On the modal damping abnormal variation mechanism for railway vehicles

Xia, Zhanghui, Zhou, Jinsong, Gong, Dao, Sun, Wenjing and Sun, Yu (2019) On the modal damping abnormal variation mechanism for railway vehicles. Mechanical Systems and Signal Processing, 122 (5), 256-272. (doi:10.1016/j.ymssp.2018.12.015).

Abstract

The wheel-rail contact intrinsic features aggravate the heavy-duty modal damping conditions of railway vehicle systems under velocity parametric excitation. Therefore, railway vehicles occasionally encounter with modal damping abnormal variation (MDAV), which seriously deteriorates their operation safety and riding comfort. To study the MDAV phenomenon of vehicle system under velocity parametric excitation, a continuous modal tracking method based on the Lagrange cubic spline interpolation is proposed. Utilizing this method, the MDAV phenomenon in four-wheeled vehicle bogie and typical railway vehicle is studied, then the MDAV occurrence criterion is proposed based on the modal shape similarity. It is found that the root causes of MDAV phenomenon is not related to the framework or car body resonance instability resulting from the intersection of wheelset and framework or car body modal frequency curves under velocity parametric excitation, but the modal shear interchange between wheelset mode and that of framework or car body, with the veering behavior of frequency curves. Also, the MDAV occurrence is quite effectively predicted by the proposed criterion based on the modal shape similarity

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