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31st International Symposium on Ballistics, BALLISTICS 2019

作者： Zhang, Zhibiao Meng, Cheng Wang, Yushi Science and Technology on Electromechanical Dynamic Control Laboratory China School of Mechanical Engineering Nanjing University of Science and Technology Jiangsu Nanjing210094 China

ISBN: (纸本)9781605956107

The fabrication error and assembly error of warhead and fuse will cause the dynamicunbalance of howitzer projectile, which will bring a negative impact on the safety andreliability of fuse. In order to obtain the motion of a certain 155 mm howitzer projectile onthe exterior ballistics, the six-dimensional rigid body motion equations of the projectile werestudied. The aerodynamic parameters which needed for the six-dimensional rigid bodymotion equations of the projectile's exterior ballistics need to be obtained by ***, the credibility of the simulation method is verified in this paper. Then theaerodynamic parameters of the projectile are obtained by numerical simulation of theprojectile flow field. When solving the six-dimensional rigid body motion equations ofprojectile exterior ballistics, the dynamic unbalance of projectile is considered. Thecalculation results are very important for the safety and reliability of fuze on the projectileunder the condition of dynamic unbalance. © 2019 by International Ballistics Society All rights reserved.

关键词： Projectiles

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Evaluation Method for Anti-Chaff Jamming Performance of Typical Radio Fuze 4

Evaluation Method for Anti-Chaff Jamming Performance of Typi...

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4th International Conference on Defence technology, ICDT 2024

作者： Xiangli, Wenting Su, Hong Li, Tie Hou, Yali Cui, Dong Science and Technologo on Electromechanical Dynamic Control Laboratory Xi’an China Xi’an Institute of Electromechanical Information Technologhy Xi’an China

Chaff jamming is one of the common countermeasures in electronic warfare against radio fuze. Currently, there is no unified and effective evaluation criterion and method for the anti-chaff jamming capability of radio fuze. An evaluation method for the anti-chaff jamming performance of radio fuze during the missile-target encounter trajectory phase is proposed. A dynamic echo model of chaff clouds was established. The echo signals of the chaff cloud and the target were calculated and the fuze actuation were simulated and analyzed. The results show that this evaluation method can effectively assess the anti-chaff jamming performance of typical radio fuze. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Jamming

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Monte Carlo Analysis and Optimization of Inertial Switch Tolerance of a Proximity Fuze 4

Monte Carlo Analysis and Optimization of Inertial Switch Tol...

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4th International Conference on Defence technology, ICDT 2024

作者： Zhao, Xin Sa, Haijing Qiu, Liliang Zhang, Wenyi Song, Rongchang CSSC Systems Engineering Research Institute Beijing China Science and Technology on Electromechanical Dynamic Control Laboratory beijing China

Aiming at the low operation rate of the firing mechanism of ammunition fuze, robustness analysis and probabilistic design methods were introduced into the fuze design to carry out system simulation research on performance prediction and optimization of the firing mechanism of ammunition fuze. In this paper, the dynamic model of the inertial impact switch of a proximity fuze is established, and the mechanism can be reliably triggered under nominal values by simulation method. Based on the Monte Carlo simulation of dimensional tolerance distribution, the trigger performance is evaluated. The contribution rate of each dimension variable to the target value is obtained by using the optimal Latin hypercube experiment design, and the variable tolerance with greater contribution rate is optimized by Pointer algorithm. After optimization, the range of variable Jdxh_f was optimized from 0.1274 to 0.1666 to 0.1274 to 0.1556. Finally, the optimized results were validated, with a uniform distribution yielding 0.003193517N, a bimodal distribution yielding 0.2230769N, and a normal distribution yielding *** validation analysis of these results shows that the target value distribution data after optimization meets the design *** study seeks a balance between performance reliability and manufacturing cost, which is of great significance to improve product performance and reduce manufacturing cost. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Normal distribution

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4th International Conference on Computer science, Electronic Information Engineering and Intelligent control technology, CEI 2024

作者： Zhou, Xulang Wen, Yongdiao Hu, Wenhui Li, Gang Li, Tie Xidian University School of Electric Engineering Xi'an China Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

ISBN: (纸本)9798350378542

To address the challenge of effectively evaluating ISAR image similarity under multi-precision fusion processing, this paper proposes a Fine-Grained Weighted Entropy (FGWE)-based image similarity evaluation method. This approach fully considers the subtle structural features in radar images by assigning different entropy weights to various regions, thereby emphasizing the differences of the important structural information and then reflecting accurately the similarity between images. Experimental results demonstrate that, compared with traditional methods, when FGWE was used to evaluate radar images, it showed a greater sensitivity to structural feature differences, and more accurately trapped the image information loss which derived from multi-precision processing. The mentioned FGWE reveals great potential in the field of radar image precision evaluation. © 2024 IEEE.

关键词： Radar imaging

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Modeling and Analysis of a Non-linear Electret Electrostatic Energy Harvester 3

Modeling and Analysis of a Non-linear Electret Electrostatic...

