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Adaptive Separation Model for Electromagnetic Pulse Coupling Signals of Engine Digital Controllers
Chen Kai,Wei Minxiang,Cao Jie,Chen Xinda,Li Shunming 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.4
The engine digital controller is vulnerable to attacks of wide-spectrum and uncertain electromagnetic pulses (EMPs). To address this issue, herein, we propose a novel “internal cluster evaluation cluster” clustering integrated signal separation method and establish an adaptive separation model for EMP coupling signals of engine digital controllers. Specifi cally, the proposed method mainly includes generation of base clusterings to form a candidate pool of base clusterings, evaluation of the uncertainty of clusters, and establishing an integration strategy. To verify the model, we adopt two types of EMP coupling signal data for simulation and actual measurement. The proposed method is compared with fi ve typical clustering ensemble methods in terms of their normalized mutual information (NMI) values. For the simulated EMP coupled signal data, the hyperparameter is 0.4, and the NMI values of fi ve sets of data are 0.721, 0.576, 0.329, 0.201, and 0.466. For the measured data, the hyperparameter is 0.8, and the NMI values of fi ve sets of data are 0.738, 0.555, 0.377, 0.511, and 0.485. The NMI values of the two types of EMP coupling signal data of the proposed method are generally better than those of the other classical methods. The results confi rm the superior separation eff ect of the proposed method on EMP coupled signals.
Reliability optimization design of hydraulic system considering oil contamination
Xinda Zhou,Zhaojun Yang,Hailong Tian,Chuanhai Chen,Liding Wang,Yongfu Zhu,Jia Liu 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.12
This paper presents a reliability optimization design method for a hydraulic system that considers oil contamination. The proposed method applies the quantitative relationship between oil contamination and system reliability to the reliability design of a hydraulic system, while considering the performance, layout, and other design factors. A global reliability model of the hydraulic system is constructed based on the oil contamination control model. Further studies aiming at an optimization design model of the hydraulic system is established where the cost is the objective function, reliability index, size and structure range, performance requirements are constraints, structure size and oil change period are design variables. For illustration, a case study on the reliability optimization design of the oil supply point branch of the static pressure bracket of a certain type of heavy CNC horizontal lathe is considered.