GOALI/Collaborative Research: Nonlinear Energy Dynamics of Aerodynamically Coupled Oscillators

GOALI/合作研究：空气动力耦合振荡器的非线性能量动力学

• 批准号: 2131594
• 负责人: Balakumar Balachandran
• 金额: $ 63.51万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-01 至 2025-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2131594&HistoricalAwards=false
• 关键词: GOALI; Collaborative; Research; Nonlinear; Energy

Wind energy became the largest renewable energy generated in the US in 2019, and this energy is projected to be a signification portion of all generated electrical energy in the nation within a decade. The introduction of large wind turbines has been considered to be an important direction, as they can result in an increase in generated power. However, wind turbines may not be the best solution for all wind speeds and locations such as building roof-tops. As an alternative, a set of piezoelectric harvesters, which can be used with small foot-prints and at low wind speeds will be studied. These harvesters represent an example of an oscillatory system, in which the coupling between the structural members is dominated by fluid forces that are generated during motions through an air flow. Other oscillatory systems with similar fluid (aerodynamic) coupling include rotating blades in turbine generators, compressors, and turbo fans. Through support of this Grant Opportunity for Academic Liaison with Industry (GOALI) award, fundamental studies will be pursued to develop and extend the knowledge base on aerodynamically coupled oscillators. A salient impact is expected to be the advancement of our understanding of the nonlinear behavior of systems involving fluid-structural-electromechanical interactions. Through experimental demonstrations of the feasibility of these systems, it is expected that one can design and build piezoelectric energy harvesters for use in building systems and tethered unmanned vehicle systems. This work will usher in a new generation of researchers trained to use multi-disciplinary tools suited for study of nonlinear dynamics of energy harnessing systems.Building on prior efforts on nonlinear oscillators, aeroelasticity, experimental fluid mechanics, and active materials, a team of researchers from academia and industry will pursue the common goal of developing a fundamental understanding of aerodynamically coupled piezoelastic oscillators. The group will conduct original wind tunnel experiments to understand flow induced oscillations of thin airfoil oscillator arrays and bluff body oscillator arrays and study the energy distribution in the system responses across a variety of flows. Informed by experimental findings and guided by industry experience, modeling and simulation efforts will be undertaken to uncover nonlinear phenomena and nonlinear instabilities including Hopf instabilities. On the fundamental side, one of the outcomes will be an enhanced understanding of the behavior of the coupled oscillators with aerodynamic coupling, the nature of this coupling for different flows and oscillator configurations, and the associated nonlinear fluid-structure interactions. On the application side, this work will result in performance characterization tools for energy harnessing arrays based on streamlined and bluff body oscillators.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.

风能在2019年成为美国最大的可再生能源，预计这种能源将在十年内成为美国所有发电能源的重要组成部分。大型风力涡轮机的引入被认为是一个重要的方向，因为它们可以导致发电量的增加。然而，风力涡轮机可能不是所有风速和位置（如建筑物屋顶）的最佳解决方案。作为一种替代方案，将研究一套压电收割机，它可以在低风速下使用。这些收割机代表振荡系统的示例，其中结构构件之间的耦合由在通过空气流的运动期间产生的流体力支配。具有类似流体（空气动力学）耦合的其它振荡系统包括涡轮机发电机、压缩机和涡轮风扇中的旋转叶片。通过支持这一赠款机会学术联络与工业（GOALI）奖，基础研究将继续发展和扩大知识基础上的空气动力耦合振荡器。一个显着的影响，预计将是我们的理解，涉及流体结构机电相互作用的系统的非线性行为的进步。通过这些系统的可行性的实验演示，预计可以设计和建造用于建筑系统和系留无人驾驶车辆系统的压电能量采集器。这项工作将迎来新一代的研究人员培训使用多学科的工具，适用于研究非线性动力学的能源利用系统。建立在非线性振荡器，气动弹性，实验流体力学和活性材料的前期工作，一个团队的研究人员从学术界和工业界将追求共同的目标，发展一个基本的了解气动耦合压电弹性振荡器。该小组将进行原始的风洞实验，以了解薄翼型振荡器阵列和海崖体振荡器阵列的流致振荡，并研究各种流中系统响应的能量分布。根据实验结果和行业经验，建模和仿真工作将揭示非线性现象和非线性不稳定性，包括霍普夫不稳定性。在基本面上，结果之一将是增强对具有气动耦合的耦合振荡器的行为的理解，这种耦合对于不同流动和振荡器配置的性质，以及相关的非线性流体-结构相互作用。在应用方面，这项工作将导致基于流线型和海崖体振荡器的能量利用阵列的性能表征工具。该奖项反映了NSF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。