1,720,965 research outputs found
Dataset for paper: Full-Field Surface Pressure Reconstruction Using the Virtual Fields Method
No full textRelevant data and code for paper 'Full-Field Surface Pressure Reconstruction Using the Virtual Fields Method' by R. Kaufmann, B. Ganapathisubramani, F. Pierron in Experimental Mechanics.
Deflectometry, LDV, pressure transducer data.
Data can be requested via http://library.soton.ac.uk/datarequest.</span
Dataset for paper: Surface Pressure Reconstruction from Phase Averaged Deflectometry Measurements Using the Virtual Fields Method
No full textThis dataset supports the publication: 'Surface Pressure Reconstruction from Phase Averaged Deflectometry Measurements Using the Virtual Fields Method' by R. Kaufmann, B. Ganapathisubramani, F. Pierron in Experimental Mechanics, 2019. Deflectometry, LDV data.
Data can be requested via http://library.soton.ac.uk/datarequest.</span
Dataset for paper: Reconstruction of surface pressure fluctuations using deflectometry and the Virtual Fields Method
No full textThis dataset supports the publication: 'Reconstruction of surface pressure fluctuations using deflectometry and the Virtual Fields Method' by R. Kaufmann, F. Pierron, B. Ganapathisubramani in Experiments in Fluids, 2019. Deflectometry, LDV, pressure transducer data.
Data can be requested via http://library.soton.ac.uk/datarequest.</span
Experimental data for 'Reconstruction of Surface Pressures on Flat Plates Impacted by Blast Waves Using the Virtual Fields Method'
No full textMeasurements on a flat steel plate were conducted in order to demonstrate a novel approach to reconstruct full-field pressure distributions on said plate using the virtual fields method (VFM).
Pressure was applied using SIMLab Shock Tube Facility at the Department of Structural Engineering, NTNU specialized on blast wave generation.
Deflectometry was used to measure time-resolved slope changes on the plate surface.
Background Oriented Schlieren was used to visualize the approaching blast wave.
The shock tube exit was modified with 3 different blockages to change the symmetry of the generated blast waves.
Pressure transducer measurements were conducted to compare the VM pressure reconstructions to an established technique.
This dataset contains the experimental data acquired during the blast tests on the steel plate.</p
Full-field surface pressure reconstruction using deflectometry and the virtual fields method
No full textThis thesis presents a technique for the reconstruction of full-field surface pressure distributions with low differential amplitudes. The method is demonstrated in two different setups with air jets impinging on flat plates. Surface deformations were obtained using deflectometry, a highly sensitive technique for slope measurement. The surface slopes in combination with the plate material constitutive mechanical parameters were used as input for pressure reconstructions with the Virtual Fields Method (VFM), which is an application of the principle of virtual work. Both static and dynamic pressure distributions were reconstructed in full-field with this technique. Results were compared with pressure transducer measurements at discrete points. The observed pressure amplitudes were between O(1) Pa – O(100) Pa. The spatial extent of the investigated flow structures was O(1) mm – O(10) mm. Dynamic pressure information was extracted from time-resolved deflectometry data using temporal band-pass filters or phaselocked measurements. Dynamic Mode Decomposition (DMD) was used on time-resolved data to identify relevant spatial information that correspond to specific frequencies. Despite the low differential amplitudes, dynamically important spatio-temporal events could be observed. Full-field measurements of such small-scale, low-amplitude pressure events are not possible with established pressure measurement techniques. A finite element model was employed in combination with artificial grid deformation to assess the uncertainty of the pressure reconstructions. Finally, challenges and limitations in achieving the metrological performance for resolving the observed surface slopes of O(0.1) mm km-1 – O(10) mm km-1 as well as in the pressure reconstruction approach are described and strategies for future applications are discussed
Volumetric flow characterisation of a rectangular orifice impinging synthetic jet with single-camera light-field PIV
No full textThe formation and evolution of volumetric flow structures from a rectangular orifice synthetic jet (퐴푅 = 10, 푅푒 = 550, 푆푟 = 0.0117, and 퐿표 = 0.0855푚) impinging on a flat plate is investigated using phase-locked single-camera light-field particle image velocimetry (LF-PIV). An impinging plate is located 24 orifice widths away from the rectangle orifice and this volumetric flow data is used to capture the mechanisms involved in the interaction. Flow statistics and structure information obtained by time-averaging and phase-averaging the volumetric data reveal the formation and evolution of three-dimensional vortical structures and sweeping vortex that characterise the flow-surface interaction. <br/
Full-field surface pressure reconstruction using the virtual fields method
No full textThis work presents a methodology for reconstructing full-field surface pressure information from deflectometry measurements on a thin plate using the Virtual Fields Method (VFM). Low-amplitude mean pressure distributions of the order of few O(100) Pa from an impinging air jet are investigated. These are commonly measured point-wise using arrays of pressure transducers, which require drilling holes into the specimen. In contrast,the approach presented here allows obtaining a large number of data points on the investigated specimen without impact on surface properties and flow. Deflectometry provides full-field deformation data on the specimen surface with remarkably high sensitivity. The VFM allows extracting information from the full-field data using the principle of virtual work. A finite element model is employed in combination with artificial grid deformation to assess the uncertainty of the pressure reconstructions. Both experimental and model data are presented and compared to show capabilities and restrictions of this method
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
- …
