Deliberate introduction of acoustic radiation damping using locally resonant materials

使用局部谐振材料有意引入声辐射阻尼

• 批准号: 314928016
• 负责人: Professor Dr.-Ing. Steffen Marburg
• 金额: --
• 依托单位: Gerhard-Zeidler-Stiftungslehrstuhl für Akustik mobiler Systeme
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/314928016?language=en
• 关键词: Deliberate; introduction; acoustic; radiation; damping

Many lightweight structures are stiff and weakly damped. This observation holds for a number of musical instruments and some submerged structures too. These structures have in common that acoustic radiation damping may be of a similar or even higher magnitude than other damping mechanisms. This proposal is directed to investigate such cases and to provide mathematical formulations which allow to consider acoustic radiation damping in a purely structural model although the actual physics would require a coupled structural acoustic model. However, mathematically, the structural acoustic model can be reduced to a structural one where the Schur complement represents the entire fluid behavior. This project investigates acoustic radiation damping quantitatively and aims at the development of a mathematical model to consider acoustic radiation damping without solution of the acoustic radiation problem. Beside the actual radiation damping, the quantitative estimation includes investigation of numerical damping occurring in acoustic BEM formulations and fluid damping which may become relevant at high frequencies. The uncoupled structural model may consider radiation damping either as a modal damping or as a viscoelastic bedding. Finally, structures which utilize acoustic radiation damping will be developed and investigated.

许多轻型结构是刚性的，阻尼很弱。这一观察也适用于一些乐器和一些水下结构。这些结构的共同之处在于，声辐射阻尼可以具有与其他阻尼机构相似或甚至更高的幅度。这个建议是针对调查这种情况下，并提供数学公式，允许考虑声辐射阻尼在一个纯粹的结构模型，虽然实际的物理将需要一个耦合的结构声学模型。然而，在数学上，结构声学模型可以简化为结构模型，其中舒尔补表示整个流体行为。本计画针对声辐射阻尼进行定量研究，并在不解决声辐射问题的情况下，发展一个考虑声辐射阻尼的数学模型。除了实际的辐射阻尼，定量估计包括调查的数值阻尼发生在声学边界元公式和流体阻尼可能成为相关的高频。非耦合结构模型可将辐射阻尼视为模态阻尼或粘弹性垫层。最后，将开发和研究利用声辐射阻尼的结构。