Computer aided design method for creating a surface in a complex system

1. A method for designing a component of a gas turbine engine, said component being one of a fan, a compressor, and a turbine, the method being applied by a computer for creating, from a first axisymmetrical surface, a second surface belonging to said component, said second surface having to observe at least one constraint, the method comprising:

modeling, using a processor of said computer, said first axisymmetrical surface, while observing said at least one constraint with parameters, said modeling step including:

discretizing, using said processor, to obtain points of said first axisymmetrical surface located at an intersection of said first axisymmetrical surface and a reference system surface;

reconstructing, using said processor, said first axisymmetrical surface from said points and from said at least one constraint, said reconstructing step including defining a parameterizable curve;

modifying, using said processor, at least one parameter associated to one point of said points, along a Z axis in a reference system; and

recording, using said processor, said second surface in a memory of said computer; wherein

said points being movable along a displacement direction, and each parameter of said parameters being a coordinate of one point of said points of said first axisymmetrical surface in said reference system;

said reference system being associated with at least one portion of said component and selected for said point for modeling said second surface and so that said Z axis of said reference system coincides with the displacement direction;

said parameterizable curve connecting at least two of said points located at the intersection of said first axisymmetrical surface and said reference system surface while observing at least one wireframe constraint, and being deformed by displacing the points connected by said curve along the Z axis of the reference systems associated with said points, and being connected while observing at least one surface constraint for reconstructing said first axisymmetrical surface; and

said at least one wireframe constraint and said at least one surface constraint are established from said at least one constraint.

2. The method for designing a component of a gas turbine engine according to claim 1 , wherein said reference system is associated with at least one of said points.

3. The method for designing a component of a gas turbine engine according to claim 1 or 2 , wherein said reference system is defined according to said first axisymmetrical surface and to said reference system surface including an intersection with said first axisymmetrical surface.

4. A method for creating a computer model used in a CAD tool comprising:

creating a second surface under a constraint from a first axisymmetrical surface according to a method in accordance with claim 3 , said model having as an input said first axisymmetrical surface and a reference system surface, parameters of said method for creating a surface being parameters of said computer model.

5. A method for optimizing a second surface from a first axisymmetrical surface, the method comprising:

defining at least one constraint or one optimization criterion, the value of said at least one constraint or one optimization criterion depending on said second surface;

establishing an experimental plane defining a plurality of combinations including different values of parameters;

creating said second surface according to a method in accordance with claim 1 for each of said combinations;

measuring and saving the optimization criterion of said second surface corresponding to each of said combinations; and

selecting the parameters of the combination for which said optimization criterion is optimum.

6. The optimization method according to claim 5 , wherein the combinations of said experimental plane further include different first axisymmetrical surfaces and several reference system surfaces, and the method further comprises:

creating a computer model including said second surface, said creating including a step for instantiation of said model and modifying the parameters of said model with one of the combinations of the experimental plane.

7. A non-transitory storage medium readable by a computer on which is recorded a computer program, wherein the program, when executed, causes the computer to perform the method according to any of claim 1 or 5 .

8. A computer including the storage medium according to claim 7 .

9. A non-transitory storage medium readable by a computer on which is recorded a computer program, wherein the program, when executed, causes the computer to perform the method according to claim 4 .

10. A computer including the storage medium according to claim 9 .

11. A non-transitory storage medium readable by a computer on which is recorded a computer program, wherein the program, when executed, causes the computer to perform the method according to claim 6 .

12. A computer including the storage medium according to claim 11 .