| 摘要 |
PURPOSE:To surely detect the abnormality of a rolling bearing by converting the mechanical oscillation generated from the rolling bearing under rotation to an electrical signal by using an acceleration sensor. CONSTITUTION:The acceleration signals detected by the acceleration detector 1 is converted in an electric charge change to a voltage signal in a charge amplifier part 2 according to need and is inputted to a band pass filter 3. The output from the filter 3 is converted to an absolute value signal by an absolute value circuit 4 and is inputted to an averaging circuit 5 and a peak detecting circuit 6. The circuit 5 smooths and averages the absolute value signal and detects the average value. The output from the circuit 4 is analyzed by a spectrum analyzer 7, by which the frequency component is measured. The frequency components of 1-8kHz are affected by the intermeshing oscillation of gears, etc. and the exact diagonosis is sometimes difficult with such frequency components in the diagnosis of overdriving and speed reduction gears, etc. The low limit frequency is therefore determined at 9-10kHz. Noticeable spectra are not generated in all of the abnormality in >=30kHz frequency components. There is therefore no need for detecting >=30kHz components.
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