International Conference on Smart Materials and Nanotechnology in Engineering最新文献

A new diagnostic method of bolt loosening detection for thermal protection systems 热保护系统螺栓松动检测诊断新方法

International Conference on Smart Materials and Nanotechnology in Engineering Pub Date : 2009-10-20 DOI: 10.1117/12.843778

W. Xie, S. Meng, Jiecai Han, S. Du, Bo-ming Zhang, Dong Yu

{"title":"A new diagnostic method of bolt loosening detection for thermal protection systems","authors":"W. Xie, S. Meng, Jiecai Han, S. Du, Bo-ming Zhang, Dong Yu","doi":"10.1117/12.843778","DOIUrl":"https://doi.org/10.1117/12.843778","url":null,"abstract":"Research and development efforts are underway to provide structural health monitoring systems to ensure the integrity of thermal protection system (TPS). An improved analytical method was proposed to assess the fastener integrity of a bolted structure in this paper. A new unsymmetrical washer was designed and fabricated, taking full advantage of piezoelectric ceramics (PZT) to play both roles as actuators and sensors, and using energy as the only extracted feature to identify abnormality. This diagnostic method is not restricted by the materials of the bracket, panel and base structure of the TPS whose condition is under inspection. A series of experiments on a metallic honeycomb sandwich panel were completed to demonstrate the capability of detecting bolt loosening on the TPS structure. Studies showed that this method can be used not only to identify the location of loosened bolts rapidly, but also to estimate the torque level of loosening bolts. Since that energy is the only extracted feature used to detect bolt loosening in this method, the diagnostic process become very simple and swift without sacrificing the accuracy of the results.","PeriodicalId":339588,"journal":{"name":"International Conference on Smart Materials and Nanotechnology in Engineering","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125132632","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

Design and test of a micro-displacement actuator based on giant magnetostrictive material 基于超磁致伸缩材料的微位移驱动器的设计与试验

International Conference on Smart Materials and Nanotechnology in Engineering Pub Date : 2009-10-20 DOI: 10.1117/12.840039

L. Shao, Dehua Yang, Bintang Yang, Kunxin Chen

{"title":"Design and test of a micro-displacement actuator based on giant magnetostrictive material","authors":"L. Shao, Dehua Yang, Bintang Yang, Kunxin Chen","doi":"10.1117/12.840039","DOIUrl":"https://doi.org/10.1117/12.840039","url":null,"abstract":"To meet the performance requirements of co-focusing and co-phasing of segmented mirror active optics (SMAO) in modern astronomical telescope, micro-displacement actuators with nanometer resolution and millimeter stroke are necessary. The design and test of a micro-displacement actuator based on giant magnetostrictive material is present in this paper. The actuator's main components, such as giant magnetostrictive drive core, displacement pantograph mechanism and output guide mechanism, are discussed in detailed. The giant magnetostrictive drive mechanism generally may offer nanometer resolution and micron stroke. A displacement/stroke pantograph mechanism is designed with absolutely sealed flexible hydraulic structure (ASFHS) to enlarge the stroke. In addition, a secondary giant magnetostrictive drive mechanism is integrated to serve final resolution of final displacement output. In view of flexure exhibiting excellent mechanical properties free of friction, clearance and lubrication, a flexure guide mechanism with the capacity of excellent lateral load is designed to fulfill linear displacement output steadily. The sub-systems like the giant magnetostrictive drive core and displacement pantograph mechanism have been tested before integration of the whole actuator. The final test of the actuator is carried out with dual frequency laser interferometer at lab. Besides, to meet technical requirements of future extremely large telescope, further development issues mainly related to application practice of the actuator is discussed at the end.","PeriodicalId":339588,"journal":{"name":"International Conference on Smart Materials and Nanotechnology in Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127000330","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

Design and construction of pre-stressed piezoelectric unimorph for trailing edge flap actuation 后缘襟翼驱动预应力压电单晶片的设计与制造

International Conference on Smart Materials and Nanotechnology in Engineering Pub Date : 2009-10-20 DOI: 10.1117/12.825055

Lae-Hyong Kang, Jong-Won Lee, Jae-Hung Han

引用次数: 0

Guided-wave-based detections of weld and crack in steel plates 基于导波的钢板焊缝和裂纹检测

International Conference on Smart Materials and Nanotechnology in Engineering Pub Date : 2009-10-20 DOI: 10.1117/12.845656

