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RISS 인기검색어
- 검색키워드
- 저자 : Yan Zhi-Bang (검색결과 4 건)
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Zhi Ma,Chung-Bang Yun,Yan-Bin Shen,Feng Yu,Hua-Ping Wan,Yao-Zhi Luo 국제구조공학회 2019 Smart Structures and Systems, An International Jou Vol.24 No.4
A Bayesian dynamic linear model (BDLM) is presented for a data-driven analysis for response prediction and load effect separation of a revolving auditorium structure, where the main loads are self-weight and dead loads, temperature load, and audience load. Analyses are carried out based on the long-term monitoring data for static strains on several key members of the structure. Three improvements are introduced to the ordinary regression BDLM, which are a classificatory regression term to address the temporary audience load effect, improved inference for the variance of observation noise to be updated continuously, and component discount factors for effective load effect separation. The effects of those improvements are evaluated regarding the root mean square errors, standard deviations, and 95% confidence intervals of the predictions. Bayes factors are used for evaluating the probability distributions of the predictions, which are essential to structural condition assessments, such as outlier identification and reliability analysis. The performance of the present BDLM has been successfully verified based on the simulated data and the real data obtained from the structural health monitoring system installed on the revolving structure.
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Li Zheng,Yan Zhi-Bang,Zhang Lu-Cheng,Liu Yu,Zhang Hong-Jie,Sun He-Xu 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.3
In recent years, under the background of low carbonization and industrial intelligence, with the rise of new energy sources such as wind energy and solar energy, rare earth permanent magnets have begun to be widely used in generators of these new energy sources. From the perspective of green and sustainable development, permanent magnet motor can reduce energy loss and meet the requirements of sustainable development through the reasonable selection and utilization of permanent magnet materials, the design of motor structures, and advanced transmission control technology. In this paper, a 225 kW/34,000 rpm high speed permanent magnet motor (HSPMSM) is designed. Firstly, the electromagnetic design of the motor is carried out, and the fnite element model is established. The rotor temperature rise under diferent materials is analyzed by comparing the electromagnetic characteristics and loss of diferent permanent magnet materials and using the principle of electrothermal coupling. Combined with the thermal performance of the material, the advantages of rare earth permanent magnet are analyzed, and SmCo permanent magnet material is selected to be more suitable for the motor. Due to the motor's high speed and high frequency harmonic rate, an improved proportional resonant algorithm based on active disturbance rejection is studied and analyzed. Compared with the traditional PI control, the algorithm further reduces the harmonic content of the motor's stator current while improving the motor's running state, thereby reducing the overall loss of the motor. The prototype and experimental platform are made, and the experimental results verify the correctness of the simulation analysis.
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Nonsingular Fast Terminal Sliding Mode Control Strategy for PMLSM Based on Disturbance Compensation
Li Zheng,Zhang Zi-Hao,Wang Jin-Song,Yan Zhi-Bang,Guo Xiao-Qiang,Sun He-Xu 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.3
To optimize the anti-interference performance and dynamic response ability of permanent magnet linear synchronous motor (PMLSM) and enhance the overall control performance of the system, the novel nonsingular fast terminal sliding mode controller (NFTSMC) based on disturbance compensation is proposed in this design. To enhance the response speed and stability of the controller, this design introduces the system state variable into the exponential reaching law to make the controller adaptively adjust with the change of the system state, which can reduce the chattering of the system and have a faster response speed. The extended sliding mode disturbance observer is designed to estimate the interference factors in the system, and the controller is feedforward compensated to further improve the anti-interference ability of the PMLSM system. Meanwhile, the control strategy is proved by the Lyapunov stability theory. Simulation and experiments show that the proposed control strategy has better dynamic response ability and anti-interference ability than the traditional NFTSMC.
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