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  Subjects -> ENERGY (Total: 242 journals)
    - ENERGY (160 journals)
    - ENERGY: GENERAL (8 journals)
    - NUCLEAR ENERGY (20 journals)
    - PETROLEUM AND GAS (48 journals)
    - WIND ENERGY (6 journals)

ENERGY (160 journals)                  1 2 | Last

Advances in Building Energy Research     Hybrid Journal   (Followers: 10)
Advances in High Energy Physics     Open Access   (Followers: 12)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 13)
American Journal of Energy Research     Open Access   (Followers: 3)
Annals of Nuclear Energy     Hybrid Journal   (Followers: 6)
Annual Reports on NMR Spectroscopy     Full-text available via subscription   (Followers: 1)
Annual Review of Resource Economics     Full-text available via subscription   (Followers: 10)
Applied Nanoscience     Open Access   (Followers: 8)
Applied Solar Energy     Hybrid Journal   (Followers: 9)
Archives of Thermodynamics     Open Access   (Followers: 3)
Atomic Energy     Hybrid Journal   (Followers: 4)
Atoms for Peace: an International Journal     Hybrid Journal   (Followers: 2)
Biofuels     Hybrid Journal   (Followers: 7)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 5)
Bulletin de droit nucleaire     Full-text available via subscription   (Followers: 1)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 12)
Canadian Water Resources Journal     Hybrid Journal   (Followers: 17)
Carbon Management     Hybrid Journal   (Followers: 5)
Catalysis for Sustainable Energy     Open Access   (Followers: 1)
Chain Reaction     Full-text available via subscription  
Clefs CEA     Full-text available via subscription   (Followers: 1)
Computational Water, Energy, and Environmental Engineering     Open Access   (Followers: 1)
Continental Journal of Renewable Energy     Open Access   (Followers: 8)
Current Sustainable/Renewable Energy Reports     Hybrid Journal   (Followers: 1)
Dams and Reservoirs     Hybrid Journal   (Followers: 2)
Development of Energy Science     Open Access   (Followers: 1)
Distributed Generation & Alternative Energy Journal     Hybrid Journal   (Followers: 1)
E3S Web of Conferences     Open Access  
Economics and Policy of Energy and the Environment     Full-text available via subscription  
Electrical and Power Engineering Frontier     Open Access   (Followers: 7)
Electronic Journal of Energy & Environment     Open Access   (Followers: 7)
Energy     Partially Free   (Followers: 18)
Energy & Fuels     Full-text available via subscription   (Followers: 22)
Energy and Buildings     Hybrid Journal   (Followers: 6)
Energy and Environment Research     Open Access   (Followers: 8)
Energy and Power Engineering     Open Access   (Followers: 6)
Energy Conversion and Management     Hybrid Journal   (Followers: 6)
Energy Efficiency     Hybrid Journal   (Followers: 9)
Energy Materials: Materials Science and Engineering for Energy Systems     Hybrid Journal   (Followers: 15)
Energy Policy     Partially Free   (Followers: 35)
Energy Prices and Taxes     Full-text available via subscription   (Followers: 4)
Energy Procedia     Open Access   (Followers: 2)
Energy Science & Engineering     Open Access   (Followers: 3)
Energy Science and Technology     Open Access   (Followers: 9)
Energy Strategy Reviews     Partially Free   (Followers: 4)
Energy Studies Review     Open Access   (Followers: 3)
Energy Systems     Hybrid Journal   (Followers: 8)
Energy Technology     Partially Free   (Followers: 2)
Energy, Sustainability and Society     Open Access   (Followers: 14)
Environmental Progress & Sustainable Energy     Hybrid Journal   (Followers: 3)
EPJ Photovoltaics     Open Access  
Frontiers in Energy     Hybrid Journal   (Followers: 2)
Frontiers in Energy Research     Open Access  
Fuel and Energy Abstracts     Full-text available via subscription   (Followers: 5)
Functional Materials Letters     Hybrid Journal   (Followers: 1)
Gcb Bioenergy     Hybrid Journal   (Followers: 2)
Geothermal Energy     Open Access  
GeoWorld     Full-text available via subscription   (Followers: 2)
Green     Full-text available via subscription   (Followers: 1)
IEA Electricity Information     Full-text available via subscription   (Followers: 5)
IEA Natural Gas Information     Full-text available via subscription   (Followers: 4)
IEEE Power and Energy     Full-text available via subscription   (Followers: 8)
IEEE Transactions on Energy Conversion     Hybrid Journal   (Followers: 6)
IEEE Transactions on Nuclear Science     Hybrid Journal   (Followers: 7)
IEEE Transactions on Power Systems     Hybrid Journal   (Followers: 9)
IET Power Electronics     Hybrid Journal   (Followers: 7)
IngenierĂ­a EnergĂ©tica     Open Access  
Innovations : Technology, Governance, Globalization     Hybrid Journal   (Followers: 6)
International Journal of Alternative Propulsion     Hybrid Journal   (Followers: 1)
International Journal of Ambient Energy     Hybrid Journal   (Followers: 2)
International Journal of Applied Power Engineering     Open Access  
International Journal of Clean Coal and Energy     Open Access   (Followers: 3)
International Journal of Critical Infrastructure Protection     Hybrid Journal   (Followers: 5)
International Journal of Electric and Hybrid Vehicles     Hybrid Journal   (Followers: 3)
International Journal of Emerging Electric Power Systems     Full-text available via subscription   (Followers: 4)
International Journal of Emerging Multidisciplinary Fluid Sciences     Full-text available via subscription  
International Journal of Energy and Environmental Engineering     Open Access   (Followers: 2)
International Journal of Energy and Power     Open Access   (Followers: 4)
International Journal of Energy Engineering     Open Access   (Followers: 10)
International Journal of Energy Research     Hybrid Journal   (Followers: 8)
International Journal of Energy Science     Open Access   (Followers: 1)
International Journal of Flow Control     Full-text available via subscription   (Followers: 2)
International Journal of Global Energy Issues     Hybrid Journal   (Followers: 7)
International Journal of Green Energy     Hybrid Journal   (Followers: 5)
International Journal of Hydrogen Energy     Partially Free   (Followers: 8)
International Journal of Marine Energy     Full-text available via subscription   (Followers: 1)
International Journal of Nuclear Desalination     Hybrid Journal   (Followers: 2)
International Journal of Nuclear Energy Science and Technology     Hybrid Journal   (Followers: 1)
International Journal of Nuclear Governance, Economy and Ecology     Hybrid Journal   (Followers: 2)
International Journal of Nuclear Hydrogen Production and Applications     Hybrid Journal   (Followers: 2)
International Journal of Nuclear Knowledge Management     Hybrid Journal   (Followers: 1)
International Journal of Power and Energy Conversion     Hybrid Journal   (Followers: 3)
International Journal of Regulation and Governance     Hybrid Journal   (Followers: 2)
International Journal of Sustainable Energy     Hybrid Journal   (Followers: 8)
International Journal of Sustainable Energy Planning and Management     Open Access  
International Journal of Sustainable Engineering     Hybrid Journal   (Followers: 7)
International Journal of Thermodynamics     Open Access   (Followers: 2)
ISRN Power Engineering     Open Access   (Followers: 1)
Journal of Alternate Energy Sources & Technologies     Full-text available via subscription   (Followers: 1)
Journal of Building Performance Simulation     Hybrid Journal   (Followers: 3)

