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Feng Z.-Y.,Hubei University of Automotive Technology | Feng Z.-Y.,Hubei Collaborative Innovation Center for Automotive Components Technology | Xu L.,Akita Prefectural University | Liu Z.-T.,Wuhan University | Li D.-Y.,Wuhan University
Chinese Control Conference, CCC | Year: 2015

Optimizing the coordinate transformation matrix is a newly proposed iterative LMI-based approach for solving the H∞ static-output-feedback (SOF) control of discrete-time systems. Once a proper initial coordinate transformation matrix was found, a locally optimal solution for the H∞ SOF control problem can be ensured. However, the problem of how to choose the initial matrix needs to be further studied. This paper applies a cone complementarity linearization (CCL) strategy to solve this problem. Then, a hybrid optimization approach is developed to solve the H∞ SOF control problem. Finally, numerical examples are provided to demonstrate the effectiveness and advantages of the proposed method. © 2015 Technical Committee on Control Theory, Chinese Association of Automation. Source

Ji M.,Hubei University of Automotive Technology | Guo X.,Hubei Collaborative Innovation Center for Automotive Components Technology
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2015

Because of the existence of nonlinear friction in the screw-nut mechanism and planetary gear mechanism, a method had been proposed to describe the friction feature based on the LuGre dynamic friction model. Concerning the position change of the mechanism, asymmetrical surface roughness and the influence of environmental temperature variation, the parameters in friction model may change as well. To improve such phenomenon, it designed an adaptive friction compensation controller and used the Stability Theory of Lyapunov to prove the global stability of the system. Finally, the effectiveness of this method had been verified by the simulation of the electrical parking brake system. ©, 2015, Wuhan University of Technology. All right reserved. Source

Qin X.,Hubei Key Laboratory of Advanced Technology of Automotive Parts | Qin X.,Hubei Collaborative Innovation Center for Automotive Components Technology | Wang Y.,Hubei Key Laboratory of Advanced Technology of Automotive Parts | Wang Y.,Wuhan University of Technology | And 6 more authors.
Materials and Design | Year: 2016

In this paper, the structural acoustics analysis and optimization of an enclosed box-damped structure are investigated by using the response surface methodology (RSM). Acoustic frequency response function analysis, i.e. a unit harmonic force imposing on structure and calculating the sound pressure in cavity, is applied to achieve the critical frequency. The acoustic sensitivity analysis of sound pressure level with respect to the thicknesses of damping layer panels are employed to identify the significant variables. With the help of faced central composite design, an efficient set of sample points are generated, and then the second order polynomial function of the sound pressure response at critical frequency is computed and verified by the adjusted coefficient of multiple determination. After the response surface function is verified, the effect of the thicknesses of damping layer panels on sound pressure is analyzed quantitatively, and the thicknesses of damping layer panels are further optimized to minimize the sound pressure response of the target node. The results indicate that, by using the RSM, the computational time for structural acoustic is saved and the optimization process is simple. The sound pressure of the target node is controlled effectively with less damping material used. © 2016 Elsevier Ltd. Source

Liu Y.,Hubei University of Automotive Technology | Liu Y.,Hubei Collaborative Innovation Center for Automotive Components Technology | Bi J.,Hubei University of Automotive Technology | Bi J.,Hubei Collaborative Innovation Center for Automotive Components Technology | And 3 more authors.
International Journal of Hydrogen Energy | Year: 2016

The effects of palladium introduction on the catalytic activity of LSCF composite cathodes are investigated by comparing the performance of LSCF-GDC and Pd-LSCF-GDC cathodes. Pd-LSCF-GDC cathodes were prepared by impregnation of Pd and LSCF precursor into GDC scaffold separately in two steps. The electrochemical results show that the introduction of Pd promotes the catalytic activity of LSCF-GDC cathodes under the condition of both heating and cooling processes. The promotion is related to the existing state of Pd with LSCF under different conditions. According to in-situ high temperature XRD and XPS results, the PdO phase is stable at temperature below 700 °C, and decomposed to Pd metal at 700-800 °C during heating process. Combination XRD with TG-DSC analysis confirms that some Pd changes into PdO phase at 837 °C. Correspondingly, the phase composition changed little and the coexistence of Pd and tiny PdO is stable in the cooling process from 850 to 25 °C. Copyright © 2016 Hydrogen Energy Publications, LLC. Source

Wang B.,Hubei University of Automotive Technology | Wang B.,Wuhan University of Technology | Hua L.,Hubei University of Automotive Technology | Hua L.,Hubei Collaborative Innovation Center for Automotive Components Technology | And 4 more authors.
International Journal of Advanced Manufacturing Technology | Year: 2016

Multi-pulse tempering (MPT) on the resistance spot welding (RSW) is a considerable method to improve the quality of spot weld joints. For its uncertain tempering temperature and large temperature fluctuation, some stable sequential coupling finite element (FE) models for RSW and MPT of DP590 dual phase steel are developed to control the tempering temperature and further determine the experimental parameters. The nugget shape and size of simulation are verified by experimental observation, and the effects of MPT on microstructure, microhardness, and mechanical property during tensile-shear loading condition are experimentally investigated. The results show that MPT and its tempering temperature have no effect on the tensile-shear failure mode and have slight impact on nugget size and tensile-shear peak load. Besides, MPT leads to lower nugget hardness and better mechanical properties of spot weld joints than that of ordinary RSW due to the formation of a tempered martensite, and the higher tempering temperature expands these effects of MPT. However, the extent of the impact by MPT temperature on microstructure and mechanical property of spot weld joints is inferior to that of the impact by the MPT process itself. © 2016 Springer-Verlag London Source

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