Acoustic Black Holes in components for mobile applications realized by optimal material alignments

通过最佳材料排列实现移动应用组件中的声学黑洞

• 批准号: 315007155
• 负责人: Professorin Dr.-Ing. Sabine C. Langer
• 金额: --
• 依托单位: Institut für Akustik und Dynamik
• 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 2023-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/315007155?language=en
• 关键词: Acoustic; Black; Holes; components; mobile

The preparation of a structure in early design stages for upcoming passive damping measures would highly increase the damping effect and decrease costs. More effective damping can be reached by an improvement of the local damper or a modification of wave propagation in the underlying structure. Ideally, those measures should merge in one method. Acoustic black holes are local passive damping systems with an high potential. Artificially created indentations lead to a 'trapping' of waves, a reduction of wave speeds and a raise of amplitudes which represents an optimal damping position. The main advantage, which defines acoustic black holes as smart, is a reduction of weight in parallel with a reduction of noise emission. This fact may lessen the conflict between lightweight design and acoustic quality. The full potential of acoustic black holes can only be exploited with a structural integration in early design phases. The impact of a preparation of the underlying structure on localised damping systems is assumed to be crucial and has not been investigated yet. Major objectives of this proposal are two methods concerning the positioning of acoustic black holes within a structure and the integration of acoustic black holes. The latter point is realised by structural modifications leading to a modified wave propagation: The structure-borne energy shall be led to the localised damping treatment in order to exploit acoustic black holes more efficiently. The encompassing and concluding objective of this project is the conflation of these findings regarding positioning and integration. The resulting method will help engineers to consider acoustic black holes in early design phases and to develop a highly efficient and economic calm structure.

在早期设计阶段为即将到来的被动阻尼措施准备结构将大大增加阻尼效果并降低成本。可以通过改进局部阻尼器或修改底层结构中的波传播来实现更有效的阻尼。理想情况下，这些措施应合并为一种方法。声学黑洞是一种具有高势能的局部被动阻尼系统。人为制造的凹痕会导致波浪的“捕获”、波速的降低和振幅的提高，这代表了最佳的阻尼位置。将声学黑洞定义为智能的主要优点是减少重量并减少噪音排放。这一事实可能会减少轻量化设计与声学质量之间的冲突。声学黑洞的全部潜力只能在早期设计阶段通过结构集成来开发。局部阻尼系统的基础结构的准备的影响被认为是至关重要的，还没有被调查。该提案的主要目标是两种方法，关于声学黑洞的结构内的定位和声学黑洞的整合。后一点是通过结构修改实现的，导致修改的波传播：结构承载的能量应被引导到局部阻尼处理，以更有效地利用声学黑洞。本项目的总括和结论性目标是将这些关于定位和整合的调查结果合并起来。由此产生的方法将有助于工程师在早期设计阶段考虑声学黑洞，并开发高效经济的平静结构。