机械激励下的板件声学包装中频段插入损失研究

提出了一种混合FE-SEA模型用于预测机械激励下声学包装的中频段插入损失，与验证试验进行对比，其准确性得到了验证。基于此模型，通过改变两种典型的声学包装的设计参数，得到了其插入损失随设计参数变化的规律，即决定插入损失峰谷值频率特性的敏感要素是对整体模态特性影响最大的参数；最后给出结论，当机械激励下的结构声传播为主要传播路径时，板件应选择覆盖层为均匀质量层的声学包装

Mid-frequency band IL of sound package under structure excitation

The hybrid FE-SEA model to predict insertion loss(IL) of sound package in mid-frequency band under structural excitation was proposed,and the model was proved to be of good prediction accuracy by comparing with the experiment results.Based on the model,parameters of sound package were modified and the relative IL was calculated.A law was presented that the parameters most sensitive to the frequency characteristics of IL dips were those which most affect the modal characteristics of whole structure.It is conculded that the most effective sound package applied to structure when the structure-borne sound is the main sound transmission path is the septum-backed carpet.