The flight control characteristics and certification compliance of a Distributed Electric Propulsion (DEP) aircraft using differential thrust is studied through exploration of flight envelops. Identification of critical flight phases specific to the use of propulsion systems as actuators for flight control is performed. In particular the influence ...
To analyze a non-linear, uncertain and time-varying closed loop representing a fighter aircraft model interconnected with a control law, an Integral Quadratic Constraint (IQC) approach has been used. This approach is particularly interesting for two reasons. The first one is that it is possible with the same stability criterion to analyze a large c...
The behaviour of a space-modulated, so-called 'argumental' oscillator, is studied. The oscillator is submitted to an external harmonic force, which is amplitude-modulated by the oscillator's position in space. An analytic expression of a stability criterion is given. Using the averaging method, an integrating factor and a Van der Pol representation...
Accidents involving Heavy Vehicles (HV) have serious consequences for road users,and incidents induce major congestion or damage to the environment or the infrastructure. Statistics show that accidents involving such vehicles are more serious than light vehicles (LV). The mortality rate is twice in an accident involving a heavy vehicle (see table 1...
Ce document a pour objectif de faire des recommandations pour la réalisation d'études de stabilité de paramètres au cours de la chaîne de mesure de paramètres physico-chimiques : micropolluants organiques, micropolluants inorganiques et organométalliques, nutriments et macropolluants dans les matrices aqueuses : eaux de surface (ESU), eaux souterra...
La justification de la stabilité d'un barrage-poids existant sur une fondation rocheuse nécessite une justification de la stabilité vis-à-vis du glissement à l'interface entre béton et roche. Le comportement au cisaillement de cette interface dépend de l'effort normal appliqué, des déformabilités de la roche et du béton, de la morphologie de la sur...
This article provides theoretical conditions for the use and meaning of a stability analysis around a mean flow. As such, it may be considered as an extension of the works by McKeon & Sharma (J. Fluid Mech., vol. 658, 2010, pp. 336–382) to non-parallel flows and by Turton et al. (Phys. Rev. E, vol. 91 (4), 2015, 043009) to broadband flows. Consider...
Published in Gait & posture
The extrapolated center of mass (XCoM), a valuable tool to assess balance stability, involves defining the whole body center of mass (CoMWB). However, accurate three-dimensional estimation of the CoMWB is time consuming, a severe limitation in certain applications. In this study, twenty-four subjects (young and elderly, male and female) performed t...
This paper presents two transmission interface treatments, Dirichlet-Robin and Neumann-Robin procedures, that may be employed for conjugate heat transfer problems. These conditions are analyzed on the basis of a 1D simplified model problem. In the first part of the paper, the Dirichlet-Robin procedure is presented. This interface treatment is the m...
Le renforcement du front de taille des tunnels par boulonnage est une technique très courante. Elle permet d'améliorer la stabilité du front de taille et de réduire les tassements de surface. Bien que cette technique soit très répandue, il n'existe pas encore d'outil ou de méthode simple de dimensionnement du dispositif de renforcement. De plus, le...
