Effect of evaluation methods on vibration comfort evaluation results of high-speed trains under wind shear
Scientific and reasonable evaluation of ride comfort is crucial to improving the operating performance of high-speed trains in windy areas.This study was conducted to address new issues discovered in special tests under strong winds.There was a significant difference between the evaluation results of existing stability indicators and the actual feelings of drivers and passengers under wind shear,indicating that there are limitations in the application of existing comfort indicators.First,the existing different vibration comfort evaluation methods such as the Sperling index,ISO-2631,EN-12999,UIC-513,and GB-5599 were systematically sorted out and theoretically compared to evaluate the differences.Secondly,combined with the requirements of different evaluation methods,six-degree-of-freedom train-seat-human body coupling model was established through the multi-body dynamics method and the human body dynamics parameter model,which can integrally describe the influence of the car body and human body dynamics.On this basis,the measured train aerodynamic load under wind shear was further used as input excitation,and the impact of the existing comfort index evaluation process and frequency weighting curve on the evaluation results under the action of the real aerodynamic load was analyzed,revealing the reasons for differences in the evaluation results.Finally,based on the existing vibration comfort evaluation methods,suggestions and supplements are made for the evaluation of vibration comfort of high-speed trains under wind shear from three aspects:index parameters,measurement point locations,and evaluation process.The results show that due to the different frequency weighting curves and different forms of consideration of vibration in various directions,different evaluation methods have differences in the emphasis on human body-sensitive frequencies and the weight of vibration forms.It is recommended that the evaluation method of vibration comfort under wind shear include roll angular velocity and angular acceleration and increase the corresponding measurement point positions.At the same time,the rotational vibration amplitude can reflect the impact of rotational vibration on vibration comfort under wind shear.
万方数据
维普
