正交试验下槽形梁桥瞬态噪声影响分析

为了探讨结构参数对桥梁结构噪声的影响,以某拟建轨道交通槽形梁为研究对象,选取桥梁支座刚度、桥梁阻尼比、桥梁结构刚度3个影响因素,结合有限元-瞬态边界元理论,对其进行正交分析。研究结果表明:轨道交通槽形梁结构瞬态辐射噪声对桥梁结构阻尼和结构刚度的改变较为敏感,随着桥梁结构阻尼参数和结构刚度系数的增大,声场最大线性声压级逐渐减小;在结构辐射噪声近声场处,桥梁结构刚度对槽形梁结构噪声影响较为显著;在结构辐射噪声远声场处,桥梁阻尼比对槽形梁结构噪声影响较为显著;应当有针对性地对桥梁结构噪声影响参数进行优化,从而改善桥梁结构噪声性能。

Analysis of Transient Structure Noise Influence on Trough Girder Bridge Based on Orthogonal Experiment

In order to investigate in the influence of structure parameters on the bridge structure noise,a planned rail trough girder is taken as the research object.Combined with the finite element transient boundary element theory,3 influential fac-tors:bridge bearing stiffness,bridge damping ratio and bridge structure stiffness are selected to make an orthogonal analysis. The results show that the transient radiation noise of rail trough girder structure is sensitive to bridge structural damping and structure stiffness changes,the pressure level of field maxi-mum linear sound decreases with the increase of bridge stiff-ness coefficient and structural damping parameters. Closer to the structural radiation noise field,the effect of the bridge structure stiffness on the trough girder will be more signifi-cant;while far away from the structural radiation noise field, the impact of bridge damping ratio on the trough girder struc-ture will become stronger. Therefore,it is necessary to opti-mize the noise impact parameters on bridge structure,so as to improve the noise performance.