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As we know that energy is important part of our life. Energy available in different form like heat energy, solar energy, wind energy, etc. In our day to day life importance of alternative and renewable energy source increases year by year because of limited availability of non-renewable energy source. Hence it is necessary to take preventive action and increase the use of renewable energy source....
In order to monitor blade health and detect any damage efficiently, a new diagnosis method for wind turbine blades was proposed. In consideration of harsh environments of a wind turbine rotor, high-resolution real-time blade condition monitoring was realized with the use of optic sensors and a wireless network. A hybrid algorithm, which merges a statistical method with model information, was introduced...
Fiber Bragg grating (FBG) sensors used for detecting interface damage of steel-concrete composite bridge deck model was tested. The interface damage includes slippage and disengage. The tests cover three stages: dead load tests, fatigue tests(3 × 106 cycles) and destructive tests. In the fatigue test stage, dynamic loads with equal amplitude harmonic wave were added. During the destructive test stage,...
In this work a novel wavelet-fuzzy logic approach to structural health monitoring is proposed based on wavelet transform theory and fuzzy logic technology. The proposed method combines the effectiveness of the Wavelet Packet Transform (WPT) as a tool for feature extraction and the capabilities of fuzzy sets to model vagueness and uncertainty. Two stages of operation are considered: pattern training...
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...
The Cutty Sark is undergoing major conservation to slow down the deterioration of the original Victorian fabric of the ship. While the conservation work being carried out is “state of the art,” there is no evidence at present of the effectiveness of the conservation work over the next fifty years. A prognostics framework is being developed to monitor the “health”...
The processing of backscattered signals coming from RFID tags has been demonstrated to be potentially useful to detect the physical state of the target object. It is here shown how to design a completely passive UHF RFID sensor for strain monitoring starting from a meander-line dipole whose shape factor and feed section are engineered to achieve the desired sensing resolution and range. This class...
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 of buried pipelines is an important application for aging infrastructures. Ultrasonic guided wave inspection is an attractive tool, due to the long propagation of guided waves in the wall of a hollow cylinder. However, guided waves present a unique environment with heavily multi-modal signal propagation and complex dispersion (frequency-dependent propagation speeds). In...
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,...
With virtual instrumentation and graphical system design, the application requirements ultimately dictate the shape and form of the structural test and monitoring system. Virtual instrumentation offers more complete, more capable, and lower cost structural test and monitoring systems. This paper will provide an architectural view of modern structural test and monitoring systems, diving into both COTS...
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...
In a mobile agent-based monitoring network, mobile monitoring agents travel over the network to detect abnormal conditions in real-time. Each mobile monitoring agent is a damage diagnosis program which can recognize certain type of damage. To achieve effective damage detection and prolong the lifetime of a monitoring network, this paper studies energy-aware distribution of mobile monitoring agents...
The present paper proposes a wireless sensor network in order to verify the building structural health by monitoring the vibration levels transmitted. In particular the network allows to assess if the vibration levels may cause damage to the building or if it needs further study. The vibration levels are compared with fixed thresholds suggested by studies and regulations. The attention has been focused...
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