Mingyu Lu, Xi Lu, Limin Zhou, Z. Su, L. Ye

{"title":"Guided-wave-based detections of weld and crack in steel plates","authors":"Mingyu Lu, Xi Lu, Limin Zhou, Z. Su, L. Ye","doi":"10.1117/12.845656","DOIUrl":"https://doi.org/10.1117/12.845656","url":null,"abstract":"The guided-wave-based damage detection techniques using structurally integrated Lead-zirconate-titanate (PZT) patches for structural health monitoring (SHM) have been developed for many years. However, the method is still in its formative years and one of the main challenges is the application in real-word complicated structures. It's very important to widely study the techniques in the structures with simple geometries which can be used to construct more complicated structures for practical applications. In this paper, different steel plates of the same dimensions were used for detecting a 2mm-gap through-crack in welded zone and studying the effects of different impurities such as water, alcohol, epoxy and mud in the crack on wave propagations. Advanced signal processing and pattern recognition techniques such as the wavelet transform (WT) especially continuous wavelet transform (CWT) and Hilbert transform (HT) were used to enhance the efficiency of damage detections in the steel plates. Some simulation results were obtained to validate of experimental results. The results from both the experiments and simulations show the validity of the proposed method and the effects of different factors on the damage detection of the steel plates.","PeriodicalId":339588,"journal":{"name":"International Conference on Smart Materials and Nanotechnology in Engineering","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125448781","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: 6

Reliability assessment of long span bridges based on structural health monitoring: application to Yonghe Bridge 基于结构健康监测的大跨度桥梁可靠度评估——在永和大桥上的应用

International Conference on Smart Materials and Nanotechnology in Engineering Pub Date : 2009-10-20 DOI: 10.1117/12.838666

Shunlong Li, Hui Li, J. Ou, Hong-wen Li

{"title":"Reliability assessment of long span bridges based on structural health monitoring: application to Yonghe Bridge","authors":"Shunlong Li, Hui Li, J. Ou, Hong-wen Li","doi":"10.1117/12.838666","DOIUrl":"https://doi.org/10.1117/12.838666","url":null,"abstract":"This paper presents the reliability estimation studies based on structural health monitoring data for long span cable stayed bridges. The data collected by structural health monitoring system can be used to update the assumptions or probability models of random load effects, which would give potential for accurate reliability estimation. The reliability analysis is based on the estimated distribution for Dead, Live, Wind and Temperature Load effects. For the components with FBG strain sensors, the Dead, Live and unit Temperature Load effects can be determined by the strain measurements. For components without FBG strain sensors, the Dead and unit Temperature Load and Wind Load effects of the bridge can be evaluated by the finite element model, updated and calibrated by monitoring data. By applying measured truck loads and axle spacing data from weight in motion (WIM) system to the calibrated finite element model, the Live Load effects of components without FBG sensors can be generated. The stochastic process of Live Load effects can be described approximately by a Filtered Poisson Process and the extreme value distribution of Live Load effects can be calculated by Filtered Poisson Process theory. Then first order reliability method (FORM) is employed to estimate the reliability index of main components of the bridge (i.e. stiffening girder).","PeriodicalId":339588,"journal":{"name":"International Conference on Smart Materials and Nanotechnology in Engineering","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127776891","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

Multi-walled carbon nanotubes under protons beam irradiation 质子束辐照下的多壁碳纳米管

International Conference on Smart Materials and Nanotechnology in Engineering Pub Date : 2009-10-20 DOI: 10.1117/12.845071

A. Ishaq, A. Sobia, Long Yan, Xingtai Zhou, De-zhang Zhu

引用次数: 3

Design of lath-shaped tool in defective nanostructure removal from digital touch-panel surfaces 板条形工具去除数字触摸屏表面缺陷纳米结构的设计

International Conference on Smart Materials and Nanotechnology in Engineering Pub Date : 2009-10-20 DOI: 10.1117/12.840503

P. Pa

{"title":"Design of lath-shaped tool in defective nanostructure removal from digital touch-panel surfaces","authors":"P. Pa","doi":"10.1117/12.840503","DOIUrl":"https://doi.org/10.1117/12.840503","url":null,"abstract":"An effective economic viability that uses micro electroremoval as a reclaim system was developed to remove the defective ITO nanostructure coatings from the optical PET surfaces of digital paper. The low yield of ITO thin film deposition is an important factor in semiconductor production. By establishing the reclaim process using the ultra-precise removal of the nanostructure coatings, the optoelectronic semiconductor industry can effectively reclaim defective products, minimizing both production costs and pollution. In the current experiment, a large lath-shaped cathode with a small gap-width between the cathode and the workpiece takes less time for the same amount of ITO removal. A small end radius of the cathode combines with enough electric power to drive fast machining. Pulsed direct current can improve the effect of dreg discharge, and it is advantageous to associate the workpiece with the fast feed rate. However, this improvement can increase the current rating. A high rotational speed of the electrodes, a higher temperature, or a large flow rate of the electrolyte corresponds to a higher removal rate for the ITO nanostructure. The micro electroremoval requires only a short period of time to remove the ITO thin film coatings easily and cleanly.","PeriodicalId":339588,"journal":{"name":"International Conference on Smart Materials and Nanotechnology in Engineering","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116636325","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

