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Health Monitoring of Structural and Biological Systems XIII最新文献

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Space-time modulated programmable metamaterial beam for nonreciprocal control of flexural waves (Conference Presentation) 弯曲波非互易控制的时空调制可编程超材料束(会议报告)
Health Monitoring of Structural and Biological Systems XIII Pub Date : 2019-04-01 DOI: 10.1117/12.2514165
Yangyang Chen, Xiaopeng Li, H. Nassar, Guoliang Huang
{"title":"Space-time modulated programmable metamaterial beam for nonreciprocal control of flexural waves (Conference Presentation)","authors":"Yangyang Chen, Xiaopeng Li, H. Nassar, Guoliang Huang","doi":"10.1117/12.2514165","DOIUrl":"https://doi.org/10.1117/12.2514165","url":null,"abstract":"Reciprocity is a fundamental principle in acoustics, posing constraints on the way we process acoustic signals. Breaking reciprocity with spatiotemporal modulations provides an opportunity to design compact, low-energy, integrated non-reciprocal acoustic devices. Here, we design and experimentally demonstrate a space-time modulated programmable metamaterial beam with electromagnet resonators controlled by currents. A numerical approach based on the finite element method is developed for wave dispersion calculations of space-time modulated programmable metamaterials with complex geometries. Unidirectional band gaps are demonstrated experimentally and numerically in a good agreement. We quantify effects of the modulation amplitude and material damping in terms of band gap width and attenuation factor of the unidirectional band gaps in the space-time modulated metamaterial beam. Lastly, the unidirectional band gaps due to the second-order mode coupling caused by strong modulations are identified and examined numerically. Our design as well as the numerical approach provide a practical solution for the applications of non-reciprocal acoustic devices with spatiotemporal modulations.","PeriodicalId":359388,"journal":{"name":"Health Monitoring of Structural and Biological Systems XIII","volume":"3 5 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":"120989825","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
The critical point’s control of parity-time symmetric beam structure (Conference Presentation) 奇偶时对称梁结构的临界点控制(会议报告)
Health Monitoring of Structural and Biological Systems XIII Pub Date : 2019-04-01 DOI: 10.1117/12.2514260
Zheng Li, Jianlin Yi
{"title":"The critical point’s control of parity-time symmetric beam structure (Conference Presentation)","authors":"Zheng Li, Jianlin Yi","doi":"10.1117/12.2514260","DOIUrl":"https://doi.org/10.1117/12.2514260","url":null,"abstract":"","PeriodicalId":359388,"journal":{"name":"Health Monitoring of Structural and Biological Systems XIII","volume":"52 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":"123656806","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
Prediction of the amplitude of ultrasound reflection from rough defects (Conference Presentation) 粗糙缺陷超声反射振幅的预测(会议报告)
Health Monitoring of Structural and Biological Systems XIII Pub Date : 2019-04-01 DOI: 10.1117/12.2514546
M. Lowe, F. Shi, S. Haslinger, P. Huthwaite, R. Craster
{"title":"Prediction of the amplitude of ultrasound reflection from rough defects (Conference Presentation)","authors":"M. Lowe, F. Shi, S. Haslinger, P. Huthwaite, R. Craster","doi":"10.1117/12.2514546","DOIUrl":"https://doi.org/10.1117/12.2514546","url":null,"abstract":"","PeriodicalId":359388,"journal":{"name":"Health Monitoring of Structural and Biological Systems XIII","volume":"9 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":"127186917","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
Convenient tunable metasurface for acoustic wave manipulation (Conference Presentation) 用于声波操纵的方便可调超表面(会议报告)
Health Monitoring of Structural and Biological Systems XIII Pub Date : 2019-04-01 DOI: 10.1117/12.2514013
Zhong Chen
{"title":"Convenient tunable metasurface for acoustic wave manipulation (Conference Presentation)","authors":"Zhong Chen","doi":"10.1117/12.2514013","DOIUrl":"https://doi.org/10.1117/12.2514013","url":null,"abstract":"The manipulation of acoustic wave has broad applications in ultrasonic medical equipment,acoustic detection,noise isolation and many other fields. As a way to control acoustic waves, metasurface is not only small in size, simple to manufacture, but also can control acoustic waves in various patterns with high precision. Up till now, most metasurfaces are fixed structures that can only realize one changeless acoustic wave manipulation purpose. This presentation intends to study a new type of tunable ultrasonic metasurface to control different refraction angles or focus plane waves. According to Snell's formula, the refraction angle of a wave can be controlled by the phase gradient along the interface. Here we design a metasurface, which can manipulate wave in different patterns by simple mechanical movement without external circuits and electromagnets. This presentation demonstrates the feasibility of the design based on theory and finite element simulation, and will provide a novel perspective in the field of acoustic wave control research.","PeriodicalId":359388,"journal":{"name":"Health Monitoring of Structural and Biological Systems XIII","volume":"35 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":"132070669","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
A study on asymmetric sensor array for robust improvement of beamforming based source localization technique (Conference Presentation) 非对称传感器阵列对波束形成源定位技术鲁棒性改进的研究(会议报告)
Health Monitoring of Structural and Biological Systems XIII Pub Date : 2019-04-01 DOI: 10.1117/12.2514221
Hweekwon Jung, G. Park
