Interior Noise Prediction of High-Speed Train Based on Hybrid FE-SEA Method

Interior noise in rolling stock is an important index in the evaluation of passenger ride comfort. In this paper, the hybrid FE-SEA method was used to predict the interior noise of high-speed trains. In this process, the hybrid model of the car body was established based on FE models. Then according to the characteristic of the car body, the beams and stiffeners were described by a FE subsystem and thin, light plates and panels were divided into a SEA subsystem. As for the special structure of hollow aluminium alloy extrusion which makes up the car body profile, the equivalent model of a General Laminate was proposed to simplify this structure in the paper. Through theoretical calculation and test, subsystem parameters and external excitations were obtained, and then imported into the prediction model. Finally noise at the central section of the high-speed train was predicted by using the hybrid FE-SEA model. Compared with the test results, in the frequency range of 100 similar to 1000 Hz, the predicted and test noise spectra followed basically the same trend, so the proposed Hybrid FE-SEA method can be efficiently applied to the railway field.