摘要
降低轮轨噪音的有效方法之一是增加钢轨阻尼,增加钢轨阻尼能抑制钢轨振动,进而降低钢轨辐射噪音。基于此,提出一种带槽扩展层静音钢轨。与传统静音钢轨不同,在钢轨和阻尼层之间增加一层带槽扩展层。它可以扩大阻尼层剪切变形,从而很大程度提高阻尼层耗能能力。通过大量数值仿真实验得出该结构最佳材料参数和结构参数组合,并制作出其实物原型,进行实验测试。测试结果表明:带槽扩展层约束静音钢轨在垂向激励下噪声声辐射声压级能降低8.2dB(A),横向激励下噪声声辐射声压级能降低9.4dB(A)。
A promising means to reduce the components of railway rolling noises radiated by tracks is to increase the damping of the rails. This decreases the vibrations of the rails and thereby reduces the noises radiated. To achieve this, a silent rail with a slotted stand-off layer has been designed. The efficiency of the conventional constrained silent rail can be improved drastically by adding the slotted stand-off-layer （SOL） between the vis- coelastic layer and the rail. It increases the viscoelastic strain so that more energy is dissipated via the viscoelas- tic layer. Suitable material and structure parameters have been found from extensive numeric tests. The proto- type of it has been built and tested in the laboratory. Results are very promising with reductions of the acoustic radiation pressure level of rail noises to 8.2 dB （A） by vertical excitation and to 9.4 dB （A） by lateral excita- tion.
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2013年第1期80-86,共7页
Journal of the China Railway Society
关键词
轮轨噪声
阻尼
振动
带槽扩展层
静音钢轨
wheel/rail noise
damping
vibration
slotted stand-off-layer
silent rail