Residual stress evaluation and fatigue life prediction in the welded joint by x-ray diffraction 用x射线衍射评价焊接接头残余应力及疲劳寿命预测

International Conference on Smart Materials and Nanotechnology in Engineering Pub Date : 2009-10-20 DOI: 10.1117/12.843408

K. Yoo, K. Hwang, J. Chang, Jae Hoon Kim

{"title":"Residual stress evaluation and fatigue life prediction in the welded joint by x-ray diffraction","authors":"K. Yoo, K. Hwang, J. Chang, Jae Hoon Kim","doi":"10.1117/12.843408","DOIUrl":"https://doi.org/10.1117/12.843408","url":null,"abstract":"In the fossil power plant, the reliability of the components which consist of the many welded parts depends on the quality of welding. The residual stress is occurred by the heat flux of high temperature during weld process. This decreases the mechanical properties as the strength of fatigue and fracture. The residual stress of the welded part in the recently constructed power plants has been the cause of a variety of accidents. The objective of this study is measurement of the residual stress and the full width at half maximum intensity (FWHM) by X-ray diffraction method and to estimate the feasibility of this application for fatigue life assessment of the high-temperature pipeline. The materials used for the study is P92 steel for the use of high temperature pipe on super critical condition. The test results were analyzed by the distributed characteristics of residual stresses and FWHM in x-ray diffraction intensity curve. Also, X-ray diffraction tests using specimens simulated low cycle fatigue damage were performed in order to analyze fatigue properties when fatigue damage conditions become various stages. As a result of X-ray diffraction tests for specimens simulated fatigue damages, we conformed that the ratio of the FWHM due to fatigue damage has linear relationship with fatigue life ratio algebraically. From this relationship, it was suggested that direct expectation of the life consumption rate was feasible.","PeriodicalId":339588,"journal":{"name":"International Conference on Smart Materials and Nanotechnology in Engineering","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116988072","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

Investigation on the performance of multi-quantum barriers in InGaN/GaN multi-quantum well light-emitting diodes InGaN/GaN多量子阱发光二极管中多量子势垒性能的研究

International Conference on Smart Materials and Nanotechnology in Engineering Pub Date : 2009-10-20 DOI: 10.1117/12.837319

Yeu-Jent Hu, Jiunn-Chyi Lee, Ya-Fen Wu

引用次数: 0

A study on preparation and mechanical properties of UHMWPE/nylon composite covered yarn 超高分子量聚乙烯/尼龙复合包覆纱的制备及力学性能研究

International Conference on Smart Materials and Nanotechnology in Engineering Pub Date : 2009-10-20 DOI: 10.1117/12.840350

Wei-hua Yao, J. Yeh, Wen-Li Chou, Y. Shu

{"title":"A study on preparation and mechanical properties of UHMWPE/nylon composite covered yarn","authors":"Wei-hua Yao, J. Yeh, Wen-Li Chou, Y. Shu","doi":"10.1117/12.840350","DOIUrl":"https://doi.org/10.1117/12.840350","url":null,"abstract":"The study is describing Nylon yarn, though with low weight (specific weight 1.14), good elongation and high strength (4.5~9.5 g/d). Through the combination of irregular section long staple fiber to reach the core yarn, spun from Nylon fiber and long filament fiber, not only has the advantages of Nylon product but also has it can be used for making army-bag which can enhance the abrasion resistance, low weight and coving yarn that has doubled yarn effect from yarn surface consisting of Nylon fiber and long filament fiber. We used a Hamel's Elasto Twister (hollow-spindle machine) to prepare the yarn samples for our study. During spinning, the spindle speed was kept the same, while yarn through put speed was varied to obtain different wrap twists (700, 800, 900, 1000 T/M). The wrapping yarn is Nylon yarn with different count (40, 70D) and core yarn is ultra-high molecular weight polyethylene (UHMWPE) filament with 375 deniers, respectively. The results revealed the covered yarn have good physical properties and will be good performance in army-bag and army uniform. Keywords: Nylon, abrasion resistance, UHMWPE, physical properties","PeriodicalId":339588,"journal":{"name":"International Conference on Smart Materials and Nanotechnology in Engineering","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129168721","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