梁板组合结构的中频振动试验与计算分析

Tests and simulation for vibration in mid-frequency domain of a beam-plate built-up structure

针对梁板组合结构的中频振动问题,在混响实验室中进行某一典型梁板组合结构的声振试验,对试验获取的梁和板的加速度响应进行了分析,基于H-混合模型法建立了有限元-统计能量(FE-SEA)混合模型,通过模态试验对模型进行了验证。对混合模型计算的结果进行了分析,并与试验结果进行了对比。得到了内外声场之间通过板结构进行非共振传递和共振传递的声传递规律。FE-SEA混合模型计算与试验结果吻合,验证了使用H-混合模型方法进行中频振动分析的有效性和可靠性。

To investigate vibration problems of beam-plate built-up structure in mid-frequency domain,vibroacoustic tests were performed in a reverberation lab. The measured acceleration responses of the structure were analyzed to establish a hybrid FE-SEA model. The hybrid FE-SEA model＇s simulation results agreed well with test ones. The nonresonant and resonant sound transmission rules between external acoustic field and internal one through the structure were then deduced. The results showed that the hybrid FE-SEA model is reliable and effective for vibration analysis in midfrequency domain of a beam-plate built-up structure.