<VV> Unique fan belt keeper-oner humor

[ray smith]

Do valvetrain harmonics for us !!!



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-----Original Message-----
From: "J R Read_HML" <hmlinc at sbcglobal.net>
Date: Thu, 28 Jan 2010 14:43:14 
To: <virtualvairs at corvair.org>; Dale Dewald<dkdewald at pasty.net>
Subject: Re: <VV> Unique fan belt keeper-oner humor

Oh, that cleared it right up for me... <big grin>

But, thanks for trying!

Later, JR

>
> Hello, I am a metallurgist, not an ME or EE, so those who are better at
> this please correct the following.
>
> As is often the case, an electrical analogy can be used to describe belt
> action as a first approximation.  Think of a LRC circuit.  The crankshaft
> is a source of electric power; a DC source (RPM) with an added AC 
> component
> (power pulses).  The fan is a capacitor (rotational inertia) with a large
> variable resistor across (airflow as a function of speed).  The alternator
> is a resistor (electrical load), and the belt is an inductor
> (stretch).  The bearings and pulley friction are additional resistances.
>
> LRC circuits can be either partially or fully damped (preferable in this
> case) and/or have a resonant frequency.  What Craig adequately stated is
> that a certain combination of components might mechanically resonate due 
> to
> the power pulses.  Using the electrical analogy we might predict how the
> change of one component (e.g. steel vs magnesium fan) might affect the 
> belt
> action.
>
> Dale Dewald
> Hancock, MI

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