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Yunpeng Sun,Yipeng Lan,Xiaolei Shi,Zelai Xu,Cheng Lei 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.11
In the high-speed and high-precision magnetic suspension linear synchronous motor, the non-linear coupling between armature current, suspension height and horizontal velocity, as well as the uncertain factors such as load disturbance, which will have many adverse effects on the control system. To solve these problems, this paper uses a feedbacklinearized control method. Through coordinate transformation and state feedback, the nonlinear model of motor affine is decoupled and linearized into three independent linear subsystems of straight axis current subsystem, horizontal speed subsystem and suspension height subsystem. In order to reduce the dependence of feedback linearization control on linear motor mathematical model and improve the robustness of servo system, so as to realize decoupling control of magnetic suspension linear synchronous motor, a variable speed reaching law sliding mode controller is designed on the basis of linearization model. Simulation and experimental results show that the dynamic and static performance of the system is enhanced significantly by using the proposed control strategy.
Gasoline Desulfurization by Catalytic Alkylation over Methanesulfonic Acid
Xiaolin Wu,Yunpeng Bai,Ying Tian,Xuan Meng,Li Shi 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.10
Methanesulfonic acid (MSA) was used as catalyst to remove trace organic sulfur (thiophene) from Fluid Catalytic Cracking gasoline (FCC) via alkylation with olefins. The reactions were conducted in Erlenmeyer flask equipped with a water-bath under atmospheric pressure. The influence of the temperature, the reaction time, and the mass ration of MSA were investigated. After a 60 min reaction time at 343 K, the thiophene conversion of 98.7% was obtained with a mass ration of MSA to oil of 10%. The catalyst was reused without a reactivation treatment, and the thiophene conversion reached 92.9% at the third time. The method represents an environmentally benign route to desulfur, because MSA could easily be separated from the reaction mixture via decantation and it could be reused.
Gasoline Desulfurization by Catalytic Alkylation over Methanesulfonic Acid
Wu, Xiaolin,Bai, Yunpeng,Tian, Ying,Meng, Xuan,Shi, Li Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.10
Methanesulfonic acid (MSA) was used as catalyst to remove trace organic sulfur (thiophene) from Fluid Catalytic Cracking gasoline (FCC) via alkylation with olefins. The reactions were conducted in Erlenmeyer flask equipped with a water-bath under atmospheric pressure. The influence of the temperature, the reaction time, and the mass ration of MSA were investigated. After a 60 min reaction time at 343 K, the thiophene conversion of 98.7% was obtained with a mass ration of MSA to oil of 10%. The catalyst was reused without a reactivation treatment, and the thiophene conversion reached 92.9% at the third time. The method represents an environmentally benign route to desulfur, because MSA could easily be separated from the reaction mixture via decantation and it could be reused.