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30th International Symposium on Ballistics, BALLISTICS 2017

作者： Li, Dong-Guang Li, Ru-Peng Shi, Yong-Hui Huo, Peng-Fei Beijing Institute of Technology Science and Technology on Electromechanically Dynamic Control Laboratory Beijing100081 China Xi'an Institute of Electro Mechanical Information Technology Xi'an710065 China

ISBN: (纸本)9781605954196

The investigation in attack angle induced by canards control force is an important issue for trajectory correction technology. This paper focuses on the attack angle response of projectile considering not only durable force but instantaneous force. Following the introduction of the projectile nonlinear dynamic models in the non-rolling reference frame, the equations of attack angle under control are established. The initial angular rate is derived through a model with conservation of angular momentum. The analytical solutions of attack angle under the two conditions are presented. The analytical expression of the relationship between trajectory shift and attack angle is presented. When instantaneous force is taken into consideration, the magnitude of the maximum angle of attack is raised by 10.2%, the steady-state time is extended by 15.2%, whereas the trajectory under two kinds of condition varies little.

关键词： Projectiles

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Research on the Cushioning Effect of Protective Materials under High Impact 6

Research on the Cushioning Effect of Protective Materials un...

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2020 6th International Forum on Engineering Materials and Manufacturing technology, IFEMMT 2020

作者： Chen, Runfeng Sui, Li Liu, Qiang Qiu, Qiangqiang 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. © Published under licence by IOP Publishing Ltd.

关键词： Copper

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Numerical study on ethylene-air continuous rotating detonation in annular combustors with different widths

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Journal of Zhejiang University-science A(Applied Physics & Engineering) 2022年第5期23卷 388-404页

作者： Wei-jie FAN Wei-dong LIU Hao-yang PENG Shi-jie LIU Jian SUN Science and Technology on Scramjet Laboratory College of Aerospace Science and TechnologyNational University of Defense TechnologyChangsha 410073China State Key Laboratory of Aerospace Dynamic Satellite Control CenterXi’an 710043China

To investigate the impact of combustor width on continuous rotating detonation(CRD)fueled by ethylene and air,a series of 3 D simulations are conducted by changing the inner cylinder radius of an annular combustor while retaining the same outer cylinder *** results show that the CRD wave propagates more steadily and faster as the combustor width *** high-temperature zone at the backward-facing step preheats the propellants and contributes to the steady propagation of the CRD wave in 25-and 30-mm wide *** highest and the lowest velocities are obtained in the30-and 15-mm wide combustors at,respectively,1880.27 and 1681.01 m/*** the other hand,the average thrust decreases as the combustor width *** highest thrust is obtained in the 15-mm wide combustor while the lowest is in the 30-mm wide combustor,at 758.06 and 525.93 N,***,the thrust is much more stable in the 25-and 30-mm wide combustors than in the 15-and 20-mm wide combustors.

关键词： Continuous rotating detonation(CRD) Ethylene-air Combustor width Propagation mode Propulsive performance

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Target Information Acquisition Method of Penetration Fuze Based on Composite Detection 10

Target Information Acquisition Method of Penetration Fuze Ba...

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2023 10th International Conference on Advanced Manufacturing technology and Materials Engineering, AMTME 2023

作者： Zhang, Zhenze Sui, Li Yu, Haoyuan Shi, Gengchen Science and Technology on Electromechanical Dynamic Control Laboratory Beijing100081 China School of Mechatronical Engineering Beijing Institute of Technology Beijing100081 China Beijing Institute of Control and Electronic Technology Beijing100038 China

When the traditional high-g acceleration sensor penetrates the hard multi-layered target, it is easy to cause the overlap of the penetration overload. The rigid body signal is submerged in the vibration signal, resulting in the error of the layer-counting recognition algorithm, and it is difficult to judge the time of the penetration ammunition. Based on the principle of the capacitance sensor and the piezoelectric sensor, a composite sensor for penetration fuze is designed in this paper. On this basis, a layer-recognition algorithm based on capacitance and piezoelectric signal fusion is designed, and its feasibility is verified by software simulation. © Published under licence by IOP Publishing Ltd.

关键词： Capacitance

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Characterization of laser power on additive manufacturing of heterostructure parts 4

Characterization of laser power on additive manufacturing of...

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4th International Conference on Defence technology, ICDT 2024

作者： Li, Shiyi Feng, Hengzhen Lv, Sining Kan, Wenxing Science and Technology on Electromechanical Dynamic Control Laboratory School of Mechatronical Engineering Beijing Institute of Technology Beijing China Chongqing Innovation Center Beijing Institute of Technology Chongqing China

In order to meet the demand for low-cost and rapid prototyping of micro-small parts for highly dynamic microsystems, metal additive manufacturing technology has become one of the important means of manufacturing heterogeneous parts. In this paper, the residual stress and deformation generated by the rapid prototyping process of micro-small and complex parts under different laser frequencies are firstly simulated and analyzed, and then in order to check the resistance of the parts to high overload, the densities and hardnesses of the printed parts are experimentally tested. The results show that, on the basis of ensuring that the powder can be fully melted, the lower laser power, the smaller residual stress of the micro-small complex parts, the smaller deformation of the parts caused. The physical energy density also shows a certain correlation to the density and hardness of the specimen, the higher physical energy density, the higher density and hardness of the specimen. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Brinell Hardness

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Earth polar motion parameters high accuracy differential prediction 27

Earth polar motion parameters high accuracy differential pre...

