Unit 63961 of PLA

Beijing, China

Unit 63961 of PLA

Beijing, China
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Lu J.,Northwestern Polytechnical University | Wang Z.,Unit 63961 of PLA | Zhu J.,Northwestern Polytechnical University
Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University | Year: 2017

For motion detection in temporal-spatial domain, a space-time multiscale based moving object detection method was proposed, which can carry out the multiscale in spatial and temporal respectively for motion detection. We achieve multiscale in spatial by using salience detection, and use multiscale Interval-Frame Space (IFS) to deal with the motion salience regions for the end of multiscale in temporal. This method was implemented in space multiscale which reflected the significance of movement, and also in time multiscale which reflected the difference among multiscale frames in the significant region of movement. At last, experimental results show that the proposed method can reduce false alarm and false detection probability. Meanwhile, the method has strong adaptation and robustness. © 2017, Editorial Board of Journal of Northwestern Polytechnical University. All right reserved.

Yu X.-F.,Unit 63961 of PLA | Zhou Q.,Xi'an Modern Chemistry Research Institute | Wang B.-Z.,Xi'an Modern Chemistry Research Institute
Huozhayao Xuebao/Chinese Journal of Explosives and Propellants | Year: 2017

The by-product 1-amino -3,5-diethoxy -2,4,6- trinitrobenzene(AETB)in the amination wastewater of TATB prepared with m-trihydroxybenzene method was qualitatively identified by IR spectroscopy, liquid chromatography-mass spectrometry and high resolution mass spectroscopy. A HPLC method was established for the quantitative determination of AETB. The optimum experimental conditions were determined and the external standard method was used to test the method. The results show that chromatographic conditions are determined as: C18 column (250mm × 4.6mm,5μm), mobile phase of acetonitrile/ water with volume ratio of 85∶15, detection wavelength 224nm and injection quantity 10μL. A linear relationship was presented between the peak area and the content of AETB by external standard method,and the linear correlation coefficient is 0.9998. This method has the advantages of simple operation and without pretreatment of the samples, and experimental result is accurate and reasonable, which can be used to detect residue quantity of AETB in the wastewater of TATB. © 2017, Editorial Board of Journal of Explosives & Propellants. All right reserved.

Yang X.-H.,Nanjing University of Science and Technology | Han J.-L.,Unit 63961 of PLA | Li W.-B.,Nanjing University of Science and Technology
Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology | Year: 2015

A design method was studied to optimize the standoff of shaped charge warhead. By experiment, the static state penetration depth of bi-conical liner shaped charge under 6.0, 6.5, 7.0, 7.5 and 8.0 times standoff and 34° and 40° cone angle were obtained. At the same time, a numerical simulation method was researched and verified on the same experiment conditions. Under different top cone angle, the change rule of the penetration depth with the change of standoff was obtained by numerical simulation. A calculation formula including the variables of cone angle and standoff for static state penetration depth of bi-conical liner shaped charge warhead was obtained. The three-dimensional surface was obtained, which indicated that the static state penetration depth varies with cone angle and standoff. Based these, the optimum standoff of bi-conical liner shaped charge warhead was obtained. The result of experiment and numerical simulation and the design method of standoff distance of bi-conical liner shaped charge warhead can provide reference for related research. ©, 2015, Beijing Institute of Technology. All right reserved.

Wang Z.-X.,Unit 63961 of PLA | Chen L.,Unit 63961 of PLA
Binggong Xuebao/Acta Armamentarii | Year: 2011

In the distributed fire control system, a traditional shooting mode is to shoot at the same time. When the interval between fire units becomes larger, it can not work well under the limit of space baseline, effective shooting height and distance of the fire units. Keeping this mode, two novel shooting modes, i. e. shooting on the same range and shooting the same coming point, are designed. The former can insure that the fire units shoot on their best distances, and the later can insure that the fire units hit the same point. Considering practical applications, the implementations of these shooting modes are presented, and their rationality and feasibility are illustrated by using numerical simulation and range test of a certain type of distributed fire control system.

