CAJ | 학술논문

嵌入式轨道是一种普遍用于城市轨道交通减振降噪的轨道结构，该种轨道的钢轨埋置在高分子弹性材料中，只有轨头露出表面，所以高分子弹性材料是嵌入式轨道结构起到减振降噪作用的重要部分。利用轮轨滚动声辐射理论和有限元—边界元法，建立嵌入式轨道模型，调查高分子弹性材料弹性模量对嵌入式轨道结构振动声辐射的影响。在轮轨激励作用下，计算轨道结构的振动和声辐射响应，分析轨道结构辐射噪声的频谱规律。通过改变弹性材料的弹性模量，对比轨道结构振动沿纵向的衰减效果和沿横向的衰减效果，分析高分子弹性材料弹性模量对轨道结构减振特性的影响。
감입식궤도시일충보편용우성시궤도교통감진강조적궤도결구，해충궤도적강궤매치재고분자탄성재료중，지유궤두로출표면，소이고분자탄성재료시감입식궤도결구기도감진강조작용적중요부분。이용륜궤곤동성복사이론화유한원—변계원법，건립감입식궤도모형，조사고분자탄성재료탄성모량대감입식궤도결구진동성복사적영향。재륜궤격려작용하，계산궤도결구적진동화성복사향응，분석궤도결구복사조성적빈보규률。통과개변탄성재료적탄성모량，대비궤도결구진동연종향적쇠감효과화연횡향적쇠감효과，분석고분자탄성재료탄성모량대궤도결구감진특성적영향。
Embedded track, due to its best vibration-noise reduction effect, is widely used in urban rail transit. Its rails are embedded in the polymer elastic material with only rail heads appearing above the surface. Thus, property of the polymer elastic material plays an important role in the vibration-noise reduction of the embedded track structure. Based on the theory of wheel/rail rolling noise radiation, a FEM-BEM model was established for the embedded track. The influence of the elastic modulus of the polymer on the acoustic radiation of the track structure was investigated. Under the wheel/rail excitation, the vibration and acoustic radiation response of the track was calculated, and its radiation noise spectrum distribution was obtained. By changing the elastic modulus of the polymer, the longitudinal and transverse vibration attenuation effects of the track structure were analyzed and compared. The influence of the elastic modulus of the polymer on the vibration characteristics of the track structure was analyzed.