1,721,120 research outputs found
Identification of linear parameter-varying state space models with application to helicopter rotor dynamics
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An Efficient Control Oriented Modeling Approach for Lithium Ion Cells
No full textLithium ion (Li-ion) batteries are the current
preferred choice for electric vehicles. However the behavior
of Li-ion batteries is complex. In order to safely exploit
their advantages, advanced model-based Battery Management
systems are required. This paper introduces a computationally
efficient, control oriented modeling approach of a Li-ion cell.
The model captures the spatial nature of the dynamics of the
cell in a computationally efficient way. The enabling factor is to
explicitly take advantage of the algebraic structure that arises
from the distributed nature of the model. This yields an efficient
simulation tool and a closed-form state space model that can
be employed for control system design purposes. The proposed
model is validated against a complete CFD model
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
Force-Based ABS Control Using Lateral Force Measurement
No full textIn this paper a hybrid force-based Anti Locking Braking System (ABS) is presented. The proposed control system directly considers the lateral tyre behaviour during heavy braking. In this way it is possible to guarantee drivability and stability also when braking on surfaces without a clear tyre characteristic peak. The goal of the paper is to show the potentialities of load-based vehicle dynamics control. It is shown that, thanks to the availability of the lateral and longitudinal tyre force measurements, a stable braking can be achieved with a minimal increase of complexity of the algorithm in conditions that are critical for traditional ABS. The general control concept is that of reducing the longitudinal slip if the measured lateral force is smaller than a desired minimum. Two different ways of computing the minimum lateral forces are presented: one for the front axle with the objective of guaranteeing steerability and one for the rear axle to guarantee stability. Simulations on a nonlinear vehicle simulator confirm that the controller can maintain the desired steering behaviour and vehicle yaw stability in case of heavy braking
Two-phase Anti-lock Braking System using Force Measurement
No full textThe Anti-lock Braking System (ABS) is the most important active safety system for passenger cars. Thanks to force measurement, provided for example by the new SKF Load Sensing Hub Bearing Units, hybrid ABS algorithms can be made simpler and more robust than when only using wheel acceleration measurement. A two-phase algorithm is presented, where the wheel acceleration is controlled in closed-loop and the longitudinal force measurement is used to fire phase switching. Realistic simulations shows that this simple algorithm can handle changes in vehicle velocity and tire-road friction without extra logic or adaptation of the controller parameters. Finally the algorithm is validated on a tyre-in-the-loop experimental facility
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
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