Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 14 of 14 for “"damage location"”.
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Damage location and estimation in large space structures
This thesis presents a unique method of damage detection in large space structures. The goal is to develop an efficient algorithm which can be automated in an on-line format, and can asses damage in many elements. Theses are goals not realized by current methods. Damage incurred in a structural …
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Evaluation of ceramic candle filters degradation and damage location using four-point bending tests
… of these ceramic filters indicated that damage of the filters may have resulted from strength degradation due to persistent high temperature operation, thermal transient events, excessive ash accumulation and bridging, and pulse cleaning. This study proposes a nondestructive evaluation of …
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Structural Health Monitoring Using Multiple Piezoelectric Sensors and Actuators
… complex structures to detect incipient-type damage such as small cracks or loose connections. However, there are still some problems to be solved before full scale development and commercialization can take place. These include: i) the damage assessment is influenced by ambient temperature …
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Damage Detection Using Destructive Testing of a Reinforced Concrete Slab
… SHE^tm program, which quantitatively measures damage location and severity for any set of time data.
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Harvested log damage and value loss associated with two ground-based harvesting systems in central Appalachia
Damage is often seen as an important consideration when conducting partial harvests in hardwood stands, as excessive damage to residual trees will significantly reduce the potential value of the residual stand. Damage to harvested logs, especially hardwood saw and veneer logs can be an even more …
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Damage detection in structures using frequency response function (FRF) data and finite element modelling
… thesis presents a method to detect structural damage using frequency response function (FRF) data obtained from non-destructive vibration tests. The method is used to study cases of early structural damage in which there is no appreciable change in mass and damping. The resulting change in …
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On Model- and Data-based Approaches to Structural Health Monitoring
… a structural system with the aim of diagnosing damage in the structure. Over the course of the past several decades there has been ongoing interest in approaches to the problem of SHM. This attention has been sustained by the belief that SHM will allow substantial economic and life-safety …
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Advanced functional and sequential statistical time series methods for damage diagnosis in mechanical structures
… witnessed major developments in vibration based damage detection and identification, also collectively referred to as damage diagnosis. Moreover, the past 10 years have seen a rapid increase in the amount of research related to Structural Health Monitoring (SHM) as quantified by the significant …
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Acoustic emission source location in composite aircraft structures using modal analysis
… was to develop an Acoustic Emission (AE) source location method suitable for Structural Health Monitoring (SHM) of composite aircraft structures. Therefore useful key signal features and sensor configurations were identified and the proposed method was validated using both artificially generated …
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Towards a Self-Powered Structural Health Monitoring Smart Tire
… addition of electrical circuit to enhance the damage detection process. Experimental work was conducted on an aluminum beam and on a tire section with commercially available piezoelectric sensors. The use of a high voltage impedance analyzer was demonstrated to provide insight on damage type …
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Defect characterization in concrete elements using vibration analysis and imaging
… testing method has the advantage that internal damage location, size and shape need not be known in advance. Fourth, an effective data imaging technique is proposed for comprehensive interpretation of air-coupled IE data, specifically for detection of near-surface delamination defects. The …
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Structural Health Monitoring for Bridge Structures Using Wireless Smart Sensors
… due to sudden collapse. To date, numerous damage detection algorithms have been proposed. Still, challenges remain in applying such algorithms to monitor bridges in the field. In reality, the extent of an SHM system is limited by available budgets, which define the number of sensors that …
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Modeling and Experimental Analysis of Piezoelectric Augmented Systems for Structural Health and Stress Monitoring Applications
Detection, characterization and prognosis of damage in civil, aerospace and mechanical structures, known as structural health monitoring (SHM), have been a growing area of research over the last few decades. As several in-service civil, mechanical and aerospace structures are approaching or even …
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Model updating of modal parameters from experimental data and applications in aerospace
… experimental data, allows to determine both the locations and force components resulting in the highest phase purity, and enable to predict the corresponding mode indicator. A minimisation criterion for the real-part response of the test structure with respect to the total response is utilised …