Talk:Hunting oscillation

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Untitled

The Japanese article on this subject appears to include additional information not covered here. Unfortunately, I can't speak a word of Japanese. Could some kind translator out there please have a go at translating the Japanese article. If you are a native Japanese speaker, with limited grasp of English, please have a go, I'm sure we can sort out the grammar and style issues once we have got a first iteration to work with. Gordon Vigurs 09:45, 27 August 2006 (UTC)[reply]

Swaying?

Sorry, always nit-picking, but to me swaying is what a drunk does rotating vertically pivoting on his feet (rolling and pitching?), whereas hunting is a horiontal oscillation around a vertical axis. I surmise that the image may originally have been one of a dog following a scent sniffing right and left. This is more like the motion of a railway vehicle described. In aircraft flight as I understand it, you have three basic oscillations to contend with pitching, rolling and yawing (the equivalent of hunting?).--John of Paris 10:02, 3 July 2007 (UTC)[reply]

The swaying motion refers to the qualitative manifestation of hunting in complete railway vehicles - a mix of lateral translational motion and yaw. The analysis here is restricted to wheelset hunting, which is about the only level amenable to analystical solution. The real situation is much more complex. If you can imagine the wheels sets and bogies at either end of the actual vehicle oscillating from side to side, not necessarily in synchronisation, you will get the picture. Gordon Vigurs 07:39, 9 July 2007 (UTC)[reply]

Proposed merger

Fine, provided that the detailed railway engineering diagrams and calcuations go at the bottom - "hunting" is used in a wide range of contexts. Philcha (talk) 10:43, 20 April 2008 (UTC)[reply]

No It is an article specific to railway engineering, where the wheels are fixed on the axle, and should be tied into other such articles, particularly wheelset (rail transport) and Bogie Perhaps it should be renamed to reflect this. Chevin (talk) 11:07, 22 January 2009 (UTC)[reply]

Except hunting oscillations occur in other things, such as motorbikes etc.

The page should be moved to "Hunting oscillations (rail)" or generalised.77.86.67.245 (talk) 21:17, 11 April 2009 (UTC)[reply]

It's all greek to me!

I just tried to understand this, but it's fairly heavy in terms of mathematics. I appreciate that the authors have spent a lot of time trying to give an accurate, full, account of what causes hunting oscillation, but even the summary ("The classical Hunting oscillation is a swaying motion of a railway vehicle caused by the coning action on which the directional stability of an adhesion railway depends") doesn't really convey much to the layman beyond the notion that a vehicle might sway (and it doesn't help that "Coning" in the above links to the definition of the word "Cone".)

A couple of things might help here. Before the heavy maths part of the article, some kind of brief layman's language description of how the wheelsets sway (that is "In Hunting oscillation, a wheelset - two flanged rail riding wheels attached to a common axle - moves left and right, relative to the track, progressively more violently" - I have no idea whether that wording is right! But you get the idea of what kind of language I'm looking for) and broadly what causes it ("The cone-like nature of the wheels themselves means that the wheelset has no fixed, horizontal, relationship to the rails - that is, if the wheels are slightly to the left, the wide side of the left wheel and thin side of the right will be in contact with the rail, causing the axle to be higher on the left than on the right. The changed center of gravity causes the wheels to slip back into the opposite direction as the train moves.")

Again, no idea if what I just said is right because I don't understand the article, but it's an example of the kind of language that might be easier to understand.

Even better would be more diagrams, or even a short animation.

Does this make sense? Is this even possible? --66.149.58.8 (talk) 18:32, 18 December 2009 (UTC)[reply]

Name origin

It's not clear to me whether the term Hunting oscillation is named for a person named Hunting, or if it is a behavioral description. This could easily be cleared up in the lead by someone knowelgeable. 70.247.164.231 (talk) 03:55, 28 August 2010 (UTC)[reply]