高速铁路沥青混凝土轨下基础振动噪声性能评估

为比较不同轨下基础噪声水平,通过ABAQUS建立声-固耦合模型,模拟结构振动产生的声场中的噪声变化.选取声场中的声压值转化得到的声压级值作为定量评价两种沥青混凝土轨下基础(ACRS-1型、ACRS-2型)和普通板式(SlabTrack)结构产生的噪声水平.结果表明,选用的声-固耦合模型可以较好地评估不同轨下基础下噪声.比较3种轨下基础结构可以发现,总体上, ACRS-1型和ACRS-2型结构要比普通板式结构的噪声要低,特别是ACRS-2型结构,比其他两种结构的噪声均要低.噪声降低的幅值出现在0.01、0.02、0.03 s附近,尤其在0.02 s附近, ACRS-2型结构低于普通板式结构的噪声幅值10~20 dB, ACRS-1型结构低于普通板式结构的噪声幅值5 dB左右. 

Acoustic Performance of Asphalt Concrete Underlayment for High-Speed Railway Substructures

To compare the rail noise levels with different substructures, a sound-solid coupling model was established using FEM-based ABAQUS software to simulate noise changes in the sound field generated from structural vibration. Sound pressure values were selected from the sound field and transformed to sound pressure levels for quantitative evaluation of noise levels of two asphalt concrete underlayments (ACRS-1 type and ACRS-2 type) and an ordinary slab track structure. The results show that the sound-solid coupling model can successfully evaluate different rail noise levels. Comparison of the above three kinds of track infrastructures indicates that the noise levels of the ACRS-1 and ACRS-2 type structures are generally lower than that of the slab track structure; especially, the noise level of the ACRS-2 structure is lower than the noise levels of the other two structures. Moreover, noise reduction amplitude occurs in 0.01 s, 0.02 s and near 0.03 s, particularly in the vicinity of 0.02 s. The noise amplitude of the ACRS-2 type structure is 10-20 dB lower than the ordinary slab track structure, whereas the noise amplitude of the ACRS-1 type structure is 5 dB lower than that of the ordinary slab track structure.