control system can coordinate among the redundant and constrained actuators to achieve the vehicle dynamic control task and improve the vehicle stability.

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    • 邮编：100081
    • 联系电话：010-68914374 68914627
    • 邮箱：blgywb@bit.edu.cn
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