Abstract
It is known that good curving performance and stability often have conflicting requirements given a passive yaw stiffness of the wheelset. Using an active steering system, however, has the potential to realize improved curving performance with a satisfactory running stability. Relatively simple active control solutions of yaw relaxation and yaw compensation are illustrated and compared in this paper. In both control solutions, only low-cost electromechanical actuators and load cells are adopted for low-frequency actuations. Associated with a prototype of the two-axle vehicle, the dynamic performances of yaw relaxation and yaw compensation controls for different yaw stiffness configurations are simulated. The homogenous simulation results demonstrate excellent dynamic performance in curve negotiation and stability with the active steering strategies adopted.
Highlights
It is well known that a solid-axle wheelset has good passive steering capacity due to its conicity and its integrity of wheels and axle
Active steering strategies for yaw relaxation and yaw compensation methods are comprehensively compared in this paper
The focus is on the enhancement of the stability for the low yaw stiffness vehicle
Summary
It is well known that a solid-axle wheelset has good passive steering capacity due to its conicity and its integrity of wheels and axle. Using a high yaw stiffness can resist hunting motion but result in large wear and wheel/rail force during curve negotiation, since the steering of the wheelset is strongly constrained. The yaw relaxation approach utilizes the natural steering effect of a wheelset with a low yaw stiffness to negotiate a curve by releasing the internal steadystate loads of the electromechanical actuators.
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Schedule a callMore From: Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit
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