I have a Vertical Motor where i'm facing high Vibration problems.
Fmax-1000Hz , 1600 LOR
Motor NDE- Hor-7.07 Ver- 4.77 and Axial- 0.91 mm/sec RMS.
Motor DE-Hor-4.07 Ver-2.50 and Axial-1.39 mm/sec RMS.
pump De-Hor-3.2 Ver-2.2 and Axial-1.01 mm/sec RMS.
But while taking data with 4000Hz and 6400LOR i could clear see the vibration going up to 10mm/sec RMS. and the acceleration value going to 58.22m/s^2 RMS.(Which was previously 1.54m/s^2 RMS while the Fmax was 1000HZ). I know that increasing Fmax will also increase Acceleration value as higher frequencies are more sensitive to acceleration but what i found in my vibration spectrum is bit complicated.
A high frequency Peak at 80587.5 CPM with amplitude of 5.39mm/sec RMS. And it has Running Speed Sidebands. But the running speed side band has amplitude of only 0.26mm/sec, whereas the 100 HZ side band has a Amplitude of 2.22mm/sec.
And some 2*(2*LF) and 4*(2*LF) also present.
But i'm assuming 74587.5 CPM as Center frequency because it has the matching hamonics.
I'm suspecting Rotor bar looseness and Severe Structural looseness.
Kindly help me solving This Pattern.