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

共 372 条记录，以下是71-80 订阅

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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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Design and implementation of an FFT phase difference measuring method

Design and implementation of an FFT phase difference measuri...

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2014 International Conference on Sensors Instrument and Information technology, ICSIIT 2014

作者： Zhu, Xiong Wei Chen, Hui Min Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing 100081 China

ISBN: (纸本)9783038350392

The conventional phase difference measuring methods in the phase-shift laser range finder are usually implemented with complex hardware circuits and phase discrimination algorithm. In this paper an FFT phase difference measuring method is designed and implemented based on STM32F407VG microcontroller. This method takes the advantage of the pre-set and fixed frequency of the beat signal by setting the analog-to-digital conversion rate precisely and making the input data length of FFT integral multiples of the beat signal period. In this way spectrum correction is no need. The hardware circuits and phase discrimination algorithm is simplified. The test results show that the phase difference measuring accuracy of 1/12000 is achieved. © (2014) Trans Tech Publications, Switzerland.

关键词： Fast Fourier transforms

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Thermodynamics study of laser detector with high rotation speed

Thermodynamics study of laser detector with high rotation sp...

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作者： Yue, M.H. Chen, H.M. Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing100081 China

In this paper, thermodynamics properties of a laser detector applied in 105 mm shrapnel with high rotation speed have been explored. In outer trajectory, aerodynamic heating usually generates because of viscosity, and this is strengthened by high rotation speed of the shrapnel. Thermal strain may occur, which will influence the overall power of the detector and shrapnel. The temperature has been computed by computational fluid dynamics method, and ANSYS Workbench has been applied to obtain thermal strain. In order to disclose the effect of rotation, comparison among simulation results in different conditions are carried out. It is figured out that the temperature increase does not exceed the limit of optical material (polymethyl methacrylate), so the function of laser detector and the power of shrapnel will not be affected. This paper demonstrates the feasibility of material choice of laser detector optical systems. It has important theoretical meaning and practical application value for the design of conventional ammunition laser detector. © 2014 W. S. Maney & Son Ltd.

关键词： Computational fluid dynamics

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An Interference Mitigation Technique for Automotive Radar Based on Empirical Wavelet Transform and Maximum Correlation Coefficient 3

An Interference Mitigation Technique for Automotive Radar Ba...

引用

3rd International Conference on control Theory and Applications, ICoCTA 2023

作者： Zhou, Wen Hao, Xinhong Yang, Jin Yang, Qiuyan Science and Technique on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing China

ISBN: (纸本)9781839539824

With the development of autonomous driving technology, the probability of mutual interference between automotive radars has significantly increased. Aiming at the increasingly serious mutual interference problem among automotive radars, an interference mitigation technique based on empirical wavelet transform and maximum correlation coefficients is proposed. The technique achieves the reconstruction of clean target signals from interfered original signals by constructing an adaptive wavelet band-pass filter bank, and then locates the target echo signal by the maximum similarity coefficient to achieve the reconstruction of the target echo signal. The effectiveness of this technique has been verified through simulation experiments, and the experimental results show that the proposed technique can significantly reduce the impact of interference. Compared with several existing technologies, it further demonstrates the superiority of the proposed technique. © The Institution of Engineering & technology 2023.

关键词： Automotive radar

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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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Research on dynamic response behavior of the fuze with a combined fuze-warhead structure under different impact positions of bullets 4

Research on dynamic response behavior of the fuze with a com...

引用

4th International Conference on Defence technology, ICDT 2024

作者： Wang, Qiang Niu, Lanjie Fan, Chenyang Qv, Zhuojun Xv, Rui Science and Technology on Electromechanical Dynamic Control Laboratory Xi’an Institute of Electromechanical Information Technology Xi’an China

Aiming at the problem of unclear fuse detonation response in the process of different positions of the bullet impact detonator, to carry out research on the dynamic response behaviour of the fuse under the difference of the bullet impact position of the fuze-warhead combination structure. Through experiments and LS-DYNA numerical simulation, the influence of different positions of bullet impact booster on fuze reaction level and output pressure is analyzed. The results demonstrate that in the tests where the bullet made contact with the centre of the fuse, transmitting an explosive charge, the velocity of the bullet is 832 m/s, and the fuse exhibits a partial detonation level in response to the impact. The highest fuse response level occurs when the bullet strikes the centre of the pyrotechnic charge - partial detonation, the lowest fuse response level occurs when the bullet strikes the upper side of the pyrotechnic charge - burning, and the fuse response level occurs when the bullet strikes the lower side of the pyrotechnic charge - deflagration or explosion. The maximum fuse output pressure when the bullet strikes the centre of the pyrotechnic charge - 6.09 GPa, the minimum fuse output pressure when the bullet strikes the upper side of the pyrotechnic charge - 0.98 GPa, and the fuse output pressure when the bullet strikes the lower side of the pyrotechnic charge is 2.76 GPa. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Detonation

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Application of 3D Gaussian Splatting target Reconstruction in short-range detection 4

Application of 3D Gaussian Splatting target Reconstruction i...

