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Hunting Prevention of High Speed Intermodals
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[quote]QUOTE: <i>Originally posted by oltmannd</i> <br /><br />jruppert- <br /> <br />It's more a matter of stable vs unstable and at what speed threshold the instability occurs. For a given system, things may be stable at 5 mph meaning there can never be hunting. However at 70 mph, the system may be unstable. This does not mean there WILL be hunting, but there CAN be hunting, if something excites it. Some of the main variables in a railcar related to hunting are length (truck centers and overall), wheel taper, gauge "tightness", polar moment of intertia and speed. Short, empty cars are notorious as are bulkhead flats for hunting. <br /> <br />An example: <br /> <br />Amtrak tested their roadrailer equipment for weeks at speeds up to 110 mph on the NEC only to have it hunt like crazy in NM at 90 mph on the ATSF. The difference turned out to be the ATSF had slightly tighter gauge. The problem was fixed with constant contact sidebearings. <br />[/quote] <br /> <br />Maybe I should take the list of variables you have given as well enough of an answer. Maybe explaining this stuff is a subject too lengthy for the forum. <br /> <br />One more question though; hunting trucks at opposite ends of a car? A series of hunting cars in a train? I never thought of it.
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