Thanks again for your answer Gr8blue.
Yes it's been tested, we've concluded that it's a mechanical issue.
Yes, my mistake! Actually the system goes into resonance at 1088 rpm -> 36,2 Hz (VFD frequency) which corresponds with a 18,1 Hz impeller frequency.
Hi Gr8blu,
The resonance is most prevalent parallel to the shaft. The nominal operating speed of the motor is 1477 rpm, the nominal speed of the impeller is 1476 rpm. The resonance starts to occur in the area between 800 and 900 rpm though.
Sorry Waross,
I forgot to answer your question about whether the origin is the motor or the fan. We've tested the fan to see if he maybe goes into resonance and takes the system with him. This wasn't the occasion. The motor and snailhouse seem to bend into eachother after looking at it with a...
Thank you for your answer Drawoh. I know about how stiffening the mount will change the resonant frequency. We already tried this though. We put multiple very strong bars of steel between motor pedestal and the snail house (this is what we call the housing in which the impeller rotates. To...
Hi everyone,
I'm a student who's doing an internship with IMEC, Belgium. I'm studying a fan powered by a motor. This fan-motor system goes in a resonance at a frequency between 30 and 40 Hz. The operating range of this fan is 30 to 40 Hz so we can't just skip these frequencies. We've tried...
