International Conference on Smart Materials and Nanotechnology in Engineering最新文献_第9页

A novel fiber Bragg grating sensor interrogator based on time division multiplexing technique 一种基于时分复用技术的新型光纤光栅传感器询问器

International Conference on Smart Materials and Nanotechnology in Engineering Pub Date : 2009-07-25 DOI: 10.1117/12.845594

Y. Dai, Zhichun Zhang, J. Leng, A. Asundi

引用次数: 3

Study of the response time of MR dampers 磁流变阻尼器响应时间的研究

International Conference on Smart Materials and Nanotechnology in Engineering Pub Date : 2009-07-25 DOI: 10.1117/12.840217

X. Guan, P. Guo, J. Ou

{"title":"Study of the response time of MR dampers","authors":"X. Guan, P. Guo, J. Ou","doi":"10.1117/12.840217","DOIUrl":"https://doi.org/10.1117/12.840217","url":null,"abstract":"Response time is an important parameter which determines the applied fields and practical vibration reduction effects of magnetorheological (MR) dampers. However, up to now, only a few papers discuss the test and analysis of response times. In this paper, the response time of a large-scale MR damper at different velocities and currents was firstly tested. Then, the transient magnetic field excited by the time-variant excitation current was simulated by finite element method (FEM). Based on the variation of the shear yield stress of magnetorheological fluids in the gap between the cylinder and the piston, the response time of the MR damper was investigated. Influences of eddy current and excitation current response time on the damper's response were also explored. Results show that by utilizing finite elements method, the calculated average effective shear yield strength can be used to predict the response time of a MR damper. Electromagnetic response is the predominant factor influencing the response time of a MR damper, and reducing eddy currents is the key to accelerate the response of a MR damper. Moreover, influence of eddy currents is much larger under stepping down excitation currents than stepping up currents, and with a same magnitude of step, no matter when the current increases or decreases, the smaller the initial current, the greater the eddy current affects a damper's response and the longer the response time of damping force is. A fast response excitation current may induce large eddy currents which reduce the response of the damper instead.","PeriodicalId":339588,"journal":{"name":"International Conference on Smart Materials and Nanotechnology in Engineering","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122892885","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: 13

A new type of intelligent wireless sensing network for health monitoring of large-size structures 一种用于大型结构物健康监测的新型智能无线传感网络

International Conference on Smart Materials and Nanotechnology in Engineering Pub Date : 2009-07-25 DOI: 10.1117/12.843557

Y. Lei, Ch. Liu, D. T. Wu, Y. L. Tang, J. X. Wang, L. Wu, X. Jiang

{"title":"A new type of intelligent wireless sensing network for health monitoring of large-size structures","authors":"Y. Lei, Ch. Liu, D. T. Wu, Y. L. Tang, J. X. Wang, L. Wu, X. Jiang","doi":"10.1117/12.843557","DOIUrl":"https://doi.org/10.1117/12.843557","url":null,"abstract":"In recent years, some innovative wireless sensing systems have been proposed. However, more exploration and research on wireless sensing systems are required before wireless systems can substitute for the traditional wire-based systems. In this paper, a new type of intelligent wireless sensing network is proposed for the heath monitoring of large-size structures. Hardware design of the new wireless sensing units is first studied. The wireless sensing unit mainly consists of functional modules of: sensing interface, signal conditioning, signal digitization, computational core, wireless communication and battery management. Then, software architecture of the unit is introduced. The sensing network has a two-level cluster-tree architecture with Zigbee communication protocol. Important issues such as power saving and fault tolerance are considered in the designs of the new wireless sensing units and sensing network. Each cluster head in the network is characterized by its computational capabilities that can be used to implement the computational methodologies of structural health monitoring; making the wireless sensing units and sensing network have \"intelligent\" characteristics. Primary tests on the measurement data collected by the wireless system are performed. The distributed computational capacity of the intelligent sensing network is also demonstrated. It is shown that the new type of intelligent wireless sensing network provides an efficient tool for structural health monitoring of large-size structures.","PeriodicalId":339588,"journal":{"name":"International Conference on Smart Materials and Nanotechnology in Engineering","volume":"33 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114117505","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: 3

Modeling thermo-mechanical behaviors of reinforced shape memory polymer under cyclic loads 循环载荷作用下增强形状记忆聚合物的热力学行为建模

International Conference on Smart Materials and Nanotechnology in Engineering Pub Date : 2009-07-25 DOI: 10.1117/12.837352

Bo Zhou, X. Lan, Yanju Liu, J. Leng

引用次数: 2

Study on the bifurcation and chaos of giant magnetostrictive actuators 超磁致伸缩作动器的分岔与混沌研究

International Conference on Smart Materials and Nanotechnology in Engineering Pub Date : 2009-07-25 DOI: 10.1117/12.839988

