Changing Pitch Noise at inlet
Changing Pitch Noise at inlet
(OP)
I have been given the task of quieting a vacuum drum on a machine. It's a rotating drum with a pattern of holes covering the entire drum. It rotates around a shaft with a slot in it. Attached is a vacuum pump. This drum sucks and as it rotates advances paper downstream. The sound is very high pitch. Where would one start trying to reduce the noise level or change the pitch. The drum is 2.5" around and runs at 850ft/s. HELP!





RE: Changing Pitch Noise at inlet
"I'm all in favor of keeping dangerous weapons out of the hands of fools. Let's start with typewriters."
- Frank Lloyd Wright (1868-1959)
RE: Changing Pitch Noise at inlet
RE: Changing Pitch Noise at inlet
RE: Changing Pitch Noise at inlet
"I'm all in favor of keeping dangerous weapons out of the hands of fools. Let's start with typewriters."
- Frank Lloyd Wright (1868-1959)
RE: Changing Pitch Noise at inlet
As the mesh drum rotates, the air will be drawn through the mesh in a similar manner to it being drawn through the holes.
This will get rid of, to a large extent, the siren effect caused by the holes chopping the stream of air. It is essentially making the holes very small.
RE: Changing Pitch Noise at inlet
"I'm all in favor of keeping dangerous weapons out of the hands of fools. Let's start with typewriters."
- Frank Lloyd Wright (1868-1959)
RE: Changing Pitch Noise at inlet
Thanks again.
RE: Changing Pitch Noise at inlet
"I think it would be a good idea."
- Mahatma Gandhi (1869-1948),
when asked about Western civilization
RE: Changing Pitch Noise at inlet