Noise testing

As to bearing manufacturing, a frequency spectrum analyzer is used to measure the magnitude of vibration and the distribution of frequencies. A frequency spectrum analyzer can have a good control on the bearing vibration. Furthermore, the machine electronically translates these signals by a heterodyning process, making them audible, so that inspectors can hear these sounds from the machine speaker and see them as intensity increments in a meter. By this way, testing results also enable the determination of the likely cause of the bearing irregularity

Working process of a frequency spectrum analyzer

Machine basic vibration

Frequency

Speed		Low Band (L)		Medium Band(M)		High Band (H)
		Frequency
min.	max.
r/min.		Hz		Hz		Hz
882	909	50	150	150	900	900	5 000
1 764	1 818	50	300	300	1 800	1 800	10 000

Axial load applied on the vibration machine