Adhesion and Dynamic Phenomena during Slippage of Electrical Rolling Stock : 3rd Report: Self-excited Vibration during Slippage of Electric Locomotive Trucks

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When the driving axles of an electric locomotive slip, self-excited vibration will occasionally occur in its trucks. To suppress such selfexcited vibration, detailed theoretical calculations of the vibrations during slippage of typical trucks were made and stability criteria were sought by simplifying the system. (1) Theoretical expressions were derived for the vibrations during slippage of typical trucks, that is, individual quill spring drive type trucks, and individual axle-hung motor type trucks, and numerical calculations regarding actual examples were made. The calculated and observed results generally agree with each other, revealing that the behavior of trucks can be predicted through theoretical calculations. (2) Stability criteria were sought for several problematical mode of vibration, that is, the torsional vibration of both individual and monomotor driving systems and the pitching of an axle-hung motor about the axle. The validity of the stability criteria was proved by comparing them with actual examples, and some instances of success in suppressing self-exited vibration were disclosed.
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