13,160 research outputs found
Réponse à Giuseppe Longo
No full textDoridot Fernand, Panza Marco. Réponse à Giuseppe Longo. In: Intellectica. Revue de l'Association pour la Recherche Cognitive, n°39, 2004/2. Des lois de la pensée aux constructivismes. pp. 299-301
Rotor state feedback in helicopter flight control: Robustness and fault tolerance
No full textHelicopter flight control law design including rotor state feedback is considered and an approach based on structured H∞ control, capable of guaranteeing stability and performance robustness, is proposed. The framework also encompasses fault tolerance with respect to failures of the rotor state sensors. Simulation results comparing the proposed approach to results from the literature are presented and discussed
Compte-rendu de : Marco Panza, Nombres : éléments de mathématiques pour philosophes
No full textLe titre de l’ouvrage présenté par Marco Panza, historien et philosophe des mathématiques très connu, est modeste. Il peut laisser croire qu’on a affaire à un des nombreux manuels présentant élémentairement les constructions successives des entiers naturels, des entiers relatifs, des rationnels et des réels telles qu’elles sont exposées en terminale scientifique. Mais cette modestie n’est que dans le titre, car dès la lecture de la préface on voit que l’ambition de l’auteur est toute autre. ..
Robust filtering for very high accuracy attitude determination
No full textIn this paper the problem of line-of-sight sensing using a highbandwidth Angular Rate Sensor (ARS), together with attitude sensors like a star tracker and a gyroscope is considered. Based on a parametric identified model for the dynamics of the ARS, a fully integrated solution to the three-Axis attitude and rate determination problem has been developed, both for on-line and off-line robust filtering. The performance of the developed algorithms has been assessed in a simulation study, based on test cases representative of a desired filter bandwidth up to 1 kHz
Rotor state feedback in the design of rotorcraft attitude control laws
No full textHelicopter flight control law design including rotor state feedback (RSF) is considered. A mathematical model suitable for analysis and design of RSF control systems is obtained and a structured Hinfinity approach to the problem is proposed, capable of guaranteeing stability and performance robustness. The framework also encompasses fault tolerance with respect to failures of the rotor state sensors. Simulation results comparing the proposed approach to results obtained using conventional attitude control laws are presented and discussed
Marco Panza et Jean-Claude Pont (dir.), Les Savants et l'épistémologie vers la fin du XIXe siècle (Paris : Libr. scientif. et techn. A. Blanchard, 1995)
No full textMarco Panza et Jean-Claude Pont (dir.), Les Savants et l'épistémologie vers la fin du XIXe siècle (Paris : Libr. scientif. et techn. A. Blanchard, 1995). In: Revue d'histoire des sciences, tome 51, n°1, 1998. pp. 157-158
Robust Tuning of Geometric Attitude Controllers for Multirotor Unmanned Aerial Vehicles
Get PDFIn recent years there has been a significant body of literature proposing nonlinear attitude control laws for small-scale multirotor unmanned aerial vehicles (UAVs), motivated by the high maneuverability of these platforms. While tracking trajectories characterized by fast and large attitude changes makes the control problem intrinsically nonlinear, most of the works proposing nonlinear designs is concerned with establishing their stabilizing properties, often deduced by referring to simplified dynamic models, but limited attention has been devoted to performance. As a consequence, less satisfactory results than expected are typically achieved in experiments and the controller gains must be adjusted with trial-and-error procedures to obtain good performance. This paper proposes a model-based tuning method that exploits the cascade structure of the attitude dynamics and that needs only single-axis identified linear models of the angular velocity dynamics to be applied. The tuning of the controller gains is carried out on the linearized closed-loop system with structured H∞ synthesis that allows one to enforce robustness against model uncertainty in a systematic way and to achieve a desired level of performance in nominal conditions. The approach is validated by tuning the gains of a novel Proportional/Proportional Integral Derivative (P/PID)-like cascade, which has been developed in the framework of geometric control theory. A thorough analytical comparison of the proposed design with a geometric Proportional Integral (PI)-like controller borrowed from the literature is complemented with experiments conducted on a small quadrotor UAV
Marco Panza et Jean-Claude Pont (dir.), Les Savants et l'épistémologie vers la fin du XIXe siècle (Paris : Libr. scientif. et techn. A. Blanchard, 1995)
No full textMarco Panza et Jean-Claude Pont (dir.), Les Savants et l'épistémologie vers la fin du XIXe siècle (Paris : Libr. scientif. et techn. A. Blanchard, 1995). In: Revue d'histoire des sciences, tome 51, n°1, 1998. pp. 157-158
“Un Piranesi “trevigiano”
No full textSulla base delle “Condizioni di Decima del Sestiere di S. Marco”, 13 maggio 1739 all’Archivio di Stato di Venezia si certificano, per la prima volte, le proprietà presso Mogliano veneto della famiglia Piranesi, riaccreditando la tesi del concepimento o nascita di Giovan Battista in territorio trevisano e successivo battesimo l’8 novembre 1720 a Venezia. Studio sulla genealogia dell’artista
- …
