As train running speeds increase,the vibration of thin-walled structures,such as EMU equipment compartment,become more pronounced.It is challenging for the load data measured over a short period of time and distance to accurately represent the maximum load boundary over the entire life cycle kilometrage,so it is necessary to predict the maximum value of load data over the entire life cycle kilometrage.This paper introduces a general process for predicting the maximum vibration load under high running speed conditions using a non-parametric extrapolation method.Taking the measured vertical vibration data of equipment compartment floor of high-speed EMUs as the research object,the variation law between floor vibration and train running speed is analyzed,and the maximum vibration value of EMU equipment compartment floor is predicted.The results indicate that the maximum vibration value of the equipment compartment floor has an approximately quadratic function relationship with the train running speed.Using the non-parametric extrapolation method based on the single-day test data,the 3-day maximum value can be predicted,with an error of less than 5％compared to the measure value.When the train operates at 450 km/h,the predicted value of the life cycle kilometrage using the non-parametric extrapolation method increases by 19％compared to the value obtained through direct prediction.In the design of higher-speed EMUs,using the predicted result from non-parametric extrapolation as the vibration load boundary provides a larger safety margin.
关键词
高速动车组/非参数外推/设备舱底板/全生命里程/振动
Key words
high speed EMU/non-parametric extrapolation/equipment compartment floor/life cycle kilometrage/vibration
维普
万方数据