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Qinxiang Xia,Teng Xu,Guohua Hong,Weiping Ruan 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.5
In this research, a prediction model of the sound pressure level during blanking using servo press with counterforce was establishedbased on the acoustic theory as well as the vibration equation of punch in the course of breakthrough process. The theoretical values ofthe sound pressure level of blanking noise were calculated based on the developed prediction model. The variation of the sound pressurelevel of blanking noise with different parameters was also investigated and compared with the experimental results. It reveals that theblanking noise increases with the shear strength and the thickness of sheet metal, and further the blanking speed. The relative error betweenthe experimental results and the theoretical ones determined based on the prediction model is less than 1.7%, and the applicationexample of the prediction model in batch production is given. The prediction model is thus proved to be promising and efficient for noiseprediction during blanking using servo press with counterforce.
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Mechanical characterization of flat specimens in tensile test and numerical simulation
Saijun Zhang,Qinxiang Xia,Ning Yuan 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.2
Tensile test experiments with flat specimens for SPCC and JAC340H are presented and simulated in this paper. Digital image correlation (DIC) technology is used to measure the deformation during tension procedure, and the accuracy of the home-developed DIC equipment is discussed. The 3-D finite element models of tensile specimens are developed to analyze the influences of different yield functions upon evaluating the engineering stress-engineering strain relationship, load-true strain curve, transversal-longitudinal true strain relationship and the distribution of longitudinal strain after necking. The comparisons between the simulations and the experimental results show that the Barlat 1991 yield function offers better results than the von Mises yield function and Hill 1948 yield function do.
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Research on Lyapunov-based Predictive Path Following Control of AGV Based on Time Constraint
Shaobo Zhang,Qinxiang Xia,Gangfeng Xiao,Sizhu Cheng,Mingxing Chen 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.12
Automated Guided Vehicles (AGV) usually takes on the responsibility of material transmission in industrial applications with a wireless computer-controlled differential driving. A Lyapunov-based model predictive control method is proposed for the AGV path following problem with considering the time constraint. The time constraint problem of path following is introduced for industrial scheduling fields, and the reference path is discretized and virtually constructed by the quadratic programming method based on the double integrator technique. The stabilization point control theorem is migrated to solve the path following control, and adopted to track the generated discretized setting reference path points by using the model predictive control method. The predictive following control method is constrained by the Lyapunov function, which ensures the stability of the control of AGV motion. The controller is constrained by Lyapunov stability criteria to demonstrate the local and global convergence of the control system. The comparative results of numerical simulation experiments show that the proven method is effective with better smoothness and stability.
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Catalytic combustion of volatile aromatic compounds over CuO-CeO2 catalyst
Hongmei Xie,Qinxiang Du,Hui Li,Guilin Zhou,Shengming Chen,Zhaojie Jiao,Jianmin Ren 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.7
Ce1−xCuxO2 oxide solid solution catalysts with different Ce/Cu mole ratios were synthesized by the one-pot complex method. The prepared Ce1−xCuxO2 catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and H2 temperature-programmed reduction (H2-TPR). Their catalytic properties were also investigated by catalytic combustion of phenyl volatile organic compounds (PVOCs: benzene, toluene, xylene, and ethylbenzene) in air. XRD analysis confirmed that the CuO species can fully dissolve into the CeO2 lattice to form CeCu oxide solid solutions. XPS and H2-TPR results indicated that the prepared Ce1−xCuxO2 catalysts contain abundant reactive oxygen species and superior reducibility. Furthermore, the physicochemical properties of the prepared Ce1−xCuxO2 catalysts are affected by the Ce/Cu mole ratio. The CeCu3 catalyst with Ce/Cu mole ratio of 3.0 contains abundant reactive oxygen species and exhibits superior catalytic combustion activity of PVOCs. Moreover, the ignitability of PVOCs is also affected by the respective physicochemical properties. The catalytic combustion conversions of ethylbenzene, xylene, toluene, and benzene are 99%, 98.9%, 94.3%, and 62.8% at 205, 220, 225, and 225 oC, respectively.
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Deformation Behavior of Haynes230 Superalloy during Backward Flow Forming
Xing-kun Wang,Qinxiang Xia,Xiu-quan Cheng 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.1
Flow forming manufacturing technique has a unique advantage in producing thin-walled cylindrical parts, witnessing a growing demand in defense, aerospace and other fields. However, some of mechanisms of flow forming have not been deeply understood yet. Aiming at easily appearing problems of the crack and expanding, a finite element model with implicit code has been developed to simulate backward flow forming process for production of thin-walled superalloy tubular parts. The material displacement and stressstrain field distribution were obtained, impact of material displacement to dimensional accuracy and residual stress of spun part was analyzed; distribution of strain vector along thickness of spun part and its influence on the occurrence of fracture was analyzed. The results indicate that inhomogeneous distribution of material displacement in thickness brings about residual tensile stress in outer layer and residual compressive stress in inner layer of spun part; plastic deformation occurs mainly in the outer layer; shear plastic strain on the outer surface is much larger than the inner, which may lead to fracture on the outer surface. Above research can play an active role in understanding the mechanism of backward flow forming and deepening the understanding of fracture and the optimization of the process parameters.
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