板厚和加肋对槽型梁结构噪声的影响

Influence of deck thickness and stiffeners on structure-borne noise of the trough beams

考虑车辆、轨道和桥梁动力相互作用,用模态叠加法分析了槽型梁的结构噪声和不同构件的声压贡献量。分析表明:槽型梁底板对远场区结构噪声的影响大于腹板,增加底板厚度的降噪效果好于增加腹板厚度;设置横肋也能有效降低远场区和梁底结构噪声,横肋全跨布置比仅在跨中加密布置效果好;车速高时增设横肋的降噪效果好于车速低时。

Considering dynamic interactions of the vehicle-track-bridge mode superposition method is applied to compute the structure-borne noise of the trough beam and the acoustic contributions of different components of the beam. Results show that the effect of the bottom deck is larger than that of the webs for the noise levels at far field. The structure-borne noise at beam bottom can be much reduced by increasing the thickness of the bottom deck, but less reduced by increasing web thickness. Another method to reduce the noise at the far field and beam bottom is to set lateral stiffeners evenly on the beam, and this method for reducing structure-borne noise is more effective under higher train speeds.