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- 저자 : Yuze Ma (검색결과 2 건)
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Adaptive robust target tracking control of marching tank under high-speed maneuvering condition
Cong Li,Guolai Yang,Xiuye Wang,Yuze Ma,Liqun Wang,Quanzhao Sun 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.6
This paper focuses on the problem of target tracking control of marching tanks under the condition of high-speed maneuver based on sliding mode disturbance observer. First, the dynamic model of marching tank is established by using multi-body dynamics software. The nonlinear factors such as barrel flexibility, clearance between barrel and bushing, and uncertainty sources such as road excitation are considered. Second, the mechatronics model of tank bidirectional stabilization system considering transmission clearance and friction is established in numerical simulation software. Aiming at the tank bidirectional stabilization system, an adaptive robust controller based on sliding mode disturbance observer is designed. Finally, the real-time control and target tracking of the tank bidirectional stabilization system are realized by co-simulation. The results show that the sliding mode disturbance observer improves the stability accuracy of the system by 43.22 %. Comparing the simulation results with the PID control, the controller designed in this paper has the characteristics of rapid tracking speed and high robustness, and the advantage is more obvious under the condition of highspeed maneuver.
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Preparation and Hydrogen Barrier Property of FexAly/Al/Al2O3 Composite Coating on X80 Steel Surface
Bingying Wang,Xiaoyong Sun,Enyang Liu,Lin Liu,Wenjuan Ma,Yuze Shi,Peng Huang,Yun Luo 대한금속·재료학회 2024 METALS AND MATERIALS International Vol.30 No.1
Hydrogen-induced embrittlement is a significant safety concern for steel pipelines used in the transmission of hydrogenblendednatural gas. To mitigate this issue, hydrogen barrier coatings can be applied to the surface of steel substrates toreduce hydrogen permeation. In this study, rare earth oxides were optimized via first-principles calculations to identify themost effective doping agents. Subsequently, a FexAly/Al/Al2O3 composite coating doped with La2O3and Ce2O3was successfullyapplied to the surface of X80 steel using hot-dip aluminum plating combined with anodic oxidation. The coatingwas characterized using various techniques, including SEM, EDS, XRD, XPS, and hydrogen permeation tests. The resultsdemonstrated that co-doping La2O3and Ce2O3resulted in a lower adsorption energy of Al2O3to hydrogen molecules, andimproved the surface quality of the aluminizing layer and the composite coating. Electrochemical hydrogen permeationtests showed that the FexAly/Al/Al2O3 composite coating significantly improved the hydrogen barrier property of X80 steel. The anodizing current density was found to have a significant effect on the coating's morphology, which in turn affected thehydrogen barrier property of the coating. The composite coating obtained at an anodizing current density of 2 A/dm2 wasuniform and dense, without noticeable defects, and exhibited the best hydrogen barrier property.
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