Delay system identification applied to the longitudinal flight of an aircraft through a vertical gust

International audienceThis paper deals with modelling and identification of aircraft dynamic entering a vertical gust. The identification approach initiated in (Fliess 2003) falls under a prospect for identification from tests carried out in the Flight Analysis Laboratory of the DCSD of ONERA in Lille. The plane is considered into various elements which consist in the fuselage, the wing and the tail. The model incorporates delays linked to the aircraft passage through the atmospheric turbulence

Delay system identification applied to the longitudinal flight of an aircraft through a vertical gust

International audienceThis paper deals with modelling and identification of aircraft dynamic entering a vertical gust. The identification approach initiated in (Fliess 2003) falls under a prospect for identification from tests carried out in the Flight Analysis Laboratory of the DCSD of ONERA in Lille. The plane is considered into various elements which consist in the fuselage, the wing and the tail. The model incorporates delays linked to the aircraft passage through the atmospheric turbulence

Wind estimation algorithm for quadrotors using detailed aerodynamic coefficients

International audienceIn the context of safe control of quadrotors, wind velocity estimation and compensation have a key-role. For this reason, assuming the lack of airspeed sensors and considering sensors noise, in this paper three time-varying parameter estimation algorithms are introduced, studied and merged to estimate the varying wind velocity, using only on-board quadrotor sensors and an inertial tracking position system (e.g. Optitrack camera, GPS). To this end, a detailed quadrotor flight dynamics model is presented using identified aerodynamic coefficients and wind velocity components along the three axes. Then, a decomposition of dynamical equations is performed in known and unknown terms to be estimated. Thanks to this decomposition, the estimation algorithms are built and finally tested and validated in numerical experiments, against the introduced sensors' noise

Wind rejection via quasi-continuous sliding mode technique to control safely a mini drone

International audienceThe objective of this paper is to show how to build a nonlinear robust control law, which ensures trajectory tracking for a drone quadrotor under unpredictable wind perturbations. The first step is to find the aerodynamic forces and moments using a combination of momentum and blade element theory. Then the model is rewritten in state-space form, where the control inputs are selected to be proportional to the squares of rotor angular velocities. The other terms dependent linearly on rotors and wind velocities are considered as disturbances. Such a decomposition of thrust and selection of disturbances are almost exact in the hover flight. In literature, fixed bounds are often assumed on each component of the disturbance input vector, but for synthesis of the proposed control law, the big issue is that the disturbance depends on wind signals, the control itself, and state of the system. Chattering effects and their reduction are analysed and investigated in the last part of the paper by introducing rotors dynamics in control design. High order sliding mode control is applied and the recent tool of quasi-continuous sliding mode control is analyzed. Results of numeric experiments demonstrate the effectiveness of the proposed controls

Optimal input design for aircraft parameter estimation

International audienceAn optimal input design technique for aircraft parameter estimation is presented in this paper. The original idea is the combination of a dynamic programming method with a gradient algorithm for the optimal input synthesis. This approach allows to include realistic practical constraints on the input and output variables. A description of this approach is presented, followed by an example concerning an aircraft longitudinal flight

Delay system identification applied to the longitudinal flight of an aircraft through a vertical gust

International audienceThis paper deals with modelling and identification of aircraft dynamic entering a vertical gust. The identification approach initiated in (Fliess 2003) falls under a prospect for identification from tests carried out in the Flight Analysis Laboratory of the DCSD of ONERA in Lille. The plane is considered into various elements which consist in the fuselage, the wing and the tail. The model incorporates delays linked to the aircraft passage through the atmospheric turbulence

An optimal input design procedure

International audienceThis technical communique presents a method which aims at improving input design searching in some dynamical systems. The original idea of the proposed method is the combination of a dynamic programming method working on square wave inputs followed by a Quasi-Newton algorithm working on infinite differential switching mode inputs. These infinite differential functions approximate square wave inputs in order to enlarge the set of admissible inputs while ensuring a reasonable computation requirement which is not the case of classical methods based on dynamic programming only. Moreover, they correspond to practical inputs. The precise description of the approach is followed by an application in aerospace sciences

On sliding mode control design for UAV using realistic aerodynamic coefficients

International audienceThe goal of this paper is to design a control of mini quadrotor under wind perturbations. Taking into account a detailed unmanned aerial vehicle (UAV) model, the aim is to find a sliding mode control law minimizing the impact of the wind field on UAV dynamics. For this purpose an aerodynamic modelization of external disturbance is introduced. After that, upper bounds of these disturbances are computed. Lastly, the sliding mode altitude and attitude controls are designed. The peculiarity of the considered case is that the disturbance upper bounds depend on the control amplitude itself (i.e. the system is nonlinear in control), which leads to a new procedure for the control tuning presented in the paper. The results of numeric experiments demonstrate the effectiveness of the obtained controls, and the comparisons with a conventional first order sliding mode control, having the function sign proportional to a constant gain, and a recent quasi-continuous sliding mode control are also given

On sliding mode control design for UAV using realistic aerodynamic coefficients

International audienceThe goal of this paper is to design a control of mini quadrotor under wind perturbations. Taking into account a detailed unmanned aerial vehicle (UAV) model, the aim is to find a sliding mode control law minimizing the impact of the wind field on UAV dynamics. For this purpose an aerodynamic modelization of external disturbance is introduced. After that, upper bounds of these disturbances are computed. Lastly, the sliding mode altitude and attitude controls are designed. The peculiarity of the considered case is that the disturbance upper bounds depend on the control amplitude itself (i.e. the system is nonlinear in control), which leads to a new procedure for the control tuning presented in the paper. The results of numeric experiments demonstrate the effectiveness of the obtained controls, and the comparisons with a conventional first order sliding mode control, having the function sign proportional to a constant gain, and a recent quasi-continuous sliding mode control are also given

Biogenic amines in fermented foods

Food-fermenting lactic acid bacteria (LAB) are generally considered to be non-toxic and non-pathogenic. Some species of LAB, however, can produce biogenic amines (BAs). BAs are organic, basic, nitrogenous compounds, mainly formed through decarboxylation of amino acids. BAs are present in a wide range of foods, including dairy products, and can occasionally accumulate in high concentrations. The consumption of food containing large amounts of these amines can have toxicological consequences. Although there is no specific legislation regarding BA content in many fermented products, it is generally assumed that they should not be allowed to accumulate. The ability of microorganisms to decarboxylate amino acids is highly variable, often being strain specific, and therefore the detection of bacteria possessing amino acid decarboxylase activity is important to estimate the likelihood that foods contain BA and to prevent their accumulation in food products. Moreover, improved knowledge of the factors involved in the synthesis and accumulation of BA should lead to a reduction in their incidence in foods.This work was funded by the EU commission in the framework of the BIAMFOOD project (Controlling Biogenic Amines in Traditional Food Fermentations in Regional Europe—project No. 211441).Peer Reviewe