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Wang X.,Northeastern University China | Zhang P.,Shenyang SIASUN Robot and Automation Co. | Wang J.,Northeastern University China
2013 25th Chinese Control and Decision Conference, CCDC 2013 | Year: 2013

Switching control is a basic anti-surge control strategy for compressor, according to the problem that the switching point is mainly chosen by human experience, this paper presents a method that can determine the anti-surge point automatically. This paper uses the Generalized Minimum Variance (GMV) benchmark to assess the performance of control systems, by monitoring the performance changes of anti-surge control system, and according to the relationship of anti-surge technological requirements and the control performance index, it can automatically calculate the switching point of anti-suge control. The simulation results show that the method has effective and practical characters. © 2013 IEEE. Source

Liu G.-L.,Shenyang University of Technology | Zhang G.-Y.,Shenyang Normal University | Bao J.-S.,Shenyang SIASUN Robot and Automation Co. | Zhang H.,Shenyang Normal University
Wuli Xuebao/Acta Physica Sinica | Year: 2014

The synergistic catalytic mechanism of anion, cation ions in TiF3, TiCl3 catalysts for LiBH4 has been studied by first-principles method based on density functional theory. According to the results, Ti metal doping in LiBH4 is not easy realized with respect to halogen elements. Co-doping with transition metal and elements in halogen family is achieved easier than doping with Ti alone. For TiF3 catalyst, to achieve doping with one kind of element is helpful to doping with another kind of element, which accordingly results in the increase of doping concentration. Based on the analysis of the electronic structure, we find that doping with halogen element alone can reduce the stability of LiBH4; while doping with Ti alone leads to the rise of Fermi level; the introduction of defect energy level and the weakening of B-H bond; these may be responsible for improving greatly the desorption kinetics of LiBH4 by titanium halide catalysts. The improvement of the dehydrogenating kinetics of LiBH4 with titanium halide catalyst additives is mainly due to the B-H bond weakening, which makes H atom diffuse easily. For TiF3, TiCl3 catalysts, in the reversible desorption process of LiBH4, F and Ti have synergistic action for the B-H bond weakening, but the synergistic action of Cl and Ti is not obvious, this may be the reason for the advantage of TiF3 over TiCl3 in LiBH4 catalytic reaction. ©, 2014, Chinese Physical Society. Source

Sun S.,Shenyang University of Technology | Yao H.,Shenyang SIASUN Robot and Automation Co. | Wang M.,Shenyang University of Technology
Applied Mechanics and Materials | Year: 2013

A mechanical component may fail in many modes that are usually not independent. There is generally not a joint probability density function to describe these correlated failure modes. Thus, it is difficult to compute the reliability with considering the correlations between the failure modes. It is supposed that three or more failure modes arise synchronously to be a very small probability event. The relationship between ultimate state functions in different failure modes is established by utilizing linear regression method. A double integration modal for reliability of mechanical components with dependent failure modes is built according to stress-strength interference model. In case of square, cube or exponential relationship between two ultimate state functions, a linear transformation is made. An example of pin is discussed. Its reliability is compared with that obtained using Monte Carlo method, which represent that the reliability model with multi-failure modes proposed is correct. © (2013) Trans Tech Publications, Switzerland. Source

Xu G.,Shenyang University of Technology | Zhong L.,Shenyang University of Technology | Hang Z.,Shenyang University of Technology | Li T.,Shenyang University of Technology | And 3 more authors.
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2013

The narrow-gap solid fiber laser welding with filling hot wire replaces the previous narrow gap tungsten inert gas (TIG) welding. The thickness of the welding is 20 mm and the material is SUS304 austenitic stainless steel. Preliminary study shows that the groove form and the welding process parameters are suitable for narrow gap laser welding with filling hot wire. The causes of blowhole and crystallization crack in the weld metal are analyzed through experiments and the process parameters are adjusted. Under the optimum process parameters, smaller heat affected zone, better surface formability are obtained, and there is no welding defects in the welded joints. The weld metal is fine austenite columnar crystals, which forms a good connection with the base material. Welding deformation is small enough to satisfy the requirement. The weld metal is slightly micro harder than the base metal. The tensile and bending properties meet the test requirements, obtaining good mechanical properties of the welded joints. Source

Wu B.,University of Chinese Academy of Sciences | Qu D.,University of Chinese Academy of Sciences | Xu F.,University of Chinese Academy of Sciences | Song J.,Shenyang SIASUN Robot and Automation Co. | Hu J.,Shenyang SIASUN Robot and Automation Co.
Proceedings of the World Congress on Intelligent Control and Automation (WCICA) | Year: 2015

For industrial robot force signal measurement, we proposed a multi-parameter overall identification method, the results of identification used to compensate six-axis force/torque sensor sampling data, can greatly improve the measurement accuracy of contact force between robot end-effector and the environment. The parameters need to be identified comprise a deflection angle between the sensor coordinate system and the robot sixth axis coordinate system, the gravity of end-effector, the center of gravity of robot end-effector, the zero drift of sensor, a total of 11 parameters. The core idea of the parameters identification is that, firstly, building a parameter identification model about the parameters need to be identified, the robot posture, and the force measured by the sensor; Then, restructuring the parameters as unknown vector; Finally, using the least squares method to calculate the unknown vector which is the result of parameters. This method has two advantages: first, it overall consider a variety of factors, improve the measurement accuracy of the contact force; Second, it can overall identify all parameters, improve the identification efficiency. The theoretical analysis and experimental verification proved the correctness and validity of the method. © 2014 IEEE. Source

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