Tunable Tensegrity Structures and Metamaterials

可调谐张拉整体结构和超材料

• 批准号: 2323276
• 负责人: Glaucio Paulino
• 金额: $ 65.96万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-03-01 至 2027-02-28
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2323276&HistoricalAwards=false
• 关键词: Tunable; Tensegrity; Structures; Metamaterials

Tensegrities are special structures composed of compression struts connected by a continuous network of tension cables in a state of prestress. These structures exhibit extreme properties such as low-mass and weight, high-resilience, high-strength, and rich-tunability. These properties can be harnessed for use in engineering applications and potentially exceed the performance of currently established solutions. In addition, tensegrity structures have been used in an increasing number of engineering applications, including deployable domes, tunable antennas, and sustainable adaptive solar arrays to name a few. From a geometrical perspective, tensegrities have been shown to be scalable: applications ranging from large space structures to the micro and nano scales have proven their cross-scale applicability. Although many have viewed the prestress requirement as a hindrance to further development of tensegrity structures, this project explores this burgeoning trend by continuing to examine the premise that prestress requirements enable tensegrities to be deployable, tunable, and morphable. This research project will contribute theoretical, computational and experimental capabilities to advance the field of tensegrity structures and metamaterials, and to discover novel modes of tensegrity functionality. The research will be complemented by establishing a flexible educational and outreach program based on curriculum development, training demonstrations, and increasing awareness of these structures by disseminating our findings and tools, in addition to sharing investigator experiences broadly to the public and research communities. The goal of the research is to achieve a deep understanding of tensegrities in order to: (i) design or find tensegrities in any geometry, with the possibility of holes and openings, allowing for application specific tensegrity designs; (ii) use additive manufacturing to conduct rapid prototyping and proof of concept of new designs; (iii) construct and manufacture large-scale application-oriented tensegrity structures (e.g. human-scale), document the experience, and disseminate the challenges and solutions; (iv) design programmable/reprogrammable tensegrity-based metamaterials and study their dynamic characteristics using a Bloch wave analysis framework; and (v) investigate the influence of prestress level to change the size and distribution of band gaps within the tensegrity metamaterial. Specifically, this project should lead to the creation and analysis of elegant Class-1 (“floating struts”) reprogrammable tensegrity metamaterials, and large-scale tensegrity structures which may be used in the design of temporary shelters or structural component protection, among others. As such, it will advance the knowledge base in structures, theoretical and computational mechanics, manufacturing, and materials engineering.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

张拉体是由处于预应力状态的连续张拉索网络连接的压杆组成的特殊结构。这些结构具有低质量和重量、高回弹性、高强度和丰富的可调性等极端特性。这些特性可以用于工程应用，并且可能超过目前建立的解决方案的性能。此外，张拉整体结构已在越来越多的工程应用中得到应用，包括可展开圆顶、可调谐天线和可持续自适应太阳能电池阵列等。从几何角度来看，张拉整体已经被证明是可扩展的：从大空间结构到微纳米尺度的应用已经证明了它们的跨尺度适用性。尽管许多人认为预应力要求是张拉整体结构进一步发展的障碍，但本项目通过继续研究预应力要求使张拉整体结构能够部署、可调和可变形的前提，探索了这一迅速发展的趋势。该研究项目将贡献理论、计算和实验能力，以推动张拉整体结构和超材料领域的发展，并发现新的张拉整体功能模式。除了向公众和研究界广泛分享研究者的经验外，还将建立一个灵活的教育和推广计划，以课程开发、培训演示为基础，通过传播我们的发现和工具来提高对这些结构的认识。研究的目标是实现对张拉整体的深刻理解，以便：(i)设计或发现任何几何形状的张拉整体，具有孔和开口的可能性，允许特定应用的张拉整体设计；（ii）使用增材制造进行快速原型设计和新设计概念验证；（iii）建造和制造大规模面向应用的张拉整体结构（例如人体尺度），记录经验，并传播挑战和解决方案；（iv）设计可编程/可重新编程的基于张拉整体的超材料，并使用布洛赫波分析框架研究其动态特性；(v)研究预应力水平对张拉整体超材料内带隙大小和分布的影响。具体而言，该项目应导致创建和分析优雅的1类（“浮动支柱”）可编程张拉整体超材料，以及可用于设计临时避难所或结构组件保护等的大型张拉整体结构。因此，它将推进知识基础在结构，理论和计算力学，制造和材料工程。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。