In a message dated 1/2/2006 1:21:43 AM Eastern Standard Time,
WRJJRS@aol.com writes:
Very interesting Rusty,
I suggest that you Google the BD-5 and vibration study. The article
talks about the problems of harmonic vibration and is very interesting and
understandable as there are no mathematics (vibration studies are very
involved) rather there is a discussion of the results of making the system
work. I would suggest that anyone thinking of longer shafts or belts read this
article.
Bill Jepson
One quick fix is adding a bit of flywheel mass. The race car can idle right
down, RPM wise but with no flywheel, it shakes the trans so hard you hear it
above the considerable exhaust note. So, the idle is set at 2,200 RPM. Seems
real happy there and makes no trans noise.
The missing rotor looked like flywheel mass to the system. So removing it
raises the RPM where one of the nodes is peaking.
The BD-5 article is a must read for all builders, just to get the hair on
the back of your neck standing up.
Like chain spank on a go kart. Lighter shoes in the clutch keeps the chain
and sprockets out of the system until the RPMs are above the problem speed. Like
a higher stall speed converter, or a softer coupling, or more flywheel (effect)
mass.
A manageable problem.
Lynn E. Hanover