{"title":"A study on asymmetric sensor array for robust improvement of beamforming based source localization technique (Conference Presentation)","authors":"Hweekwon Jung, G. Park","doi":"10.1117/12.2514221","DOIUrl":"https://doi.org/10.1117/12.2514221","url":null,"abstract":"","PeriodicalId":359388,"journal":{"name":"Health Monitoring of Structural and Biological Systems XIII","volume":"82 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":"123965131","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
Structural health monitoring: a view of the entrepreneur (Conference Presentation) 结构健康监测:企业家的观点(会议发言)
Health Monitoring of Structural and Biological Systems XIII Pub Date : 2019-04-01 DOI: 10.1117/12.2514484
T. Uhl
{"title":"Structural health monitoring: a view of the entrepreneur (Conference Presentation)","authors":"T. Uhl","doi":"10.1117/12.2514484","DOIUrl":"https://doi.org/10.1117/12.2514484","url":null,"abstract":"Nowadays there is pressure for commercialization of research from founding agencies, but the process of commercialization of research needs time and support to be successful because there are several stages and limits which should be crossed to achieve a market product. Some of them are related to technical issues but some are related to business problems. One possible path of commercialization is creating new start-up companies. During this presentation, problems of research commercialization will be listed and discussed. Some case studies related to SHM technology will be presented. Particularly, the talk will focus on active thermography and applications, predictive maintenance based on AI algorithms and its application, on sensors design and application, and some UAV-based solutions.","PeriodicalId":359388,"journal":{"name":"Health Monitoring of Structural and Biological Systems XIII","volume":"180 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":"116328027","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
Blood volume flow measurement using a flexible ultrasound transducer (Conference Presentation) 使用柔性超声换能器测量血容量流量(会议报告)
Health Monitoring of Structural and Biological Systems XIII Pub Date : 2019-04-01 DOI: 10.1117/12.2515223
Chang Peng, Howuk Kim, Taeyang Kim, Xiaoning Jiang
{"title":"Blood volume flow measurement using a flexible ultrasound transducer\u0000\u0000 (Conference Presentation)","authors":"Chang Peng, Howuk Kim, Taeyang Kim, Xiaoning Jiang","doi":"10.1117/12.2515223","DOIUrl":"https://doi.org/10.1117/12.2515223","url":null,"abstract":"The aim of this research study is to develop a flexible ultrasound transducer capable of determining the blood volume flow. Currently, there are a few different methods of measuring fluid flow inside a vessel using ultrasound. In Doppler shift and time transit flowmeters, a wedge has been used to mount a piezoelectric transducer in order to create a known angle between the direction of fluid flow and the direction of generated wave propagation. In general, the flat nature of piezoelectric transducers has restricted the application of this method to mounting surfaces with known geometry. However, in a recent study, a flexible piezo-composite ultrasonic transducer was developed using PZT-5H and a passive polymer matrix (PDMS). Due to the flexibility of this unique transducer, it can be mounted on surfaces of unknown and varying geometry. In the context of measuring the blood flow rate in a human vessel, the transducer can be integrated into a wearable device capable of determining the orientation and position of the vessel’s path using wave time of flight. In this article, we measured a flow speed using the flexible transducer embedded on a curved surface of a tissue-mimicking material, in which water flows through an artificial flow vessel aligned in a known angular direction. Then, the velocity of the flowing medium in the vessel is estimated by using the Doppler shift method. The experimental results will provide the fundamental background for application of the flexible transducer to the wearable device capable of measuring the blood flow and the pressure.","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":"130297641","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
A tunable two-way, one-dimensional acoustic diode (Conference Presentation) 一种可调谐的双向一维声学二极管(会议报告)
Health Monitoring of Structural and Biological Systems XIII Pub Date : 2019-04-01 DOI: 10.1117/12.2515602
Wei-qiu Chen
{"title":"A tunable two-way, one-dimensional acoustic diode (Conference Presentation)","authors":"Wei-qiu Chen","doi":"10.1117/12.2515602","DOIUrl":"https://doi.org/10.1117/12.2515602","url":null,"abstract":"","PeriodicalId":359388,"journal":{"name":"Health Monitoring of Structural and Biological Systems XIII","volume":"7 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":"127883236","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
Manipulating elastic waves in real time with programmable metasurfaces (Conference Presentation) 用可编程元表面实时操纵弹性波(会议报告)
Health Monitoring of Structural and Biological Systems XIII Pub Date : 2019-04-01 DOI: 10.1117/12.2514167
Yangyang Chen, Xiaopeng Li, H. Nassar, Guoliang Huang
{"title":"Manipulating elastic waves in real time with programmable metasurfaces (Conference Presentation)","authors":"Yangyang Chen, Xiaopeng Li, H. Nassar, Guoliang Huang","doi":"10.1117/12.2514167","DOIUrl":"https://doi.org/10.1117/12.2514167","url":null,"abstract":"","PeriodicalId":359388,"journal":{"name":"Health Monitoring of Structural and Biological Systems XIII","volume":"13 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":"121650078","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
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