P. A. Schilke
Well-Known Member
- First Name
- Phil
- Joined
- Apr 3, 2019
- Threads
- 142
- Messages
- 7,016
- Reaction score
- 36,205
- Location
- GV Arizona
- Vehicle(s)
- 2019 Ranger FX4 Lariat 4x4, 2020 Lincoln Nautilus, 2005 Alfa Motorhome
- Occupation
- Engineer Retired
- Vehicle Showcase
- 1
Hi Matt,The only excessive bouncing I see is when the waves in the road (usually on concrete as opposed to asphalt) match the distance between the axles of the truck and trailer. So it creates a sort of natural frequency affect, which is not dangerous with the size of my trailer but can be quite annoying and hard to get out of.
We call the condition you describe as California Freeway Hop. It is the slight potatochiping of individual slabs of concrete being the excitation source. At certain speeds with certain wheelbases you get this vehicle head bobbing. Modern pavement milling techniques have minimized this in the USA, but not all roads. You are also correct that it is hard to stop once the excitation starts unless you can slow way down or speed way up which many times traffic will not permit.
Best,
Phil Schilke
Ranger Vehicle Engineering
Ford Motor Co. Retired
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