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3rd IEEE International Conference on Automation, Electronics and Electrical Engineering, AUTEEE 2020

作者： Niu, Shaohua Gao, Chunhui Chen, Jian Beijing Institute of Technology Science and Technology on Electromechanical Dynamic Control Laboratory Beijing China Beijing Power Machinery Institute Beijing China

ISBN: (纸本)9781728198279

With the rapid development of MEMS and CMOS sensors and improvement of data processing capabilities we have entered the era of the internet of everything (IoE), and the ensuing problem of sensor power supply has attracted more and more people's attention. Vibration energy harvester that can directly convert vibration energy into electrical energy from the environment have become hot topics in recent years because of the short life, large size, long-term storage and other shortcomings of traditional chemical batteries. The electrostatic vibration energy harvester is a typical harvester, which always uses beam structure to capture the environmental energy. However the working bandwidth of traditional beam is always relatively narrow, while the vibration frequency range of environment is relatively wide. Thus the capture energy efficiency of traditional beam structure is relatively low. In this paper, a nonlinear method is introduced into electret electrostatic energy harvester, which employed magnetic body structure to introduce nonlinear force. In the paper, the model of this nonlinear harvest is built, and its characteristics are analyzed. According the analysis result, magnetic force introduced can improve capture energy bandwidth, moreover, repulsive force expands the bandwidth larger than attractive force. © 2020 IEEE.

关键词： Bandwidth

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Numerical analysis of deformation and failure of penetration into concrete target by projectile

Numerical analysis of deformation and failure of penetration...

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2013 International Conference on Intelligent Materials and Measurement, ICIMM 2013

作者： Gao, Song Wang, Ya-Bin Li, Xiu-Feng National Key Laboratory on Electromechanical Dynamic Control Beijing Institute of Technology Beijing 100081 China

ISBN: (纸本)9783037858448

Penetration is an important topic in the military and protection engineering field. Based on *MAT_PLASTIC_KINEMATIC of LS-DYNA program, this report studies effects of failure strain of the material parameters on structure of penetrating projectile. By establishing a group of numerical models about 45 steel hemispherical projectile penetrating semi-infinite concrete targets, this research aimed at analyzing effects of different failure strain values related to the destruction of the internal bracket structures of this projectile. At the same time, it studied the criterion of failure on finite dynamic program. The numerical results show that the use of failure strain in this model can well simulate damage of internal bracket structures of the projectile. Test was carried on based on this conclusion, which showed that bracket plate is subjected to shear failure in process of penetration, and numerical simulation was consistent with the experimental results. © (2013) Trans Tech Publications, Switzerland.

关键词： Projectiles

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Research on Miniature Three-Axis Switch Used in Fuze 4

Research on Miniature Three-Axis Switch Used in Fuze

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4th International Conference on Defence technology, ICDT 2024

作者： Liang, Hanwen Jia, Senqing Guo, Hua Wang, Lifang Song, Rongchang Zhou, Xingzong Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing China Electromechanical Dynamic Control Laboratory Xi'an China Huaihai Industry Group Co. Ltd. Changzhi China Beijing Power Machinery Research Institute Beijing China

This paper proposes a miniature three-axis switch based on precision mechanical processing technology. A dynamic analysis of the three-axis switch is conducted, and the standard S-type micro-spring is optimized for design requirements. A contact enhancement design with flexible contacts on the mass block is proposed, and the structural design of a layered three-axis sensitive three-axis switch is completed. Finite element simulation methods are used to analyze the stiffness modal properties, multi-directional closure thresholds, and contact performance of the three-axis switch. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Precision engineering

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Three-dimensional suboptimal guidance law for fly-over and shoot-down smart ammunition via virtual target

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Journal of Beijing Institute of technology 2014年第4期23卷 443-451页

作者：杨喆吴炎烜范宁军王正杰 National Key Laboratory of Science and Technology on Electro-mechanical Dynamic Control School of Mechatronic EngineeringBeijing Institute of Technology

An optimal burst height is required for the fly-over and shoot-down smart ammunition with an EFP warhead at the instant of explosion which brings a special requirement to the miss distance of the terminal guidance law. In this paper, a guidance law based on the virtual target scheme is proposed. First, the practical pursuit-evasion issue between the ammunition and the target with specific miss distance is transformed into a virtuai pursuit-evasion problem with zero miss distance. Secondly, a complete three-dimensional pursuit-evasion kinematics model is established without any simplifications. And then, a suboptimal guidance law is designed based on the θ-D method which has constraints of the elevation and azimuth angular velocity of the virtual line of sight （LOS）. Finally, in order to verify the performance of the proposed guidance law, three test cases are conducted. Numericai results show that under the proposed terminal guidance law, the smart ammunition not only can fly above the target with an optimal burst height but also have a smaller normal acceleration on the terminal trajectory.

关键词： three-dimensional guidance law virtual target fly-over and shoot-down θ-D 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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Structural Optimization Design of H-type Piezoelectric Actuator Based on APDL 8

Structural Optimization Design of H-type Piezoelectric Actua...

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8th Annual International Conference on Material science and Engineering, ICMSE 2020

作者： Rui, Suyuan Wang, Xinjie School of Mechanical Engineering Nanjing University of Science and Technology Nanjing210094 China Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an710065 China

Aiming at the problem of low efficiency in optimizing the H-type piezoelectric actuator with the "trial method", this article uses a program written in the APDL (ANSYS Parametric Design Language) to optimize the structure of the piezoelectric actuator. First, a parametric finite element model is established based on the initial data values of the mover structure. Modal analysis and sensitivity analysis are performed to determine the design variables. Then, the objective function is determined based on the frequency consistency of the two-phase working modes. Finally, based on the optimization tool proposed in this paper, the structure of the H-type piezoelectric actuator is optimized. The optimization results show that the optimization program based on APDL can achieve the optimal design requirements of the H-type piezoelectric actuator and shorten the time required for structural optimization design. © Published under licence by IOP Publishing Ltd.

关键词： Piezoelectric actuators

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