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

作者： Xia, Lei Dai, Liang Zou, Jin-Long Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an710065 China

ISBN: (纸本)9781665418126

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. © 2021 IEEE.

关键词： Object detection

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MEMS slide block locking mechanism based on elastic supporting structure

MEMS slide block locking mechanism based on elastic supporti...

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2012 2nd International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale, 3M-NANO 2012

作者： Chenyang, Fan Xiaojie, Li Falin, Wang Science and Technology on Electromechanical Dynamic Control Laboratory xi'an 702265 China

ISBN: (纸本)9781467345897

Aiming at the condition that when the Fuze MEMS (micro electro mechanical system) S&A system bears setback/centrifugal overload in an experiment, the clamping head of a setback/centrifugal slide block deforms considerably when entering the clamping seat of a base plate, so that the slide block cannot be locked successfully by the clamping seat of the base plate, this paper presents an MEMS slide block locking mechanism with an elastic supporting structure. The structure of the mechanism, which is contrary to the original structure, is that rigid barbs are arranged on the clamping head, and an elastic supporting arm is arranged on the base plate. The finite element simulation with ANSYS shows that when the clamping head and the clamping arm of the locking mechanism with the elastic supporting structure bear overload, the stress of the dangerous cross-section of the locking mechanism is reduced by 52%, compared with that of the original mechanism, so that plastic deformation is avoided, and the slide block can enter the clamping seat smoothly and locked. Therefore, it can provide selection and reference for the design of locking mechanisms of MEMS S&A system in future. © 2012 IEEE.

关键词： Finite element method

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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...

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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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Automatic modulation recognition of radio fuzes using a DR2D-based adaptive denoising method and textural feature extraction

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Defence technology（防务技术） 2024年第4期34卷 328-338页

作者： Yangtian Liu Xiaopeng Yan Qiang Liu Tai An Jian Dai Science and Technology on Electromechanical Dynamic Control Laboratory School of Mechatronical EngineeringBeijing Institute of TechnologyBeijing 100081China China Research and Development Academy of Machinery Equipment Beijing 100089China

The identification of intercepted radio fuze modulation types is a prerequisite for decision-making in interference ***,the electromagnetic environment of modern battlefields is complex,and the signal-to-noise ratio(SNR)of such environments is usually low,which makes it difficult to implement accurate recognition of radio *** solve the above problem,a radio fuze automatic modulation recognition(AMR)method for low-SNR environments is ***,an adaptive denoising algorithm based on data rearrangement and the two-dimensional(2D)fast Fourier transform(FFT)(DR2D)is used to reduce the noise of the intercepted radio fuze intermediate frequency(IF)***,the textural features of the denoised IF signal rearranged data matrix are extracted from the statistical indicator vectors of gray-level cooccurrence matrices(GLCMs),and support vector machines(SVMs)are used for *** DR2D-based adaptive denoising algorithm achieves an average correlation coefficient of more than 0.76 for ten fuze types under SNRs of-10 d B and above,which is higher than that of other typical *** trained SVM classification model achieves an average recognition accuracy of more than 96%on seven modulation types and recognition accuracies of more than 94%on each modulation type under SNRs of-12 d B and above,which represents a good AMR performance of radio fuzes under low SNRs.

关键词： Automatic modulation recognition Adaptive denoising Data rearrangement and the 2D FFT(DR2D) Radio fuze

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Dual-functional Metamaterial Device controlled by a Singular Switch

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

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2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Wen, Yongdiao Li, Gang Li, Tie Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an710065 China

ISBN: (纸本)9798350375909

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. © 2024 IEEE.

关键词： Polarization

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Anti-jamming Method of Radio Fuze Based on KNN 4

Anti-jamming Method of Radio Fuze Based on KNN

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4th International Conference on Intelligent control, Measurement and Signal Processing, ICMSP 2022

作者： Liu, Bing Hao, Xinhong Yang, Jin Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing China

ISBN: (数字)9781665486583

ISBN: (纸本)9781665486583

In order to improve the anti-jamming ability of radio fuze and maximize the effectiveness of radio fuze in complex electronmagnetic environments, it is necessary to distinguish targets and jamming signals effectively. This research takes a sample of FM radio fuze as an example, mainly considers the sine amplitude modulation frequency-sweeping (Sine-AM) jamming signal and noise amplitude modulation frequency-sweeping (Noise-AM) jamming signal, which are pose the greatest threat to the FM radio fuze. The frequency exponential entropy and norm entropy of the fuze output signal are extracted. Then these features are input to K nearest neighbors classifier, in this way, the target signals and jamming signals can be effectively distinguished, Further improved the FM radio fuze ability to anti-jamming signal. The expermient result shows that using KNN classifier can get a classification accuracy more than 99%. © 2022 IEEE.

