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.

一类具有调谐不稳定性的新型有源器件正在从用于执行器、自适应系统和自调节流体设计的顺应结构的令人兴奋的领域中出现。然而，可用的表征技术仅限于传统材料，并且有希望的功能仍有待探索。 K. Bertoldi（哈佛大学）研究小组的这个研究项目旨在利用非线性结构的最新研究来加深我们对现代材料的理解和科学分类，并扩展调谐不稳定性在各种环境中的应用领域。 I，模拟充满流体的高变形结构的动态过程，并将其与几何和材料特性相关。可逆、剧烈压实的独特机会允许覆盖软结构、致密材料以及两者之间的混合材料。这种统一方法将传统的表征技术（例如无损参数识别、临界频率预测）扩展到新颖的结构。在子项目 II 中，非线性谐振器嵌入应变控制屈曲单元中。局部谐振器的光谱丰富度由可部署单元结构的屈曲调节，产生具有各种可调衰减机制的新型功能超材料。最有前途的几何形状的数值和实验测试将证明优化设计的稳健性和适用性。

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