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

共 513 条记录，以下是171-180 订阅

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Smoke Diffusion Feature Extraction and Concentration Prediction Method Based on Canny Edge Detection

Smoke Diffusion Feature Extraction and Concentration Predict...

引用

International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Yue Xie Hong Su Tie Li Gang Li Yali Hou Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

In the dynamic intersection scene between laser detector and smoke interference, it is difficult to quantitatively describe the smoke state parameter information of laser detection optical path at different times due to the fluidity and randomness of smoke. This paper proposes a smoke diffusion video feature extraction and concentration prediction method based on Canny edge detection. This method extracts high-speed video of smoke diffusion, detects the edge of the video image and segments the smoke area, analyzes and obtains the corresponding relationship between the shielding effect of smoke diffusion, the number of image pixels in the transmission path and the smoke concentration, By extracting the shielding effect of 1, 2, and 4 typical smoke scenes during diffusion, and analyzing the number of image pixels of a certain transmission path of smoke diffusion, the smoke impact in the dynamic intersection scene of the laser detector and smoke interference is quantified. Subsequently, the laser detector dynamic intersection scene and detection beam parameters can be combined to quantitatively describe the relative position of the laser beam in the smoke transmission path and the concentration state estimation in different forms of smoke scenes, providing important support for the time-correspondence of the echo signal and the optimization of the smoke interference algorithm.

关键词： Laser theory Image edge detection Lasers Interference Detectors Prediction methods Feature extraction Laser beams State estimation Optimization

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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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Design, Optimization and Performance Analysis of Permanent Magnet Synchronous Generator for Fuze

Design, Optimization and Performance Analysis of Permanent M...

引用

2023 IEEE International Conference on control, Electronics and Computer technology, ICCECT 2023

作者： Guo, Zhaoxuan He, Guanglin Ma, Guangsong Zhang, Yulong Qiao, Zenghui Beijing Institute of Technology Science and Technology on Electromechanical Dynamic Control Laboratory Beijing China Xi'An Institute of Electromechanical Information Technology Xi'an China Beijing Electro-Mechanical Engineering Institution Beijing China PLA Strategic Support Force Tianjin China

ISBN: (纸本)9798350399028

In order to solve the power supply problem of the fuze on the small-caliber projectile and improve the reliability of the fuze power supply, a miniaturized fuze turbine permanent magnet synchronous generator (PMSG) is designed in this paper, which is a physical power supply driven by wind. In order to improve the electromagnetic performance of the design schemes, this paper proposes a methodology based on dimensional parameters optimization, optimizes the design parameters based on the Rotational Motor Expert (RMxprt) module, and then conducts electromagnetic performance analysis based on the Maxwell 2D module. Finally, according to the performance parameters, the scheme with 6-pole 9-slot mode is selected among the two schemes with different pole-to-slot ratio, its load line voltage is 21.53 V, and the rated load output power is 47.15 W, which meets the design requirements. © 2023 IEEE.

关键词： Permanent magnets

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Classification Method of Echo and Interference Signal Support Vector Machine Based on Two-Dimensional Characteristic Parameters

Classification Method of Echo and Interference Signal Suppor...

引用

International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Wei Chen Rui-hu Wen Kai-li Yang Zi-tong Li Gan Zhang Xi-yu Wang Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

In order to improve the anti-jamming ability of FM fuze in electronic countermeasures, a support vector machine classification method for echo signal and jamming signal based on two-dimensional characteristic parameters was proposed. In this method, the actual target echo signal and the guided jamming signal of the frequency modulated fuze are taken as the research objects, and the time domain information entropy and frequency domain information entropy are used as the two-dimensional feature parameters, and the two signals are classified and identified by the support vector machine classification method. Through laboratory tests, it can be seen that the classification accuracy can reach more than 95%.

关键词： Time-frequency analysis Frequency modulation Accuracy Support vector machine classification Vectors Object recognition Jamming Information entropy Time-domain analysis Electronic countermeasures

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Sea Surface Scattering Characteristics Based on Slope Statistics of Sliding Window

Sea Surface Scattering Characteristics Based on Slope Statis...

引用

International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Yue Xie Tie Li Bo Tian Tuan Li Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

ISBN: (纸本)9781665418133

In view of the insufficient applicability of the current engineer laser short-range sea surface scattering echo related calculation model, it is impossible to effectively evaluate the performance of the system under different conditions, the simulated wave pool environment is used to obtain the detection system at a fixed height and attitude. Data has limitations such as limited sample points and high funding. This paper proposes a sea surface scattering echo model based on three-point sliding window function statistics. By discretizing the sampling of the wave cross section and obtaining the slope statistics under different intersection conditions, the ray tracing method and the slope value are used to determine the effective surface element. The statistical value of the detection probability and the value of the SNR interval under different sea conditions and attitude angles are obtained by simulation, this provides adaptability assessment and related technical index reference for laser short-range sea surface detection.

关键词： Sea surface Laser theory Laser radar Surface waves Power lasers Scattering Surface emitting lasers

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Experiment Research on Echo Characteristics of Pulsed Laser Fuze in Smoke

Experiment Research on Echo Characteristics of Pulsed Laser ...

