Based on the field test on carbody underframe rotational equipment of some high-speed railway vehicle, a flexible-rigid coupled model considering carbody elastic and unbalanced vibration of rotational equipment was established. Applied with two-stage suspension of underframe rotational equipment, the vibration performance of carbody and underframe suspended equipment is analyzed. Comparing the result of carbody complete finite element model, the substructure model and modal test, the elastic carbody in the dynamic model can reflect the reality of carbody vibration modal. The result shows that the two-stage suspension mode mainly reduces the carbody vibration caused by dynamic unbalance, while has little influence on the vibration of other frequencies. Compared with the one-stage suspension, the vibration amplitude is reduced by about half, and the effect of vibration reduction is obvious. In the two-stage suspension system, the frame mass, suspension frequency and damping ratio have obvious influence on the vibration of carbody and the equipment. The effect is more obvious by selecting reasonable suspension parameters. The structure of two-stage suspension is complex and is not suitable for all underframe rotational equipment. To meet the requirement of long-term service operation of some electrical components, the application of two-stage suspension on the rotational equipment can obtain good effect of vibration reduction.
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