关键词： Amplitude modulation

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Research on a projectile-borne measuring apparatus for electromagnetic launcher 4

Research on a projectile-borne measuring apparatus for elect...

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4th International Conference on Mechanical, Electric and Industrial Engineering, MEIE 2021

作者： Cao, Ronggang Hu, Xueyi Dong, Erwa Ma, Xiao Zhou, Yu Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing China

In order to evaluate the electromagnetic launch effectiveness and understand the corrosion damage of the electromagnetic launcher, it is necessary to master the magnetic field data in the bore. At present, there is no related research on the measurement of the bore magnetic field of the electromagnetic launcher. Therefore, a small-scale projectile-borne measuring apparatus based on B-dot probe is developed in this paper. This apparatus uses FPGA as the core. Through the static magnetic field measurement experiment, the data of the induced voltage and the induced magnetic field can be obtained. The projectile-borne magnetic field measuring apparatus designed in this paper can accurately measure the bore magnetic field of the electromagnetic launcher, which lays the foundation for further analysis of the influence of the electromagnetic field in the bore on the launch effect and investigation of the corrosion damage of the electromagnetic launcher. © Published under licence by IOP Publishing Ltd.

关键词： Projectiles

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Numerical simulation of the delay arming process of initiating explosive brakes

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Journal of Beijing Institute of technology 2015年第1期24卷 4-7页

作者：王茹王亚斌 National Key Laboratory on Electromechanical Dynamic Control School of Mechatronic EngineeringBeijing Institute of Technology

The delay arming process of initiating explosive （ IE ） brakes for fuse is complex and hard to be verified. A numerical simulation model of IE brakes was established based on the arbitrary La- grange-Euler method. The model included the structure, the air filed, etc. The simulation boundary conditions were defined, including the contacts, blasting parameters of the explosive and the fluid- solid coupling interface. The simulation results show that the shear pin of the chosen IE can be cut off. When the piston needs to move 0.8 cm, the time set to the delay arming of the IE brakes model is about 40μS. The maximum displacement of the piston is 1. 17 cm. The model provides basis for parameters design and further improvement of IE brakes.

关键词： initiating explosive brakes numerical simulation ALE delay arming

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An Overall Weighted Fusion Algorithm Based on dynamic Optimal Estimation

An Overall Weighted Fusion Algorithm Based on Dynamic Optima...

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

作者： Wang, Zehu He, Guanglin Liu, Yukuan Beijing Institute of Technology Science and Technology on Electromechanical Dynamic Control Laboratory Beijing China

ISBN: (纸本)9798350399028

Based on the background of cooperative detection of target by multiple UAVs, this paper proposes an efficient multi-sensor data fusion algorithm, which is called the overall weighted fusion algorithm based on dynamic optimal estimation (abbreviated as DOE-OWFA) Based on the weighted fusion by the least squares method, the algorithm makes full use of the state estimation property of Kalman Alter for data processing and state estimation. In order to evaluate the performance of the algorithm, we conducted simulation tests with the help of MATLAB. The simulation results show that the algorithm proposed in this paper has higher fusion accuracy and better robustness compared with the same type of algorithms. © 2023 IEEE.

关键词： State estimation

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Application of Ulaby Model in Simulation of Altimeter Fuze 13

Application of Ulaby Model in Simulation of Altimeter Fuze

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

作者： Gao, Sicheng Li, Tie Li, Wei Tian, Bo Science and Technology on Electromechanical Dynamic Control Laboratory Shaanxi Xi'an710061 China

ISBN: (纸本)9781665418126

In order to solve the problem that the application mechanism of scattering information of background of surface features in the design process of altimeter fuze is not clear, a simulation method of altimeter fuze based on Ulaby model is proposed. This method is based on the Ulaby model to model the target characteristics of background of surface features. The target characteristics information is used as the input information of fuze detection in the missile target encounter process, adopting the digital signal processing method. The response characteristic model of fuze target detection is established, and the response simulation of fuze detection to the time-varying scattering characteristics of background of surface features in the process of missile target encounter is carried out, and the response characteristics of echo and IF signal processing are clearly reproduced. The experimental results show that Ulaby model can be used to distinguish different background of surface features types. The target type information is added as another dimensional fuze detection information, and the detection accuracy is further improved by combining the height information. © 2021 IEEE.

关键词： Digital signal processing

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