The noise reduction performance of straight noise barriers for high-speed railway is investigated numerically. A two-dimensional model with boundary element method is established to predict the insertion loss of straight-type noise barriers mounted on a bridge. The effective line sources which are synthesized using the noise sources of high-speed train obtained by the noise source identification system are located at the outside surface of the train to radiate sound waves in the model. Noise field outside the train with and without noise barriers are calculated. The numerical model is validated by comparing the simulation and experimental results at the measure points. The performance of noise reduction of the barriers at varying running speeds is investigated. Insertion loss for the noise from the sources in different regions are calculated separately.
展开▼
