Health Monitoring of Structural and Biological Systems XIII最新文献

Health Monitoring of Structural and Biological Systems XIII Pub Date : 2019-06-28 DOI: 10.1117/12.2534593

引用次数: 0

Nonlinear phased array imaging using phase (Conference Presentation) 基于相位的非线性相控阵成像(会议报告)

Health Monitoring of Structural and Biological Systems XIII Pub Date : 2019-04-01 DOI: 10.1117/12.2515808

A. Croxford, J. Potter, P. Blanloeuil

引用次数: 0

Dynamics of topological metastructures: nonlinearities and quasi-periodicity (Conference Presentation) 拓扑元结构动力学:非线性和准周期性(会议报告)

Health Monitoring of Structural and Biological Systems XIII Pub Date : 2019-04-01 DOI: 10.1117/12.2515686

M. Ruzzene

{"title":"Dynamics of topological metastructures: nonlinearities and quasi-periodicity (Conference Presentation)","authors":"M. Ruzzene","doi":"10.1117/12.2515686","DOIUrl":"https://doi.org/10.1117/12.2515686","url":null,"abstract":"Topology has recently emerged as a principle governing unique wave transport phenomena through interface or edge modes that are impurity-immune and potentially unidirectional. In mechanics, these phenomena arise by marrying the notion of material and structure, and are expected to lead to functionalities at the mesoscale that are unattainable solely based on the properties of constituents. Beyond the mere notion of a material, these meta-structures draw their unique characteristics from their finite size and the existence of interfaces. The resulting structural assemblies are expected to feature unprecedented performance in terms of stress wave mitigation, wave guiding, acoustic absorption, and vibration isolation. \u0000The seminar illustrates investigations on the effects of nonlinearities on topological properties, and the study of quasi-periodic assemblies. Investigation of the effects of nonlinearities on topological properties allows the exploration of the appearance/robustness of edge and localized modes in the presence of nonlinearities. In addition, the study of lattices with quasi-periodic configurations uncover additional unique properties related to vibration localization in one-dimensional and two-dimensional systems. These can be as interesting if not more useful than the interface modes that are found in periodic structures, as the quasi-periodicity framework provides a consistent methodology that leads to vibration confinement in systems that are not ordered, but are described by deterministic property distributions. Beam and plate structures with quasiperiodic arrangements of grounding springs and lumped masses are presented as structural components which support a variety of localized modes and that are suitable for the experimental characterization of the dynamic behavior of these configurations.","PeriodicalId":359388,"journal":{"name":"Health Monitoring of Structural and Biological Systems XIII","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125717055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hoisting safety detection technology based on faster R-CNN (Conference Presentation) 基于更快R-CNN的起重安全检测技术(会议介绍)

Health Monitoring of Structural and Biological Systems XIII Pub Date : 2019-04-01 DOI: 10.1117/12.2515287

Xuefeng Zhao, Yang Zhang, Zhen Yang, Mingyuan Zhang, Dongfang Li, Guangyi Zhou

引用次数: 0

Measuring axial stress in thick structures using highly nonlinear solitary waves (Conference Presentation) 用高度非线性孤立波测量厚结构轴向应力(会议报告)

Health Monitoring of Structural and Biological Systems XIII Pub Date : 2019-04-01 DOI: 10.1117/12.2514059

A. Nasrollahi, P. Rizzo

引用次数: 0

Evidence of reduced order nonlinear state of Lamb wave due to stress-relaxation in composites (Conference Presentation) 复合材料中应力松弛引起的Lamb波降阶非线性状态的证据(会议报告)

Health Monitoring of Structural and Biological Systems XIII Pub Date : 2019-04-01 DOI: 10.1117/12.2514485

S. Patra, Mohammad Sadegh Sadatzi, Sourav Banerjee, Hossain Ahmed

引用次数: 1

Multiple Helmholtz resonator based acoustic liner (Conference Presentation) 基于多亥姆霍兹谐振器的声学衬垫(会议报告)

Health Monitoring of Structural and Biological Systems XIII Pub Date : 2019-04-01 DOI: 10.1117/12.2514364

