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检索条件"机构=Science and Technology On Electromechanical Dynamic Control Laboratory"

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Time-frequency domain properties on a compact multi-port IR-UWB antenna

Time-frequency domain properties on a compact multi-port IR-...

引用

Microwave, MTT-S International Symposium

作者： Hong-Li Peng Jian Ping Zhao Ni Ma Jinlong Zou Junfa Mao Key Lab of Ministry of Education for Research of Design and EMC High Speed Electronic Systems Shanghai Jiao Tong University Shanghai China Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

A novel compact multi-port impulse radio ultra wideband (IR-UWB) antenna is presented in this paper. Its EM simulated models is developed through properly designed magneto-electric dipole. The time-frequency domain properties of this antenna for its specific multi-port excitations are studied in details by using simulations. Its VSWR and gain patterns are obtained and verified by the measurements. It is shown that the antenna is suitable for near field ground penetrating radar (GPR) applications.

关键词： Magnetoelectric effects Ultra wideband antennas

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On Experiment Design for Single Carrier and Multicarrier Systems

On Experiment Design for Single Carrier and Multicarrier Sys...

引用

European control Conference

作者： Dimitrios Katselis Cristian R. Rojas Boris I. Godoy Juan C. Aguero Coordinated Science Laboratory & the Industrial and Enterprise Systems Engineering Department University of Illinois at Urbana-Champaign ACCESS Linnaeus Center School of Electrical Engineering KTH Royal Institute of Technology Centre for Complex Dynamic Systems & Control The University of Newcastle

ISBN: (纸本)9781467371605

In this paper, the problem of experiment design in single input single output (SISO) single carrier (SC) systems under a deterministic channel assumption is investigated and several connections with optimal preamble designs in multicarrier (MC) systems are established. In the context of SC systems, we derive optimal input sequences for the least-squares (LS) channel estimator under an input energy constraint. We then establish certain connections to optimal input designs for LS frequency domain channel estimation in MC systems. These connections reflect similarities between SC and MC systems both quantitative, i.e., in the achievable mean square error (MSE) performance, as well as qualitative, i.e., in the actual optimal input sequences. Simulations are provided to support the derived results.

关键词： Experiment design Least squares Multicarrier systems Training sequence

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Study on output of LD-pumped passively Q-switched subnanosecond microlasers

引用

4th International Conference on Optical, Electronic Materials and Applications, OEMA 2013

作者： Cheng, He-Jiao Chen, Hui-Min Cai, De Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing 100081 China

ISBN: (纸本)9783037857342

In recent years, the laser fuze has been widely used in minor caliber mortar projectiles and bombs because of its high accuracy in distance measurement, strong ability to resist electromagnetic interference, high angular resolution and good concealment. As a result, it becomes an irreversible tendency to miniaturize the high power of the laser, especially in military applications. This paper aims to study the factors on the output characteristics of the microlasers. Based on the variation of the inversion density of the particle in the resonant cavity derived from the oscillation equation of the LD-pumped passively Q-switched Cr4+:YAG/ Nd:YAG laser, this paper summarizes some key factors which have impacts on the output of LD-pumped passively Q-switched subnanosecond microlasers, including the initial transmission of the absorber, the reflection of output coupler, the length of the cavity and the radius of the pumping laser beam, and gives the conclusion of the simulation, which provides the basis for the design of the passive Q-switched micro lasers which have high power, high repetition frequency and narrow pulse width. © (2013) Trans Tech Publications, Switzerland.

关键词： Military applications

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Numerical analysis of deformation and failure of penetration into concrete target by projectile

Numerical analysis of deformation and failure of penetration...

