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2017 7th International Workshop on Computer science and Engineering, WCSE 2017

作者： Cao, Ronggang Dong, Erwa Xu, Xiangcai Beijing Institute of Technology Beijing China Science and Technology on Electromechanical Dynamic Control Laboratory China

ISBN: (纸本)9789811136719

With the development of science and technology, as a new concept weapon electromagnetic gun has important strategic significance. In the process of launch, there are some damages including wear, corrosion, gouging and transition for the rail-gun. In order to study damage mechanism of the electromagnetic rail-gun during launch, it is necessary to detect the bore profile of electromagnetic rail-gun. The bore of rail-gun has the structural characteristics of closed, invisible and narrow space makes inconvenience for the measurement of the contour, so the online measurement and analysis of the rail-gun bore is very important. By comparing different methods of measurement, laser triangle method of non-contact is the heart of the way using in this paper. The laser triangle method has the characteristics of high precision and non-contact, and can realize on-line nondestructive measurement of arbitrary cross section of the rail bore. Through the comparison of the ideal contour and the measured profile of the electromagnetic rail-gun, the damage profile can be obtained. Using this bore profile scanner of electromagnetic rail-gun designed by this method, we can get two-dimensional profile images.

关键词： Nondestructive examination

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Roll estimation algorithm based on Sage-Husa adaptive Kalman filtering with rotation criteria 13

Roll estimation algorithm based on Sage-Husa adaptive Kalman...

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2017 13th IEEE International Conference on Electronic Measurement & Instruments (ICEMI)

作者： Wang Jiawei Qi Keyu Xu Guotai Qian Rongzhao Yan Jie School of Astronautics Northwestern Polytechnical University Science and Technology on Electromechanical Dynamic Control Laboratory

ISBN: (纸本)9781509050369;9781509050352

According to the problem of increasing error caused by irresistible measuring noise in traditional EKF method within trajectory, a new solution of roll estimation for correction fuze, enlightened by axial output of gyro can be treated as rotation compensation for system noise, using SHAKF with rotation criteria is proposed. Firstly, based on the simulating comparison of estimation precision between traditional EKF and SHAKF methods, the result indicates that the roll measuring error of the new solution conspicuously lower than that of EKF's, the mean value of measuring error is 0.26 deg and the variance of that is 0.97 deg,that means the adaptivity of filter can follow the innovation to make estimated state convergence and eventually decreases the absolute error of roll angle. Furthermore, the new SHAKF algorithm is also verified by in-lab testing with MEMS three-axis turntable under an actually varying rotation setting, and the result shows that the estimation error always below 4.2 degs in dynamic range changing from 30 r/s to 1 r/s.

关键词： 2-D Course Correction Fuze dual-spin stabilized projectile roll estimation Sage-Husa adaptive Kalman filtering rotation compensation

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Design, Simulation and Fabrication of a Time-Delay Device Based on Micro-Channel

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IOP Conference Series: Materials science and Engineering 2019年第4期563卷

作者： Qiaoran Zhao Li Sui Ping Song School of Mechatronical Engineering Beijing Institute of Technology Beijing 100081 China Science and Technology on Electromechanical Dynamic Control Laboratory Beijing 100081 China

With the development of micro-machining technology, the application of microchannel is becoming more and more popular. In this paper, we design a set of time-delay device based on micro-channel and micro-fluidics technology. This paper describes the time-delay device's working principle and analyses the micro-channel's flow characteristics by simulation method based on Coventerware. From studies on the micro-channel's cross section, geometry and dimension parameters, the micro-channel's optimal form and dimension can be obtained. Finally, this paper chooses ultra-machining process to fabricate the time-delay device.

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Theoretical analysis and experimental study of a perforated piezoelectric cantilever

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IOP Conference Series: Materials science and Engineering 2019年第3期563卷

作者： Huaiwei Su Li Sui Ping Song Yousong Lu School of Mechatronical Engineering Beijing Institute of Technology Beijing 100081 China Science and Technology on Electromechanical Dynamic Control Laboratory Beijing 100081 China

Piezoelectric energy harvesters have been studied extensively because they show considerable promise for use in both military and commercial applications. In order to improve the output capability of the piezoelectric energy harvester, the perforated piezoelectric cantilevers were designed in this work. To study how the hole on the cantilever affected the output characteristics, this paper analysed the position and size of the hole separately. The results show that, perforating the cantilever can cause stress concentration of the piezoelectric cantilever, and improve the output capacity.

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Piezoelectric thermoelastic dissipation research of piezoelectric harvester under different vibration

Piezoelectric thermoelastic dissipation research of piezoele...

