Air intake structure for aircraft engine
AssigneeAirbus France
InventorAlain Porte
Life of this patent
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Abstract
The aft stiffening frame of an air intake structure for an aircraft engine nacelle is made with an inflection area such that the part between the inflection area and one of its ends could be subjected to a large deformation when a constraint occurs in the direction of the frame part defined by the inflection area and its other end, usually normal to the casing. This particular shape of the aft stiffening frame makes it possible to improve its flexibility so that the air intake structure has better resistance to severe deformed shapes that could occur, for example, when a fan breaks on a wide body aircraft.
Claims19
Stiffening frame for an air intake structure for an aircraft engine, comprising a first end portion, a second end portion, and an intermediate portion located between the first and second end portions at a first length from the first end portion, the frame approximately defining a first plane between the first end portion and the intermediate portion, the intermediate portion being an inflection area such that the curvature of the frame between the intermediate portion and the second end portion is zero, the height of the stiffening frame defined between the first end portion and the normal projection of the second end portion onto the first plane being between a first height and, when the stiffening frame is compressed by a force with a component perpendicular to the direction of the second end portion and in the first plane, a second height less than the first height and equal or greater to the first length.
Stiffening frame for an air intake structure for an aircraft engine, comprising a first end portion, an intermediate portion, and a second end portion, the intermediate portion being an inflection portion such that in a section orthogonal to the end portions, the frame approximately defines a first straight line between the first end portion and the intermediate portion, and it defines a regular non-null curve between the second end portion and the inflection portion, the tangent to the curve at the second end portion being perpendicular to the first plane corresponding to the first straight line, the height of the stiffening frame defined between the first end portion and the normal projection of the second end portion onto the first plane being between a first height and, when the stiffening frame is compressed by a force with a component which is perpendicular to the direction of the second end portion and in the first plane, a second height at least 20% less than the first height.
Intake structure stiffening frame for an aircraft engine, comprising a first and a second end portions and defining a regular curve between the first and second end portions, the stiffening frame capable of being compressed by a force with a component in the direction of the second end portion towards the first end portion.
Dependencies are inferred from the claim text.