Subject: rebuilt high pressure hose to rack growl
konstantin.bogach at morganstanley.com
Wed Feb 20 18:58:17 EST 2002
Is it common to fight resonance in hydrolic systems? In general, there is
everything for it: periodicity, boundaries, source, media. I even had some
thoughts about it when I found that they put restrictor not exactly in same
place as original hose.
Damn! Not again!
Arun Rao wrote:
> It turns out that even the dealers (Carlsen Audi in Palo Alto in my
> case) sell two kinds of "OEM" hoses. The cheaper (apparently
> aftermarket) one growls, the more expensive one doesn't. Trust Audi to
> make a hydraulic hose a tuned cavity (or maybe it's common practice): as I
> understand it, if any of the components in the system isn't quite right
> (hose material, restrictor diameter), you get nice standing waves in the
> hose and consequent growling.
> There you have it :(
> On Wed, 20 Feb 2002, Christopher Ritchie wrote:
> > Konstantin Bogach wrote (in part):
> > rebuilt hose to steering rack growls from very beginning. I
> > came
> > across reports about this problem but other posts did not have
> > such
> > complains. Because it seems so simple - hose + restrictor, I
> > decided to
> > go for it.
> > Any idea why it growls?
> > ***********************
> > No idea. But mine has been doing the same thing now for over 1 year. No
> > problem with old hose and old rack. When rack replaced (with Jorgen), new
> > OEM hose installed. Started growling immediately thereafter. Moderate at
> > first. Now hardly noticeable. Seems to diminish with use.
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> Arun Rao
> Pixar Animation Studios
> 1200 Park Ave
> Emeryville, CA 94608
> (510) 752-3526
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