1,720,965 research outputs found
Dataset for 'Modelling train-induced vibration of structures using a mixed-frame-of-reference approach'.
No full textDataset for paper: Bucinskas P., Ntotsios E., Thompson D.J. and Andersen L.V. (2020). Modelling train-induced vibration of structures using a mixed-frame-of-reference approach. Journal of Sound and Vibration. DOI:https://doi.org/10.1016/j.jsv.2020.115575</span
A mixed-frame-of-reference model for railway induced soil-structure vibration interaction
No full textWhen modelling the railway induced vibration in a building, three main aspects of the problem have to be considered: the vibration generation at the moving vehicle-track interaction points, the vibration propagation in the underlying infinite soil, and the vibration reception inside the building. This study proposes a computational modelling approach for predicting the full vibration propagation path from the train vehicles up to the building structure. The method includes a moving train model that is directly coupled to a stationary building structure, with interaction between them through the underlying soil using a single step solution procedure. A semi-analytical model is utilized to model the soil to which rigid objects and structures modelled by finite elements (FE) are coupled. The system is excited by a multi-body vehicle model passing over an irregular track. The proposed modelling approach uses the frequency-domain solution with some parts, such as the railway track, formulated in the moving frame of reference (FOR) and other parts, such as building structures, formulated in a fixed FOR. The coupling terms between the two FORs are found by utilizing an analytical formulation of receptance between the two FORs. It is shown that due to the coupling between the fixed and moving FORs, the previously uncoupled discrete frequencies become coupled through the other FOR as a result of the Doppler effect and wave scattering. Two solution procedures of the full system are pro-posed: partial coupling, where some secondary effects from reflected waves propagating through soil are disregarded, and full coupling, where the vehicle, track, soil and structure are modelled as a fully coupled system. Both proposed solution procedures offer a single-step approach for solving the whole system in the frequency-spatial domain. The application of the model is demonstrated and validated in two example cases: one analyzing a simple building structure near a railway track, using the partial coupling solution procedure, and another analyzing the behaviour of a vehicle model passing over a rigid block embedded inside the soil, using the full coupling solution procedure
Numerical and Experimental Investigation of Stop-Bands in Finite and Infinite Periodic One-Dimensional Structures
No full textAdding periodicity to structures leads to wavemode interaction, which generates pass- and stop-bands. The frequencies at which stop-bands occur are related to the periodic nature of the structure. Thus structural periodicity can be shaped in order to design vibro-acoustic filters for reducing vibration and noise transmission. The aim of this paper is to investigate, numerically and experimentally, stop-bands in periodic one-dimensional structures. Two methods for pre-dicting stop-bands are described: the first method applies to infinite periodic structures using a wave approach; the second method deals with the evaluation of a vibration level difference (VLD) in a finite periodic structure embedded within an infinite one-dimensional waveguide. This VLD is defined to predict the performance in terms of noise and vibration insulation of periodic cells embedded in an otherwise uniform structure. Numerical examples are presented, and results are discussed and validated experimentally. Very good agreement between the numerical and experimental models in terms of stop-bands is shown. In particular, the results show that the stop-bands obtained using a wave approach (applied to a single cell of the structure) predict those obtained from the VLD of the corresponding finite periodic structure
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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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