基于AMDF和DTS的洗衣机脱水阶段振动信号转速提取

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摘要国标GB/T4288-2018要求将传感器安装在洗衣机箱体上进行振动量检测，而转速测量要求传感器安装在洗涤筒外，效率较低。因此，提出采取利用外箱体的加速度传感器来进行脱水转速提取，可实现不拆卸状态下的转速及振动量的同时检测。根据洗衣机脱水阶段的上升控制段与自由衰减段转速曲线的不同特点，提出采用平均幅度差函数（Average magnitude difference function，简称AMDF）和差分阈值分段(Differential threshold segmentation，简称DTS)处理相结合的算法来提取脱水阶段振动信号对应的转速，判断并截除衰减段信噪比和能量过低信号对应的转速曲线，修正完整转速曲线中的少数奇异点。采用某型波轮洗衣机的三种不同的脱水时间模式进行实验，实验表明：实测的平稳段和目标段转速曲线和理论转速曲线相比较，误差满足国标精度要求。

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	常玉1
	高翠云1
	童怀俊2

关键词 ：振动信号, 转速提取, 平均幅度差函数, 差分阈值分段, 奇异点

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

收稿日期: 2018-08-14 出版日期: 2019-06-15

引用本文:

常玉1,高翠云1，童怀俊2. 基于AMDF和DTS的洗衣机脱水阶段振动信号转速提取[J]. 振动与冲击, 2019, 38(12): 90-97.
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. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(12): 90-97.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2019/V38/I12/90

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