Abstract: Sound pressure and sound intensity methods were used to measure the Transmission Loss (TL) of silent floor of high-speed train. Results of the two methods are in good agreement that the difference is within a reasonable range of engineering error, which avoid experiment muff. The results also provide certain reliability for subsequent simulation verification. It is shown that the sound insulation effect of silent floor is better than that of general floor. The damping loss factor was measured by pulse attenuation method, which was then used to calculate the TL using FE-SEA hybrid method. The calculation results of TL are in good agreement with the experiment results. Better sound insulation structure can be obtained by adjusting the thickness of plywood and the rubber layer. It is shown that when the thickness of the rubber layer is 2 mm and three layers of plywood have different thickness of 3 mm, 5 mm and 7 mm respectively, the silent floor has better sound insulation performance. The sound insulation performance of the silent floor can be optimized by improving the floor structure and the sound package, to establish the users' database.

Key words: vehicle engineering, railway vehicle, vehicle sound insulation performance, sound pressure method, sound intensity method, silent floor, finite element-statistical energy analysis hybrid method, user database