        1 2 | Last

Journal Cover Structural Control and Health Monitoring
   [6 followers]  Follow    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
     ISSN (Print) 1545-2255 - ISSN (Online) 1545-2263
     Published by John Wiley and Sons Homepage  [1602 journals]   [SJR: 1.148]   [H-I: 21]
  • Localization of acoustic emission sources in structural health monitoring
           of masonry bridge
    • Authors: Qinghua Han; Jie Xu, Alberto Carpinteri, Giuseppe Lacidogna
      Pages: n/a - n/a
      Abstract: The application of the acoustic emission (AE) technique to monitoring the crack characterization in masonry structures is investigated in this paper. An improved approach, modified from the classical crack source localization method, is proposed to provide more reliable crack locations in masonry structures. The introduced parameter, degree of inhomogeneity ξ in the modified method, can help to decrease the unavoidable propagation delay related to refraction due to the layers in masonry material. The modified method is successfully applied to the AE source detection during the pencil-lead break test and the central pier settlement test of a masonry model bridge to analyze the crack pattern. It is shown that the proposed method is a reliable tool for crack source location in masonry structures. Copyright © 2014 John Wiley & Sons, Ltd.
      PubDate: 2014-06-13T00:27:47.547722-05:
      DOI: 10.1002/stc.1675
       
  • Optical fiber-based sensors with flexible encapsulation for pavement
           behavior monitoring
    • Authors: Wanqiu Liu; Huaping Wang, Zhi Zhou, Xiaoying Xing, Dandan Cao, Zhen Jiang
      Pages: n/a - n/a
      Abstract: Owing to the increasing needs for robust highway pavement structural monitoring tools with high accuracy and functionality, this paper introduces some results from the research on developing optical fiber-based pavement behavior monitoring sensors. A new flexible encapsulation technique for optical fiber sensing element has been proposed to help the sensor withstand the harsh working environment and guarantee measuring accuracy. Both fiber Bragg grating and Brillouin optical time domain analysis/reflectometry-based sensors have been produced in a lab with the proposed encapsulation for high accuracy and distributed measurement, respectively. The precision of the fiber Bragg grating-based sensor has been specially calibrated in a lab. Lab and field tests have been carried out to study the effectiveness of the proposed sensors. It has been found that the proposed sensors have high survival rate (>75%) and are efficient for pavement structural behavior monitoring and damage detection. Copyright © 2014 John Wiley & Sons, Ltd.
      PubDate: 2014-06-05T00:27:57.9533-05:00
      DOI: 10.1002/stc.1674
       
  • Issue Information
    • Pages: i - ii
      Abstract: No abstract is available for this article.
      PubDate: 2014-06-02T20:57:00.565168-05:
      DOI: 10.1002/stc.1613
       
