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Nonlinear vibration characteristics of accelerating viscoelastic membrane
Mingyue Shao,Jing Wang,Jimei Wu,Jiajuan Qing,Zhicheng Xue 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.10
Considering the viscoelastic characteristics of the accelerating viscoelastic membrane in roll-to-roll manufacturing, the nonlinear vibration characteristics of the accelerating viscoelastic membrane were investigated. The mechanical model of the accelerating viscoelastic membrane was established. Considering geometric nonlinearity, the equation of nonlinear vibration of the accelerating viscoelastic membrane was deduced. The ordinary differential equation of moving membranes was obtained using the Bubnov-Galerkin method and solved using the method of multiple scales. Numerical analyses reveal the effects of constant average speed, the speed fluctuation amplitude, the elastic modulus, the viscosity coefficient, and other parameters on the amplitude of vibration and the amplitude-frequency characteristics of moving membranes. Results provide theoretical guidance for the reasonable selection of printing parameters.
Bifurcation and chaos of the traveling membrane on oblique supports subjected to external excitation
Mingyue Shao,Jiajuan Qing,Jimei Wu 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.11
This paper analyzes bifurcation and chaos of the traveling membrane on oblique supports subjected to external excitation. Through coordinate transformation, the Von Karman nonlinear plate theory was employed to derive the non-linear governing equations of membrane on oblique supports in terms of axial movement in the oblique coordinate system. The boundary conditions were also given in the oblique coordinate system. The approximate solution for the governing equations was found via the Galerkin method as well as the fourthorder Runge-Kutta numerical computing method. The nonlinear dynamic techniques including Lyapunov exponents diagrams, bifurcation plots, Poincare maps, phase trajectories, and time histories were introduced to analyze the impacts of the angles of oblique supports, aspect ratios and traveling velocities on dynamics responses and the various forms of vibration regarding the membrane system.
The Storage Grain and Environment Modeling Based on TS-PLS
Lan Wu,Yanbo Hui,Mingyue Li 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.1
Food security is a strategic cornerstone of national security, and the food safety storage is a recognized problem. Accurate representation of grain storage environment is a fundamental premise for secure storage, which is very difficult because of the complex linkage relation between stored grain and grain storage environment. The characteristics between grain and environment, such as large time lag, two-way coupling, nonlinear, time-varying, make analysis and modeling face more difficulties and challenges. Based on this, combining PLS and TS fuzzy model, a modeling method of dynamic nonlinear multi-input multi-output (MIMO) system is proposed in this paper, which effectively solves the problem of strong nonlinear and correlation, at the same time reduces the computational complexity of data modeling methods. The simulation results show that this modeling could effectively describe the relationship between storage grain and environment.
A Novel Natural Dye Derivative for Natural Fabric Supercritical Carbon Dioxide Dyeing Technology
Jinsong Wu,Hongjuan Zhao,Mingyue Wang,Weiru Zhi,Xiaoqing Xiong,Laijiu Zheng 한국섬유공학회 2019 Fibers and polymers Vol.20 No.11
The supercritical carbon dioxide (SC-CO2) dyeing technology is a green dyeing technology, and the usage ofnatural dye makes SC-CO2 dyeing technology safer and more environment-friendly. Nevertheless, after using natural dye inSC-CO2 dyeing, the color depth and fastness of dyed natural fabric are poor. In this study, alkyl and hydroxyalkyl groupswere grafted onto alizarin, which is a natural dye, to elevate the color depths and fastness of alizarin-derivative-dyed naturalfabric. The results demonstrate that the color depths of alkyl-alizarin-dyed and hydroxyalkyl-alizarin-dyed natural fabricswere increased. This has to do with the increase in the solubilities of alkyl alizarin and hydroxyalkyl alizarin in SC-CO2. Thehydroxybutyl-alizarin-dyed wool displayed the best color depth (K/S value: 6.44). And the hydroxyalkyl-alizarin-dyednatural fabric showed good washing fastness and rubbing fastness (about 4-5 level), because that hydroxyalkyl alizarin couldbe linked by a covalent bond to the natural fabric.
Li Juanfei,Wu Lei,Ma Mingyu,Song Ruifeng,Dong Chunhui,Wei Junfang,Li Jinsheng,Wang Xiaoqiang,Li Mingya 한국물리학회 2023 Current Applied Physics Vol.46 No.-
La0.7Sr0.3MnO3 (LSMO)/LaNiO3 (LNO) thin films were deposited successively on Si single crystal by the sol-gel method. The bipolar resistive switching (RS) behavior was studied in Al/LSMO/LNO devices. Obvious current hysteresis was observed, the set (reset) voltage and resistance ratio were modulated by the annealing temperature of LSMO thin films. At the annealing temperature of 750 ◦C, good endurance and retention performance were obtained in the memory device. According to the fitting results of I–V curves, based on Schottky emission model, the conduction mechanisms of Al/LSMO/LNO devices were discussed. Our results may give a valuable insight on developing perovskite-type rare earth manganese oxide.
Effect of pH on Types of Acidogenic Fermentation of Fruit and Vegetable Wastes
Mingxia Zheng,Mingyue Zheng,Yuanyuan Wu,Hailing Ma,Kaijun Wang 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.2
The effect of pH (4.0, 5.0, and 6.0) on acidification and fermentation of fruit and vegetable wastes was investigated using batch and semi-continuous experiments under mesophilic condition. Results showed that fermentation types change with pH variation. The pH of acidification system containing fruit and vegetable wastes could automatically decrease to 3.0 ~ 4.0. At this pH range, a stable ethanol production was observed, at which ethanol-type fermentation was obtained. Based on the results, the fermentation types were classified into ethanol-type, mixed acid-type, propionic acid-type, and butyric acid-type fermentations, which occurred at pH 4.0 ~ 4.5, 4.5 ~ 5.0, 5.0 ~ 5.5, and 5.5 ~ 6.5, respectively.
Runfang Hou,Mingyu Wu,Qingyang Li,Wei Li,D. L. Chen,D. Y. Li 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12
Due to its corrosion resistance, modifiable mechanical properties, and electrical conductivity, etc., CuNi alloy has found awide variety of industrial applications, especially in the marine environment. It is highly desired if the mechanical strengthand wear resistance of CuNi alloy can reach a level comparable to that of steel while keeps its corrosion resistance. In thisstudy, effects of Mo, B, and their combinations on microstructure and performance of CuNi alloy were investigated, includingformation of second phases, hardness, and resistances to wear, corrosion and corrosive wear. It was demonstrated thatthe Mo and B additives were effective in strengthening the CuNi alloy while maintaining reasonable corrosion resistance. In particular, the combination of Mo and B additives was more effective than a single additive to strengthen the alloy. Moand B additives have demonstrated their great promise as new alloying elements to modify CuNi alloys.