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High-Fidelity Model of the sandwich composite structure with real geometry is reported. The model includes two composite facesheets, honeycomb core, piezoelectric actuator/sensors, adhesive layers, and the impactor. The novel feature of the model is that it includes modeling of the impact and wave propagation in the structure before and after the impact. Results of modeling of the wave propagation,...
The optimal placement method of sensors is carried out based on improved genetic algorithm for solving the sensors optimal placement problem of the health monitoring system for long-span railway bridge. Dual structure coding method is introduced to improve the individual encoding method in the Genetic Algorithm. Adaptive partial matching crossover and inversus mutation method is adopted in the optimal...
Piezoelectric lead zirconate titanate (PZT) transducer in the electromechanical impedance (EMI) technique has emerged as a potential sensing tool for structural health monitoring. In the EMI technique, PZT acts as both sensor and actuator simultaneously due to its direct and inverse piezoelectric effects. The EMI method using PZT transducers provide a new way for in-situ nondestructive testing of...
Structural Health Monitoring (SHM) is a good approach to collecting data about critical structural elements and providing diagnosis of the structural condition. Among considerable solutions to perform SHM, Wireless Sensor Networks (WSNs) present a novel method with compelling advantages. However, in order to satisfy stringent requirements in SHM, WSN solution must handle numerous challenges before...
In the field of structural health monitoring of concrete bridges, one of the most important problems is the crack identification. In previous studies, sensitive skin for bionic crack monitoring of concrete bridges had been used to monitor the crack initiation and development in a concrete structure, and it was visualized by computer. But there are several problems that prevented this method from being...
Wireless Sensor Network is an emerging technology which can significantly reduce the cost and the time needed to monitor the conditions of civil structures. This work presents W-TREMORS, a new wireless sensing system for high-frequency distributed data acquisition. Our sensor network is based on the low-power and low-data rate standard IEEE 802.15.4, and we used inexpensive hardware. Nevertheless,...
Wireless sensor network (WSN)becomes a research hotspot of structural health monitoring(SHM) with the characteristics such as convenience for remote monitoring, good fault-tolerant ability, easiness of system maintenance ,etc. In this paper, a WSN for bridge SHM is designed and deployment on the ZhengDian viaduct in Wuhan. In this deployment, 20 wireless nodes are distributed over the main span, collecting...
Most methods of structural states assessment focused on statistical analysis considering only random uncertainties, or on fuzzy recognition considering only fuzzy uncertainties. The cloud model considers both of the two, implementing the transform between qualitative evaluation and quantitative numerical value. In this paper, healthy observations are used to determine the expectation function and...
Health diagnosis of bridge by traditional model-based method would face strong difficulty in constructing an accurately finite element model (FEM) due to the document lack of old bridge and the change of the structural parameters of bridge in the service. The further challenge still lies in the uncertainty of the ambient excitation in structural health monitoring of bridge. In this paper, an improved...
Buried pipe lines are an efficient way of transporting of water, sewage, oil, and gas resources in all over the world. Since the buried pipe lines are exposed to many unexpected conditions, such as landslides, corrosion, fatigue, earthquakes, material flaws or even intentional damaging, so the inspection requirements lead to adoption of new method of maintenance, protection and conserving. This report...
Structural Health Monitoring (SHM) systems have been used with many important structures to enhance the public safety and to reduce the economical losses. Wireless Sensor Networks (WSN) is an emerging technology which can be deployed with SHM applications. However, some system requirements have been overlooked in the current WSN designs for SHM applications. Therefore a complete analysis in system...
There are heavy studies recently on applying wireless sensor networks for structural health monitoring. These works usually focus on the computer science aspect, and the considerations include energy consumption, network connectivity, etc. It is commonly believed that for the current resource limited wireless sensors, system design could be more efficient if the application requirements are incorporated...
Recently, structural health monitoring technologies draw keen attention for sustaining large structures. In this paper, a smart sensor network consisting of intelligent sensor nodes with an accurate time synchronization mechanism for structural health monitoring is proposed. Using a prototype system, extensive tests have been conducted to ensure its performance. The proposed sensor network could achieve...
The main fiber optic and other non contact Photonic technologies used in Structural Health Monitoring (PSHM) will be reviewed, several case study and sector applications examples will also be addressed and, finally, the conclusions summarized.
Using the measured frequency response function (FRF) data, a novel algorithm for structural health monitoring is proposed based on the principal component analysis (PCA) in this paper. First, the measured FRF data for a structure in both the healthy and the damaged states are used as the initial data. A PCA transformation is performed to obtain the features of an intact structure, in which an orthogonal...
The task scheduler of an energy harvesting wireless sensor node (WSN) must adapt the task complexity and maximize the accuracy of the tasks within the constraint of limited energy reserves. Structural Health Monitoring (SHM) represents a great example of such an application comprising of both steady state operations and sporadic externally triggered events. To this end, we propose a task scheduler...
Wireless sensor network (WSN) has been considered to be the next generation paradigm of structural health monitoring (SHM) systems due to its low cost, high scalability and flexibility. However, some inherent limitations of WSN such as low-bandwidth wireless communication, limited resources on wireless sensor nodes, must be addressed to meet the generally high requirements of SHM. Distributed in-network...
In order to monitor the structural health condition in the case of damage samples shortage, a new approach is proposed by only using the healthy samples of vibration signals. By taking root mean square (RMS), variance, kurtosis and crest factor as characteristic parameters, an identification model for structural health condition monitoring is built by using Mahalanobis-Taguchi System (MTS). It is...
Structural Health Monitoring and Structural Identification are concepts that are more frequently being applied to improve the reliability and effectiveness of operational and maintenance management for constructed systems. This paper describes why the need for such paradigms continues to grow, and discusses many of the limitations associated with current approaches for assessing and evaluating the...
Mechanoluminescence (ML) is light emission induced by mechanical deformation. Strain/stress monitoring using ML materials has been developed as a non-destructive method for diagnosis of deterioration in structures; this method is promising and is expected to find broad application in the field of structural health monitoring (SHM). This paper proposes a light measurement system for the weak and diffusive...
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