  • Inference of bond slip in prestressed tendons in concrete bridge girders
    • Authors: Siu Chun M. Ho; Liang Ren, Emad Labib, Aadit Kapadia, Yi-Lung Mo, Hongnan Li, Gangbing Song
      Pages: n/a - n/a
      Abstract: Prestressed concrete (PC) bridge girders have extra flexural strength due to embedded prestressing tendons. The level of strength depends on the integrity of the concrete-tendon bond in pretensioned PC structures, and this bond can be degraded in the presence of an adequately large mechanical force or over time because of accumulated damage. Bond degradation is characterized by the bond slip of the tendon from the host concrete, and in regards to PC structures, bond slip has only been measured from a global perspective. In this paper, a novel method was developed to measure for the first time the local strain of a prestressing tendon during bond slip. Fiber Bragg grating-based strain sensors were installed directly onto prestressing tendons within a PC girder to provide a local perspective of bond slip as the girder was loaded to failure. Measurement of the local strains in selected tendons, from the beginning of bond slip to the complete loss of the concrete-tendon bond, and the failure of the girder was enabled by the method. Copyright © 2014 John Wiley & Sons, Ltd.
      PubDate: 2014-06-02T20:07:43.265258-05:
      DOI: 10.1002/stc.1669
       
  • Nonlinear data-driven computational models for response prediction and
           change detection
    • Authors: Armen Derkevorkian; Miguel Hernandez-Garcia, Hae-Bum Yun, Sami F. Masri, Peizhen Li
      Pages: n/a - n/a
      Abstract: Data are used from three relatively large-scale experimental soil-foundation-superstructure interaction (SFSI) systems to develop reduced-order computational models for response prediction and change-detection relevant to structural health monitoring and computational mechanics. The three systems under consideration consist of identical superstructures with: (i) fixed base; (ii) box foundation; and (iii) pile foundation. The three SFSI systems were developed and experimentally tested at Tongji University. In the first part of the study, a computational time-marching prediction framework is proposed by incorporating trained neural network(s) within an ordinary differential equation solver and dynamically predicting the response (i.e., displacement and velocity) of the SFSI systems to various earthquake excitations. Two approaches are investigated: global approach and subsystem approach. Both approaches are tested and validated with linear and nonlinear systems, and their respective pros and cons are discussed. In the second part of the study, the trained neural networks from the global approach are further used for change-detection in the SFSI systems. The detected changes in the systems are then quantified through a measure of a normalized error index. Challenges related to the physical interpretation of the quantified changes in the SFSI systems are addressed and discussed. It is shown that the general procedures adopted in this paper provide a robust nonlinear model that is reliable for computational studies, as well as furnishing a robust tool for detecting and quantifying inherent change in the system. Copyright © 2014 John Wiley & Sons, Ltd.
      PubDate: 2014-05-30T01:55:40.559884-05:
      DOI: 10.1002/stc.1673
       
  • System identification of a historic swing truss bridge using a wireless
           sensor network employing orientation correction
    • Authors: Soojin Cho; Ryan K. Giles, Billie F. Spencer
      Pages: n/a - n/a
      Abstract: System identification was performed on the swing span of a steel truss bridge dating from 1896 using acceleration data collected from a wireless sensor network (WSN). The swing span can rotate 360° to allow river traffic to pass through the locks located under the bridge. The WSN installed on the swing span consists of 23 nodes that measure synchronized tri-axial acceleration. Five days of measured data were segmented according to three functional positions of the span (locked facing downstream, locked facing upstream, swung for river traffic) and load conditions. Subsequently, the modal parameters corresponding to the bridge's three functional positions were obtained using frequency domain decomposition method. The initial system identification of the bridge resulted in significant anomalies, in comparison with the finite element (FE) model. To improve the accuracy of the overall identification results, the sensor orientation correction technique is proposed for the measured data from the WSN. The improvement has been verified by comparing the orientation-corrected mode shapes with non-corrected mode shapes and FE mode shapes using the modal assurance criterion values. Analysis of the modal parameters inferred that the boundary conditions for the bridge positions are different because of the interaction of the locking mechanism with the abutments in those positions. The proposed approach for system identification, including sensor orientation correction, is to be used as part of the comprehensive structural heath monitoring strategy for this historic structure. Copyright © 2014 John Wiley & Sons, Ltd.
      PubDate: 2014-05-30T01:11:21.812753-05:
      DOI: 10.1002/stc.1672
       
