Objective High-speed vehicles adopt lightweight design, and their single axle independent wheelset bogies feature short axles, low unsprung mass, and reduced wheel-rail impact. However, independent wheelset vehicles lack inherent self-guiding capability, which affects vehicle stability and curve-passing performance. To further optimize vehicle performance, it is necessary to conduct research on the guidance control of high-speed vehicles equipped with single-axle independent wheelset bogies.

Method Based on multibody dynamics theory, dynamics models for the single-axle independent wheelset bogie and the high-speed vehicle using independent wheelsets are established, and the vehicle running stability and curve-passing performance are evaluated. Using differential-speed guidance theory, a PID (proportional-integral-differential) control strategy is employed to build a guidance control module, and the straight-line guiding performance and different curve-passing performance are studied for the independent wheelset high-speed vehicle under active guidance control.

Result & Conclusion  The straight-line stability and curve-passing performance of the high-speed vehicle equipped with new single-axle independent wheelset bogie all meet the required standards. Under the guidance control strategy, each wheelset of the vehicle exhibits good centering performance in straight-line conditions; in curve conditions with a radius of 7 000 m, effective guidance control is achieved, and the wear index, derailment coefficient, and wheel-load reduction rate are all improved. In curve conditions with a radius of 300 m, although the rotational speed difference of each wheelset can be effectively controlled, the optimization effectiveness of curve-passing performance remains limited due to the relatively large axle distance.