Collaborative Research: Highly Nonlinear Transducer Arrays for Structural Health Monitoring

合作研究：用于结构健康监测的高度非线性传感器阵列

• 批准号: 1200319
• 负责人: Chiara Daraio
• 金额: $ 26万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-15 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1200319&HistoricalAwards=false
• 关键词: Collaborative; Research; Highly; Nonlinear; Transducer

This propoject will investigate the fundamental properties and applications of novel arrays of nonlinear actuators for the nondestructive evaluation (NDE) and structural health monitoring (SHM) of civil structures and materials. The investigators will also explore the ability to use the nonlinear actuators for focusing and harvesting elastic energy, and for imaging bulk materials. The arrays of nonlinear actuators included in this study can generate highly nonlinear solitary waves (HNSWs), which are compact non-dispersive stress waves with a finite spatial dimension. The spatial dimension of these pulses is independent of the wave amplitude and dependent only on the nonlinear material's geometry. HNSWs hold promise to improve current NDE/SHM devices because of their ability to support non-oscillatory, high amplitude signals that rely exclusively on mechanical excitations. On a fundamental level, the investigators aim at understanding the behavior of arrays of highly nonlinear actuators adjacent to different neighboring solid media. In particular, they will: (i) study the ability to focus nonlinear waves as a function of the properties of the adjacent media, (ii) design and implement methods to improve transmission of the signal across the interface between the actuators and the adjacent media; (iii) determine the limitations of signal power and the degradation of performance due to failure of the highly nonlinear actuators. From a purely applied perspective, the project will be devoted to the application of HNSWs for the NDE/SHM of structural materials. Besides the impact to the nonlinear dynamics scientific community, the proposed research will have strategic importance to a broad range of engineering applications. The NDE/SHM component of this research enables to increase the safety of existing civil and aerospace structures. The ability to harvest focused elastic energy has the potential to create new, sustainable means to power small electronic devices and sensors. This research outcomes will enable the development of novel transducers arrays for acoustic imaging, the successful outcome of our research could impact the biomedical imaging community.Some of the research outcomes and experiments will be integrated into the investigators' teaching portfolio and into outreach activities. This research will provide multidisciplinary training for all participating students. As the submission of at least one patent application is forecast, potential marketing opportunities will be explored. Finally, the research results will be broadly disseminated through the submission of journal articles and through the presentation at conferences of international audience.

该提案将研究非线性执行器新阵列的基本属性和应用，用于无损评估（NDE）和民用结构和材料的结构健康监测（SHM）。研究人员还将探索使用非线性执行器来集中和收集弹性能的能力，以及成像散装材料。本研究中包括的非线性致动器的阵列可以产生高度非线性的孤立波（HNSW），它们是具有有限空间维度的紧凑型非分散应力波。这些脉冲的空间维度独立于波幅度，仅取决于非线性材料的几何形状。 HNSWS有望改善当前的NDE/SHM设备，因为它们具有仅依赖机械激发的非振荡，高振幅信号的能力。在基本层面上，研究人员旨在了解与不同邻近固体媒体相邻的高度非线性执行器的阵列的行为。特别是：（i）研究能够将非线性波集中到相邻介质的特性的函数，（ii）设计和实施方法，以改善信号传输在执行器与相邻介质之间的界面之间; （iii）确定信号功率的局限性和由于高度非线性执行器失败而导致的性能降解。从纯粹应用的角度来看，该项目将致力于将HNSWS应用于结构材料的NDE/SHM。除了对非线性动力学科学界的影响外，拟议的研究还将对广泛的工程应用具有战略意义。这项研究的NDE/SHM组成部分使现有的民用和航空航天结构的安全性。收获集中弹性能量的能力有可能创造新的可持续方法来为小型电子设备和传感器提供动力。这项研究结果将使新型传感器阵列用于声学成像，我们的研究的成功结果可能会影响生物医学成像群落。研究成果的某些和实验将集成到研究人员的教学组合和外展活动中。这项研究将为所有参与学生提供多学科培训。由于预测至少是一项专利申请的提交，将探讨潜在的营销机会。最后，通过提交期刊文章以及在国际观众会议上的演讲，将大致传播研究结果。