Abstract
Being viewed from the standpoint of whole system, the hunting stability of a heavy-haul railway vehicle on a curved track is investigated in this paper. First, a model to simulate dynamic performance of the heavy-haul vehicle on the elastic track is developed. Secondly, the reason of the hunting motion is analyzed, and a bifurcation diagram for the vehicle on the curved track is put forward to simulate the nonlinear critical speed. Results show that the hunting motion of the heavy-haul vehicle will appear due to the larger conicity, the initial lateral shift and the wheelset angle of attack. With the hunting motion appearing, the lateral shift and force of the wheelset are changed sharply and periodically with a wave of circa 3.6 m. There is obvious difference in the bifurcation diagram between on a curved track and on a tangent track. Relative to the centerline of the track, each vehicle body on the curved track has two stable cycles. As for the curved track with a radius of 600 m and a superelevation of 55 mm, the nonlinear critical speed of the heavy-haul vehicle is 76.4 km/h.
Highlights
Developing heavy-haul railways is one efficient measure to increase the transport volume
Dukkipati [4] developed the mathematical linear models to determine the lateral stability or hunting of North American standard three-piece freight truck on track/roller stands, and the theoretical model results were compared with field test data performed by the Association of American Railroads (AAR)
1) Due to effects of various factors such as the large conicity, the excitation of the lateral shift and the wheelset angle of attack, the hunting motion appears when a heavy-haul vehicle negotiates a curved track at a low speed
Summary
Developing heavy-haul railways is one efficient measure to increase the transport volume. When a heavy-haul vehicle is negotiating these curved tracks with low speeds, the phenomenon of the hunting motion, usually taking place on the tangent track, will appear. In the using linear models, a comparative study on the dynamic stability and steady state curving behavior of some unconventional railway truck designs was carried out by Dukkipati [5]. Up to now, there is little study about the lateral stability of the heavy-haul vehicle on the curved track, let alone the stability research based on the coupled model between the vehicle and the track. Being viewed from the standpoint of the coupled system presented by Zhai et al [9,10], investigation efforts will be focused on the nonlinear hunting stability of the heavy-haul vehicle on the curved track in this paper. Dynamic gauge enlargement (mm) gram for the vehicle on curved track is put forward to simulate the nonlinear critical speed
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