Rotation speed extraction from vibration signals in the dehydration stage of a washing machine based on AMDF and DTS

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (12) : 90-97.

CHANG Yu1 ，GAO Cuiyun1，TONG Huaijun2

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Abstract

To meet the national standard GB/T4288—2018, the sensors are required to be installed on the shell of washing machines for vibration parameters detection, and the measurement for rotation speed requires the sensor to be installed outside the wash basket, which is less efficient.Therefore, it was proposed to use an acceleration sensor on the shell of a washing machine to extract the dehydration rotation speed, and it is supposed to detect the rotation speed and the vibration parameters simultaneously without disassembling the machine.The difference between the rising control curve and the free descending section of the washing machine dehydration stage were analyzed, a novel method combining average amplitude difference function (AMDF) and differential threshold segmentation (DTS) was proposed to extract the rotation speed from the vibration signal in the dehydration stage of the washing machine.The relevant rotation speed curve of the vibration signal part with too low SNR and energy at the descending section was found and cut, and a few outliers in the whole speed curve were corrected.The method was tested by using a certain type of a pulsator washing machine under three kinds of modes with different dehydration time.The experiment results show that the errors between tested rotation speed curve and theoretical rotation speed curve of steady stages and setting goal stages meet the error requirements of the national standard.

Key words

vibration signal / rotation speed extraction / AMDF / differential threshold segmentation / outlier

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CHANG Yu1,GAO Cuiyun1,TONG Huaijun2. Rotation speed extraction from vibration signals in the dehydration stage of a washing machine based on AMDF and DTS[J]. Journal of Vibration and Shock, 2019, 38(12): 90-97

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