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.
Results
Showing 1 to 6 of 6 for “"Far-field measurements"”.
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Using far-field measurements for determining mixed-mode interactions at interfaces
… method to extract mixed-mode TSRs using only the far-field measurements. The first topic of the dissertation deals with extracting mixed-mode TSRs based on a combination of global and local measurements including load-displacement, crack extension, crack tip opening displacement, and fracture …
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Investigation of a compact acoustic source array for the active control of aircraft engine fan noise
… sources arranged circumferentially in a duct. Measurements of the performance of each source revealed that the performance of the acoustic sources varied from source to source. This variation was assumed to have been caused by differences in the quality of the bond of each of the piezoceramic …
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Experimental and modeling analysis of near-field scattering from complex targets
… controlled monostatic and bistatic, near field and far field measurements of scattering from proud and half buried targets, which are representative of real world mines. This thesis focuses on the analysis of near-field bistatic data set obtained by supercritically insonifying proud …
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Thermo-mechanical response and plastic deformation behavior of Hastelloy X at elevated temperatures — role of dynamic strain aging
… temperatures is studied locally, through the DIC measurements, and globally through far field measurements, with a relation between the two measurement scales being established. The DIC results, when correlated with the global load-displacement measurements, illustrate the contribution of the PLC …
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Prediction and interpretation of ground movements due to tunneling in stiff clay and impacts on adjacent structures
… London Clay. The research focuses on the 'greenfield' response during tunnel excavation beneath Hyde Park. Far-field measurements of surface and subsurface ground movements were interpreted using 2D finite element analyses using a range of constitutive models with parameters calibrated to …
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Application of radio-frequency identification (RFID) sensors for smart- monitoring applications in sewer systems
… in terms of accuracy and stability in the near-field and far-field measurements compared to the 8 dBiC and the 12.5 dBi antennae. The high humidity and water environments like the sewer pipes are detrimental to the performance of UHF-RFID sensors. Therefore, 3D-printed polylactic acid (PLA) and …