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| 1 | Comparative Analysis of Wavelet Transform for Time-Frequency Analysis and Transient Localization in Structural Health Monitoring显示文摘A critical problem facing data collection in structural health monitoring,for instance via sensor networks,is how to extract the main components and useful features for damage detection.A structural dynamic measurement is more often a complex time-varying process and therefore,is prone to dynamic changes in time-frequency contents.To extract the signal components and capture the useful features associated with damage from such nonstationary signals,a technique that combines the time and frequency analysis and shows the signal evolution in both time and frequency is required.Wavelet analyses have proven to be a viable and effective tool in this regard.Wavelet transform(WT)can analyze different signal components and then comparing the characteristics of each signal with a resolution matched to its scale.However,the challenge is the selection of a proper wavelet since various wavelets with varied properties that are to analyze the same data may result in different results.This article presents a study on how to carry out a comparative analysis based on analytic wavelet scalograms,using structural dynamic acceleration responses,to evaluate the effectiveness of various wavelets for damage detection in civil structures.The scalogram’s informative time-frequency regions are examined to analyze the variation of wavelet coefficients and show how the frequency content of a signal changes over time to detect transient events due to damage.Subsequently,damage-induced changes are tracked with time-frequency representations.Towards this aim,energy distribution and sharing information are investigated.The undamaged and damaged simulated comparative results of a structure reveal that the damaged structure were shifted from the undamaged structure.Also,the Bump wavelet shows the best results than the others. | Ahmed Silik Mohammad Noori Wael A.Altabey Ramin Ghiasi Zhishen Wu | 2021 | Structural Durability & Health Monitoring2021，15，1： | 4 |
| 2 | Strain Transfer Mechanism of Grating Ends Fiber Bragg Grating for Structural Health Monitoring显示文摘The grating ends bonding fiber Bragg grating(FBG)sensor has been widely used in sensor packages such as substrate type and clamp type for health monitoring of large structures.However,owing to the shear deformation of the adhesive layer of FBG,the strain measured by FBG is often different from the strain of actual matrix,which causes strain measurement errors.This investigation aims at improving the measurement accuracy of strain for the grating ends surface-bonded FBG.To fulfill this objective,a strain transfer equation of the grating ends bonding FBG is derived,and a theoretical model of the average strain transfer from the matrix to the optical fiber is developed.Moreover,parameters that influence the average strain transfer rate from the matrix to the optical fiber are analyzed.A selection scheme of bonding parameters by numerical simulation is provided,which is significantly advantageous over that of the grating bonding FBG.The theoretical equation is verified by finite element method(FEM).Compared with the existing model,the proposed model has higher measurement accuracy.Experimental tests are performed to validate the effectiveness of the proposed model on the equalintensity cantilever beam,whose surface is attached to the bare FBG with grating ends bonding and strain gauge by using epoxy glue.The results show that there is a great agreement between the outcome of the bare FBG and that of the strain gauge,and the corrected strain is closer to the true strain.The proposed model provides a theoretical basis for the design of the grating ends surface-bonded FBG strain sensor for health monitoring of large structures. | Guang Chen Keqin Ding Qibo Feng Xinran Yin Fangxiong Tang | 2019 | Structural Durability & Health Monitoring2019，13，3： | 4 |
| 3 | Using vibration phase space topology changes for structural damage detection显示文摘 | Zhenhua Nie Hong Hao Hongwei Ma | 2012 | Structural Health Monitoring2012，，5： | 2 |