  • Performance of fiber-reinforced elastomeric base isolators under cyclic
           excitation
    • Authors: Animesh Das; Anjan Dutta, Sajal K. Deb
      Pages: n/a - n/a
      Abstract: This paper presents three-dimensional finite element models for the analysis of square fiber-reinforced elastomeric isolators (FREI) subjected to cyclic horizontal displacement and constant vertical load. Direction of applied displacement has been varied to evaluate their influence on the isolator performance. Both bonded and un-bonded boundary conditions at the top and bottom contact surfaces of isolator have been simulated in the analysis. It is observed that the un-bonded FREI are more effective in seismic isolation as compared with bonded FREI, and stresses developed under lateral displacement are also significantly lower in un-bonded FREI. Experimental validation has been carried out for un-bonded isolators and very good agreement is observed in terms of mechanical properties and deformed configuration. In the absence of any close form solution of un-bonded FREI due to its complex deformation pattern, finite element solution is observed to be sufficiently accurate for arriving at the design parameters of an isolator. Copyright © 2014 John Wiley & Sons, Ltd.
      PubDate: 2014-05-21T01:15:11.81426-05:0
      DOI: 10.1002/stc.1668
       
  • Optimal design of distributed tuned mass dampers for passive vibration
           control of structures
    • Authors: F. Yang; R. Sedaghati, E. Esmailzadeh
      Pages: n/a - n/a
      Abstract: The distributed tuned mass damper (DTMD) system consists of multiple tuned mass dampers, which are designed to suppress the undesirable structural vibration over a bandwidth centered at a particular tuned frequency. In this study, an innovative practical approach to optimally design the DTMD system has been proposed. Comparisons were made between the optimal DTMD system, obtained based on the proposed design approach, and those using the conventional design approach. The superior performance and robustness of the optimally designed DTMD system based on the proposed approach compared with that based on the conventional approach have been demonstrated through illustrative examples. It has been shown that the proposed design approach provide a simple, clear, and straightforward way to effectively attain the optimum parameters of the DTMD system. Copyright © 2014 John Wiley & Sons, Ltd.
      PubDate: 2014-05-21T01:12:10.595634-05:
      DOI: 10.1002/stc.1670
       
  • Amplitude and frequency independent cable damping of Sutong Bridge and
           Russky Bridge by magnetorheological dampers
    • Authors: Felix Weber; Hans Distl
      Pages: n/a - n/a
      Abstract: Two control approaches for magnetorheological (MR) dampers on cables based on collocated control without state estimation are formulated, which generate amplitude and frequency independent cable damping: cycle energy control and controlled viscous damping (CVD). The force tracking is solved by the inverted Bingham model whose parameters are fitted as function of current and frequency. Cycle energy control and CVD are experimentally validated by hybrid simulations and free decay tests on stay cables of the Sutong Bridge, China, and the Eiland Bridge, the Netherlands. The implementation of CVD on the Russky Bridge, Russia, includes two novelties: the force tracking also takes the actual MR damper temperature into account to ensure precise force tracking for MR damper temperatures −40 to +60 °C and the decentralised real-time control units with pulse width current modulation are installed next to each MR damper to avoid long direct current (DC) power lines with associated losses and thereby minimise power consumption. Copyright © 2014 John Wiley & Sons, Ltd.
      PubDate: 2014-05-21T00:42:33.391893-05:
      DOI: 10.1002/stc.1671
       
  • Fuzzy logic control of a stiffness-adaptable seismic isolation system
    • Authors: Tzu-Kang Lin; Lyan-Ywan Lu, Hsun Chang
      Pages: n/a - n/a
      Abstract: Traditional passive isolation systems have been shown to provide satisfactory seismic mitigation performance under typical far-field earthquake conditions. However, because of the untunable designated isolation period, the performance of these systems is still strongly affected by the low-frequency resonance phenomenon observed during near-fault earthquakes, which are usually dominated by a long-duration impulse. The use of semi-active isolation systems with variable stiffness, which are usually equipped with a customized control algorithm to determine the isolation stiffness or period in real time, could be a promising solution to overcome this problem. To realize this technology, this study develops a smart isolation system that combines the leverage-type stiffness-controllable isolation system (LSCIS) with a simple fuzzy logic control (FLC). Because the proposed FLC merely requires feedback from the velocity and displacement responses of the isolation base, it is quite easily implemented. Theoretical analysis shows that the extreme displacement of the isolation level caused by near-fault seismic waves can be mitigated by the proposed system with tolerable acceleration response variations compared with that of the traditional passive isolation system. The movement of the pivot point of the LSCIS can also be adjusted to address the inherent hardware constraint that limits its practical application. Experimental verification conducted on a shake table further demonstrates the feasibility of integrating the LSCIS system with FLC after proper consideration of the friction effect generated by the leverage mechanism and the inevitable time delay effect. Copyright © 2014 John Wiley & Sons, Ltd.
      PubDate: 2014-05-15T02:48:38.057729-05:
      DOI: 10.1002/stc.1667
       
