Method and device for determining critical buffeting loads on a structure of an aircraft
First Claim
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1. A method for determining critical loads generated by buffeting on a structure (S) of an airplane (A), said method comprising:
- a) conducting trials in a blowing unit on an airplane model, said trials comprising;
simulating conditions for which some flow burble occurs on at least one part of a surface of the airplane (A); and
carrying out, for such conditions, measurements using stationary pressure sensors, instationary pressure sensors and accelerometers arranged on said model;
b) using at least some of such measurements, the flow burble areas are determined on said structure (S) of the airplane (A);
c) implementing an aerodynamic model for determining, using the measurements from steps a), in the flow burble areas as determined from step b), a pressure field resulting in the structure (S) buffeting;
d) integrating the determined pressure field so as to obtain the overall stresses and moments generated by buffeting;
e) calculating, using such overall stresses and moments, the stresses that the structure (S) is to bear, such stresses comprising aerodynamic stresses caused by buffeting, induced aerodynamic stresses, inertia stresses and damping stresses; and
f) determining the critical loads due to buffeting using the stresses as calculated in step e).
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Abstract
A method and device for determining critical buffeting loads on a structure of an aircraft is disclosed. The device (1) comprises means (2, UC) implementing a semi-empirical method for determining the critical loads generated by some buffeting on the structure of the airplane.
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Citations
10 Claims
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1. A method for determining critical loads generated by buffeting on a structure (S) of an airplane (A), said method comprising:
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a) conducting trials in a blowing unit on an airplane model, said trials comprising; simulating conditions for which some flow burble occurs on at least one part of a surface of the airplane (A); and carrying out, for such conditions, measurements using stationary pressure sensors, instationary pressure sensors and accelerometers arranged on said model; b) using at least some of such measurements, the flow burble areas are determined on said structure (S) of the airplane (A); c) implementing an aerodynamic model for determining, using the measurements from steps a), in the flow burble areas as determined from step b), a pressure field resulting in the structure (S) buffeting; d) integrating the determined pressure field so as to obtain the overall stresses and moments generated by buffeting; e) calculating, using such overall stresses and moments, the stresses that the structure (S) is to bear, such stresses comprising aerodynamic stresses caused by buffeting, induced aerodynamic stresses, inertia stresses and damping stresses; and f) determining the critical loads due to buffeting using the stresses as calculated in step e). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device for determining the critical loads generated by some buffeting on a structure (S) of an airplane (A), said device (1) comprising:
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first means (2) for conducting trials in a blowing unit on a model of an airplane, said trials comprising simulating conditions for which some flow burble occurs on at least one part of a surface of the airplane (A), and carrying out, for such conditions, measurements using stationary pressure sensors, instationary pressure sensors and accelerometers being arranged on said model; and second means (4) for determining, using at least some of such measurements, flow burble areas on said structure (S) of the airplane (A); third means (5) for carrying out an aerodynamic modelling so as to determine, using the measurements as implemented during trials in a blowing unit, in the flow burble areas as determined by said second means (4), a pressure field, generating some buffeting of the structure (S); fourth means (7) for integrating the thus determined pressure field so as to obtain the overall stresses and moments generated by the buffeting; fifth means (9) for calculating, by means of such overall stresses and moments, the stresses the structure (S) is to bear, such stresses comprising aerodynamic stresses generated by buffeting, induced aerodynamic stresses, inertia stresses and damping stresses; and sixth means (11) for determining the critical loads generated by buffeting using the stresses as calculated by said fifth means (9).
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Specification