Ordnance, China
Ordnance, China

Time filter

Source Type

Liu Z.,Beijing Institute of Technology | Chen J.,Beijing Institute of Technology | Yao X.,Ordnance Test Center | Song C.,Beijing Institute of Technology | Wang Y.,Beijing Institute of Technology
Proceedings of the 2010 5th IEEE Conference on Industrial Electronics and Applications, ICIEA 2010 | Year: 2010

In this paper, considering the performance of short- time working, inertial flight and high impulse of launch for projectile, an improved square root unscented Kalman filter (UKF) is used. According to the special motional rule of projectile, only use three low-cost MEMS accelerometers as inertial measurement unit to measure the specific force, and construct the linear state equation and nonlinear measurement equation of nonlinear system. Use the square root UKF to estimate the state of system, which effectively enhances the stability of filter and restrains the divergence of filter. Reduce the number of sigma points from 2n+1 to n+2, which improves the computational efficiency and real-time performance of filter. The experimental results in a three-axis flight test rotary table show that the improved square root UKF obtains the good precision of estimation and satisfies the request of real-time response. © 2010 IEEE.


Deng S.-J.,Ordnance Engineering College | Tang L.-W.,Ordnance Engineering College | Yu G.-B.,Ordnance Engineering College | Yang J.,Ordnance Test Center
QR2MSE 2013 - Proceedings of 2013 International Conference on Quality, Reliability, Risk, Maintenance, and Safety Engineering | Year: 2013

Many characteristics were distilled based on the vibration signal from gear-box Accelerated Life Testing. After analyzing the stability and sensitiveness of these characteristics, the factors, such as Clearance Factor, Crest Factor, Shape Factor and Root Mean Square, were selected and used. Then a residual useful life prediction model of gear-box based on stochastic filtering was established, which provided a recursion formula of the probability density function of residual useful life. A maximum likelihood estimation method was designed, which can estimate the unknown parameters. Finally, the validity and practicability of the model are validated by an example. © 2013 IEEE.


Du Y.-H.,Beijing Institute of Technology | Du Y.-H.,Ordnance Test Center | Yu H.,Ordnance Test Center | Li G.-F.,Ordnance Test Center | Zhao J.,Ordnance Test Center
Dandao Xuebao/Journal of Ballistics | Year: 2013

The test data are not enough to evaluate the reliability of shooting accuracy rate. To solve the problem, a reliability evaluation method of shooting accuracy based on cloud model was introduced. In this method, Bayes theory and cloud model were applied in the research of reliability evaluation of shooting accuracy rate. The distribution of impact points on target was simulated by forward cloud generator, and shooting accuracy was estimated by R50. Shooting accuracy rate and contingent probability were calculated, and then reliability evaluation of shooting accuracy rate was carried out by using Bayes theory. An example was given, and the reliability of shooting accuracy was estimated, and the least number of needed samples was fixed. The results offer reference for further study on the reliability evaluation of shooting accuracy rate.


Yin Z.,Ordnance Engineering College | Yin Z.,CAS Chongqing Institute of Green and Intelligent Technology | Wang Y.,Ordnance Engineering College | Yin S.,CAS Chongqing Institute of Green and Intelligent Technology | And 4 more authors.
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | Year: 2013

In order to achieve high-homogeneity pumping source of semiconductor laser, the influence of microlens changes in the imaging beam integrator on the homogeneity of pumping light is researched. The relation between microlens numerical aperture and the divergence angle of the incident beam is discussed in detail. The far field distribution model of the Gaussian beam passing through the imaging beam integrator is established, in order to analyze the impact of the diffraction of microlens edge on the spot homogeneity. The upper and lower limits of clear aperture of microlens are confirmed to provide a range value for the optical design of the imaging beam integrator. Finally, the software simulation results with ZEMAX and experimental result are compared, showing that the spot of inhomogeneity 8. 11% is achieved by the optimized imaging beam integrator.


Yin Z.,Ordnance Engineering College | Yin Z.,CAS Chongqing Institute of Green and Intelligent Technology | Wang Y.,Ordnance Engineering College | Yin S.,CAS Chongqing Institute of Green and Intelligent Technology | And 4 more authors.
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | Year: 2013

In order to realize the spot homogenization and beam shaping of high-power laser diode stack, a homogenization system is proposed based on double cylindrical lenses in the slow axis direction. The double cylindrical lenses are used to collimate beams of high fill factor laser diodes in the slow axis direction, for decreasing the numerical aperture of microlenses in the imaging multi-aperture integrator and reducing the homogenization system volume. Through three limiting conditions, the parameter ranges of the double cylindrical lenses are determined. By analyzing the effect of aberration on slow axis collimation, the double cylindrical lenses are optimized to achieve the remaining divergence angle of 1.74°. With the imaging multi-aperture beam integrator, the homogenization system for laser diode stack beams is designed and verified through experimental test. The experimental results show that the size of central spot on the target plane is about 6 mm×6 mm and the spot inhomogeneity reaches to 8.11%.


Wang J.,Beijing Institute of Technology | Song C.,Beijing Institute of Technology | Chen J.,Beijing Institute of Technology | Liu Z.,Beijing Institute of Technology | Yao X.,Ordnance Test Center
2010 IEEE International Conference on Information and Automation, ICIA 2010 | Year: 2010

The error model of marine strapdown inertial navigation system on the swaying base is nonlinear, while the azimuth angle is large. For the nonlinear error model, a new recursive Gaussian Particle filter based on randomized Quasi Monte Carlo is proposed. The randomized Quasi Monte Carlo methods use the weighted randomized low discrepancy particles to replace the weighted random samples, in order to avoid the possible gaps and clusters that arise from random sampling in Monte Carlo methods, and improve the sampling efficiency and calculation accuracy. The simulation experiment shows that the new approach obtains the better estimation performance in initial alignment of large azimuth misalignment on the swaying base of the marine strapdown inertial navigation system. ©2010 IEEE.


Wu H.,Ordnance Test Center | Zhang S.,Ordnance Test Center | Liu P.,Ordnance Test Center | Zhang W.,Ordnance Test Center | Wang W.,Ordnance Test Center
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014

The high speed tracing imaging technique based on a scanning reflector, can realize a real-time tracking imaging measurement of the live scene. It can compensate field of view of the fixed high speed camera and scanning velocity of photoelectric theodolites. In this work, a synchronous tracking system realized by a rotating mirror is introduced. The imaging performance is analyzed in detail. The scheme to gain flight characteristics of targets is presented. A certificated test is performed and its results confirmed the feasibility of this system. © 2014 Copyright SPIE.

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