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RISS 인기검색어
- 검색키워드
- 저자 : Sheng-Dun Zhao (검색결과 5 건)
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Design and analysis of a novel double-servo direct drive rotary valve with high frequency
Muzhi Zhu,Sheng-Dun Zhao,Peng Dong,Jingxiang Li 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.9
The high frequency double-servo direct drive rotary valve (DDRV) stated in this paper put forward a new kind of drive method and novel structure satisfied highly adjusting reversal frequency and adequate flow as well. The basic structure and working principle of the new type valve were explained at first. Theoretical analysis and calculation of the DDRV were conduct to study the mathematical model on fluid force and torque. A high linear correlation of flow rate and opening of valve port was achieved, and the hydraulic simulation based on AMESim is carried out as evaluation and validation for the theoretical calculation. In addition, the preliminary experiment laid emphasis on the reversing function of DDRV at different working frequency like 80 Hz and 200 Hz and both the simulated and experimental results show a relatively satisfying performance.
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High-accuracy servo press system for the clinching joint process
Chen Liu,Sheng-Dun Zhao,Xiaolan Han,Tong Guo 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.2
This paper focuses on the quality improvements on clinching joints using a servo press with a Radial basis function neural network and a sliding mode (RBFS) control strategy. Bottom thickness, which is affected by the press punch position, is usually used to monitor clinching joint quality. Traditional clinching presses are driven by pneumatic pistons or motors that provide feedback on punch force or motor position. However, this feedback is indirectly related to the joint bottom thickness. Clinching workers who set the control parameters on these presses depend on tests and statistics. Thus, this paper presents a servo press system that utilizes punch position feedback to directly control the joint bottom thickness. Transmission errors are considered for the movement accuracy of the servo press. A mathematical model of the servo press is established for analyzing. An algorithm, which combines RBF neural network and sliding mode, is proposed and applied for press position tracking. This algorithm adopts an RBF neural network to approximate the nominal model of the press system. The update law of the algorithm is based on the Lyapunov function used to prove the stability of a closed-loop system. The sliding mode controller compensates for the neural network error and disturbance. Finally, experiments are executed on the servo press with an RBFS controller. To evaluate the performance of the proposed method, a fuzzy PID controller is also applied to the press for comparison. The results indicate that the servo clinching press system with RBFS efficiently and accurately control the clinching jointing process.
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Yongfei Wang,Sheng-Dun Zhao,Xuzhe Zhao,Yongqiang Zhao 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.8
In this study, the Recrystallization and partial melting (RAP) process was performed to prepare 6061 aluminum alloy semi-solid billets. The microstructural evolution and coarsening of the materials were investigated. During the RAP process, the 6061 aluminum alloy plate supplied in cold rolled state was heated to the semi-solid range. The results showed that both the average grain size and shape factor of solid grains increased along with the isothermal holding time and temperature. The coarsening of solid grains could be attributed to the coalescence and Ostwald ripening mechanisms, with the latter playing an increasingly important role as the isothermal holding time and temperature increased. At isothermal holding temperatures of 620, 625, 630 and 635 °C, the coarsening rate constants reached 333.1, 833.8, 1034.7 and 1271.9 µm/s 3 , respectively. Moreover, the coarsening rate constant gradually increased along with isothermal holding temperature.
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Xie, Jia,Kang, Do-Hyun,Woo, Byung-Chul,Lee, Ji-Young,Sha, Zheng-Hui,Zhao, Sheng-Dun The Korean Institute of Electrical Engineers 2012 Journal of Electrical Engineering & Technology Vol.7 No.5
Transverse flux machine (TFM) has been proved to be very suitable for high-torque, low-speed, and direct-drive situation in industry. But the complex structures and costly permanent magnets (PMs) are two key limitations of its wide range of applications. This paper proposes a new claw pole TFM (ACPTFM) which features an assembled claw pole stator and using the lamination steels material to overcome the complex structures. By combining response surface methodology (RSM) with design of experiment, an optimum design method is put forward to improve the PM's contribution to the torque in order to save the PM's amount. The optimum design results demonstrate the validity of the proposed optimum design method and the optimized model. Eventually, the finite-element analysis (FEA) calculation method, which is used in the optimization process, is verified by the experiments in a prototype.
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Jia Xie,Do-Hyun Kang,Byung-Chul Woo,Ji-Young Lee,Zheng-Hui Sha,Sheng-Dun Zhao 대한전기학회 2012 Journal of Electrical Engineering & Technology Vol.7 No.5
Transverse flux machine (TFM) has been proved to be very suitable for high-torque, lowspeed, and direct-drive situation in industry. But the complex structures and costly permanent magnets (PMs) are two key limitations of its wide range of applications. This paper proposes a new claw pole TFM (ACPTFM) which features an assembled claw pole stator and using the lamination steels material to overcome the complex structures. By combining response surface methodology (RSM) with design of experiment, an optimum design method is put forward to improve the PM’s contribution to the torque in order to save the PM’s amount. The optimum design results demonstrate the validity of the proposed optimum design method and the optimized model. Eventually, the finiteelement analysis (FEA) calculation method, which is used in the optimization process, is verified by the experiments in a prototype.
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