METHOD OF PART VERIFICATION

• US 20140278265A1
• Filed: 03/14/2013
• Published: 09/18/2014
• Est. Priority Date: 03/14/2013
• Status: Active Grant

• Current Assignee: Spirit Aerosystems Incorporated (Spirit Aerosystems Holdings Incorporated)
• Original Assignee: Spirit Aerosystems Incorporated (Spirit Aerosystems Holdings Incorporated)
• Inventors: Anderson, David Scott, Miller, Clark Ray, Plourde, Ryan
• Granted Patent: US 9,348,948 B2
• Time in Patent Office: Days
• US Class Current: 703/1
• CPC Class Codes: G06F 30/00 Computer-aided design [CAD]
• CPC Class Codes: G06T 19/20 Editing of 3D images, e.g. changing shapes or colours, aligning objects or positioning parts
• CPC Class Codes: G06T 2219/2021 Shape modification

Abstract

An automated method of verifying a part includes scanning the part to create a three-dimensional computer-based model of the part, indexing the computer-based model of the part to a three-dimensional nominal part design, and adjusting the shape of the model to generate an adjusted model with a shape corresponding to the shape of the nominal part design. The adjusted model is compared to the nominal part design to identify variations between the size and configuration of the adjusted model and the target part design are determined. Furthermore, it is determined whether adjusting the part to conform to the nominal part design would compromise the structure of the part.

Claims

1. A method of verifying a part, the method comprising:

scanning the part to create a three-dimensional computer-based model of the part;

indexing the computer-based model of the part to a three-dimensional nominal part design;

adjusting the shape of the model to generate an adjusted model with a shape corresponding to the shape of the nominal part design;

determining variations between the size and configuration of the adjusted model and the nominal part design; and

using information collected while adjusting the shape of the model, determining whether adjusting the part to conform to the nominal part design would compromise the structure of the part.

2. The method of claim 1, further comprising scanning the part in an unrestrained position to create the three-dimensional computer-based model of the part.

3. The method of claim 1, the step of determining a difference between the size and configuration of the adjusted model and the nominal part design further comprising the steps of—

determining a difference between one or more dimensions of the adjusted model and corresponding dimensions of the design; and

determining a difference between the position of one or more features of the adjusted model and corresponding features of the nominal part design.

4. The method of claim 1, the step of adjusting the shape of the model including using finite element analysis to change the shape of the model in a manner constrained by the physical characteristics of the part.

5. The method of claim 1, further comprising using finite element analysis to determine whether adjusting the part to conform to the nominal part design would compromise the structure of the part.

6. The method of claim 5, further comprising generating stress vectors when adjusting the shape of the model and using the stress vectors to determine whether adjusting the part to conform to the nominal part design would compromise the structure of the part.

7. The method of claim 1, the step of determining whether adjusting the part to conform to the nominal part design would compromise the structure of the part involving determining whether adjusting the part would cause plastic deformation in the part.

8. The method of claim 1, the step of create a three-dimensional computer-based model of the part including creating a three-dimensional point cloud representing surface points of the scanned part.

9. The method of claim 1, further comprising selecting a plurality of fixture points on the nominal part design, the step of indexing the model of the part to the nominal part design including identifying a plurality of points on the model that correspond to the fixture points.

10. The method of claim 9, the step of adjusting the shape of the model including simulating, on the model, the effect of applying one or more loads to the part in a manner that causes the shape of the model to change, wherein points on the model corresponding to the fixture points remain fixed relative to one another as the shape of the model changes.

11. The method of claim 10, wherein simulating the effect of applying one or more loads to the model includes simulating the effect of applying at least two loads that cause the model to deform in at least two different directions.

12. The method of claim 1, the nominal part design including a three-dimensional mesh comprising a plurality of nodes and material property information defining relationships between the nodes.

13. A method of verifying a part, the method comprising:

scanning the part in an unrestrained position to create a point cloud comprising a plurality of points each representing a point on the surface of the part;

indexing the point cloud to a mesh based on a nominal part design;

adjusting the shape of the point cloud to generate an adjusted point cloud with a shape corresponding to the shape of the mesh, wherein adjusting the point cloud includes—

(a) selecting a plurality of different load points on the point cloud,

(b) determining a gap between the point cloud and the mesh at each of the load points,

(c) identifying the largest gap,

(d) adjusting the shape of the point cloud to simulate applying a load to the point cloud at the load point corresponding to the largest gap, the magnitude of the simulated load being sufficient to reduce the largest gap to within a tolerance, and

(e) repeating steps (b) through (d) until all of the gaps are within the tolerance,

determining variances between the size and configuration of the adjusted point cloud and the mesh; and

using information collected while adjusting the shape of the point cloud, determining whether adjusting the part to conform to the mesh would compromise the structure of the part.

14. The method of claim 13, step (d) including using finite element analysis to change the shape of the point cloud in a manner constrained by the physical characteristics of the part.

15. The method of claim 13, wherein adjusting the shape of the point cloud includes adjusting only positions of the load points in response to the simulated load.

16. The method of claim 13, further comprising using finite element analysis to determine whether adjusting the part to conform to the mesh would compromise the structure of the part.

17. The method of claim 13, the step of determining whether adjusting the part to conform to the mesh would compromise the structure of the part involving determining whether adjusting the part would cause plastic deformation in the part.

18. The method of claim 13, further comprising selecting a plurality of fixture points on the mesh, the step of indexing the point cloud to the mesh including identifying a plurality of points in the point cloud that correspond to the fixture points.

19. The method of claim 18, the step of adjusting the shape of the point cloud including simulating, on the point cloud, the effect of applying one or more loads to the part in a manner that causes the shape of the point cloud to change, wherein points on the point cloud corresponding to the fixture points remain fixed relative to one another as the shape of the point cloud changes.

20. A method of verifying a part, the method comprising:

scanning the part to create a three-dimensional computer-based model of the part;

indexing the computer-based model of the part to a three-dimensional nominal part design;

adjusting the shape of the nominal part design to generate an adjusted design with a shape corresponding to the shape of the computer-based model;

determining variations between the size and configuration of the adjusted design and the model; and

using information collected while adjusting the shape of the design, determining whether adjusting the part to conform to the nominal part design would compromise the structure of the part.