Behaviour of semi trailers in tight sag curves
Behaviour of semi trailers in tight sag curves
(OP)
I'm a civil engineer, but this issue may be relevant to automotive engineering, so I want to hear your opinion on it.
I have to design a road for a large semi-trailer. In my simulations, the back end of the semi-trailer always snags the ground in sags.
There are 4 rear axles and no front axles. In the simulations, as the truck moves into the sag, more and more load is put on the rear most axle till it's completely inside the chassis. Is this even possible?
What would be a realistic distribution of load in this case.
I have to design a road for a large semi-trailer. In my simulations, the back end of the semi-trailer always snags the ground in sags.
There are 4 rear axles and no front axles. In the simulations, as the truck moves into the sag, more and more load is put on the rear most axle till it's completely inside the chassis. Is this even possible?
What would be a realistic distribution of load in this case.





RE: Behaviour of semi trailers in tight sag curves
Combined suspension and tire spring rates, unequal compression as the roadway drops out from underneath the more forward axles, whether the axles are all independent of each other or if any two are in tandem (and which ones), maybe even bending deflection of the trailer frame, severity and extent of the 'sag', etc.
Norm
RE: Behaviour of semi trailers in tight sag curves
... but I don't do that stuff for a living.
You should probably be talking with people who do.
Let's hope that some of them show up here.
... or you can call some trailer builders on the phone, and social engineer your way to the people who know this stuff.
Mike Halloran
Pembroke Pines, FL, USA
RE: Behaviour of semi trailers in tight sag curves
Or are you looking to accommodate a range of commercial vehicles?
Jay Maechtlen
http://www.laserpubs.com/techcomm
RE: Behaviour of semi trailers in tight sag curves
You can see the exact configuration here: http://www.defence.gov.au/jlc/Documents/Cleaning%2...
Most other vehicles that will drive on this road are obviously of military spec and have no problem with any conceivable road geometry.