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Tian L.,Nanjing University of Science and Technology | Qian L.,Nanjing University of Science and Technology | Chen L.,Nanjing University of Science and Technology | Zhang W.,Qiqihar North Machinery Corporation Ltd
2015 IEEE International Conference on Information and Automation, ICIA 2015 - In conjunction with 2015 IEEE International Conference on Automation and Logistics | Year: 2015

This paper presents a sliding mode control method to track desired position for an electro-hydraulic single-rod actuator of a projectile transfer arm. Sliding mode control is used to compensate the nonlinearity and parameters uncertainty of electro-hydraulic system and its control output is the load pressure. A backstepping method is applied to achieve control law of practical electro-hydraulic system and its stability of the closed loop system is proved using the Lyapunov theory. The simulation results show that sliding mode control algorithm puts up better performances for reaching the desired position with required tracking accuracy and rapidity. © 2015 IEEE. Source


Zou Q.,Nanjing University of Science and Technology | Qian L.-F.,Nanjing University of Science and Technology | Xu Y.-D.,Nanjing University of Science and Technology | Jiang Q.-S.,Nanjing University of Science and Technology | Liu Y.-H.,Qiqihar North Machinery Corporation Ltd
Binggong Xuebao/Acta Armamentarii | Year: 2014

An adaptive robust control scheme with integral sliding surface is proposed for the precision position control of the rotational chain shell magazine. The integral operation sliding surface is embedded into the traditional adaptive robust control, and the steady state position tracking error is reduced. Constant robust feedback gain is replaced by nonlinear robust feedback gain, and the transient performance is improved. Mathematical analysis shows that the proposed control scheme can achieve better transient performance and has smaller steady state position tracking error. Simulation results in three conditions (empty-loading, half-loading and full-loading) show that the proposed control scheme is insensitive to parameter variations and external disturbance. Compared with the traditional adaptive robust control scheme, the proposed control scheme has higher position precision and better control performance. ©, 2014, China Ordnance Society. All right reserved. Source


Ding W.,Harbin Institute of Technology | Wu G.-X.,Qiqihar North Machinery Corporation Ltd | Sun X.-H.,Qiqihar North Machinery Corporation Ltd | Xiu Z.-Y.,Harbin Institute of Technology | And 3 more authors.
Cailiao Kexue yu Gongyi/Material Science and Technology | Year: 2011

With more frequent space launch activities, the rapid increase in the number of space debris on future space vehicles pose a threat to security. In order to research the materials of space debris, Tif/Al composite, Tif/Cf/Al composite and Cf/Al composite were fabricated by pressure infiltration technique. These materials were impacted by aluminum projectiles of different diameters from 0.8mm~2.0mm at the speed of 2.5 km/s. It can be judged from the critical diameter of the projectile staving in the material that Tif/Al composite is the best, and then the results of 5A06 aluminum alloy, Tif/Cf/Al composite materials, Cf/Al composite dropped. Measure and compare the various materials between the projectile diameter and pit depth discovery, Cf/Al composite materials, Tif/Cf/Al composite materials, Tif/Al composite materials, 5A06 aluminum projectile diameter and pit depth ratio reduced in turn. Source


Liu Y.,Harbin Institute of Technology | Sun X.-L.,Qiqihar North Machinery Corporation Ltd | Wu G.-X.,Qiqihar North Machinery Corporation Ltd | Jiang D.-M.,Harbin Institute of Technology | Wu G.-H.,Harbin Institute of Technology
Cailiao Kexue yu Gongyi/Material Science and Technology | Year: 2011

This paper researched the microstructure and mechanical property of B 4Cp/AZ91 by using metallurgical microscope, scanning electron microscope (SEM), Transmission Electron Microscope(TEM), sclerometer and Material Testing Machine. B 4C p/AZ91 composites in 50% and 55% volume fraction of reinforcements were prepared by pressure infiltration, and the particle sizes of the reinforcements were 4.5 μm and 17.5 μm respectively. The microstructure observation indicates that the composites has a compact structure and the B 4C particles are evenly distributed in the matrix; MgB 2was found on the interface of B 4C/Mg and dislocations was found between particles by TEM. The analysis on mechanical properties of B 4C/Mg composites indicates that the main factors of mechanical properties are interfacial area per unit volume I c, and it is not beneficial to enhance mechanical properties of the composites if I c is excess or insufficient. Source

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