引用

International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Chi Zhang Sicheng Gao Juntao Cui Tie Li Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

In this paper, a measurement method based on a smoke chamber is proposed to study the backscattering characteristics of pulsed laser fuze in smoke environment. Firstly, the smoke environment was created in a chamber by burning a known amount of smoke agent whose main chemical composition is red phosphorus. Then, a pulsed laser fuze and auxiliary equipments (visibility meters, lambert reflectors, etc) were arranged to collect echo signals. Finally, a statistical method was used to analyze echo characteristics of the pulsed laser fuze. The experimental results show that the laser fuze prototype used in this experiment does not even have the ability to distinguish a target with low reflectivity (5%) from the smoke environment which was created by burning 0.3g smoke agent, and it cannot discriminate a target with high reflectivity (99%) from the smoke environment when the mass of smoke agent is larger than 4g dues to the high smoke particles concentration. The method proposed in this article provides a new feasible means for the research on anti-interference effect evaluation for smoke of pulsed laser fuze.

关键词： Reflectivity Antenna measurements Meters Pulse measurements Atmospheric measurements Statistical analysis Prototypes Particle measurements Phosphorus Laser pulses

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Research on a fuze anti-jamming strategy under the background of complex ground objects

Research on a fuze anti-jamming strategy under the backgroun...

引用

International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Lei Xia Liang Dai Jin–long Zou Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

ISBN: (纸本)9781665418133

Aiming at the problem of the reduced reliability of the radio proximity fuze under the jamming of complex ground objects,a method of fixed height for laser and radio combined detection is proposed. Using the method of dual-beam separate airspace detection and information fusion,a mathematical model of the fuze's fixed height initiation is established. Through the analysis of the dynamic ground detection model and the ground objects jamming detection model, this design idea and mathematical model against the ground objects jamming effectiveness are confirmed.

关键词： Analytical models Atmospheric modeling Design methodology Measurement by laser beam Reliability theory Reliability engineering Laser modes

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Dual-functional Metamaterial Device controlled by a Singular Switch

Dual-functional Metamaterial Device Controlled by a Singular...

引用

Progress in Electromagnetic Research Symposium (PIERS)

作者： Yongdiao Wen Gang Li Tie Li Science and Technology on Electromechanical Dynamic Control Laboratory Xi’an China

ISBN: (数字)9798350375909

ISBN: (纸本)9798350375916

Herein, a dual-functional terahertz (THz) metamaterial device is presented, the proposed device consists of two heteromorphic arrows, which can switch freely between absorption and polarization conversion controlled by a singular switch. The absorptivity peak (arounds 1.5 THz) and polarization conversion peak (arounds 2.8 THz) will be changed to polarization conversion peak and absorptivity peak with the state of the singular switch, the absorption function and the polarization conversion function can adjust and convert each other, and the maximum values of absorption rate and polarization conversion rate reach to 87.27% and 95.94% respectively.

关键词： Performance evaluation Electric potential Absorption Switches Conductivity control systems Silicon

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Analysis the Influence of Projectile Penetration Velocity and Length - Diameter Ratio on Fuze Overload Signal Adhesion 3

Analysis the Influence of Projectile Penetration Velocity an...

引用

3rd International Conference on Defence technology, ICDT 2022

作者： Zhang, Hongrui Niu, Shaohua School of Electrical and Mechanical Beijing Institute of Technology Beijing100081 China Laboratory of Electromechanical Dynamic Control Beijing Institute of Technology Beijing100081 China

The overload signal of fuze is prone to be adhesion while projectile penetrating multi-layer target with high speed. This problem would cause failure of judgment the layers. The ahhesion phenomenon is related to many factors, such as the penetration speed, parameters of the projectile, the characteris of target and so on. In this paper, the influence of penetration speed and projectile length-diameter ratio on the overlaod signal adhesion is analyzed by numerical simulation. Firstly, the reliability of the material model and its material parameters are verified by simulating the penetration experiments of reduced-scale projectiles. Then three projectile models with different length-diameter ratios are established to compare and analyze the adhesion of overload signals penetrating the five-layer concrete target. The analysis shows that the signal is easy to be adhesion with the increasing of penetrating speed and the length-diameter ratio. However, with the increase of the penetrating speed of the projectile, the influence of its length-diameter ratio on the adhesion gradually decreases. © Published under licence by IOP Publishing Ltd.

关键词： Adhesion

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RCS Simulation of Partly Coated Electrically Large Target with SBR Method

RCS Simulation of Partly Coated Electrically Large Target wi...

引用

International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Tiantian Feng Tie Li Gang Li Yongdiao Wen Haijun He Sihan Zhao Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

In this study, radar cross section of electrically large target partly coated with radar absorbing materials has been simulated and analyzed by using shooting and bouncing ray method. First, the simulation results are validated by comparing with multilevel fast multipole method for electrically small objects. Then the radar cross section of electrically large target is calculated and evaluated in three conditions: perfect electric conductor, partly coated and fully coated. The results indicate that part coating plays an equivalent role in a certain range of angles compared with the full coating, which provides a way to reduce cost of coated stealth plane.

关键词： Radar cross-sections Costs Antenna theory Simulation Radar antennas Conductors Radar applications Coatings

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