基于载荷谱架构和实测动应力的构架载荷谱建立方法OA

Aiming at the problem that the traditional method for establishing load spectrum of bogie frame relies on large-scale measured load data,this paper proposes a load spectrum establishment method based on load spectrum architecture and measured dynamic stresses.Firstly,based on the analysis of the load system composition of the bogie frame,the loads on the bogie frame under typical lines are measured using an instrumented force-measuring bogie frame,along with the dynamic stresses of the bogie frame under long-term and wide-area service conditions.Secondly,the correlation coefficient is used to quantitatively characterize the correlation between measured loads,and a phase loading method matching the correlation is designed to establish a load spectrum architecture covering three core elements:load phase,load frequency,and load amplitude.Finally,based on the calculated actual service damage of the bogie frame and the damage predicted by the load spectrum,a damage-consistent calibration of the load spectrum is performed.The calibrated load amplitude is obtained through a calibration coefficient,thereby establishing a damage-consistent load spectrum suitable for quantitative fatigue life assessment.The results show that the load spectrum obtained by this method can accurately reproduce the actual service damage of the bogie frame,with a deviation from the actual equivalent stress amplitude of less than 12％,indicating that the proposed load spectrum establishment method is reasonable and feasible.This method can effectively reduce reliance on large-scale measured load data,shorten the load spectrum development cycle,and is suitable for quantitative fatigue life assessment of the bogie frame.