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

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

关键词： Piezoelectric thermoelastic dissipation research of piezoelectric harvester under different vibration

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Research on Output Characteristics Calculation Method of Micro-Magnetoelectric Generator

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Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of technology 2017年 37卷 198-201and206页

作者： Sui, Li Bian, Xin-Yuan Zhang, Li-Dan Su, Huai-Wei Shi, Geng-Chen Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing100081 China

The small-sized magnetoelectric generator has many advantages such as high power density, small axial size, long-term storage, and good prospects for fuze power supply. The output performance of the magnetoelectric generator is influenced by the coil parameters and the magnetic circuit structure, and it is difficult to get the analytical model. In order to analyze the output performance of magnetoelectric generator theoretically, the output voltage of the generator by method of combining analytical derivation and simulation analysis can be otained. The magnetoelectric generator were designed and machined according to the calculation results. The experimental results of the output performance of the magnetoelectric generator show that the error between the theoretical analysis and experimental results is only 0.2%, which proves the rationality of the calculation method proposed in the present paper. © 2017, Editorial Department of Transaction of Beijing Institute of technology. All right reserved.

关键词： Magnetos

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MEMS Gyro Random Error On-line Modeling Based on Recursive Least-Squares Method of System Identification

MEMS Gyro Random Error On-line Modeling Based on Recursive L...

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2016 2nd Workshop on Advanced Research and technology in Industry Applications(WARTIA 2016)

作者： Jiawei Wang Keyu Qi Kai Shi Ke Liang Jie Yan Northwestern Polytechnical University Science and Technology on Electromechanical Dynamic Control Laboratory

To develop the guided projectile with higher hit precision,promotes gyro’s performance has immensely affection on trajectory *** to the difficulty in method of MEMS angular rate gyro random error on-line modeling,this paper proposes a new algorithm of recursive least-squares method that used in the system identification *** this recursive least-squares method,a few known gyro output data are used to roughly estimate system parameters,then newly obtained data are added to the measurement formula using the recursive algorithm in order to make estimated parameters approach to its *** study indicates that the residual error between outputs of gyro random error model and outputs of real gyro highly approximates white noise,which means the error model accurately describes statistical features of gyro random error and the recursive algorithm realizes on-line modeling.

关键词： Gyro Random Error On-line Modeling System Identification Recursive Least-Squares Method

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High-speed Target Recognition Algorithm and Simulation

High-speed Target Recognition Algorithm and Simulation

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International Conference on Industrial technology and Management science(ITMS 2015)

作者： Shuai Duan Jiahao Deng School of Mechatronical Engineering Beijing Institute of Technology Science and Technology on Electromechanical Dynamic Control Laboratory

The purpose of this paper is devoted to finding a method to recognize the high-speed target for missile in a certain distance. Based on the quasi-electrostatic field characteristics of the capacitance detector, this paper analyzed the output voltage of detection circuit from a capacitance detector. It can be found that, when a high-speed target getting close to the detector, the output voltage of detection circuit changes with certain rules. Our research applied a low-speed static test to obtain the static characteristic data of the target, proposed a high-speed target recognition algorithm and set threshold values based on starting voltage, second derivative and signal duration. The result showed that the algorithm is effective to recognize high-speed missile target.

关键词： quasi-electrostatic field high-speed target recognition capacitance detector algorithm

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Flexible piezoelectric wind energy generator

Flexible piezoelectric wind energy generator

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2015 4th International Conference on Computer, Mechatronics, control and Electronic Engineering (ICCMCEE 2015)

作者： Wang Pengyingkai Sui Li Liu Guohua Shi Gengchen Science and technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology

ISBN: (纸本)9781510813465

This paper proposes the scheme of a flexible piezoelectric generator. The generator using direct piezoelectricity of PVDF, can covert wind power to charge output. It possesses such advantages as: light, small-sized and better flexibility. Using FEA method, this paper carries out modal analysis and harmonic response analysis for the generator. From the modal analysis results, we get the generator's the first for modal are 6.95 Hz, 43.51 Hz, 76.06 Hz and 122.84 Hz. From harmonic response analysis results, we get the amplitude-frequency characteristic curve of the generator's output voltage, and the results show that the generator will generate higher voltage when it vibration in second-order than first –order. In order to verify the accuracy of simulation, a series experiments are carried out. Simulation and experiment on the generator proved the reliability in the wind and shows the excellent quality of generating electric energy.

关键词： Piezoelectric generator Wind Flexible FEA method

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Light scattering characteristic from particles located on a surface

Light scattering characteristic from particles located on a ...

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International Conference on Information technology and Computer Application Engineering, ITCAE 2014

作者： Gong, L. Hou, H.L. Zou, J.L. School of Photoelectric Engineering Xi’an Technological University Xi’an China Science and Technology on Electromechanical Dynamic Control Laboratory Xi’an China

ISBN: (纸本)9781138027176

Based on the Finite Difference Time Domain (FDTD) method, the Generalized Perfectly Matched Lays (GPML) can work very well against the half-space problem about the optical surface and defect particles. The connect boundary condition is reduced by the three-wave method. The reciprocity theorem is applied to the near-far field extrapolation. The angle distributions of double particles with different ratios are shown. Some selected calculations on the effects of the shape are described. © 2015 Taylor & Francis Group, London.

关键词： Finite difference time domain method

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