Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
Freight train aerodynamics
- Thread starter quizzard
- Start date
Search for information on the Davis formula. This is the most commonly used one.
Factors include type of bearing, flange contact, weight on axles, and wind resistance. Different factors are used for leading and trailing cars. It is mostly experimentally derived from train data.
We make rr maintenance equipment. I have found davis to be optimistic (lower than actual rollng resistance) for lower speeds, smaller wheels, and for equipment with lots of stuff hanging out all over (ie. no body or shrouds). It has as expected worked well for higher speeds, larger wheels, and shapes and surfaces similar to car bodies.
kcj
Factors include type of bearing, flange contact, weight on axles, and wind resistance. Different factors are used for leading and trailing cars. It is mostly experimentally derived from train data.
We make rr maintenance equipment. I have found davis to be optimistic (lower than actual rollng resistance) for lower speeds, smaller wheels, and for equipment with lots of stuff hanging out all over (ie. no body or shrouds). It has as expected worked well for higher speeds, larger wheels, and shapes and surfaces similar to car bodies.
kcj
- Status
Similar threads
- Locked
- Question