| 4 | Passive and hybrid control systems for seismic protection of a benchmark cable-stayed bridge 显示文摘 | He W L Aqrawal A K | 2007 | Structural Control and Health Monitoring2007，14，1： | 1 |
| 5 | Testing and modelling a semi-actively controlled steel frame structure equipped with MR dampers 显示文摘 | RENZI E SERINO G | 2004 | Structural Control and Health Monitoring2004，11，3： | 1 |
| 6 | Development of distributed long-gage fiber optic sensing system for structural health monitoring 显示文摘 | Li S Z Wu Z S | 2007 | Structural Health Monitoring2007，6，2： | 1 |
| 7 | Experimental Damage Identification of Carbon/Epoxy Composite Beams Using Curvature Mode Shapes 显示文摘 | Hamey C S Lestari W Qiao P Z | 2004 | Structural Health Monitoring2004，3，4： | 1 |
| 8 | Structural Mechanism of Traditional Wooden Frames by Dynamic and Static Tests显示文摘 | Suzuki Y Maeno M | 2006 | Structural Control and Health Monitoring2006，13，： | 1 |
| 9 | Structural health monitoring in mainland China: review and future trends 显示文摘 | OU Jin-ping LI Hui | 2010 | Structural Health Monitoring2010，9，3： | 1 |
| 10 | Optimal dynamic inversion-basedsemi-active control of benchmark bridge using MR dampers显示文摘 | Ali S F Ramaswamy A | 2009 | Structural Control and Health Monitoring2009，16，5： | 1 |
| 11 | Damage detection of reinforced concrete beams with novel distributed crack/strain sensors 显示文摘 | Chen G Mu H M | 2004 | Structural Health Monitoring2004，3，3： | 1 |
| 12 | Integrated design of inelastic controlled structural systems 显示文摘 | Cimellaro G P Soong T T Reinhorn A M | 2009 | Structural Control Health Monitoring2009，16，78： | 1 |
| 13 | A Study of Safety Evaluation and Early-warning Method for Dam Global Behavior显示文摘 | SU Huai-zhi HU Jiang WU Zhong-ru | 2012 | Structural Health Monitoring2012，11，3： | 1 |
| 14 | Fluid-induced rotordynamic forces and instabilities显示文摘 | BRENNEN C E ACOSTA A J | 2006 | Structural Control and Health Monitoring2006，13，： | 1 |
| 15 | Monitoring Temperature Effect on a Long Suspension Bridge显示文摘 | Xu Y L Chen B Ng C L | 2009 | Structural Control and Health Monitoring2009，16，： | 1 |
| 16 | Experimental verification and numerical studies of an autonomous semi-active seismic control strategy显示文摘 | IEMURA H IGARASHI A KALANTARI A | 2006 | Structural Control and Health Monitoring2006，13，1： | 1 |
| 17 | Analytical and experimental investigations of disc brake noise using the frequency - time domain 显示文摘 | Beloiu D M Ibrahim R A | 2006 | Structural Control and Health Monitoring2006，13，1： | 1 |
| 18 | Vibration-Based Damage Identification Methods A Review and Comparative Study 显示文摘 | FAN Wei QIAO Pizhong | 2011 | Structural Health Monitoring2011，10，1： | 1 |
| 19 | Mechanical Behaviors and Deformation Properties of Retaining Wall Formed by Grouting Mould-Bag Pile显示文摘The simplified mechanical model and finite element model are established on the basis of the measured results and analysis of the grouting pile deformation monitoring,surface horizontal displacement and vertical displacement monitoring,deep horizontal displacement(inclinometer)monitoring,soil pressure monitoring and seepage pressure monitoring in the lower reaches of Wuan River regulation project in Shishi,Fujian Province.The mechanical behavior and deformation performance of mould-bag pile retaining wall formed after controlled cement grouting in the silty stratum of the test section are analyzed and compared.The results show that the use of controlled cement grouting mould-bag pile technology is to strengthen the soft stratum for sealing water and reinforcement,so that it can rock into a retaining wall,which can both retain soil and seal water with excellent effect.The control of cement grouting technology not only makes the soft soil rock in the range of retaining wall of mould-bag pile,but also makes a wide range of soil around the mould-bag pile squeeze and embed to compaction;and its cohesion and internal friction angle increased,so as to achieve the purpose of reducing soil pressure and improving mechanical and deformation properties of retaining wall. | Shengcai Li Jun Tang Lin Guo | 2019 | Structural Durability & Health Monitoring2019，13，1： | 1 |
| 20 | Improved damage detection of beam-type structures using uniform load surface显示文摘 | Wang J L Qiao P Z | 2007 | Structure Health Monitor2007，6，2： | 1 |
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