Abstract: In order to design a kind of composite material with excellent sound insulation performance for rail vehicles and other transportation vehicles, the autoclave process was employed to prepare this composite material with a sandwich structure laminates. Performance of sound insulation of this composite structure was effectively controlled with a design of the laminated structure, thickness and damping layer. The results show that the sound insulation performance can be effectively improved with an increase in thickness and density of composite materials. The utilization of a damping layer makes the impedance mismatch at the internal interface of the composite structure, which results in that the sound waves are easily reflected at the interface, and the increase in sound energy further step consumption effectively improves the sound insulation performance either. With the structural design, the weight of the composite material was not only reduced but the sound insulation performance was improved. Finally, it makes this composite laminated structure material meet the sound insulation requirements of the high-end transportation field.

Key words: rail transit vehicle, composite laminates, sound insulation, structural optimization