H. Nguyen, Guoliang Huang

{"title":"Multiple Helmholtz resonator based acoustic liner (Conference Presentation)","authors":"H. Nguyen, Guoliang Huang","doi":"10.1117/12.2514364","DOIUrl":"https://doi.org/10.1117/12.2514364","url":null,"abstract":"While most of the conventional acoustic liner which comprised of a micro-perforated panel (MPP) backed by a honeycomb structure shows good acoustic performance at high or medium frequency range, there is still very challenging for them at low-frequency range. Difference from MPP where resonance frequency of a MPP based liner is much depended on the backing space and shifting the absorption peak of the liner to low-frequency range generally makes the structure bulky and down-grades the absorbing quality, Helmholtz resonators shows easy frequency-tuning ability and outstanding absorption at low-frequency. In this research, by carefully design, the proposed designs of acoustic liner based on multiple Helmholtz resonators (MHR) show very good absorption in a broadband at low-frequency. First, a super unit-cell which is an annulus disk comprised of three segments or Helmholtz resonators is numerically studied to tune the working frequency band into the desired region, to form a broadband working region and to have the supercells absorbing potential. Afterward, the proposed liner constructed by patterning the supercells along the central axis of the liner is studied on absorption by using both commercial code (COMSOL) and theoretical analysis. The results show high absorption (>80%) at low-frequency broadband (400Hz to 650Hz) and good agreement between numerical and theoretical analysis. The proposed design and analysis can be served as effective model and tool for design and constructing advanced acoustic liners.","PeriodicalId":359388,"journal":{"name":"Health Monitoring of Structural and Biological Systems XIII","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115845480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Elastic waves in Floquet topological insulators (Conference Presentation) Floquet拓扑绝缘体中的弹性波(会议报告)

Health Monitoring of Structural and Biological Systems XIII Pub Date : 2019-04-01 DOI: 10.1117/12.2514367

Hui Chen, H. Nassar, Guoliang Huang

{"title":"Elastic waves in Floquet topological insulators (Conference Presentation)","authors":"Hui Chen, H. Nassar, Guoliang Huang","doi":"10.1117/12.2514367","DOIUrl":"https://doi.org/10.1117/12.2514367","url":null,"abstract":"Floquet Topological Insulators (FTIs) have inspired analogues in photonics, optics, and acoustics, in which non-reciprocal wave propagation in topologically protected materials, with topological immunity against structural defects and disorder, is achieved due to the breaking of time-reversal symmetry induced by time-modulation. This study aims at investigating a possibility for the existence of a mechanical analogue to the Quantum Hall Effect (QHE) in one and two-dimensional periodically modulated lattices. In 1D, the system shows topologically protected one-way edge modes as the time-modulation is turned on, which is demonstrated by the principle of bulk-edge correspondence and transient numerical simulations. The study is then extended to 2D hexagonal lattices to demonstrate the existence of Floquet topological edge modes. The band diagram and helical edge states characteristic of QHE are obtained by using the Plane Wave Expansion (PWE) method. Given the breakage of the time-reversal symmetry, the system switches from the trivial state to the nontrivial topological one that is quantified in terms of topological invariant Chern numbers. Last, the robustness of one-way edge modes and their immunity to backscattering by sharp corners, defects and modulation disorders are analyzed and assessed numerically.","PeriodicalId":359388,"journal":{"name":"Health Monitoring of Structural and Biological Systems XIII","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130904193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental validation of acoustic valley Hall edge states in a nonresonant topological elastic waveguide (Conference Presentation) 非谐振拓扑弹性波导中声谷霍尔边缘态的实验验证(会议报告)

Health Monitoring of Structural and Biological Systems XIII Pub Date : 2019-04-01 DOI: 10.1117/12.2514328

Ting-Wei Liu, F. Semperlotti

引用次数: 0

Damage detection capabilities of strain-based displacement methods in beam-like structures (Conference Presentation) 基于应变的位移方法在类梁结构中的损伤检测能力(会议报告)

Health Monitoring of Structural and Biological Systems XIII Pub Date : 2019-04-01 DOI: 10.1117/12.2515385

K. Kliewer, B. Glisic

引用次数: 0