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 20 of 38 for “"ambient vibration"”.
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Ambient vibration testing of concrete dams
… analysis (CVA)) have been applied to data from ambient vibration testing of two concrete dams namely; Roode Elsberg and Kouga dams.
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Ambient vibration analysis of a full-scale hyperbolic cooling tower
Call number: LD2668 .T4 CE 1987 H44
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Ambient vibration analysis of a full-scale hyperbolic cooling tower
Call number: LD2668 .T4 CE 1987 H44
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Integrated protocol for ground and structures condition assessments using ambient vibration
… carry out the re-evaluation work. Application of ambient vibration (AV) technique is widely used on ground and structures diagnosis works, but none of an effort to integrate them into a specific protocol. The main goal of this thesis is to develop a robust integrated condition assessment protocol …
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Estimation of Cable Forces at the Ashton Bridge through Ambient Vibration Testing
… of the structure. Superstructure and cable vibration data was collected on site after the final stage of cable tensioning. Finite element models of each cable were created using the software, Sofistik. Thereafter, the force in the cable models was iterated until the theoretical natural …
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Effect of potential shape and excitation spectrum on power harvested from ambient vibration
… developments in energy harvesting from ambient vibrations in small-scale sensing. The ultimate goal is to replace batteries in these sensors. Linear systems have a narrow bandwidth, but ambient vibrations occur over a potentially broad range of frequencies. Nonlinear systems-in …
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Seismic site characterization using broadband and DAS ambient vibration measurements on Mt Etna, Italy
… tools to gain insight into local site effects by ambient noise measurements. Here, the two methods are employed to assess the subsurface velocity structure at the Piano delle Concazze area on Mt Etna. Volcanic tremor records from an array of 26 broadband seismometers is processed and a strong …
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Structural performance evaluation of concrete arch dams using ambient vibration monitoring and GNNS systems
Societies around the world are heavily dependent on civil engineering infrastructures such as concrete dams that provide necessities such as water supply for irrigation, hydroelectric power generation and prevention of floods. As a result, it is important to ensure that concrete dams are protected …
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Calibration of an arch dam model by the finite element method using ambient vibration testing
… were extracted from the structure using ambient vibration testing techniques. Besides the geometry and general material properties of the dam wall concrete and foundation rock, the measured frequencies and mode shapes depend on the conditions at the dam site namely water level, …
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Finite element model updating of concrete arch dams affected by alkali-silica reaction using ambient vibration monitoring and dam surveillance data
… dam surveillance program that includes ambient vibration monitoring is essential as it enables an in-depth understanding of the behaviour of a dam in operation. Additionally, structural behaviour analysis through numerical models such as finite element (FE) models, is a crucial aspect of …
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Methods of frequency tuning vibration based micro-generator
A vibration based micro-generator is an energy harvesting device that couples a certain transduction mechanism to the ambient vibration and converts mechanical energy to electrical energy. In order to maximize available power, micro-generators are typically inertial devices that operate at a single …
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Improving piezoelectric energy harvesting power bandwidth with the bias-flip method
Vibration energy harvesters may be used as robust and reliable sources of energy for low-power devices such as wireless sensors. Of the many type of vibration energy harvesters, the piezoelectric energy harvesting device (PEHD) is favored for its high energy density and ability to self-start. As a …
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Modal Identification Using Smart Mobile Sensing Units
… was formulated for sinusoidal, impulse and ambient vibration. Emphasis was given on ambient vibration since this is the preferred approach for testing civil infrastructure. The results of this research conclude that MIMS has the potential to be used on modal identification.</p> <p>A Fast …
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Experimental and Analytical Characterization of a Transducer for Energy Harvesting Through Electromagnetic Induction
… interest in the harvesting and storage of ambient vibration energy. This work documents recent efforts to model a novel electromagnetic transducer design that is intended for use in energy harvesting. The thesis details methods of experimental characterization as well as model validation. …
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Dynamic Testing of an Elevated Water Tank
… components consisted of characterizing the vibration of the elevated water tank in its current environment through ambient vibration testing. </p>
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Natural frequencies evaluation on existing reinforced concrete bridges using microtremor testing
… of the bridges. Microtremor is also known as ambient vibration test. The test is a non-destructive test and easy to be conducted with less labor, time and cost. From the testing, „ambient‟ vibration excitation experienced by a structure under normal operating conditions can be determined. The …
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Micro-Scale and Nonlinear Vibrational Energy Harvesting
… to resonant at the dominant frequency of the ambient vibration. The fundamental natural frequency of a beam increases as its length decreases, so that at the MEMS scale the resonance condition occurs orders of magnitude higher than ambient vibration frequencies rendering the harvester …
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Ultra wide-bandwidth micro energy harvester
… and tested. It harvests energy from parasitic ambient vibration at a wide range of amplitude and frequency via piezoelectric effect. At the present time, the designs of most piezoelectric energy devices have been based on high-Q linear cantilever beams that use the bending strain to generate …
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Dynamic modelling of arch dams in the ambient state
… Roode Elsberg concrete-arch dam. Thereafter, ambient vibration tests were conducted on the Roode Elsberg dam to measure its dynamic properties and validate the finite element models. The excitation on the dam was provided by the wind and the reservoir flowing over the spillway. Vibrations of …
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