1,720,964 research outputs found
An original approach for the cylinder by cylinder A/F ratio control with a linear oxygen sensor
No full textLateral control of autonomous electric cars for relocation of public urban mobility fleet
No full textThis brief deals with lateral dynamic control of electric vehicles in an urban environment, motivated by individual public transportation issues, aimed to contribute to reduce metropolitan areas pollution. The framework in which the control strategy is developed is the so-called "look-down reference," in which the lateral displacement is obtained from a onboard sensor, interacting with a road infrastructure. In this framework, the designed control algorithm is made up of a combined feedback-feedforward structure. The feedback action is given by three nested closed loops with cascade compensators, where the outer one is nonlinear. The feedforward action is based on the knowledge of the road curvature, corrected by the measure of the car lateral displacement. Results from experimental tests performed on an actual circuit show the effectiveness of the considered control strategy
Robust vehicle yaw control using active differential and Internal Model Control techniques
No full textRobust vehicle yaw control using an active differential and IMC techniques
No full textA robust non-parametric approach to improve vehicle yaw rate dynamics by means of a rear active differential is introduced. An
additive model set is used to describe the uncertainty arising from the wide range of the vehicle operating situations. The design of the feedback controller is performed using an enhanced internal model control (IMC) technique, able to handle in an effective way both robustness and control variable saturation issues. In order to improve the transient behaviour a feedforward control contribution has been added giving rise to a two degree of freedom structure. Improvements on ndersteering characteristics, stability in demanding conditions such as m-split braking and damping properties in reversal steer and low friction step steer manoeuvres are shown through
simulation results performed on an accurate 14 degrees of freedom non-linear model of a segment D car
Lateral control of autonomous electric cars for relocation of public urban mobility fleet
No full text
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
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