The Method of Electrical Life Prediction Considering the Audio Characteristics of AC Contactor
You Yingmin1,2, Wang Jingqin1, Shu Liang2, Ni Kan2, Zhou Xincheng2
1. State Key Laboratory for Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin 300130 China; 2. Yueqing Institute of Industry Wenzhou University Wenzhou 325035 China
Abstract：In this paper, the electrical life prediction method of AC contactor based on audio characteristics is studied. The audio characteristics of AC contactor under three states of abnormal coil voltage, contact wear and shell looseness are analyzed by using fast Fourier transform method. Compared with the normal AC contactor, the results show that the audio characteristics of AC contactor in abnormal state are significantly different from that in normal state. In order to further study the vibration and sound generation mechanism of contactor when closing, a sound field model is established based on vibration equation and sound pressure fluctuation equation. The simulation results show that the amplitude of the audio frequency spectrum generated by the acoustic field model increases with the increase of the working voltage of the coil, and the spectrum distribution changes with the change of the contact shape. BP neural network and convolutional neural network (CNN) are used to build the correlation model between AC contactor closing audio characteristics and electrical life. Four BP network learning algorithms, L-M algorithm, quasi Newton method, momentum BP method and adaptive gradient descent method, are compared. The verification results show that the performance of L-M algorithm is the best, and the prediction error is less than 10%; CNN can learn and extract audio features online, but its prediction error is more than 20%.
游颖敏, 王景芹, 舒亮, 倪侃, 周新城. 基于音频特征的交流接触器电寿命预测方法[J]. 电工技术学报, 2021, 36(9): 1986-1998.
You Yingmin, Wang Jingqin, Shu Liang, Ni Kan, Zhou Xincheng. The Method of Electrical Life Prediction Considering the Audio Characteristics of AC Contactor. Transactions of China Electrotechnical Society, 2021, 36(9): 1986-1998.
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