Ooh - you smart guy!
--
Mike "Rocket J Squirrel" Elliott

On 8/7/2008 4:41 PM Michael Diehr wrote:

> Or... borrow a small boy who owns an iPhone, tell the kid to take a
> hike, and buy an iPhone accelerometer app, such as G-Force
>
> Net cost: $0.99
>
> http://phobos.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=286780085&mt=8
>
>
> On Aug 6, 2008, at 8:06 AM, Jake de Villiers wrote:
>
>> You could use a clip-on transducer, meant to plug in to a tuner.
>> Prolly $10
>>
>> On Wed, Aug 6, 2008 at 7:46 AM, Mike Elliott <camping.elliott@gmail.com
>>> wrote:
>>> On 8/5/2008 9:14 PM Dennis Haynes wrote:
>>>
>>> Sure it could be done, bring money.
>>> Aw, 3D accelerometers are not expensive, consider the Wii
>>> controller. I've
>>> used cheap polymer film piezo transducers in the past, the output
>>> of which
>>> could go to the input of my existing Picoscope oscilloscope box that
>>> connects to the laptop via USB. I just don't think I can get even a
>>> 1-axis
>>> accelerometer in the time I have remaining.
>>>
>>> Wait - I might be able to find a stick-on piezo pickup for guitars,
>>> upright basses or cellos at a music store nearby.
>>>
>>> Or, use a Radio Shack piezo mic, like shown here:
>>>
>>> http://home.earthlink.net/~erinys/contactmic.html<http://home.earthlink.net/%7Eerinys/contactmic.html
>>> And stick it to the body of the trailer with double-sided foam tape.
>>>
>>> -- Mike RJS
>>>
>>>
>>>
>>>> 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
>>>>
>>>>
>>
>> --
>> Jake
>> 1984 Vanagon GL
>> 1986 Westy Weekender "Dixie"
>> Crescent Beach, BC
>> www.crescentbeachguitar.com
>> http://subyjake.googlepages.com/mydixiedarlin%27
>