Northwest Industries Group Co.

Fengcheng, China

Northwest Industries Group Co.

Fengcheng, China
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Hu O.,Beijing Institute of Technology | Hu O.,The Aerospace Corporation | Wang J.,Beijing Institute of Technology | Huang P.,Northwest Industries Group Co. | And 2 more authors.
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2017

Disturbance rejection rate (DRR) not only affected output accuracy of the seeker but also worsened the performance of missile guidance system. The main factors which caused the problem of DRR with semi-strapdown imaging seeker were scale error and disturbance torque. Firstly, a model of guidance system which contained disturbance rejection rate parasitic loop (DRRPL) was established. The relationship between DRR caused by different factors and the stabilization of guidance system was analyzed on basis of the model. Then, an online rejection method based on strong tracking unscented kalman filter (STUKF) was proposed to solve the problem above. The nonlinear filter model considering DRRPL was built by working principle of semi-strapdown seeker, the STUKF algorithm was adopted to estimate DRR and real line of sight rate. Finally, a math simulation was put forward. The result indicates that the guidance accuracy is improved after the compensation of DRR, and the compensation method had good anti-interference and robustness. The above theoretical analysis can provide guidance for online identification and compensation of semi-strapdown seeker disturbance rejection rate. © 2017, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.


Wu X.,Beijing Institute of Technology | Mei Y.,Beijing Institute of Technology | Ma Y.,Northwest Industries Group Co. | Chen X.,China North Industries Crop.
Chinese Control Conference, CCC | Year: 2013

Strapdown inertial navigation system based on MEMS was applied more and more widely in engineering, and traditional processors have been increasingly unable to meet the accuracy, real-time requirements. Therefore, to improve the calculation accuracy of strapdown inertial navigation system based on MEMS is one of direction of the scholars research. A MEMS strapdown inertial navigation system based on TMS320C6748DSP, which is TI's latest developed products, was designed in this paper. Four modules were designed in this system: Power management module, the data receiving module, data solver module, data storage and transmission module. Design of the hardware and software about this system and the part of software program also were given. The performance comparative test between C6748 and C2812 were done. Simulation results show that this system based on C6748 has better high-precision, and real-time, and it can meet the performance demand. © 2013 TCCT, CAA.


Chen R.,Xi'an Jiaotong University | Nie Y.,Northwest Industries Group Co. | Zhou Q.,Xi'an University of Architecture and Technology | Gong C.,Xi'an Jiaotong University | Chen T.,Xi'an Jiaotong University
Applied Mechanics and Materials | Year: 2012

A new type of hydrostatic journal gas bearing with axial slot of tangential gas entry for miniature air turboexpander is firstly developed in this paper. This bearing configuration is presented and constructed to fit manufacture simplicity. The experimental investigations are carried out to reveal the relationship between bearing parameters and instability threshold speed. It is feasible to increase the stability of hydrostatic journal gas bearing by adopting this kind of configuration with axial slot of tangential gas entry. Some valuable tested results are obtained to reveal the optimum slot height and radial clearance for this miniature air turboexpander. © (2012) Trans Tech Publications, Switzerland.


He S.,Beijing Institute of Technology | Wang W.,Beijing Institute of Technology | Lin D.,Beijing Institute of Technology | Lei H.,Northwest Industries Group Co.
Proceedings of the Institution of Mechanical Engineers. Part I: Journal of Systems and Control Engineering | Year: 2016

This article documents a new output feedback guidance scheme for autonomous spacecraft rendezvous in the presence of actuator faults. The proposed approach is essentially a compound control methodology, which consists of higher order sliding mode observer and fast nonsingular terminal sliding mode technique. More specifically, the higher order sliding mode observer is used to estimate the relative velocity between two spacecraft while the fast nonsingular terminal sliding mode controller is used to regulate the relative position and the relative velocity to a small region around zero in finite time. The stability and performance of the closed-loop system are also analyzed using finite-time bounded function and Lyapunov function methods. Finally, numerical simulations are performed to demonstrate the robustness and effectiveness of the proposed method. © Institution of Mechanical Engineers.


Xu J.,Beijing Institute of Technology | Wang J.,Beijing Institute of Technology | Song T.,Beijing Institute of Technology | Hu K.-R.,Northwest Industries Group Co.
Binggong Xuebao/Acta Armamentarii | Year: 2014

The disturbance rejection rate (DRR) of seeker has the effect on the output accuracy of seeker and the guidance performance. An online inhibition method based on disturbance observer is proposed for the problems of the guidance precision of missile caused by DRR. The errors of seeker models, the output frequency of detector and the effect of measurement noise on DRR inhibition are presented. The result shows that the spring torque and the damping torque are the main factors of the DRR generation, and the missile guidance precision would be reduced. The online inhibition method based on disturbance observer can inhibit DRR effectively; but the errors of seeker models, the output frequency of the detector and the measurement noise reduce the inhibition effects to some extent. ©, 2014, China Ordnance Society. All right reserved.


