一种基于振动位移的扬声器异音故障检测方法-天津科技大学学报.PDFVIP

第 27 卷 第 3 期 天津科技大学学报 Vol. 27 No. 3 2012 年 6 月 Journal of Tianjin University of Science Technology Jun. 2012 一种基于振动位移的扬声器异音故障检测方法 许增朴，关 帅，王永强，周聪玲 (天津科技大学机械工程学院，天津 300222) 摘 要 ：为了满足扬声器纯音检测的需要 ，提出了一种基于激光位移传感器的扬声器异音故障检测方 ．该方法利用 激光位移传感器采集扬声器纸盆中心振动信号 ，通过短时傅里叶变换将扬声器振动信号从一维的时域信号变换成两 维的时频域信号．对时频图采用多级阈值分割的方法进行图像分割 ，统计其高频区域灰度值落于 0 ～0.3 的所有像素个 数作为特征值 ，进而判断扬声器的好坏．实验表明，此方法对扬声器异音故障检测的正确率可达到 97%． 关键词 ：扬声器；激光位移传感器；短时傅里叶；图像分割 中图分类号：TP274 文献标志码 ：A 文章编号 ：1672-6510 (2012)03-0064-04 Vibration Displacement Based Fault-detecting Method for the Loudspeakers ’ Sound Distortion XU Zengpu ，GUAN Shuai ，WANG Yongqiang ，ZHOU Congling (College of Mechanical Engineering ，Tianjin University of Science Technology ，Tianjin 300222 ，China) Abstract ：In order to meet the needs for speaker pure tone detection ，a sound fault detecting method based on laser dis- placement sensors was proposed. Using laser displacement sensors to collect the vibration signals at the center of the speaker cone ，and by means of short-time Fourier transform ，the vibration signals were transformed into two-dimensional time- frequency domain signals from one-dimensional time-domain signals. Multilevel threshold segmentation method was used to segment images. Finally the number of pixels whose gray value is between 0 and 0.3 i