1,720,954 research outputs found
Modellierung eines aktiven Luftfederdämpfers für den Einsatz in einer Gesamtfahrzeugsimulation
No full textLuft-Feder-Dämpfer (nachfolgend als LFD bezeichnet) bieten aufgrund ihrer physikalischen Eigenschaften gegenüber der konventionellen Kombination aus Stahlfeder und hydraulischem Dämpfer funktionale Vorteile für den Einsatz im Fahrwerk eines Fahrzeuges. Die Funktionalität eines LFD lässt sich noch erweitern, indem die Feder- und Dämpfungscharakteristika dynamisch verstellbar gestaltet werden. Abhängig von Aktorgestaltung und -dynamik inkl. der Regelung spricht man dann von adaptiven bis hin zu aktiven Fahrwerken bzw. Komponenten.
In den meisten bisherigen Publikationen wurden verstellbare LFD nur in Hinblick auf Teilaspekte der möglichen Vorteile untersucht, wobei einfache Fahrzeugmodelle wie der Zweimassenschwinger als Abbildung des Viertelfahrzeugs verwendet wurden. Dynamische Anpassungen der Feder- und Dämpfungseigenschaften an einem Rad beeinflussen jedoch in hohem Maße das Verhalten des Gesamtfahrzeuges. Um das Verhalten im Spannungsfeld aus Komfort, Sicherheit und Agilität optimal einzustellen, müssen entsprechende Regelsysteme eine Vielzahl von Ein- und Ausgangsgrößen berücksichtigen. Kernthema des Vortrages ist die Erstellung eines physikalischen LFD-Modells mithilfe von Matlab/Simulink und die anschließende Verwendung dieses Teilmodells in einem Gesamtfahrzeugmodell in der Simulationsumgebung der MKS-basierten Anwendung IPG Carmaker. Die Potenziale eines aktiven LFD werden dabei im Rahmen dieser Co-Simulation in Hinblick auf Fahrkomfort, -stabilität und Agilität mithilfe ausgewählter Fahrmanöver unter realitätsnahen Bedingungen untersucht. Dazu wird ein Regelkonzept zur dynamischen Anpassung des LFD vorgestellt und die erzielten Ergebnisse mithilfe der Visualisierungs- und Auswertungswerkzeuge von IPG Carmaker präsentiert.Air Spring Dampers (from now referred as LFD) offer functional advantages for vehicle chassis applications compared to the conventional combination of steel springs and hydraulic dampers due to their physical properties. The functionality of an LFD can be further enhanced by making the spring and damping characteristics dynamically adjustable. Depending on the actuator design and dynamics, including the control system, this is referred to as adaptive up to active chassis systems and components.
In most previous publications, adjustable LFDs have only been analyzed with regard to specific aspects of their potential benefits, often using simplified vehicle models such as the two-mass oscillator as a representation of a quarter-vehicle model. However, dynamic adjustments of the spring and damping properties at a single wheel significantly influence the behavior of the entire vehicle. To optimally balance the trade-off between comfort, safety, and agility, corresponding control systems must take a variety of input and output variables into account. The main topic of this presentation is the development of a physical LFD model using Matlab/Simulink and its subsequent integration into a full-vehicle model within the simulation environment of the MBS-based application IPG CarMaker. The potential of an active LFD is analyzed within this co-simulation framework concerning driving comfort, stability, and agility, using selected driving maneuvers under realistic conditions. For this purpose, a control concept for the dynamic adjustment of the LFD is introduced, and the obtained results are presented using the visualization and analysis tools of IPG CarMaker
Modellierung eines aktiven Luftfederdämpfers für den Einsatz in einer Gesamtfahrzeugsimulation
No full textLuft-Feder-Dämpfer (nachfolgend als LFD bezeichnet) bieten aufgrund ihrer physikalischen Eigenschaften gegenüber der konventionellen Kombination aus Stahlfeder und hydraulischem Dämpfer funktionale Vorteile für den Einsatz im Fahrwerk eines Fahrzeuges. Die Funktionalität eines LFD lässt sich noch erweitern, indem die Feder- und Dämpfungscharakteristika dynamisch verstellbar gestaltet werden. Abhängig von Aktorgestaltung und -dynamik inkl. der Regelung spricht man dann von adaptiven bis hin zu aktiven Fahrwerken bzw. Komponenten.
In den meisten bisherigen Publikationen wurden verstellbare LFD nur in Hinblick auf Teilaspekte der möglichen Vorteile untersucht, wobei einfache Fahrzeugmodelle wie der Zweimassenschwinger als Abbildung des Viertelfahrzeugs verwendet wurden. Dynamische Anpassungen der Feder- und Dämpfungseigenschaften an einem Rad beeinflussen jedoch in hohem Maße das Verhalten des Gesamtfahrzeuges. Um das Verhalten im Spannungsfeld aus Komfort, Sicherheit und Agilität optimal einzustellen, müssen entsprechende Regelsysteme eine Vielzahl von Ein- und Ausgangsgrößen berücksichtigen. Kernthema des Vortrages ist die Erstellung eines physikalischen LFD-Modells mithilfe von Matlab/Simulink und die anschließende Verwendung dieses Teilmodells in einem Gesamtfahrzeugmodell in der Simulationsumgebung der MKS-basierten Anwendung IPG Carmaker. Die Potenziale eines aktiven LFD werden dabei im Rahmen dieser Co-Simulation in Hinblick auf Fahrkomfort, -stabilität und Agilität mithilfe ausgewählter Fahrmanöver unter realitätsnahen Bedingungen untersucht. Dazu wird ein Regelkonzept zur dynamischen Anpassung des LFD vorgestellt und die erzielten Ergebnisse mithilfe der Visualisierungs- und Auswertungswerkzeuge von IPG Carmaker präsentiert.Air Spring Dampers (from now referred as LFD) offer functional advantages for vehicle chassis applications compared to the conventional combination of steel springs and hydraulic dampers due to their physical properties. The functionality of an LFD can be further enhanced by making the spring and damping characteristics dynamically adjustable. Depending on the actuator design and dynamics, including the control system, this is referred to as adaptive up to active chassis systems and components.
In most previous publications, adjustable LFDs have only been analyzed with regard to specific aspects of their potential benefits, often using simplified vehicle models such as the two-mass oscillator as a representation of a quarter-vehicle model. However, dynamic adjustments of the spring and damping properties at a single wheel significantly influence the behavior of the entire vehicle. To optimally balance the trade-off between comfort, safety, and agility, corresponding control systems must take a variety of input and output variables into account. The main topic of this presentation is the development of a physical LFD model using Matlab/Simulink and its subsequent integration into a full-vehicle model within the simulation environment of the MBS-based application IPG CarMaker. The potential of an active LFD is analyzed within this co-simulation framework concerning driving comfort, stability, and agility, using selected driving maneuvers under realistic conditions. For this purpose, a control concept for the dynamic adjustment of the LFD is introduced, and the obtained results are presented using the visualization and analysis tools of IPG CarMaker
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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