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

在早期设计阶段为即将到来的被动减振措施准备结构将极大地提高减振效果并降低成本。通过改进局部阻尼器或改变底层结构中的波传播，可以达到更有效的减振效果。理想情况下，这些措施应该合并为一种方法。声学黑洞是一种极具潜力的局域被动减振系统。人为造成的凹陷会导致波的“陷落”、波速的降低和振幅的提高，这代表了最佳的减振位置。声学黑洞的主要优势是在减少噪音排放的同时减轻了重量。这一事实可能会减少轻量化设计和音质之间的冲突。声学黑洞的全部潜力只能通过在早期设计阶段的结构集成来开发。基础结构的准备对局部减振系统的影响被认为是至关重要的，目前还没有进行过研究。这项提议的主要目标是关于在一个结构内定位声学黑洞和整合声学黑洞的两种方法。后一点是通过结构修改实现的，从而导致波传播的修改：应将结构携带的能量引入局部阻尼处理，以便更有效地利用声学黑洞。该项目的包罗万象和最终目标是将这些关于定位和整合的调查结果合并在一起。由此产生的方法将帮助工程师在早期设计阶段考虑声学黑洞，并开发出高效和经济的平静结构。

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.