Patents by Inventor Christophe David

Christophe David has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of simulation of unsteady aerodynamic loads on an external aircraft structure
    Patent number: 9767229
    Abstract: The invention relates to a method for simulating the unsteady aerodynamic loads being exerted on the external structure of an aircraft, notably in the context of a simulation of the buffeting of a wing surface in an airflow. The method includes a step of measurement of pressure (410) at different points of a grid, a step of calculation of the spectral density at these points (420) followed by extrapolation/interpolation operations to calculate the missing measurements (430), a step of estimation of the pressure coherence (440) for each pair of points of the grid, a step of estimation of the interspectral pressure density (450) for these same pairs of points, from the coherence thus estimated, and a step of calculation of the aerodynamic loads (460) by summing the real part of the interspectral density for the area of the wing surface having a separation of the boundary layer.
    Type: Grant
    Filed: September 11, 2013
    Date of Patent: September 19, 2017
    Assignee: Airbus Operations (S.A.S.)
    Inventors: Raul Calderon, Christophe David
  • METHOD OF SIMULATION OF UNSTEADY AERODYNAMIC LOADS ON AN EXTERNAL AIRCRAFT STRUCTURE
    Publication number: 20140081609
    Abstract: The invention relates to a method for simulating the unsteady aerodynamic loads being exerted on the external structure of an aircraft, notably in the context of a simulation of the buffeting of a wing surface in an airflow. The method includes a step of measurement of pressure (410) at different points of a grid, a step of calculation of the spectral density at these points (420) followed by extrapolation/interpolation operations to calculate the missing measurements (430), a step of estimation of the pressure coherence (440) for each pair of points of the grid, a step of estimation of the interspectral pressure density (450) for these same pairs of points, from the coherence thus estimated, and a step of calculation of the aerodynamic loads (460) by summing the real part of the interspectral density for the area of the wing surface having a separation of the boundary layer.
    Type: Application
    Filed: September 11, 2013
    Publication date: March 20, 2014
    Applicant: AIRBUS OPERATIONS (SAS)
    Inventors: Raul CALDERON, Christophe David
  • Industrial scale process for the preparation of 2-hydroxy-4-methylbutyric acid using a nitrilase
    Patent number: 6180359
    Abstract: This invention relates to a process for the preparation of 2-hydroxy-4-methylthiobutyric acid or the ammonium salt of 2-hydroxy-4-methylthiobutyric acid by enzymatic hydrolysis of 2-hydroxy-4-methylthiobutyronitrile, comprising: a) preparing a biological material having a nitrilase activity; b) immobilizing the biological material, c) exposing the 2-hydroxy-4-methylthiobutyronitrile to the biological material thus immobilized to obtain the ammonium salt of 2-hydroxy-4-methylthiobutyric acid; and d) optionally converting the salt obtained to the corresponding acid.
    Type: Grant
    Filed: October 24, 1997
    Date of Patent: January 30, 2001
    Assignee: Aventis Animal Nutrition S.A.
    Inventors: Olivier Favre-Bulle, J{acute over (e)}r{circumflex over (o)}me Pierrard, Christophe David, Philippe Morel, Dominique Horbez