Posted by Steve@Advance on November 30, 2018 at 18:18:40 from (66.169.147.211):
In Reply to: washboard roads posted by 37chief on November 30, 2018 at 17:01:13:
My theory, for what it's worth... LOL
It falls back on nature takes the path of least resistance.
Forces of nature tend to move in waves, think sound, light, vibrations, etc.
Look at the ripples on a sand dune, waves on the ocean, wind blowing across a grassland. All travel in rhythmic motions, each being influenced by the one going before and after.
If you have ever tried to run a metal lathe, chatter is always your worst enemy. The tool naturally wants to chatter, once it starts it will rapidly get worse until you take corrective action, which sometimes can be very frustrating to find!
Now think about a wheel rolling over a fluid surface (sand, gravel, asphalt). It naturally wants to react to the balance of gravity vs rebound, same thing any moving object wants to do. Doesn't take long for a pattern to develop, pushed up by the high spots, rebounding forming a low spot, just like a chattering lathe tool, waves on water, wind driven dune ripples.
What's worse about the rolling wheel, the shock absorber tries to control the bounce, but is not 100% effective, then there is the uncontrolled rebound of the pneumatic tire, you have the perfect storm for making of a washboard road!
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