Development of a model to assess acoustic treatments to reduce railway noise

13th International Conference on Motion and Vibration Control; 12th International Conference on Recent Advances in Structural Dynamics

Jeong, H.^1 ; Squicciarini, G.^1 ; Thompson, D.J.^1 ; Ryue, J.^2

Institute of Sound and Vibration Research, University of Southampton, Southampton

SO17 1BJ, United Kingdom^1

School of Naval Architect and Ocean Engineering, University of Ulsan, 93 Daehak-ro, Nam-gu, Ulsan, Korea, Republic of^2

关键词: Absorptive treatment;    Acoustic treatment;    Boundary element models;    Elastic properties;    Noise emissions;    Poroelastic materials;    Railway applications;    Resonance frequencies;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/744/1/012148/pdf
DOI  :  10.1088/1742-6596/744/1/012148

来源: IOP

【 摘 要 】

Porous materials have recently been used in absorptive treatments around railway tracks to reduce noise emissions. To investigate the effect of porous materials, a finite element model has been developed. 2D models for porous materials have been considered either as an equivalent fluid or as a poroelastic material based on the Biot theory. The two models have been validated and compared with each other to check the effect of the skeleton vibration. The poroelastic FE model has been coupled with a 2D acoustic boundary element model for use in railway applications. The results show that it may be necessary to include the frame vibration, especially at low frequencies where a frame resonance occurs. A method for the characterization of porous materials is also discussed. From this it is shown that the elastic properties of the material determine the resonance frequency and the magnitude.