  • Passive control of floating offshore wind turbine nacelle and spar
           vibrations by multiple tuned mass dampers
    • Authors: Van-Nguyen Dinh; Biswajit Basu
      Pages: n/a - n/a
      Abstract: This paper investigates the use of single and multiple tuned mass dampers (TMDs) for passive control of edgewise vibrations of nacelle/tower and spar of spar-type floating wind turbines (S-FOWTs). Uncontrolled and controlled mathematical models of the S-FOWT are developed by using Euler-Lagrangian energy formulations. In these models, the aerodynamic properties of the blade, variable mass and stiffness, gravity, the interactions among the blades, nacelle, spar and mooring system, the hydrodynamic effects, the restoring moment, and the buoyancy force are considered. The vibrations of the blades, nacelle, tower, and spar are coupled in all degrees of freedom and in all inertial, dissipative, and elastic components. In the controlled model, several set of horizontal TMDs are placed in the spar at various depths and the coupling of these TMDs with the nacelle and spar motions is considered. The control effectiveness is evaluated by the reduction of the root-mean-square and maximum response. The control feasibility is examined by using the spar sinking and the TMD maximum strokes. The investigations using nonlinear time–domain simulation show that a single TMD can reduce up to 40% of the nacelle sway displacement and the spar roll, and that the reduction observed with multiple TMDs is 50%. The influence of the spar TMD is more significant than that of the nacelle TMD. The spar TMDs are less effective when their positions are lower. In all the cases studied, good heave performance of the S-FOWT is maintained. Copyright © 2014 John Wiley & Sons, Ltd.
      PubDate: 2014-05-15T01:55:11.246845-05:
      DOI: 10.1002/stc.1666
       
  • Retest of Neoprene seismic isolation bearings after 30 years
    • Authors: Niel C. Van Engelen; James M. Kelly
      Pages: n/a - n/a
      Abstract: This paper describes the retest of a set of Neoprene (Polychloroprene) steel reinforced elastomeric isolator bearings that were originally tested as part of an experimental program in 1981. The original bearings were tested on a shake table as a demonstration of the feasibility of base isolation for the seismic protection of buildings. Two types of bearings were provided, and not all were used. The unused bearings were stored unloaded at room temperature for over 30 years. Although there has been a very substantial improvement in the number and quality of the instrumentation available to the test program over the span of 30 years, it is possible to compare the results of relatively similar shake table tests on the bearings. The shake table tests are used to assess the changes in the horizontal stiffness and damping values for the bearings over this period. Copyright © 2014 John Wiley & Sons, Ltd.
      PubDate: 2014-05-08T01:30:31.988429-05:
      DOI: 10.1002/stc.1665
       
  • Health monitoring sensor placement optimization for Canton Tower using
           immune monkey algorithm
    • Authors: Ting-Hua Yi; Hong-Nan Li, Xu-Dong Zhang
      Pages: n/a - n/a
      Abstract: Sensor placement is an integral component in the design of an effective and reliable structural health monitoring system for large-scale civil engineering structures. In this paper, a novel hybrid optimization algorithm, that is, immune monkey algorithm (IMA), by combining the monkey algorithm with the immune algorithm, is proposed to solve the optimal sensor placement problem. In the proposed algorithm, the dual-structure coding method is designed and adopted for the representation of design variables and a chaos-based approach is presented to initialize the monkey population. In addition, some improved strategies such as the advanced climb process, immune selection, clonal proliferation, and immune renewal are defined to maintain population diversity and inhibit degeneracy during evolution. The effectiveness and reliability of the proposed IMA is demonstrated by designing the sensor arrays of the Canton Tower, the second highest TV tower in the world. Numerical investigations presented clearly suggest that the proposed hybrid IMA outperforms the original monkey algorithm implementations both in terms of generating optimal solutions as well as faster convergence. The proposed algorithm can easily be extended to other multiple global optimization problems. Copyright © 2014 John Wiley & Sons, Ltd.
      PubDate: 2014-04-29T00:30:25.367951-05:
      DOI: 10.1002/stc.1664
       
  • Shaking table investigation of a novel, low-cost, base isolation
           technology using recycled rubber
    • Authors: Andrea Calabrese; Mariacristina Spizzuoco, Giorgio Serino, Gaetano Della Corte, Giuseppe Maddaloni
      Abstract: This paper details the findings of an experimental program that assessed the seismic performances of a novel low-cost base isolation device. The proposed bearings are referred to as recycled rubber–fiber-reinforced bearings (RR-FRBs). Devices composed of a low-cost recycled elastomer and reinforced with fiber sheets were manufactured and tested. The main revolutionary concepts investigated in this study are as follows: low-performance elastomers can be used to produce rubber isolators, and vulcanization can be prevented by bonding different layers with an elastic compound. This study addresses all design and technical aspects related to the implementation of the proposed base isolation system. Shaking table tests showed a significant improvement in the seismic performance of an RR-FRB isolated building with respect to a corresponding fixed-base structure. Copyright © 2014 John Wiley & Sons, Ltd.
      PubDate: 2014-04-27T22:49:08.803865-05:
      DOI: 10.1002/stc.1663
       
