基于混合有限元-统计能量分析的箱梁结构噪声特性分析*

为了探讨箱梁的结构噪声辐射规律,提高计算精度及效率,基于混合有限元-统计能量分析理论,建立1/10箱梁有限元-统计能量分析计算模型,并进行模态实验与声学实验验证。在此基础上进行声贡献量以及振动传递规律分析,并与相关文献进行比较。研究结果表明:混合有限元-统计能量分析模型不仅适用于箱梁结构噪声分析,而且在保证计算精度的同时提高了计算效率;在随机激励下,箱梁顶板和左右翼板的声贡献量高达87.3%,底板和腹板的声贡献量仅为13.7%;箱梁结构各子系统声贡献量规律与箱梁结构各子系统的振动大小规律保持一致。

Noise analysis of box girder structure based on hybrid finite element-statistical energy analysis

In order to discuss the structural noise radiation law of the box girder and improve the calculation efficiency, based on the hybrid FE-SEA (Finite Element-Statistical Energy Analysis) theory, a 1/10 box girder FE-SEA calculation model was established, and modal experiments and acoustic experiments were conducted to verify. On this basis, the analysis of the sound contribution and vibration transmission law was carried out, and compared with relevant literature. The research results show that the hybrid FE-SEA model is not only suitable for noise analysis of box girder structures, but also has high calculation efficiency. Under random excitation, the acoustic contribution of the box girder top plate and left and right wing plates is as high as 87.3%, and that of the bottom plate and web is only 13.7%. The vibration law of each subsystem of the box girder is consistent with the sound contribution law of each plate of the box girder.