检索结果-内蒙古大学图书馆

Research on the Characteristics of Wireless Power Transfer in Ferromagnetic Metal Pipe

Journal of Physics: Conference Series 2020年第2期1601卷

作者： Changsheng Li Wei Sun Defu Hu Yong Liu Science and Technology on Electromechanical Dynamic Control Laboratory China Ministerial Key Laboratory of ZNDY Nanjing University of Science and Technology Nanjing 210094 Jiangsu China

With the development of society, radio energy transmission technology has been paid more and more attention. However, in the actual application environment, the surrounding metal environment has a significant impact on the radio energy transmission performance. Based on the technology of MRR radio energy transmission, this paper establishes a two coil radio energy transmission model, and analyzes the influence of metal environment on the coil self inductance L, mutual inductance m and coil resistance R of the radio energy transmission system by finite element simulation. On this basis, aiming at the ferromagnetic metal environment, the steel pipe is selected as the research object to study the relationship between coil diameter and mutual inductance in the metal pipe, and the relationship between coil diameter and metal pipe diameter when the maximum mutual inductance is obtained through fitting analysis. At the same time, through the experiment, the mutual inductance between the coils of the wireless energy system in the steel tube is verified, and the experimental results are very consistent with the theory.

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Research on the Cushioning Effect of Protective Materials under High Impact

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Journal of Physics: Conference Series 2020年第1期1635卷

作者： Runfeng Chen Li Sui Qiang Liu Qiangqiang Qiu Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing China Northwest Industries Group Co. Ltd. Xi'an China

Aiming at the protection of the internal components of the projectile during penetration, the cushion performance of common protective materials such as polyurethane, felt, polytetrafluoroethylene (PTFE), and copper were tested. The test results show that the copper and felt have a certain cushioning effect, which can reduce the acceleration amplitude of 23,000 g by 18% and extend the pulse width of acceleration overload. The cushioning effect of PTFE material is not obvious, but it can play a role in mechanical filtering, making the acceleration curve smoother. Polyurethane material will increase the acceleration amplitude of the buffered part, it is not suitable as a buffer material.

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Analysis for Cooperative Combat System of Manned-unmanned Aerial Vehicles and Combat Simulation

Analysis for Cooperative Combat System of Manned-unmanned Ae...

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2017 IEEE International Conference on Unmanned Systems (ICUS)

作者： Jieru Fan Dongguang Li Rupeng Li Tianyuan Yang Qixian Wang Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology

ISBN: (纸本)9781538631089;9781538631072

Manned-unmanned aerial vehicle cooperative combat has became a focus in the research of combat operation *** maximizes the UAVs' autonomous combat capability and the manned aircraft's command and control capability so that it improves the comprehensive operational *** present,the research on manned-unmanned aerial vehicles cooperative combat is still in exploration *** concept of cooperative combat is incomplete,and further simulation experiments need to be *** this paper,the basic concept of cooperative combat of manned-unmanned aerial vehicle is described,system composition and structure are analyzed,and collaborative combat process is given.A new generalized Lanchester combat model with battlefield sensing coefficient and command & control capacity is *** simulation results show that improving the cooperative combat capability,such as overall sensing capability and command &control capability is beneficial for a combat with relatively smaller *** combat model has theoretical reference value to research information war.

关键词： UAV Combined formation Cooperative engagement Generalized Lanchester combat model Battlefield sensing coefficient

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Roll Estimation for Smart Munitions Using a 3D Magnetometer Only

Roll Estimation for Smart Munitions Using a 3D Magnetometer ...

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2017 IEEE International Conference on Unmanned Systems (ICUS)

作者： Qixian Wang Dongguang Li Rupeng Li Jieru Fan Tianyuan Yang Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology

ISBN: (纸本)9781538631089;9781538631072

Accurate roll angle and roll angular rate are important to improve the target detection accuracy for the smart *** of the limited space in the fuze,only a three-axis magnetometer is used to estimate the roll attitude on the whole *** two methods of roll estimation are proposed and *** is an iterative method based on the attitude transformation matrix,in which the pitch angle and yaw angle at the previous moment are utilized to estimate the roll angle at the moment and then the three angles are kept being *** the other is an extended Kalman filter(EKF) *** state space model is derived by the dynamic characteristic of the smart munitions,and the measurement model is derived by the relationship between geomagnetic field and the output of a three-axis *** simulation results show that the EKF method is able to accurately estimate the roll attitude and is more practical than the iterative method.

关键词： Roll estimation Magnetometer Iterative method EKF Smart Munition

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Analysis of Passive Millimeter Wave Detection Signal Based on Entropy Feature

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IOP Conference Series: Earth and Environmental science 2019年第2期252卷

作者： Yichang Zhao Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

It is easy to be planar metal and ground water mistakenly identified as an armored target, when the signal amplitude value was deemed as a decisive characteristic in passive millimeter wave detection system. Aiming at this problem, this paper proposes a new characteristic which named entropy. The extraction method of entropy is proposed from the point of view of the antenna temperature of typical objects in the millimeter wave passive detection. Studied a certain amount of samples detection signal's entropy. The results showed that the entropy of the armored targets and metal plane and ground water have obvious difference, the armored target recognition research provides a new analysis method and theoretical guidance.