  • New damage indices and algorithm based on square time–frequency
           distribution for damage detection in concrete piers of railroad bridges
    • Authors: H. R. Ahmadi; F. Daneshjoo, N. Khaji
      Abstract: This paper presents a new algorithm based on square time–frequency distribution to detect damages in concrete piers of railroad bridges. In addition, two new damage indices are proposed in this research. The algorithm and damage indices are described and corroborated using finite element model of Qotour railroad bridge. To create the finite element model according to the current condition of the Qotour railroad bridge, extensive in situ measurement results and laboratory tests were used. Some seismic damages were considered in the concrete piers of the model. The results indicate that the algorithm and damage indices can identify all damages from severe to small accurately. The proposed algorithm and damage indices are shown to be not sensitive to noise and even in case of noise-polluted response signal are working properly. The proposed algorithm only uses the response signals without the need for recording the excitation forces. In addition, according to the algorithm, there is no need to create an analytical model of the bridge for damage detection. This feature in modeling of bridge structures and especially complex bridge, which is associated with problems, is very useful. Copyright © 2014 John Wiley & Sons, Ltd.
      PubDate: 2014-04-27T22:27:05.689316-05:
      DOI: 10.1002/stc.1662
       
  • Seismic response analyses of an asymmetric base-isolated building during
           the 2011 Great East Japan (Tohoku) Earthquake
    • Authors: Dionysius M. Siringoringo; Yozo Fujino
      Abstract: Analysis of strong motion recordings of a base-isolated building during the March 11, 2011, Great East Japan (Tohoku) Earthquake is reported in this paper. The building, located in Tokyo Bay area, is an asymmetric L-shaped structure consisting of seven-story and 14-story building with vertical opening. Vibration monitoring system was installed on the building in 2010, and seismic responses were recorded including the strongest shaking (peak ground acceleration 0.80–1.40 m/s2) experienced during the main shock of March 11, 2011, Great East Japan Earthquake. The building survived the earthquake without structural damage. The study in this paper includes response analysis, system identification, and seismic performance evaluation of the structure, especially performance of base-isolation system. The study shows that despite considerable shift in effective frequency of the building due to the increase in flexibility of isolation system during the main shock, large acceleration was recorded on the superstructure with the peak floor accelerations of nearly 300 cm/s2. Two factors contribute to this cause: one is the characteristics of the building where torsional modes dominate the seismic response of upper stories and the other is resonance, where dominant frequencies of ground motions coincide with the natural frequencies of torsional modes. Moreover, analysis shows that torsional modes were not significantly influenced by performance of base isolation, so that even though the base isolation has functioned properly, the upper stories still experienced large floor accelerations. The paper also discusses long-term observation of seismic responses during aftershocks and various levels of earthquakes between 2010 and 2012. Copyright © 2014 John Wiley & Sons, Ltd.
      PubDate: 2014-04-11T00:41:15.630181-05:
      DOI: 10.1002/stc.1661
       
  • Automatic baseline correction of strain gauge signals
    • Authors: Shengfa Miao; Eddy Koenders, Arno Knobbe
      Abstract: Considerable research effort has been devoted to distinguishing changes caused by the environmental variability from changes due to structural damage, but unfortunately, investigations studying the operational variability, such as traffic events, have been lacking. In order to obtain signals of high quality, we need to deal with baseline drift problems mainly caused by temperature changes and traffic jams. In this paper, we present a new baseline correction method, the most-crossing method, to deal with the baseline of the strain signals collected from a sensor network installed on a concrete bridge. It is a piece-wise method based on probability theory. This method needs only a few manual parameter selection and can be used automatically for real time baseline correction. We compare the performance of the most-crossing method with that of the first derivative method and the iterative polynomial method. The experimental results indicate that the most-crossing method is superior in dealing with civil engineering signals. Copyright © 2014 John Wiley & Sons, Ltd.
      PubDate: 2014-04-10T01:12:21.39225-05:0
      DOI: 10.1002/stc.1658
       
  • Railway infrastructure damage detection using wavelet transformed
           acceleration response of traversing vehicle
    • Authors: Daniel Cantero; Biswajit Basu
      Abstract: This paper proposes the use of vertical accelerations of a moving train to detect local track irregularities produced by weaker sections of the infrastructure. By analysing the vehicle accelerations using the wavelet transform, it is possible to clearly identify the location of damaged sections. A wavelet-based indicator is proposed to facilitate an algorithm for recognition of deteriorated segments. The proposed indicator is validated by means of a 2-DOF vehicle model excited by randomly generated track irregularities together with the presence of various local track defects. A Monte Carlo analysis is performed to evaluate the performance of the proposed indicator for a variety of model parameters, including vehicle mechanical properties, shape of isolated track irregularities and levels of damage. Copyright © 2014 John Wiley & Sons, Ltd.
      PubDate: 2014-04-10T01:09:26.440852-05:
      DOI: 10.1002/stc.1660
       
  • Ultrasonic guided waves for monitoring corrosion in submerged plates
    • Authors: Sandeep Sharma; Abhijit Mukherjee
      Abstract: This paper reports a non-contact, in-situ and non-destructive corrosion monitoring methodology for submerged plates using ultrasonic guided waves. Specific surface sensitive and core sensitive guided wave modes are utilized for monitoring plates undergoing accelerated impressed current corrosion in the presence of chlorides. A combination of the selected guided wave modes could effectively discern various corrosion mechanisms occurring in plates. Along with the ultrasonic signals, mass loss, stress–strain behaviour and tensile strength of the plates at different stages of corrosion have been monitored. Algebraic relationships between the ultrasonic readings and other parameters have been developed. This investigation should be useful in developing a non-destructive technique for monitoring progressive corrosion in plates and assessing their deterioration in strength, stiffness and mass loss that would help in the estimation of residual life. Copyright © 2014 John Wiley & Sons, Ltd.
      PubDate: 2014-04-04T00:10:26.847728-05:
      DOI: 10.1002/stc.1657
       