引用

2013 International Conference on Intelligent Materials and Measurement, ICIMM 2013

作者： Gao, Song Wang, Ya-Bin Li, Xiu-Feng National Key Laboratory on Electromechanical Dynamic Control Beijing Institute of Technology Beijing 100081 China

ISBN: (纸本)9783037858448

Penetration is an important topic in the military and protection engineering field. Based on *MAT_PLASTIC_KINEMATIC of LS-DYNA program, this report studies effects of failure strain of the material parameters on structure of penetrating projectile. By establishing a group of numerical models about 45 steel hemispherical projectile penetrating semi-infinite concrete targets, this research aimed at analyzing effects of different failure strain values related to the destruction of the internal bracket structures of this projectile. At the same time, it studied the criterion of failure on finite dynamic program. The numerical results show that the use of failure strain in this model can well simulate damage of internal bracket structures of the projectile. Test was carried on based on this conclusion, which showed that bracket plate is subjected to shear failure in process of penetration, and numerical simulation was consistent with the experimental results. © (2013) Trans Tech Publications, Switzerland.

关键词： Projectiles

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Detection of moving objects in infrared image sequences using two-dimensional modified double channel motion detector network

Detection of moving objects in infrared image sequences usin...

引用

International Conference on Modelling, Identification and control (ICMIC)

作者： Dongguang Li Peng Xu Guojie Qin Daokun Yang National Key Laboratory of Science and Technology on Electomechanical Dynamic Control Beijing Institute of Technology Beijing Beijing CN China South Industries Research Academy China China Academy of Electronics and Information Technology Beijing China

Moving objects detection in a complicated surrounding is one of the most significant issues to be solved in the infrared target recognition because of the time-varying background. Biomimetic approach is a promising solution for tackling this problem. Visual detection and processing of motion in flies is thought to occur based on an elementary delay-and-correlate operation at an early stage in the visual pathway, which is the so-called `Reichardt detector'. However, the original Reichardt detector is a coarse description of the visual system of the fly. In this paper, we studied moving target detection method in a complicated background using a two-dimensional 2 quadrant motion detector network consisting of a grid of modified double channel motion detectors. At first, the scheme of modified double channel motion detector is analyzed and general properties of the modified double channel motion detectors are presented in detail. Then, the modified double channel motion detectors are interconnected in a grid to form a two-dimensional detectors network that can be used to model motion in two-dimensional scenes. The infrared image sequences including moving vehicle objects in the complicated background are used to confirm the proposed method in the experiment. The experimental results illustrate that, the proposed method achieves much better detection performance in infrared frames than the original Reichardt's model. Moving object could be detected in infrared frames without the interference of background.

关键词： Visualization Analytical models Artificial neural networks Mathematical model Delays Lead

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Optimization Research of Feeder Service Route for Container Ship in Marine Simulator

Optimization Research of Feeder Service Route for Container ...

引用

2014 International Conference on Information technology and Management Engineering(ITME 2014)

作者： Xin-yu ZHANG Zi-jian GUO Ling-ling JIANG Jin-tao WANG Key Laboratory of Maritime Dynamic Simulation and Control of Ministry of Transportation Dalian Maritime University Faculty of Infrastructure Engineering Dalian University of Technology College of Environmental Science and Engineering of Dalian Maritime University

Large container ships can only be anchored in deep trunk port, which needs container feeder service to transit and transport the cargos from of trunk ship, thus creating a shaft- spoke maritime transport mode. So, the electronic chart system in marine simulator is adopted to design routes and calculate the ETA of two ports, with consideration of vessel maneuverability and actual turning radius. In considering the limit of time it takes from the feeder port to the hub port and the ships capacity, the shortest ship sailing time is taken as the objective function, and then one mixed integer programming model is established for the container vessels regional transportation. By using the heuristic tour route coding, its solution based on genetic algorithms is presented, and it can achieve route selection. Finally, with ship capacity 150 TEU, the numerical evaluation was conducted by the operation of the ship program calculation, and the results show that when after 95 iterations the total journey time reached minimum 403.0h with 6 optimal routes.