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27th Conference of Spacecraft TT and C technology

作者： Chen, Lue Tang, Geshi Hu, Songjie Chen, Ming Li, Yifei Wang, Mei Sun, Jing Shi, Ming Li, Li National Key Laboratory of Science and Technology on Aerospace Flight Dynamic Beijing100094 China Beijing Aerospace Control Center Beijing100094 China

ISBN: (纸本)9783662446867

This paper proposes a method of Earth polar motion parameters prediction by dual differential least-squares (LS) and autoregressive (AR) model. Firstly, polar motion parameters are processed by dual differential method, the stationarity of polar motion parameters is improved. Then, LS+AR method is utilized to analyze the dual differential polar motion parameters to obtain the preliminary prediction results. Finally, the preliminary prediction results are processed by inverse dual differential method to obtain high accuracy polar motion prediction results. The prediction results are compared with EOP prediction comparison campaign (EOP_PCC) results, it shows that the short-term polar motion parameters prediction error is at the same level of EOP_PCC. The one day prediction accuracy of PMX is at the level of 0.25 mas, PMY is 0.2 mas, they are better than EOP_PCC one day polar motion prediction accuracy. © Tsinghua University Press, Beijing and Springer-Verlag Berlin Heidelberg 2015.

关键词： Forecasting

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Simulation and experimental study of capacitive sensors for penetration fuze 9

Simulation and experimental study of capacitive sensors for ...

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9th International Conference on Energy Materials and Electrical Engineering, ICEMEE 2023

作者： Zou, Qipeng Sui, Li Zhang, Meiyun Shi, Gengchen Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing100081 China Northwest Industries Group Co. Ltd Xi'an710043 China

ISBN: (纸本)9781510672765

More and more important military facilities and command centers have been moved underground or protected with bunkers, so penetration munitions for such targets have become one of the important research directions for military equipment research institutes in various countries. The penetration fuze is a key part to achieve efficient destruction of penetration munitions, but the current high g accelerometers which are widely used in the penetration fuze have problems, such as the output signal mixing with the structural response of the projectile and noise signals, signal sticking and so on. In order to solve these problems, we designed a kind of capacitance sensor for penetration fuze. This paper further designed a signal processing circuit for the sensor, and the simulation and hammering tests were conducted to verify that the capacitive sensor for the penetration fuze can effectively suppress the structural response of the projectile and noise interference, and the signal sticking phenomenon can be reduced under the working condition of the penetration multi-layer target plate. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Sensors Signal processing Capacitance Accelerometers Elasticity Interference (communication) Weapons Reflection Simulations

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Design, Modeling and Motion Simulation of a Setback Arming Mechanism under Weak Acting Forces 4

Design, Modeling and Motion Simulation of a Setback Arming M...

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2021 4th International Conference on Modeling, Simulation and Optimization Technologies and Applications, MSOTA 2021

作者： Lv, Bing Wang, Dongya Zhang, Zhenze Sui, Li Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing100081 China Northwest Industries Group Co. Ltd Xi'an710043 China

A parallel two-degree-of-freedom (two-DOF) setback arming mechanism was designed in this study according to acceleration signal characteristics of weak launch and service conditions. A model of an inertia switch with a low g-feature was designed to be used in the electromechanical fuze of the proposed mechanism. Simulations were conducted to analyze the motion characteristics of the inertia switch that was based on the parallel two-DOF spring-mass system under the launch overload and the service dropping overload. The reliability and safety of the inertia switch were validated. © Published under licence by IOP Publishing Ltd.

关键词： Degrees of freedom (mechanics)

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Near-Field High-Speed Target InISAR Imaging Based on Wavenumber Domain Interpolation

Near-Field High-Speed Target InISAR Imaging Based on Wavenum...

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2022 International Applied Computational Electromagnetics Society Symposium, ACES-China 2022

作者： Chen, Yijiang Wei, Guohua Li, Yuzhao Wang, Xu Chen, Jichi Beijing Institute of Technology School of Information and Electronics Beijing China Beijing Institute of Remote Sensing Equipment Science and Technology on Electromechanical Dynamic Control Laboratory Beijing China

ISBN: (纸本)9781665452366

In this paper, a near-field high-speed target InISAR imaging method based on wavenumber domain interpolation is proposed. The focusing of the ISAR image is accomplished by performing Stolt interpolation on the echo signal in the wavenumber domain. Three-dimensional imaging is achieved by interferometric imaging algorithms. The algorithm simulation is carried out using the scattering point model generated by the electromagnetic simulation software, and the validity and stability of the algorithm are verified. © 2022 IEEE.

关键词： Interpolation

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Monte Carlo-based simulation study on the firing performance of mortar projectiles trigger mechanism

Monte Carlo-based simulation study on the firing performance...

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2022 International Symposium on Robotics, Artificial Intelligence, and Information Engineering, RAIIE 2022

作者： Shi, Mengjie Song, Rongchang Cui, Haibin Li, Hongshe He, Guanglin Du, Yanan Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing China Huaihai Industry Group Co. Ltd. Shanxi Changzhi China

ISBN: (纸本)9781510660137

The mortar projectiles often land on the back of the hillside when fighting in mountainous areas. The projectile hits the target with a small landing angle, and there will be a phenomenon of rubbing the ground, resulting in a low hit rate. In this paper, a multi-rigid-body dynamics virtual prototype model is established for different targets struck by a different falling angle of the mortar projectile, the displacement and velocity data of the firing-pin and detonator as well as the incomplete firing results are obtained through simulation, the firing probability is evaluated by applying the Monte Carlo method, the contribution of the variables affecting the target value is obtained by applying the design of experiment(DOE), and the relevant parameters are optimized to realize fully fire when the parameters are in their new value range. © 2022 SPIE.

关键词： Mortar

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