Diagnosis of rolling bearing

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Application as usage

Application as usage

If damage of facility, equipment etc. is found at an early stage, it is minimal.
In this example, FFT analyzer performs frequency analysis on abnormal vibration of a rolling bearing to diagnose whether the bearing is damaged or not.

1) Input the signal from an accelerometer attached on the rolling bearing into the CF-4700 FFT comparator.

2) Filter the frequency band of vibration caused by damage with the amplitude modulation component extraction function
(optional), and analyze the basic frequency corresponding to the damaged sections by the envelope function.

3) Diagnose the bearing status with the amplitude of that frequency and determine the maintenance timing.
In addition, you can set the filter while listening to the sound with headphones.

イラスト（システム構成）

イラスト（異常振動発生原因測定の流れ）

Configuration

	Model name	Item name	Remarks
1	CF-4700	FFT comparator
2	CF-0473 (option)	Amplitude modulation component extraction function
3	NP-3000 series	Accelerometer (with built-in preamplifier)	With CCLD (or TEDS) function
4	HT-5500	Handheald digital tachometer	Detects 1 rotation per pulse (reflective mark)

Key points

•When a rapid waveform like a scratch on a bearing is expected, it is possible to analyze the occurrence cycle of scratches
by performing envelope processing through a band pass filter.
•Measures rotation speed.
•Pay attention to the mounting position of the accelerometer.
(Be sure to mount it close to the bearing, where the vibration value is high.)

•It is important to check the specifications of the bearing in advance.

Revised:2018/10/31

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