Equivalence study on hollow extruded aluminum alloy profile plates based on vibroacoustic behavior

For noise simulation of a high-speed train passenger compartment, an equivalence study of vehicle body hollowaluminumprofiles is imperative for reducing the finite element calculation in the simulation process and adapting to the requirements of statistical energy analysis. From the perspective of structural vibration and acoustic radiation, hollow aluminum flooring was used as an example. This study provides a noise-, vibration-, harshness-(NVH) equivalent plate acquisition method for hollow profiles and plates and studies the engineering application conditions and deviations of the equivalent structure. In accordance with the NVH-equivalent method for hollow profiles, a basic process is furnished for acquiring the properties and parameters of the equivalent plate. The consistency of vibration and noise insulation between the equivalent plate and hollow profiles plate has been validated through simulation. An electric multiple unit (EMU) interior noise simulation example showed that for an interior noise simulation model using equivalent plates, the prediction accuracy of interior noise can meet the requirements of engineering applications while significantly reducing the simulation time.