H. Zeng, Wenwang Li

引用次数: 1

Application of cement-based piezoelectric composites in acoustic emission detection for concrete 水泥基压电复合材料在混凝土声发射检测中的应用

International Conference on Smart Materials and Nanotechnology in Engineering Pub Date : 2009-07-25 DOI: 10.1117/12.842045

L. Qin, Y. Peng, Hongwei Ren, Zongjin Li

引用次数: 5

Self-assembly thin films of poly (acrylic acid)-titanium oxide 聚丙烯酸-氧化钛自组装薄膜

International Conference on Smart Materials and Nanotechnology in Engineering Pub Date : 2009-07-25 DOI: 10.1117/12.834584

Xuefeng Li, Shaoxian Peng

引用次数: 1

A preliminary study on anti-irradiation performance of epoxy shape memory polymer 环氧形状记忆聚合物抗辐照性能的初步研究

International Conference on Smart Materials and Nanotechnology in Engineering Pub Date : 2009-07-25 DOI: 10.1117/12.845750

Xuelian Wu, Yanju Liu, J. Leng

{"title":"A preliminary study on anti-irradiation performance of epoxy shape memory polymer","authors":"Xuelian Wu, Yanju Liu, J. Leng","doi":"10.1117/12.845750","DOIUrl":"https://doi.org/10.1117/12.845750","url":null,"abstract":"As a new class of smart material, shape memory polymer (SMP) receives more and more attention. In this paper, in addition to the fabrication of a new type of epoxy SMP, the thermo-mechanical properties of the polymer with/without gamma irradiation were investigated and compared systematically. The radiation source is Co-60 and the total dosage of radiation is 1×104Gy. Changes of network structures of the polymer were investigated by Fourier Transform Infrared (FTIR) spectroscopy. The influence of gamma irradiation on thermo and mechanical properties of the polymer were investigated by Differential Scanning Calorimetry (DSC), Dynamic Mechanical Analysis (DMA) and tensile test, respectively. Furthermore, shape recovery behaviors of the polymer before/after the irradiation were compared too. Results show that the epoxy SMP possesses good chemical stability, glass transition temperature (Tg) determined by DSC decreased by 7°C after the irradiation. The gamma radiation has a slight influence on storage modulus, loss modulus and tan delta, respectively. No considerable change was found both in tensile strength and elongation at break after the gamma radiation. Finally, the shape recovery ratio of the polymer is near 100% with and without the gamma irradiation. Based on the above results, it can be demonstrated that the epoxy SMP prepared in the study possesses not only good thermo-mechanical properties but unique anti irradiation performance. The epoxy SMP shows potential for application of aerospace fields.","PeriodicalId":339588,"journal":{"name":"International Conference on Smart Materials and Nanotechnology in Engineering","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123410871","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

Preparation of single crystal of TiNi alloy and its shape memory performance TiNi合金单晶的制备及其形状记忆性能

International Conference on Smart Materials and Nanotechnology in Engineering Pub Date : 2009-07-25 DOI: 10.1117/12.839448

Chong-he Li, Ziming Guo, M. Zhu, Xionggang Lu, Xiaosu Ye, Panxin Zhang, Q. Zhai

{"title":"Preparation of single crystal of TiNi alloy and its shape memory performance","authors":"Chong-he Li, Ziming Guo, M. Zhu, Xionggang Lu, Xiaosu Ye, Panxin Zhang, Q. Zhai","doi":"10.1117/12.839448","DOIUrl":"https://doi.org/10.1117/12.839448","url":null,"abstract":"The unidirectional solidification equipment based on Bridgman method with high temperature gradient was designed, and the single crystal of Ti-50.0at%Ni alloy was successfully fabricated by this equipment as well as a selective growing zigzag-shaped crystallizer and a steady growth container that were made of electro graphite. The microstructure of single crystal sample was studied by means of Optical Microscopy (OM), Scanning Electron Microscopy (SEM) and Energy Dispersive Spectrometer (EDS); the orientation of single crystal was measured by X-ray technology; the phase transformation points were determined by Differential Scanning Calorimetry (DSC). It is resulted that, the single crystal of TiNi shape memory alloy (SMA) can be prepared with a set of suitable process parameters; the microstructure of the single crystal obtained in this study is dendritic, there is Ti2Ni intermetallic between the dendrites, the angle between the orientation of single crystal and [111] plane is about 15 degree; the shape memory performances are improved obviously and the maximum recoverable strain reaches 10%.","PeriodicalId":339588,"journal":{"name":"International Conference on Smart Materials and Nanotechnology in Engineering","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123434563","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: 3

Study on interface behavior of 3D composites reinforced with chemically connected CNTs using molecular dynamics 基于分子动力学的化学连接CNTs增强三维复合材料界面行为研究

International Conference on Smart Materials and Nanotechnology in Engineering Pub Date : 2009-07-25 DOI: 10.1117/12.839957

Lin Yang, Xiaodong He, L. Tong

引用次数: 0