Method and apparatus for determining design modification effects on a computerized engineering model

1. A computerized system for evaluating design changes to a computerized model, comprising:

a computer programmed to:

conduct finite element analysis on a quantity of interest for a base design of the computerized model to determine a primary field;

derive an adjoint field for the quantity of interest of the base design;

accept an input for a design change of the computerized model from a user;

determine a performance metric of the design change for the computerized model as a function of the primary field and the adjoint field without finite element analysis of the computerized model as modified by the design change; and

output the performance metric to an electronic display;

wherein the performance metric is a range of values representing a lower bound for the performance metric and an upper bound for the performance metric based on the effect of the design change.

2. A computerized system for evaluating design changes to a computerized model, comprising:

a computer programmed to:

conduct finite element analysis on a quantity of interest for a base design of the computerized model to determine a primary field;

derive an adjoint field for the quantity of interest of the base design;

accept an input for a design change of the computerized model from a user;

determine a performance metric of the design change for the computerized model as a function of the primary field and the adjoint field without finite element analysis of the computerized model as modified by the design change;

output the performance metric to an electronic display; and

determine a value for the performance metric without a finite design feature and then determine the effect of the design change, wherein the design change includes the addition of the finite design feature to the computerized model.

3. The computerized system of claim 1 wherein the design change is for a self-equilibrating design feature of the computerized model.

4. The computerized system of claim 1 wherein the computer is further programmed to iteratively receive inputs for multiple differing design changes, determine an effect of each of the design changes in real-time, and output performance metrics for each design change to the electronic display in real-time.

5. The computerized system of claim 4 wherein the computer is further programmed to compare the performance metrics for the multiple design changes and automatically determine an optimal design change from the comparison.

6. A method embodied in a non-transitory computer-readable medium that when executed by a processor causes the processor to determine design modification effects on a computerized engineering model by:

defining a plurality of finite design features;

meshing the plurality of finite design features into a computerized model;

selecting a quantity of interest for the computerized model;

conducting finite element analysis on the quantity of interest for the computerized model to determine a primary field;

deriving an adjoint field for the quantity of interest for the computerized model;

redefining one of the finite design features; and

determining a performance metric for the redefined one of the finite design features as a function of the primary field and the adjoint field, the performance metric for the computerized model being independent of the computerized model;

wherein the performance metric is a range of values representing a lower bound for the performance metric and an upper bound for the performance metric based on the effect of the design change.

7. The method of claim 6 wherein the determining includes generating a range of values for the performance metric based on the redefined design feature.

8. The method of claim 7 further comprising presenting multiple redefinitions of the finite design feature, re-determining the performance metric for each redefinition, and selecting an optimized redefinition based on the range of values generated for each redefinition.

9. The method of claim 7 wherein the one finite design feature has a shape, size and location and wherein redefining the one finite design feature includes varying at least one of the shape, size and location of the one finite design feature.

10. The method of claim 7 further comprising incorporating the redefined finite design feature into the computerized model and then remeshing the computerized model.

11. The method of claim 6 further comprising iteratively redefining the one finite design feature and determining the performance metric for each iterative finite design feature.

12. The method of claim 11 further comprising comparing the performance metric from each iterative finite design feature and automatically determining an optimized finite design feature from the performance metrics.

13. A computer aided design tool having a computer programmed to execute a non-transitory computer-readable medium that causes the computer to:

assemble a plurality of design features into a computerized model and perform finite element analysis on a quantity of interest of the computerized model to determine a primary field;

derive an adjoint field for the quantity of interest of the computerized model;

redefining one of the design features;

determining a performance metric for the redefined one of the design features as a function of the primary field and the adjoint field;

determine an expected value for the performance metric;

iteratively redefine the one of the design features of the computerized model;

determine values for the performance metric for each redefined design feature without performing finite element analysis on the computerized model; and

determine an optimized modification of the design feature from the values for the performance metric;

wherein the performance metric is a range of values representing a lower bound for the performance metric and an upper bound for the performance metric based on the effect of the redefined design feature.

14. The computer aided design tool of claim 13 wherein the computer is further programmed to display the values for the performance metric associated with the iterative redefinitions of the design feature in real-time on a computer monitor.

15. The computer aided design tool of claim 14 wherein the computer is further programmed to determine, in real-time, a lower bound and an upper bound for the performance metric for each of the redefinitions of the design feature and display the bounds on the computer monitor.

16. The computer aided design tool of claim 15 wherein the computer is further programmed to determine, in real-time, a single estimated value for the performance metric for each of the redefinitions and display the single estimated values on the computer monitor.

17. The computerized system of claim 2 wherein the performance metric is a single estimated value.