Influence of Flap Angle on the Aeroelastic Behavior of Wing- Flap Configuration Using Fully Coupled Structure-Fluid Interaction Model

The influence of trailing edge flap angle on the aeroelastic behavior of a vibrating wing-flap configuration is investigated in this work. For this purpose an aeroelastic numerical model with fully coupled structure-fluid interaction is developed. The flow and structural solvers are coupled via successive iterations within each physical time step. The aerodynamic model is based on a hybrid unsteady panel method which is still a good approach to calculate the unsteady loads. While the nonlinear plate equation solved by an assumed mode method is used to represent the structure wing model. The results for a vibrating rectangular wing-flap configuration in low subsonic attached flow are presented, including the effect of flap angle on the unsteady pressure coefficient, time history of lifting coefficient and aeroelastic behavior of the wing. These results clearly show the effect of strong structure-fluid interaction and illustrate the utility of the present model which may be used in the preliminary stage of the wing design

Diffusion and Electrical Activation After a Rapid Thermal Annealing of an As and B-Co-Implanted Polysilicon Layer

This work provides an experimental insight into the physical mechanisms involved in the co-diffusion of arsenic and boron in polysilicon/monocrystalline Si bilayers, during the formation of shallow N$^+$ emitters for the BiCMOS technology. The RTA-induced redistribution of As and B successively implanted in a 380 nm LPCVD polysilicon layer is studied by SIMS measurements. Hall effect, as well as sheet resistance measurements, show that the electrical activation of dopants in the co-implanted structures is satisfactory from a RTA temperature of 1100 °C.Nous présentons ici un travail expérimental mettant en évidence les mécanismes physiques intervenant dans la co-diffusion de l'arsenic et du bore dans une bicouche polysilicium sur silicium polycrystallin, durant la formation des émetteurs étroits N$^+$ destinés à la technologie BiCMOS. La redistribution de As et B induite par un RTA, successivement implantés dans une couche de polysilicium de 380 nm, est appréhendée par des mesures SIMS. Des mesures par effet Hall et par résistances par carrés mettent en évidence que l'activité électrique des dopants dans les structures implantées est satisfaisante à partir d'une température de 1100 °C

Aeroelastic Behavior of a Wind Turbine Blade by a Fluid -Structure Interaction Analysis

In this paper, a numerical model for fluid-structure interaction (FSI) analysis is developed for investigating the aeroelastic response of a single wind turbine blade. The Blade Element Momentum (BEM) theory was adopted to calculate the aerodynamic forces considering the effects of wind shear and tower shadow. The wind turbine blade was modeled as a rotating cantilever beam discretized using Finite Element Method (FEM) to analyze the deformation and vibration of the blade. The aeroelastic response of the blade was obtained by coupling these aerodynamic and structural models using a coupled BEM-FEM program written in MATLAB. The governing FSI equations of motion are iteratively calculated at each time step, through exchanging data between the structure and fluid by using a Newmarks implicit time integration scheme. The results obtained from this paper show that the proposed modeling can be used for a quick assessment of the wind turbine blades taking the fluid-structure interaction into account. This modeling can also be a useful tool for the analysis of airplane propeller blades