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Date:         Tue, 5 Aug 2008 22:09:18 -0700
Reply-To:     Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Subject:      Re: [NVC] Engineers: quick and cheerful vibration analysis?
Comments: To: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
              reply-type=original

I thought you were perhaps going to put a big clear jug of water in the back, and watch how it jiggles or sloshes in the rear view mirror. ..... sometihng akin to that. But you're going with an accelerometer and lap top !!

reminds me of this famous story - about being too complex in figuring something out : For his first assignment, a new assistant to Thomas Edison was given the task of determening the interior volume of a light bulb. The new assistant spent hours caluclating the interior volume of such a complex shape. When he was finally done..........he showed the result to Edison. He was close, but not quite correct. Edison then showed him how to drill a tiny hole in the light bulb, fill the light bulb with fluid, then empty that out into a measuring beaker to get the true interior volume, in just minutes. And with no calculating.

Perhaps you'd like to try jello in the tires ? I think that might get you the damping you seek. There is , or was, such a thing as tire balancing fluid too, for motorcylces, once upon a time. Or it was a pure scam.

Might be a case here too, of tee many martoones, given the time of night. LOL ! man..........you need some more serios things to wonder about !!! Can't wait to hear what results you get. smiles, scott

----- Original Message ----- From: "Dennis Haynes" <d23haynes57@HOTMAIL.COM> To: <vanagon@GERRY.VANAGON.COM> Sent: Tuesday, August 05, 2008 9:14 PM Subject: Re: [NVC] Engineers: quick and cheerful vibration analysis?

> Sure it could be done, bring money. > > One thing about trailer tires, inflation pressure needs to set by the > load. They are small and they spin fast and they are poorly made and they > love to blow out. Squishy trailer tires are guaranteed failures, even > small ones. > > Dennis > > -----Original Message----- > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of > Mike Elliott > Sent: Wednesday, August 06, 2008 12:06 AM > To: vanagon@GERRY.VANAGON.COM > Subject: [NVC] Engineers: quick and cheerful vibration analysis? > > This is a question for the engineering geeks here. > > Say you were towing a little trailer behind your Vanagon. Say that the > trailer had a rudimentary suspension consisting only of leaf springs. Say > that this trailer also had tires, the pressure of which could be adjusted: > higher pressure results in a harsher ride, while lower pressure results in > a softer ride. Say you wanted to determine the optimum pressure of ride vs > tire squishiness but were unable to find a small boy to ride in that > trailer to report back about smoothness of ride v tire pressure while the > experiments were being conducted, so lacking that small boy, your thoughts > naturally turn to instrumentation. Okay, so say you had a laptop computer > (WinXP) which could ride in the passenger seat, and /three/ business days > in which to acquire the needed sensor (accelerometer?) as well as the > software to display the ride bounciness. > > Could it be done? > > -- > Mike "Rocket J Squirrel" Elliott


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