Xu Y.-X.,Beijing Institute of Technology | Yang X.-H.,Unit 63961 of PLA | Zhang Z.-W.,Beijing Institute of Technology | Wang S.-S.,Beijing Institute of Technology
Binggong Xuebao/Acta Armamentarii | Year: 2012

The law of ignition/initiation of anti-tank shaped charge warhead impacted by fragments was researched. The response characteristics of cylindrical charge and the relation between mass and velocity of fragment which causes the rapid reaction of charge were obtained by the impact of fragment on the cylindrical charge with thin aluminum shell. The ignition/initiation criterion of fragment against anti-tank shape charge warhead was obtained by analyzing the experimental results. The research results can provide the technical support for the design of active protection of tank and armored vehicle, and the research method can provide reference for correlative research.

Lv C.,Beijing Institute of Technology | Song R.-C.,Beijing Institute of Technology | Wang J.-B.,Unit 63961 of PLA | Liu J.-J.,Unit 61741 of PLA | He G.-L.,Beijing Institute of Technology
Binggong Xuebao/Acta Armamentarii | Year: 2012

Using simulation test method to evaluate the performance of fuze is very helpful to reduce the cost of fuze and also speeds up the fuze research and development. Equivalence of simulation test method and real artillery launch test is a criterion to decide whether the test results are reliable. Fuze inertia arming device is taken as an example. Firstly, an equivalence criterion was proposed according to its working principle. Secondly, a mathematical model of fuze inertia arming device was established. Thirdly, a software simulation of the dynamic response of fuze inertia arming device in a series of simulated artillery launch environments and the real artillery launch environment were accomplished. At last, the simulation data analysis proved the feasibility of equivalence.

Wang Y.-Z.,Nanjing University of Science and Technology | Huang Z.-X.,Nanjing University of Science and Technology | Zu X.-D.,Nanjing University of Science and Technology | Xiao Q.-Q.,Nanjing University of Science and Technology | Liu Y.-Y.,Unit 63961 of PLA
Dandao Xuebao/Journal of Ballistics | Year: 2014

The method of coupling effect of circuit and dynamic process was applied as well as the variation principle of mutual inductance between flying plate and transmitter coil in the process of the electromagnetic launch, and the launch process of electromagnetic flying plate (EFP) was theoretically analyzed. The motion model of EFP in the launch phase was established by using the electromagnetic energy-conversion, Newton's law and virtual placement principle. The launch law of EFP motion characteristics was studied. The launch process of EFP was studied by experiment, and the accuracy of the theoretic model was verified. The results show that the speed of the flying plate can be improved effectively by reducing the inductance in the loop and improving the mutual inductance.

Chen L.,Unit 63961 of PLA | Wang Z.-X.,Unit 63961 of PLA
Binggong Xuebao/Acta Armamentarii | Year: 2011

For mining the redundant angle information in optic-electric tracking systems composed of laser range finder and precision angle measurement device under intermittent observations, a federal filter was designed on the basis of the posterior confidence residual test algorithm. Firstly, the position detection channel in traditional optic-electric tracking system was decomposed into two independent detection channels according to physical structure. Then, the target motion states were estimated by use of the detection data of two channels respectively, and a global state estimate was obtained by fusing these two state estimates. Finally, the information sharing of the federal filter was done according to the global state estimate and the posterior confidence of detection channels. Monte Carlo simulation and measurement data show that the proposed filter can obviously improve the estimation performance of optic-electric tracking systems by mining redundant angle information without increasing any hardware cost, and its root mean square of estimate error (RMSE) is close to the average Cramer Rao low bound (CRLB) of tracking systems.

Chen L.-X.,Unit 63961 of PLA | Wu W.-L.,Unit 63961 of PLA
Xi Tong Gong Cheng Yu Dian Zi Ji Shu/Systems Engineering and Electronics | Year: 2013

Firstly, considering efficiency evaluation of the land-based platforms launching unguided munitions to damage time sensitive targets (TSTs), based on the tradition theory of damage efficiency evaluation, the efficiency evaluating model of unguided munitions damaging unmoving group targets on land is developed. Secondly, based on the probability of target being present, the efficiency evaluating model of unguided munitions damaging TSTs on land is provided. Thirdly, based on analysis of the influence of target moving on damaging efficiency, the efficiency evaluating model of unguided munitions damaging TCTs on land is established. Finally, theoretical analysis and numerical simulation results show validity of the model and the laws of damaging efficiency changing with firing duration, target dwell time and target moving speed are studied.

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