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4th International Conference on Defence technology, ICDT 2024

作者： Lou, Wenzhong Li, Chenglong Feng, Hengzhen Ding, Nanxi Zhang, Zihao Ma, Wenlong Wang, Lin Science and Technology on Electromechanical Dynamic Control Laboratory School of Mechatronical Engineering Beijing Institute of Technology Beijing China

The research presented in this paper successfully introduces the emerging 3D reconstruction technology to specific application scenarios, especially for the strict requirements of information authenticity and timeliness for reconnaissance equipment and platforms. Traditional methods have the problems of slow speed and damaged reconstruction quality in processing reconnaissance information. In order to solve the problem of limited computing power of aerial detection platform and improve the reconstruction quality and efficiency of complex scenes, this paper introduces three-dimensional Gaussian Splatting (3DGS) method for testing. Experimental results show that 3DGS has excellent performance in rendering accuracy and real-time performance, which can effectively meet the performance requirements of aerial detection platforms. We tested it on a virtual dataset, and the experimental results show that it can also maintain excellent performance in the real world. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： 3D modeling

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Strong Electromagnetic Protection Circuit for RF Front End of Autodyne Radio Fuze 13

Strong Electromagnetic Protection Circuit for RF Front End o...

引用

13th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2021

作者： Wang, Cheng Chen, Wei Wen, Rui-Hu Science and Technology on Electromechanical Dynamic Control Laboratory China Xi'an Electromechanical Information Technology Research Institute China

ISBN: (纸本)9781665418126

In order to solve the problem that the RF front end of autodyne radio fuze is weak in resisting high-power and energy-based jamming, a design method of electromagnetic protection circuit for RF front end is proposed. The method is to add an electromagnetic protection circuit composed of microwave limiter, RF band-pass filter, and single pole double throw switch, which between RF front-end circuit and transceiver antenna of the autodyne radio fuze. The electromagnetic protection of RF front-end core high-frequency devices is carried out by means of excess energy attenuation, selection of passing frequency, and transmission channel locking. Experimental verification shows that the electromagnetic protection circuit can protect the RF front end of the Autodyne radio fuze in both the frequency domain and the time domain, and improve the survivability of the fuze in the high EM environment. © 2021 IEEE.

关键词： Microwave limiters

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Short-Range Detection of Ferromagnetic Target Based on Tunneling Magnetoresistance Sensor

Short-Range Detection of Ferromagnetic Target Based on Tunne...

引用

2019 IEEE International Conference on Unmanned Systems, ICUS 2019

作者： Fan, Qiang Deng, Jiahao Duan, Zuodong Wei, Xiaowei Xu, Sha Beijing Institute of Technology Science and Technology on Electromechanical Dynamic Control Laboratory School of Mechatronical Engineering Beijing China

ISBN: (纸本)9781728137926

In order to improve the accuracy of short-range ferromagnetic target location and distance-determination, the short-range detection technology of ferromagnetic target based on tunneling magnetoresistance (TMR) sensor is studied in this paper. Based on the analysis of the tunneling magneto-resistance effect principle and the understanding of the relevant magnetic field detecting components, a suitable signal conditioning and signal processing circuit is designed to constitute the TMR magnetic detector. Two kinds of ferromagnetic targets with regular shapes are measured at different distances and orientations, and the measured data are analyzed by curve fitting method. The results show that the output signal amplitude value of the detector is inversely proportional to the cubic power of the relative distance between the detector and the measured target when it is in the near field (no more than 5 meters in this paper). And the influence of the measured target material and detection orientation on the relationship between the two also shows a certain correlation. On the basis of the short-range static detection of general ferromagnetic targets, dynamic tests were carried out with the aim of household cars, the results indicate that the detection distance of dynamic vehicles can reach 7 meters. © 2019 IEEE.

关键词： Ferromagnetic materials

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Orthogonal simulation and experimental study on SLM process parameters for micro-sized high dynamic components 4

Orthogonal simulation and experimental study on SLM process ...

引用

4th International Conference on Defence technology, ICDT 2024

作者： Lv, Sining Lou, Wenzhong Feng, Hengzhen Xiao, Chuan Li, Shiyi Science and Technology on Electromechanical Dynamic Control Laboratory School of Mechatronical Engineering Beijing Institute of Technology Beijing China

Metal Additive Manufacturing (MAM) technology has become an important means of rapid prototyping of special high dynamic complex components. This study employs selective laser melting (SLM) as a technological approach for investigating micro-sized high dynamic components. The parameters that affect SLM process are analysed, mainly including laser power, laser speed, laser diameter, and scan spacing. Based on prior studies, feasible parameter ranges are identified, and an orthogonal experimental design table is established for simulation and experimental co-verification. Range and variance analysis are conducted and the influence ability of each influencing factor is explored from both simulation and experimental aspects. The SLM process model is established using finite element software, taking into account parameters such as residual stress and maximum deformation. The conclusion is drawn that the order of influence of each factor on the preparation of micro-sized high dynamic components is: scan spacing>laser power>laser diameter> laser speed. Samples of components are fabricated and subjected to static testing. The density of the components can reach over 99.15%, and the structural strength can reach 348 MPa, which meet the required standards and confirm the simulation analysis. The results demonstrates that SLM provides a novel manufacturing method for micro-sized high dynamic components. © 2024 Published under licence by IOP Publishing Ltd.

关键词： Selective laser melting

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