Study On The Load Identification Method And Experiment For CIT380B-002EMU Motor Bogie Frame

With the improvement in operating speed, the ranges of line perturbations frequency on high-speed railway bogie frame widen, so natural frequency of elastic vibration-induced of frame could be close to the line perturbations frequency. It means that there is a dynamic relationship between load and stress in the normal working conditions; In the meantime, the traditional load identification methods can not overcome the nonlinear problem, posing a challenge on the traditional load identification methods; For the gear and braking loads, there is no direct and continuous testing method. Therefore, studying the new load identification methods which test the loads precisely are in great demand.This paper is based on the CIT380B-002EMU, including the following aspects:1. The geometry and finite element model of the motor bogie were set up;2. Reasonable schemes were proposed according to simulating results, including positions of the measuring points and bridging form of strain gauge;3. The demarcation experiment for the force bogie and force sensors were made, decoupling among load-bridges was carried out;4. Using the two testing methods, data was tested when the EMU running on the passenger special line between Guangzhou and Shenzhen; Load spectrums were constructed and compared according to the test data.The research has successfully created the force test bogie for CIT380B-002EMU, which has been used on the line. It is a great breakthrough for the load identification and a beneficial try for the standardized load spectrum of the high-speed railway.