土木技術應用於鐵路軌道方面最主要在於鋼軌的噪音振動、軌枕的受力關係、道碴的垂縱側向阻力、輪軌接觸關係等，而其中輪軌接觸關係可以探討的內容包含輪軌接觸力、蠕滑力、蛇行動理論等，其中蛇行動理論又可探討穩定狀態或不穩定狀態之蛇行動頻率、振幅。
對於蛇行動理論，自1883年Klingel提出Klingel運動之公式後至今，以數值模擬的方式觀察者以非常罕見，若論以實際現地量測或以室內輪軸滾動試驗機觀察者又更寥若晨星。
本實驗訂製一台單輪軸滾動試驗機，並利用非接觸式之位移量側以及轉速量側，用以比較C.Esveld所著書籍MODERN RAILWAY TRACK [1]的公式，並延伸探討對於輪軌束制度高低對於蛇行動現象的影響，期許未來對於量測輪軌接觸力的後續研究立下引導方向之指標。

In order to make the bogie design simple and reduce the wear between the wheel and the rail, the train does not design a differential to turn. In order to be able to pass the curve smoothly, the design wheel has conicity. The conicity causes the axle to produce periodic left and right sway and rotate the oscillating head when driving in a straight line. This phenomenon is called hunting movement.

The first ancestor of the study of the hunting movement was the German track engineer Klingel. After Klingel used Engineering Mathematics to derive the hunting movement cycle distance LK, few people actually verified the actual hunting movement data. Fewer people have verified the hunting movement in the bogie. In order to find the hunting movement cycle distance closer to the actual axle, the laboratory designed and manufactured a single-axle rolling test rig.

This research used six single-point laser displacement measurements to measure hunting movement. And develop two different methods to accurately obtain the hunting movement frequency.This frequency is twice the frequency proposed by Klingel, so the constraint conditions are changed to observe the change. This experiment found that changing the constraint conditions does not affect the hunting movement frequency of this machine, but it will affect the hunting movement amplitude.

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