Abstract
ABSTRACT The vibration characteristics of a wheelset-gearbox-bogie frame system are studied under wheel-roller roughness and varying track irregularities utilizing a full-scale rolling test rig. A corresponding dynamic model is developed based on the discrete time transfer matrix method, which integrates a modular flexible wheelset model. The results reveal that, (1) low-frequency vibrations (0–50 Hz): dominated by track irregularities below 200 km/h but by wheel-roller rotation above 350 km/h; (2) mid-frequency vibrations (50–500 Hz): prominent shock effects appear at discrete frequencies above 350 km/h, related to wheel-roller roughness; (3) high-frequency vibrations (500–1000 Hz): great differences under various irregularities and distinguishing structural natural frequencies becomes difficult. Amplitude contributions at speeds below 200 km/h are mid (57–62%), low (26–32%), and high (11–14%). Above 350 km/h, mid-frequency increases while low-frequency decreases by 15%, respectively. To improve vibration performance at superspeed (e.g., 500 km/h), stricter wheel-rail roughness control becomes imperative.
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