With further increasing in running speed of newer high-speed EMUs (electric multiple units), higher demand for wheelset dynamic balance is required. In order to study the influence of the dynamic unbalance of wheelset on the stability, ride quality, and curving performance for a high-speed car, a detailed dynamic model of a high-speed EMU car is established using the software SIMPACK. The analysis results indicate that the dynamic unbalance of the wheelset significantly influences the dynamic performance of the high-speed car. The increase in dynamic unbalance of the wheelset will decrease the hunting critical speed, worsen the vertical ride quality, and increase the wheelset lateral force, derailment coefficient, and wheel unloading ratio. Therefore, in order to improve the stability, ride quality, and running safety of high-speed car, the values of dynamic unbalance of wheelset should be strictly controlled in manufacturing, and periodically monitored in operation.

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