Instabilities in highly deformable systems: unique opportunities for control of flow and vibrations

高变形系统的不稳定性：控制流动和振动的独特机会

• 批准号: 267742614
• 负责人: Dr.-Ing. Patrick Kurzeja
• 金额: --
• 依托单位: Institut für Mechanik (IM)
• 依托单位国家: 德国
• 项目类别: Research Fellowships
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/267742614?language=en
• 关键词: Instabilities; highly; deformable; systems; unique

A novel class of active devices with tuned instabilities is emerging from the exciting field of compliant structures for the design of actuators, adaptive systems, and self-regulating fluidics. Yet, available characterization techniques are restricted to conventional materials and promising functionalities remain to be explored. This research project at the research group of K. Bertoldi (Harvard University) aims at exploiting latest research on non-linear structures to sharpen our understanding and scientific classification of modern materials and to extend the application areas of tuned instabilities in various environments.In subproject I, the dynamic processes in fluid-filled, highly deformable structures are simulated and related to geometric and material properties. The unique opportunity of reversible, drastic compaction allows to cover soft structures, compact materials, and hybrids in between. This unifying approach extends conventional characterization techniques (e.g. nondestructive parameter identification, prediction of critical frequencies) to novel structures.In subproject II, non-linear resonators are embedded in strain-controlled buckling cells. The spectral richness of local resonators is regulated by the buckling of the deployable cell structure, yielding a new functional meta-material with various tunable attenuation regimes. Numerical and experimental tests of the most promising geometries will prove the robustness and applicability for an optimized design.

一类新型的具有调节不稳定性的活跃设备正在从令人兴奋的符合性结构的领域，用于执行器，自适应系统和自我调节流体的设计。然而，可用的表征技术仅限于常规材料，并且有前途的功能仍有待探索。 K. Bertoldi（哈佛大学）研究小组的研究项目旨在利用有关非线性结构的最新研究，以增强我们对现代材料的理解和科学分类，并扩展各种环境中调谐不稳定性的应用领域。可逆性，剧烈压实的独特机会涵盖了介于两者之间的软结构，紧凑的材料和杂种。这种统一的方法将常规表征技术（例如非破坏性参数识别，临界频率预测）扩展到新结构。局部谐振器的光谱丰富度受可部署的细胞结构的屈曲而调节，从而产生了具有各种可调衰减状态的新功能元物质。最有希望的几何形状的数值和实验测试将证明对优化设计的鲁棒性和适用性。

项目成果

Oscillatory fluid flow in deformable tubes: Implications for pore-scale hydromechanics from comparing experimental observations with theoretical predictions.

• DOI: 10.1121/1.4971365
• 发表时间: 2016-12
• 期刊: The Journal of the Acoustical Society of America
• 作者: P. Kurzeja;H. Steeb;M. A. Strutz;J. Renner

The criterion of subscale sufficiency and its application to the relationship between static capillary pressure, saturation and interfacial areas

子尺度充分性准则及其在静态毛细管压力、饱和度和界面面积关系中的应用

• DOI: 10.1098/rspa.2015.0869
• 发表时间: 2016
• 期刊: Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
• 作者: P. Kurzeja