The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Older drivers face decline in perceptual, cognitive, and motor abilities, and yet, increased fragility largely explains their increased risk of fatal crashes. Adaptation and self-regulation explain why older drivers can be safe drivers in the face of declining ability. Left turns and U-turns are particularly challenging, accounting for 10% of crashes for drivers aged 60–69 and increasing to 32% for...
This paper focuses on a convertible unmanned aerial vehicle (CUAV) whose main characteristics is to perform hover flight for launch or recovery, and horizontal mode during cruise. The dynamic model is obtained using the Newton-Euler approach and it considers the aerodynamic effects. An adaptive backstepping control, based on quaternions, is proposed for the complete operation of the CUAV. The closed-loop...
This paper focuses on the aerodynamic design and performance of a mini airplane UAV. The mini aerial vehicle is based on a conceptual design considering a high aerodynamic finesse (a high ratio between lift and drag), flying and handling qualities in order to perform a reliable and stable flight. The equations of motion are described using the Newton-Euler formulation and the stability derivatives...
The purpose of this paper is to present a new configuration of a vectored-thrust coaxial UAV(V-co-aX). The main characteristic of this vehicle is that it uses thrust vectoring for control in hover mode. A functional description of this mechanism is given and the Newton-Euler approach is applied to obtain the dynamic model of the flight platform. A non-linear controller based on saturation functions...
In this contribution nonlinear stabilizing and optimal nonlinear control strategies for a quadrotor mini helicopter are addressed. These control strategies are an alternative for the control of flying machines not much explored yet. Simulation and real-time experiences are presented in this contribution. Nonlinear stabilizing control algorithm has been successfully implemented on an autonomous aerial...
Background subtraction involves processing of a video sequence from a static camera to detect the foreground objects in all frames. This paper introduces a robust background subtraction technique, the Adaptive Local Threshold (ALT) algorithm, which it is based on the Approximate Median Filter (AMF). It has been applied to accurately extract the moving vehicles on complex weather traffic videos (i...
Autonomous navigation of an unmanned aerial vehicle (UAV) can be achieved with a reactive system which allows the robot to overcome all the unexpected changes in its environment. In this article, we propose a new approach to avoid frontal obstacles using known properties of the optical flow and by taking advantage of the capability of stationary flight of the rotorcraft. A state machine is proposed...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.