| 摘要 |
PURPOSE:To provide an abnormality detecting device of a bearing capable of nearly completely removing the noise component from an AE signal. CONSTITUTION:An envelope detection wave-form shaping circuit 6 constituted of a low-pass filter is provided at the next stage of an envelope detecting circuit 5. An AE signal envelope-detected by the envelope detecting circuit 5 is removed with the noise component having a shorter duration than the duration of the abnormality AE signal caused by the abnormality of a bearing by the envelope detection wave-form shaping circuit 6 constituted of a low-pass filter. |
