Re: A wheel by any other name

Posted by KEB on October 16, 2006 at 20:29:27 from (72.19.170.5):

In Reply to: A wheel by any other name posted by jc on October 16, 2006 at 12:28:14:

To add to what janicholson said, its called a harmonic balancer because it "balances" (damps, actually) vibrations at some multiple, or "harmonic", of the rotational speed. For example, in a V8 engine there are four power strokes per revolution, which means the cranshift gets a large twisting pulse applied to it four times per revolution at four different points along its length. These pulses cause a torsional (or twisting) vibration of the crankshaft, at four times the rotational speed of the engine. Don't know for sure, but suspect at certain speeds the crankshaft could be mechanically resonant and have torsional vibrations at higher multiples, such as 8, 12, 16 etc., times the rotational speed.

Keith

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