Research on Modal Parameter Identification Method of Railway Carbody Based on 6-DOF Vibration Test Bench

In order to avoid the additional influence on the test results caused by the inconsistency between the boundary conditions of the carbody and the reality when using the vibration exciter or hammer to test the free mode of the carbody, a 6-DOF vibration test bench is tried to simulate the actual motion posture of the carbody to test its modal parameters. For in-depth discussion, a full-scale virtual prototype of the 6-DOF vibration test bench was built, and on this basis, the test bench-carbody rigidflexible coupling virtual test system was established. According to the modal frequency range of the carbody to be tested and the actual load capacity of the test bench, the excitation frequency and amplitude of the test bench are determined. Through the virtual modal test, it is determined that the carbody should be elastically supported when testing the modal parameters of the carbody by using the vibration test bench, so as to accurately obtain the modal parameters of the carbody.