Research On Experimental Modal Analysis Of Body And Bogie Of Heavy Axle-load HX_D2F Locomotive

The locomotive body and bogie are very important structures on the train, they will be subjected to various loads and shocks when the train is running, these factors make them in a state of vibration. For the heavy axle-load locomotives, it is probable that the body and bogie easily stated in coupled vibration. As is known to all, the performance of locomotive body and bogie may influence the quality of the whole train, so it demands them not only to meet the requirements of static strength, but also to ensure that they have a good dynamic performance in the process of operation. Because most researches are limited to the body itself, but ignoring the influence of bogie, so the evaluation on dynamic characteristics of train has many uncertainty factors. As the low frequency characteristics of heavy axle-load HXD2F locomotive, the body and bogie are easily stated in coupled vibration. To exclude the possible of coupling vibration, we should analyze the body and bogie comprehensively so as to make dynamic characteristics evaluation for the whole train and provide suggestion for FEM.For heavy axle-load locomotive, modal analysis technology and testing method are important methods to study the dynamic performance of body and bogie. To get the modal parameters, this paper adopted experimental modal analysis and done different modal testing; based on the modal parameters, we analyzed the dynamic characteristics of the body and bogie and the possibility of coupling vibration. The specific research contents are as follows:(1) Compare the advantages and disadvantages of different methods of parameter identification, the best modal identification methods are chosen to improve the accuracy of parameters.(2) Build the testing system, and based on the structure of locomotive body and bogie to design testing model in different states, and determine the appropriate sensor layout for different modal testing.(3) EMA method is adopted to analyze the freedom state of bogie, and comparing the modal parameters with the FEM results to ensure the designing consistency, and make preparation for dynamic characteristics evaluation of whole train.(4) OMA method is adopted to analyze the preparation state of body and bogie, According to the modal parameters to analyze the dynamic characteristic of locomotive body. Reference the standard to analyze the coupling vibration of body and bogie, so that evaluate the dynamic characteristics of the whole locomotive body comprehensively. The FEM is modified by the analysis results, and provide reference for the initial locomotive body and bogie design.(5) Through the modal test of locomotive body and bogie, conclude a modal analysis method for the important components of Heavy axle-load locomotive. Analyze the relationship between the locomotive body and bogie and overall dynamic characteristics based on the identified modal parameters.