  • Application of artificial neural networks for compounding multiple damage
           indices in Lamb-wave-based damage detection
    • Authors: Ziemowit Dworakowski; Lukasz Ambrozinski, Pawel Packo, Krzysztof Dragan, Tadeusz Stepinski
      Abstract: This paper presents a novel approach to the problem of health monitoring of aircraft structures using Lamb waves. Piezoelectric sensors, embedded in the aircraft sheathing, generate Lamb waves with the aim to monitor the structural integrity of complex structure parts. The ultrasonic signals obtained from the sensor pairs arranged in pitch-catch configuration are used for the calculation of a number of different damage indices. The damage indices are then used as inputs for a classifier employing an artificial neural network (ANN) that is trained to perform structure condition assessment. Efficiency of the ANN classifier trained on artificial data generated from the numerical simulations performed using linear interaction simulation approach is investigated. The resulting classification results are compared with those obtained for the ANN trained on experimental data from the real specimens. Copyright © 2014 John Wiley & Sons, Ltd.
      PubDate: 2014-04-03T23:57:18.300917-05:
      DOI: 10.1002/stc.1659
       
  • Computationally efficient design of optimal strategies for controllable
           damping devices
    • Authors: Mahmoud Kamalzare; Erik A. Johnson, Steven F. Wojtkiewicz
      Abstract: The development of control strategies for controllable passive dampers — ‘semiactive’ damping devices — is complicated by the nonlinear and dissipative nature of the devices and the nonlinear nature of the closed-loop system with any form of parametric feedback control. Control design for nonlinear systems is often achieved by designing a control for a linearized model since strategies for linear systems are straightforward. One such approach is clipped-optimal control in which the desired damper forces are determined from an optimal controller (e.g., linear quadratic regulator, linear quadratic Gaussian, H2 and H∞), which is designed assuming that the damping devices are fully linear actuators that can exert any forces (dissipative or nondissipative), and a secondary bang–bang controller commands the controllable damper to exert forces as close as possible to the desired forces. However, designs using any linearized model generally result in suboptimal (and sometimes very poor) performance because the linear actuator assumption differs from the actual implementation with a dissipative damping device. Thus, one must generally resort to a large-scale parameter study in which the nonlinear system is simulated many times to determine control strategies that are actually optimal for the nonlinear controlled closed-loop system. This paper demonstrates how an approach developed by the authors, which can reduce the model of a system with local modifications to a lower order set of Volterra integral equations in the modification forces, can significantly decrease the computational burden of a complex control design study for controllable dampers. The approach is first adapted to use a state feedback control with a bang–bang on–off secondary controller. Then, the structural and damping device models are detailed. The optimal semiactive control design is demonstrated via both a parameter study and an optimization algorithm. Numerical examples demonstrate that the approach is effective and, compared with a conventional simulation approach, can reduce computation time by two orders of magnitude. Copyright © 2014 John Wiley & Sons, Ltd.
      PubDate: 2014-03-17T01:47:04.095831-05:
      DOI: 10.1002/stc.1649
       
  • Value of information: impact of monitoring on decision-making
    • Authors: Daniele Zonta; Branko Glisic, Sigrid Adriaenssens
      Pages: 1043 - 1056
      Abstract: Structural health monitoring (SHM) is a process aimed at providing accurate and in-time information concerning structural health condition and performance, which can serve as an objective basis for decision-making regarding operation, maintenance, and repair. However, at the current state of practice, SHM is less used on real structures, and one reason for this is the lack of understanding of the Value of Information obtained from SHM. Consequently, even when SHM is implemented, bridge managers often make decisions based on experience or common sense, frequently considering with reserve and sometimes disregarding the suggestions arising from SHM. Managers weigh the SHM results based on their prior perception of the state of the structure and the confidence that they have in the specific applied SHM system and then make decisions considering the perceived effects of the actions they can undertake. In order to address and overcome the aforementioned identified limitations in the use of the SHM, a rational framework for assessment of the impact of the SHM on decision-making is researched and proposed in this paper. The framework is based on the concept of Value of Information and demonstrated on the case study of the Streicker Bridge, a new pedestrian bridge on Princeton University campus. Copyright © 2013 John Wiley & Sons, Ltd.
      PubDate: 2013-12-01T23:36:00.914677-05:
      DOI: 10.1002/stc.1631
       