Tang J.,PLA University of Science and Technology | Ai F.,Northwest Industries Group CO. | Shao F.,PLA University of Science and Technology | Zhang J.,PLA University of Science and Technology
Xitong Fangzhen Xuebao / Journal of System Simulation | Year: 2016

The disjoint MPs (Minimal Path sets) algorithm proposed was improved from the point of signal transmission. The CoA network was transformed into a corresponding signal network, which was composed of forward and backward transmitting paths. According to the basic principle of disjoint MPs algorithm, a set of signal transmitting and rewriting rules, including forward and backward processing rules, were designed to make the disjoint MPs could be generated by means of DES (Discrete Event Simulation). The basic realizing idea was studied in SimEvents, in which, the entities acted as the information carriers, and the nodes as the message storage and processing units. During the operation of the network model, messages carried by entities will be constantly rewritten and transmitted before all the entities arrived to the terminal node. Until then, all the disjoint MPs could be automatically generated. The simulation results of bridged network and a more complex one verified the correctness of the transmitting rules and the feasibility to realize this algorithm by means of DES. © 2016, The Editorial Board of Journal of System Simulation. All right reserved.


Li W.-B.,Nanjing University of Science and Technology | Fan F.,Nanjing University of Science and Technology | Fan F.,Northwest Industries Group Co. | Wang X.-M.,Nanjing University of Science and Technology | Ding B.,Northwest Industries Group Co.
Binggong Xuebao/Acta Armamentarii | Year: 2013

Summing up the theory analysis, simulation calculation and test study, this paper optimized the dual-mode warhead to achieve the conversion of jetting projectile charge(JPC) and jet (JET). It was analyzed the liner collapse situation under single point detonation and annular detonation by the theory, and optimized the shaped charge parameters, such as liner cone, radian radius, thickness and charge height, by the numerical simulation. Then, it obtained the initiation mode and the matching relations of the shaped charge parameters which could get the conversion between JPC and JET. The JPC was formed by single point detonation, and the JET was formed by annular detonation. The liner cone was chosen 80°~100°, the liner radian radius was 0.1 time charge caliber, the liner thickness was designed in accordance with liner cone, and the charge height is 0.9 time charge caliber. Aimed at the optimal structure, the X-ray imaging test was done, and the error between the test and simulation results is within 8%.


Zou H.-J.,Nanjing University of Science and Technology | Chen H.-J.,Nanjing University of Science and Technology | Liang Y.,Nanjing University of Science and Technology | Jiang Q.,Northwest Industries Group Co. | And 2 more authors.
Binggong Xuebao/Acta Armamentarii | Year: 2015

In order to satisfy the drive performance of fuze piezoelectric generator and solve the key problem of excitation energy, an annular nozzle-resonator structure is proposed. CFD method is applied to simulate aerodynamically driven acoustic vibration induced by jet in the resonator. And also, the experiment testing response voltage of piezoelectric transducer is compared with the simulating sound pressure at the bottom of resonator. The results show that the curves of sound pressure and axial velocity varying with time are both similar to sine wave, and their phase difference is approximate 90°, which indicates that a standing wave acoustic field is established inside the resonator. Amplitude and frequency of the simulating sound pressure at the bottom of resonator are much stable and have large amplitude. The frequency of the response voltage is close to that of the simulating sound pressure, which verifies that the jet generator source can produce very stable pure tone. Therefore, the designed jet generator sound source, according to the principle of air flow induced vibration, has non moving components, which is beneficial to improve excitation energy of fuze piezoelectric generator. ©, 2015, China Ordnance Society. All right reserved.


Tao L.-Y.,Hangzhou Dianzi University | Wang Z.-F.,Hangzhou Dianzi University | Nie Q.,Hangzhou Dianzi University | Liang M.-T.,Northwest Industries Group Co.
Jisuanji Jicheng Zhizao Xitong/Computer Integrated Manufacturing Systems, CIMS | Year: 2014

To integrate human factors into the process of unit facilities layout, Rapid Entire Body Assessment (REBA) was introduced to quantitatively analyze the human Occupational Musculoskeletal Injury (OMI) risk in Manual Material Handling (MMH)work. An optimization model of unit facilities layout integrating human factors was proposed by combining the human factors with logistic factors. Furthermore, the simplified particle swarm optimization algorithm was adopted to solve the model and improve its optimization efficiency and accuracy. By taking the numerical control machining unit of a military enterprise as a case, the model was used to design and optimize the current unit facilities layout and the scheme was simulated with ergonomic modules of Delmia. The result showed that by taking human factors into account in the course of designing the facility layout could not only improve the overall efficiency of the manufacturing system, but also reduce workers' OMI risk in MMH, which was conducive to achieve the interconnection between human and manufacturing resources and the humanization of manufacturing process. ©, 2014, CIMS. All right reserved.


Tao L.-Y.,Hangzhou Dianzi University | Nie Q.,Hangzhou Dianzi University | Wang Z.-F.,Hangzhou Dianzi University | Liang M.-T.,Northwest Industries Group Corporation
Jisuanji Jicheng Zhizao Xitong/Computer Integrated Manufacturing Systems, CIMS | Year: 2014

To realize the manufacturing resources optimization under the characteristics of scalable batch production, an effective method to construct manufacturing cells was proposed. In the process of constructing manufacturing cell model, the strategy to analyze the usability of existing cell layout was proposed, and the adaptability of the existing cells layout to the variable-volume production was considered. Aiming at the usability of cells layout and the minimum of material handling cost, the models of objective function and constraint condition were constructed and the problems of device clusters and cell layout were integrated considered. An improved Particle Swarm Optimization (PSO) was used to solve the problems above. Otherwise, particle with two-dimensional real was encoded to solve the discrete space optimization problems with PSO. The effectiveness of proposed method was verified through an instance. ©, 2014, Editorial Department of CIMS. All right reserved.

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