Article View: comp.sys.amiga.tech
Article #12356Re: Noisy Fan on 2000
From: Frank Cunningham
Date: Mon, 24 Apr 1989 21:07
Date: Mon, 24 Apr 1989 21:07
19 lines
1540 bytes
1540 bytes
> supply on with the new fan just dangling---it was practically silent.
> "Wow!" I thought, put everything back together, turned the power on,
> and---the new fan was as noisy as the last one (but no more periodic
> garbage disposal). It looks to me like the 2000's fan is noisy only
> because it's accoustically coupled to the rest of the machine. I know
I haven't checked this on the Amiga yet, so I'm perfectly qualified to
comment: Your guess is obviously correct, and there are two
mechanisms: mechanical and acoustical. Mechanical covers motor noise
like bearings. Acoustical is much more interesting and covers "white"
noise effects that result from cramming the air through grates and
filters, and siren effects that result from the fan blades rotating
near supporting members and chopping the air stream. It is difficult to
eliminate this noise without keeping the fan blades away from
miscellaneous gratings. Even the fan motor struts aggravate the problem.
--
-Frank Cunningham smart: fc@lexicon.com
dumb: {husc6,linus,harvard,bbn}!spdcc!lexicon!fc
phone: (617) 891-6790
Technical Details
Message-ID:
<418@lexicon.com>Path:
arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!purdue!decwrl!decvax!ima!spdcc!lexicon!fcReferences:
<9891@netnews.upenn.edu> <6622@cbmvax.UUCP> <7916@killer.Dallas.TX.US> <12763@pasteur.Berkeley.EDU>Show Full Headers
Complete Article Headers
Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!purdue!decwrl!decvax!ima!spdcc!lexicon!fc From: fc@lexicon.com (Frank Cunningham) Newsgroups: comp.sys.amiga.tech Subject: Re: Noisy Fan on 2000 Message-ID: <418@lexicon.com> Date: 24 Apr 89 21:07:03 GMT References: <9891@netnews.upenn.edu> <6622@cbmvax.UUCP> <7916@killer.Dallas.TX.US> <12763@pasteur.Berkeley.EDU> Organization: Lexicon, Inc., Waltham, MA Lines: 19