关键词： Estimated time of arrival Marine simulator Route optimization Genetic algorithm

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An environment monitoring system based on wireless sensor networks

引用

2013 International Conference on Advances in Materials science and Manufacturing technology, AMSMT 2013

作者： Liu, Jin Li, Lian Jie Liu, Yu Xin Key Laboratory of Electromechanical Dynamic Control Beijing 100081 China School of Mechatronical Engineering Beijing Institute of Technology Beijing 100081 China

ISBN: (纸本)9783037857984

Based on the wireless sensor network technology, an environmental monitoring system with localization and magnetic detection capabilities is developed for unattended remote environment monitoring and control. In the system, monitoring nodes adopt the CC2420 to build a low-power, short-range jump, self-organizing wireless network, and the gateway node uses the GPRS technology to link the front monitoring network to the rear monitor center. Meanwhile, a component-based software framework is provided to facilitate the protocol implement and to improve expansibility. The experiment demonstrates that the supervisory system can realize the environmental control duty and has a good application value. © (2013) Trans Tech Publications, Switzerland.

关键词： Environmental management

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A robust controller based on advance model-free adaptive method for linear motion systems

A robust controller based on advance model-free adaptive met...

引用

World Congress on Intelligent control and Automation (WCICA)

作者： Rongmin Cao Huixing Zhou Zhongsheng Hou Junru Wang Beijing Key Laboratory of High Dynamic Navigation Technology Beijing Information Science & Technology University Beijing China The school of engineering China Agricultural University Beijing China Advanced Control System Lab Beijing Jiaotong University Beijing China School of Automation Beijing Information Science & Technology University Beijing China

The proposed advance model-free adaptive control algorithm is able to regain the control performance when some undesirable situations occur in linear motion system. A case study is employed in the development which involves the control of a linear motor setup using two control algorithms: a nominal control algorithm based on PID tuned for high performance, and the robust accommodating control based on advanced model free adaptive control (AMFAC). Compared with PID control, AMFAC is more robust to disturbances such as vibrations for fast time-varying systems. Simulation results based on the model of a real linear motion system setup are provided to show the effectiveness of the approach.

关键词： Adaptation models Adaptive control Semiconductor process modeling control systems Robustness Educational institutions Real-time systems

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Analysis of Light Scattering Properties about Dent Nanoparticles upon Wafer

Analysis of Light Scattering Properties about Dent Nanoparti...

引用

2013 International Conference on Intelligent Materials and Mechatronics(IMM 2013)

作者： Lei Gong Honglu Hou Jinlong Zou Science and Technology on Electromechanical Dynamic Control Laboratory School of Photoelectric Engineering Xi’an Technological University

The light scattering properties of the dent nanoparticles upon wafers is discussed in this paper. Taking the advantage of the Bobbert-Vlieger(BV) theorem, the scattering model between wafer and dent nanoparticles is established. The scattering process is analyzed and the scattering coefficients are derived by using of the vector spherical harmonic function. The differential scattering cross section(DSCS) of the dent nanoparticles upon the wafer is calculated which is compared with the extended Mie method proved the validity of the method and the influences of the dent position, dent scale and scattering angle on the DSCS are analyzed numerically in details. The result is shown that the effect of the dielectric is smaller than the metal. Therefore, the material of the defect and the shape can be extracted by calculate the DSCS, which provide strong theoretical foundation to the nondestructive detector engineer.

关键词： Scattering properties BV theory Dent nanoparticles Wafer

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Numerical Analysis of Deformation and Failure of Penetration into Concrete Target by Projectile

Numerical Analysis of Deformation and Failure of Penetration...

引用

2013 International Conference on Intelligent Materials and Measurement(ICIMM 2013)

作者： Gao Song Wang Ya-bin Li Xiu-feng National Key Laboratory on Electromechanical Dynamic Control Beijing Institute of Technology

Penetration is an important topic in the military and protection engineering field. Based on *MATLASTICINEMATIC of LS-DYNA program, this report studies effects of failure strain of the material parameters on structure of penetrating projectile. By establishing a group of numerical models about 45 steel hemispherical projectile penetrating semi-infinite concrete targets, this research aimed at analyzing effects of different failure strain values related to the destruction of the internal bracket structures of this projectile. At the same time, it studied the criterion of failure on finite dynamic program. The numerical results show that the use of failure strain in this model can well simulate damage of internal bracket structures of the projectile. Test was carried on based on this conclusion, which showed that bracket plate is subjected to shear failure in process of penetration, and numerical simulation was consistent with the experimental results.

关键词： Failure strain Numerical simulation Penetration

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