  • Application of sensor technologies for local and distributed structural
           health monitoring
    • Authors: C. Sbarufatti; A. Manes, M. Giglio
      Pages: 1057 - 1083
      Abstract: The work presented in this paper deals with the application of different sensor technologies for fatigue crack damage monitoring of metallic helicopter fuselages. A test programme has been conducted, consisting of seven fatigue crack propagation tests on aluminium panels (skin with riveted stringers) representative of the rear fuselage of a helicopter. Electrical crack gauges and comparative vacuum monitoring sensors have been used locally to monitor propagating cracks. A network of optical fibre Bragg gratings is presented as a valid possibility for distributed monitoring (based on strain field dependence on damage), alternative to consolidated electrical resistance-based strain gauges. A Smart Layer based on piezoelectric transducers that emit and receive Lamb wave signals has also been analysed in this paper for distributed monitoring. Two damages have been considered: a skin crack artificially initiated on a panel bay and a skin crack propagating from a rivet hole after stringer failure. Damage sensitivity has been evaluated and compared among the considered technologies, thus providing useful recommendations for each considered system, together with advantages and drawbacks concerning their suitability for on-board installation and monitoring. The damage index sensitivity to operative condition, load in particular, is verified and compared with damage effect for distributed networks. A finite element model able to describe any selected feature sensitivity to the monitored damage is also presented as a useful tool for the optimization of the structural health monitoring system design process. Copyright © 2013 John Wiley & Sons, Ltd.
      PubDate: 2013-12-09T06:40:20.193146-05:
      DOI: 10.1002/stc.1632
       
  • Design of viscous fluid passive structural control systems using pole
           assignment algorithm
    • Authors: A. R. Zare; M. Ahmadizadeh
      Pages: 1084 - 1099
      Abstract: A methodology is developed for the design of optimum viscous fluid passive energy dissipation systems using pole assignment active control algorithm. In this method, the procedure to assign the new structural poles is slightly modified such that the resulting structural properties (i.e., the optimum locations of system poles) can be achieved merely by modification of structural stiffness and addition of a passive control system. A combination of stiffness reduction and increase of damping is utilized to reduce both acceleration and displacement response. It is shown that the control systems designed using this method provide structural performances slightly better than or close to those of ordinarily designed optimum passive systems. Furthermore, by an educated selection of the locations of the structural poles, the proposed method provides more versatility in the design of passive control systems. Copyright © 2013 John Wiley & Sons, Ltd.
      PubDate: 2013-12-09T06:34:39.318324-05:
      DOI: 10.1002/stc.1633
       
  • Real-time identification of time-varying tension in stay cables by
           monitoring cable transversal acceleration
    • Authors: Hui Li; Fujian Zhang, Yizhou Jin
      Pages: 1100 - 1117
      Abstract: Stay cables are critical components in bridges. However, stay cables suffer from severe fatigue damage. Therefore, a monitoring technique to obtain the time history of the tension in stay cables is important. Because the acceleration of stay cables is readily measurable, approaches to identify cable tension based on frequency analysis and monitored cable acceleration have been widely investigated and used in practice. However, this type of approach can only identify a time-invariant tension of a stay cable over a specified duration, not the time-varying tension. This paper proposes an approach to identify the time-varying tension of stay cables by monitoring cable accelerations. The tension variation in stay cables is caused by vehicles passing over the bridge. The real-time identification algorithm that determines the time-varying tension of stay cables is proposed using an extended Kalman filter based on both the transversal monitored acceleration at a single location on the cable and the monitored wind speed on the bridge, where the time-varying tension is a state variable that is identified. A stay cable from the Nanjing Yangtze River No. 3 Bridge was used for the numerical study. The time-varying tension of the stay cable can be identified when either a single vehicle or multiple vehicles pass over the bridge. The robustness of the proposed approach is also investigated through deviations in the initial tension, initial displacement, and velocity of the stay cable. An experiment was conducted on a scaled stay cable with time-varying tension excited by wind. The time-varying cable tension of the cable was identified by the proposed approach and compared with the real time-varying cable tension. The identification accuracy and robustness of the proposed approach is verified through the experiment and numerical study. Copyright © 2013 John Wiley & Sons, Ltd.
      PubDate: 2013-12-17T05:03:39.488386-05:
      DOI: 10.1002/stc.1634
       
  • A low-noise, real-time, wireless data acquisition system for structural
           monitoring applications
    • Authors: Zhicong Chen; Fabio Casciati
      Pages: 1118 - 1136
      Abstract: Structural health monitoring systems are conceived to automatically monitor the structural health state in real-time. The high-cost and the labor intensive installation of wired monitoring system suggest that structural monitoring systems be realized of a wireless nature. This study explores the development of a general and high-performance wireless data acquisition system (WDAQS) specifically designed for sensors commonly adopted in structural health monitoring applications.When compared with wired sensor technology, wireless sensor technology suffers limited energy supply, long data collection delay, big noise floor, and data loss. Addressing these issues, in the design of the WDAQS, several features are pursued, including flexible sensor interfaces, high power efficiency, low-noise data acquisition, and real-time and lossless data transmissions. The design of the system is presented in detail in terms of hardware, firmware, and software. Several experiments are carried out to validate and evaluate the system. The results show that the WDAQS is able to acquire high-quality data. Copyright © 2013 John Wiley & Sons, Ltd.
      PubDate: 2013-12-17T05:02:58.731847-05:
      DOI: 10.1002/stc.1636
       
 
 
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