Topic
Structural health monitoring
About: Structural health monitoring is a research topic. Over the lifetime, 11727 publications have been published within this topic receiving 186231 citations.
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TL;DR: A hybrid piezoelectric/fiber optic diagnostic system has been developed for quick non-destructive evaluation and long term health monitoring of aerospace vehicles and structures as discussed by the authors, which consists of three major parts: a diagnostic layer with a network of pieziolectric elements and fiber gratings to offer a simple and efficient way to integrate a large network of transducers onto a structure; diagnostic hardware consisting of an arbitrary waveform generator and a high speed fiber grating demodulation unit together with a high-speed data acquisition card to provide actuation input, data collection,
Abstract: A hybrid piezoelectric/fiber optic diagnostic system has been developed for quick non-destructive evaluation and long term health monitoring of aerospace vehicles and structures. The hybrid diagnostic system uses piezoelectric actuators to input a controlled excitation to the structure and fiber optic sensors to capture the corresponding structural response. The system consists of three major parts: a diagnostic layer with a network of piezoelectric elements and fiber gratings to offer a simple and efficient way to integrate a large network of transducers onto a structure; diagnostic hardware consisting of an arbitrary waveform generator and a high speed fiber grating demodulation unit together with a high speed data acquisition card to provide actuation input, data collection, and information processing; and diagnostic software to determine the condition of the structure. This paper presents key development issues related to the manufacturing of the hybrid piezoelectric/fiber optic diagnostic layer and integration of a highly portable diagnostic hardware. Validation and proof testing of this integrated diagnostic system are also presented.
92 citations
TL;DR: An improved version of an approach based on Mel-frequency cepstral coefficients and principal component analysis (PCA) taking advantage of mobile sensor network is proposed to overcome the deficiencies in the approaches that utilize single measurement.
92 citations
01 Jul 2007
TL;DR: In this article, a multi-scale model of the Tsing Ma Bridge (TMB) was developed based on the design drawings and proposed strategies for multiscale modeling, in which local deterioration processes at welded details of interconnects are able to account for the major effect of the damage and nonlinear influence on structural response.
Abstract: This paper aims to develop an approach for multi-scale numerical analysis on structural dynamic response and local damage in long-span bridges. The strategies of finite element modeling of long-span bridges for multi-scale numerical analysis was first investigated. A multi-scale model of the Tsing Ma Bridge (TMB) was then developed based on the design drawings and proposed strategies for multi-scale modeling. The procedures for multi-scale numerical analysis on the dynamic response and local damage are proposed, in which local deterioration processes at welded details of interconnects are able to account for the major effect of the damage and nonlinear influence on structural response. The multi-scale computations are implemented based on the software ABAQUS and the developed programs via the user interface provided by the software for the purpose of easier application to large civil structures. The accuracy of the calculated procedures is addressed with two smaller controlled examples before the approach can be applied to the Tsing Ma Bridge. Based on the online monitoring data acquired from the Structural Health Monitoring (SHM) system installed on TMB, the global dynamic response of the bridge and local damage accumulation of two typical weld details in the longitudinal truss of TMB under traffic loading are numerically analyzed by using the developed model and computational procedures. The maximum value of the accumulated damage is found on the toe of the weld of the upper and/or bottom chords with the diagonal and gusset plate intersection. The fatigue life obtained from the fully coupled calculation is smaller than that from the uncoupled computation, which suggests that the significant interaction between the damage and the structural response should be considered in the structural damage analyses using the multi-scale numerical computation.
92 citations
TL;DR: In this paper, a state-of-the-art review of sensor technologies used for monitoring indicators pointing to pipe structural deterioration is presented, and the potential for multi-sensor system and sensor data fusion for condition-based maintenance is discussed.
Abstract: Advances in electronics, sensor technology, information science, electrical and computer engineering give rise to emerging technologies, some of which could be applied to the inspection, monitoring, and condition assessment of buried water mains. This paper presents a state of the review of sensor technologies used for monitoring indicators pointing to pipe structural deterioration. The potential for multi-sensor system and sensor data fusion for condition-based maintenance are also discussed.
92 citations
TL;DR: In this paper, a multi-scale model of the Tsing Ma Bridge (TMB) was developed based on the design drawings and proposed strategies for multiscale modeling, in which local deterioration processes at welded details of interconnects are able to account for the major effect of the damage and nonlinear influence on structural response.
92 citations