| 徐海博,吴波波,司义德,刘忠远,李蕾.软质面层抑制高阶模态降低地板结构撞击声研究[J].声学技术,2023,42(4):503~508 |
| 软质面层抑制高阶模态降低地板结构撞击声研究 |
| Research on soft surface layer suppressing high-order modes to reduce the impact noise of floor structure |
| 投稿时间：2021-11-29 修订日期：2022-01-22 |
| DOI：10.16300/j.cnki.1000-3630.2023.04.014 |
| 中文关键词: 撞击声 模态叠加 软质面层 高阶模态抑制 |
| 英文关键词: impact noise mode superposition soft surface layer high-order modal suppression |
| 基金项目:中科院声学所青年英才项目(QNYC201819)。 |
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| 中文摘要: |
| 为了研究并降低地板结构受到激励时产生的撞击声响应，利用振动模态叠加思想，将地板结构受到激励时空间中一点接收到的声信号表示为各阶振动模态的叠加，若某一阶振动模态受到抑制或不被激发则可降低、消除对应频率处的辐射噪声。通过在结构表面铺设软质面层并用标准撞击器激励的方法进行实验研究，结果表明，通过在地板结构表面引入软质面层的方法，可以有效降低地板结构的规范化撞击声压级，因为随着频率的增加，当激励力不足以激发高阶模态时，地板结构不辐射对应频率处的噪声，由此可以达到降噪的目的。 |
| 英文摘要: |
| In order to study and reduce the impact noise generated while hitting floor structure, the idea expressing the impact noise received at a point in the space as the superposition of all orders of vibration modes is used. If a certain vibration mode is suppressed or not excited, the radiation noise at the corresponding frequency can be reduced and eliminated. The experimental study is carried out by laying a soft surface layer on the surface of floor structure and hitting it with a standard impactor, and the results show that the normalized impact noise level can be effectively reduced. This is because when the excitation force is insufficient to excite higher-order vibration modes with increasing frequency, the floor structure does not radiate the impact noise corresponding to the model frequency, therefore the purpose of noise reduction can be achieved. |
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