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RISS 인기검색어
- 검색키워드
- 저자 : Tianlei Wang (검색결과 4 건)
- 무료
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Magnetic field optimization for high-positioning-tolerant wireless charging platforms
Wang, Tianlei,Yang, Canjun The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.1
This paper proposes an omnidirectional high-positioning-tolerant wireless power transfer (WPT) platform using an array of large-scale coil units with moderate overlaps. A generalized magnetic field (MF) design and an optimization methodology for the coil layout are introduced based on analytical solutions of the MF distribution in 3D space. An MF density distribution matrix is derived, and basic evaluation criteria including both the MF uniformity and the MF intensity are quantitatively analyzed. Using a synthesized figure of merit (FoM) as an objective function, a sequential quadratic programming (SQP) algorithm is adopted to obtain the optimal parameters of the coil array. The maximal intensity and uniformity of the induced MF are achieved simultaneously. Both theoretical and experimental results demonstrate equal and stable system performance when a power receiver is placed arbitrarily on the platform.
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Research on LPF-GSMC Control of Molten Metal Crane Based on Multi-mass-spring-damping Model
Tianlei Wang,Nanlin Tan,Jing Zhou,Jiongzhi Qiu,Xianwen Zhang,Yanyang Liang 제어·로봇·시스템학회 2024 International Journal of Control, Automation, and Vol.22 No.1
The molten metal crane faced with high difficulty to control can be mainly attributed to the features as a typical underactuated system and liquid sloshing phenomenon is often ignored in the existing control methods. Consequently, this paper firstly establishes the multi-mass-spring-damping mechanics model of liquid sloshing, followed by deducing the dynamics equation of the molten metal crane system based on the model in detail, which verifies the correctness of the system model from the physical sense. Then, a low pass filter global sliding mode control (LPF-GSMC) is introduced to effectively eliminate the high frequency signals of the system and keep the system on the sliding mode surface. Lastly, a hardware experiment and three kinds of numerical simulations were designed for the molten metal crane system. The hardware experiment shows that compared with the traditional solid-load model, the proposed model is more consistent with the dynamic characteristics of liquid load during transportation. And the numerical simulations show that compared with the conventional sliding mode controller and low-pass filter sliding mode controller, the proposeed LPF-GSMC controller possesses higher response speed and better control performance. Also, under the interference of wind and the non-zero initial angular, the proposed controller can ensure that the maximum load swing angle is less than 2◦ degrees and converges within 7 seconds, which fully demonstrats favorable global robustness.
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Underwater contactless wet‑mateable connector using bowl‑shaped coils
Qichao Zhao,Tianlei Wang,Hui Zhi,Xin Wu,Yurui Zhang,Canjun Yang,Yanhu Chen 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.7
Wet-mateable connectors enabling power and communication for underwater equipment are greatly favored for underwater systems. However, conventional underwater wet-mateable connectors with electrical contact conductors have the features of high cost, limited mate/de-mate times, and high risk of ground faults when being applied underwater, which limits their used. In this paper, a contactless underwater wet-mateable connector with bowl-shaped couplers was proposed, and an equivalent circuit for inductive power transmission was modeled and analyzed. Then the mathematical expression of the magnetic induction intensity of the bowl-shaped coil was derived. The parameters including co , zco , and s0 of the coil were analyzed and optimized to attain better performance and lower cost. A prototype was built and tested. Results showed that it can transmit power up to 1125 W with an efficiency of 85%. In addition, it can achieve a data rate up to 6 MB/s under a water pressure of 20 MPa.
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A real-time sorting algorithm for in-beam PET of heavy-ion cancer therapy device
Ke, Lingyun,Yan, Junwei,Chen, Jinda,Wang, Changxin,Zhang, Xiuling,Du, Chengming,Hu, Minchi,Yang, Zuoqiao,Xu, Jiapeng,Qian, Yi,She, Qianshun,Yang, Haibo,Zhao, Hongyun,Pu, Tianlei,Pei, Changxu,Su, Hong Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.10
A real-time digital time-stamp sorting algorithm used in the In-Beam positron emission tomography (In-Beam PET) is presented. The algorithm is operated in the field programmable gate array (FPGA) and a small amount of registers, MUX and memory cells are used. It is developed for sorting the data of annihilation event from front-end circuits, so as to identify the coincidence events efficiently in a large amount of data. In the In-Beam PET, each annihilation event is detected by the detector array and digitized by the analog to digital converter (ADC) in Data Acquisition Unit (DAQU), with a resolution of 14 bits and sampling rate of 50 MS/s. Test and preliminary operation have been implemented, it can perform a sorting operation under the event count rate up to 1 MHz per channel, and support four channels in total, count rate up to 4 MHz. The performance of this algorithm has been verified by pulse generator and <sup>22</sup>Na radiation source, which can sort the events with chaotic order into chronological order completely. The application of this algorithm provides not only an efficient solution for selection of coincidence events, but also a design of electronic circuit with a small-scale structure.
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