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PID Sliding Mode control for Electro-hydraulic Servo System

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Journal of Physics: Conference Series 2019年第2期1168卷

作者： Wang Xingxu He Guang Gao Rui Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing 100081

In general, an advanced control strategy is necessary for electro-hydraulic servo system to obtain fast and accurate system response. A novel control scheme called PID sliding mode control was proposed by combining conventional sliding mode control and PID control strategy. The linear dynamic mode of electro-hydraulic servo system was established precisely. The PID sliding mode control law was deduced in detail. The chattering problem caused by original sliding mode control was weakened by a continuous PID algorithm. The simulation results of electro-hydraulic servo system demonstrated the effectiveness of the proposed method.

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Study on Discharge Mechanism and Electromagnetic Radiation Characteristics of Trichel Pulsed Discharge Mode Transition

Study on Discharge Mechanism and Electromagnetic Radiation C...

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中国物理学会第二十二届全国静电学术年会

作者： Wang Chuang Chen Xi Tang Kai Li Peng-fei Science and Technology on Electromechanical Dynamic Control Laboratory China Beijing Institute of Technology Beijing 100081People's Republic of China

The Trichel pulse stage is an important stage of negative corona *** the applied voltage increases,there is a significant discharge mode transition process in the Trichel pulse *** this paper,the discharge mechanism and radiation characteristics of different discharge modes of Trichel pulse stage are studied by needle-plate discharge *** characteristics of Trichel pulse current during mode transition were *** the same time,the time-domain waveforms and spectrum characteristics of EM radiation signals are *** discharge mechanism and EM radiation characteristics of the Trichel pulse discharge mode transition process were theoretically *** results show that the Trichel pulse discharge will change from random pulse sequence mode to continuous pulse mode as the applied voltage *** the random pulse sequence mode,the Trichel pulse sequence appears *** randomness of the pulse sequence is due to the random generation of seed *** time domain waveform of EM radiation appears randomly in *** continuous pulse mode,Trichel pulses appear *** field emission caused by a stable cathode sheath is the main reason for maintaining pulse *** EM radiation signals appear *** frequency of the EM radiation signal does not change during the mode *** maximum amplitude of the signal decreases but the average power increases.

关键词： negative corona discharge Trichel pulse mode transition EM radiation

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Roll angle estimation of guided gun-launched projectile using MEMS angular rate gyro and magnetometer

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Journal of Physics: Conference Series 2019年第1期1209卷

作者： R Z Qian G T Xu K H Yang Y Y Xu Science and Technology on Electromechanical Dynamic Control Laboratory 710065 Xi'an China Xi'an Institute of Electromechanical Information Technology Xi'an 710065 China

The previous method to estimate roll angle of guided gun-launched projectile can be completely invalid in case of GPS is disabled in battlefield. To solve that problem, this paper proposes roll angle estimation used MEMS angular rate gyro and magnetometer. Comparing to the previous method with GPS, the addition of magnetometer outputs increases the measurement accuracy, but increases the dimension and nonlinearity of the measurement model. Therefore the Extended Kalman Filter is introduced. Through trajectory simulation, this study indicates that the absolute roll estimation error is less than 7 degrees after 3 seconds in whole flight trajectory, which is completely met the guided system requirement.

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Piezoelectric thermoelastic dissipation research of piezoelectric harvester under different vibration 2

Piezoelectric thermoelastic dissipation research of piezoele...

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2nd International Conference on Electronic Information technology and Computer Engineering, EITCE 2018

作者： Liu, Yuting Deng, Jiahao Ye, Yong Hou, Zhuo Duan, Zuodong Xu, Sha School of Mechatronical Engineering Beijing Institute of Technology Beijing100081 China Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing100081 China College of Information Engineering Shenzhen University Shenzhen518060 China National Key Laboratory of Electronic Measurement Technology North University of China Taiyuan030051 China

Piezoelectric materials are widely used to form piezoelectric energy harvesters. Also, the thermoelastic dissipation always influences the energy harvesting efficiency, during the energy harvest process. Therefore, in this paper, we discuss the effect of thermoelastic dissipation on the piezoelectric harvester through numerical calculation, simulation and experiment. The piezoelectric thermoelastic coupling governing equations under different vibration are derived, which are based on the Euler-Bernoulli beam theory, thermal conduction model and piezoelectric field model. Then, the structure frequency shift and thermoelastic damping are studied via numerical calculation and simulation. Meanwhile, we show the influence of the temperature field on the piezoelectric structure under different vibration modes. Furth more, we research the variations of piezoelectric structure thermoelastic dissipation characteristics under different structure geometry sizes. Based on these analyses, the effect of piezoelectric thermoelastic dissipation on the piezoelectric harvester is researched © The Authors, published by EDP sciences, 2018.

关键词： Energy harvesting

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The vertical placement ultra - thin flameproof baffle of the fuze

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Journal of Physics: Conference Series 2019年第1期1209卷

作者： C C Sun H B Liu X Zhao Xi'an Institute of Electromechanical Information Technology Xi'an 710065 China Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an Shaanxi 710065 China

In order to meet the operational requirements of a new type of intelligent small penetrating submunition fuze with large overload of target base, a new type of ultra-thin vertical fuze flameproof baffle is proposed. Vertical arrangement of fuze ultra-thin flame-proof board uses the three layers of different vertical composite plate structure of metal materials, the overall size for the 1.6mm thickness, the length of vertical is 20mm, upper and lower layer 0.3mm thickness of tungsten-copper alloy plate, respectively, the middle layer of 304 stainless steel. The simulation and test results show that the ultra-thin vertical fuze baffle can resist the penetration overload of 120,000g, and guarantee the safety of 12m dropping and explosion isolation.

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