Performance Limits of Rail Passenger Vehicles: Evaluation and Optimization

摘要

The dynamic performance capability of conventional and radial passenger trucks is identified and optimized with respect to ride quality, stability, and curve negotiation. This report defines, in an engineering sense, the performance boundaries of conventional and radial truck designs to provide guidelines for the evaluation of existing and proposed equipment. Linear dynamic models are developed that are capable of evaluating vertical response of a flexible carbody to random track irregularities, lateral hunting stability, lateral response to random track irregularities, and steady state lateral curve negotiation. The parametric results are presented in the form of charts and histograms which strongly indicate that the dynamic performance is sensitive to primary and secondary suspension parameter selection and that clear performance trade-offs exist including those between ride quality and stroke requirements and lateral stability and curving performance. The radial truck design allows an improved trade-off relationship by permitting the primary suspension to be designed for curve negotiation while maintaining stability through the radial links.