SYMMETRIC RANDOM SCATTER PROCESS FOR PROBABILISTIC MODELING SYSTEM FOR PRODUCT DESIGN

• US 20100250202A1
• Filed: 06/30/2006
• Published: 09/30/2010
• Est. Priority Date: 04/08/2005
• Status: Active Grant

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Grichnik, Anthony J., Seskin, Michael
• Granted Patent: US 7,877,239 B2
• Time in Patent Office: Days
• US Class Current: 703/2
• CPC Class Codes: G06F 2111/08 Probabilistic or stochastic CAD
• CPC Class Codes: G06F 30/20 Design optimisation, verification or simulation optimisation, verification or simulation of circuit designs G06F30/30

Abstract

A method is provided for designing a product. The method may include obtaining data records relating to one or more input variables and one or more output parameters associated with the product and selecting one or more input parameters from the one or more input variables. The method may also include generating a computational model indicative of interrelationships between the one or more input parameters and the one or more output parameters based on the data records and providing a set of constraints to the computational model representative of a compliance state for the product. Further the method may include using the computational model and the provided set of constraints to generate statistical distributions for the one or more input parameters based on a symmetric random scatter process and the one or more output parameters. The one or more input parameters and the one or more output parameters represent a design for the product.

Claims

1. A method for designing a product performed by a processor associated with a computer and comprising the steps of:

obtaining data records relating to one or more input variables and one or more output parameters of a configuration of the product;

selecting one or more input parameters from the one or more input variables;

generating a computational model for the product configuration, the computational model indicative of interrelationships between the one or more input parameters and the one or more output parameters based on the data records;

providing a set of constraints to the computational model representative of a compliance state for the product;

using the computational model and the provided set of constraints to generate statistical distributions for the one or more input parameters based on a symmetric random scatter process and the one or more output parameters, the symmetric random scatter process including;

obtaining initial ranges of the input parameters;

creating a plurality of model data records including at least one symmetric model data record based on the initial ranges of the input parameters;

determining a candidate set of values of the input parameters based on the plurality of model data records; and

determining the statistical distributions of the one or more input parameters based on the candidate set; and

identifying a desired range of input parameters for the product configuration based on the generated statistical distributions for the one or more input parameters.

2. The method of claim 1, further including using the computation model to generate nominal values for the one or more input parameters and the one or more output parameters.

3. The method of claim 2, further including modifying the design for the product by adjusting at least one of the statistical distributions and the nominal values for any of the one or more input parameters and the one or more output parameters.

4. The method of claim 1, wherein the symmetric random scatter process further includes:

determining the candidate set of values of the input parameters based further on maximizing a zeta statistic using a genetic algorithm, wherein the zeta statistic ζ

is represented by;

5. The method of claim 4, wherein the creating further includes:

creating a centroid data record corresponding to midpoint values of the initial ranges of the input parameters;

randomly creating a plurality of sample data records of the input parameters within the initial ranges of the input parameters;

creating a plurality of respective symmetric random scatter data records of the plurality of sample data records as symmetric scatter of the plurality of sample data records with respect to the centroid data record; and

creating the plurality of data records by combining the centroid data record, the sample data records, and the symmetric random scatter data records.

6. The method of claim 4, further including:

comparing the statistical distributions of the input parameters with the initial ranges of input parameters; and

determining whether the statistical distributions of the input parameters match the initial ranges of input parameters.

7. The method of claim 6, further including:

if the statistical distributions of the input parameters do not match the initial ranges of the input parameters, changing the initial ranges of the input parameters to the same as the statistical distributions of the input parameters; and

re-determining the statistical distributions of the input parameters based on the changed initial ranges until the statistical distributions of the input parameters match the respective range of the input parameters.

8. The method of claim 7, further including graphically displaying on a display:

the statistical distribution for the one or more input parameters and the one or more output parameters; and

nominal values for the one or more input parameters and the one or more output parameters.

9. The method of claim 8, further including graphically displaying on the display:

statistical information for the one or more input parameters and the one or more output parameters obtained based on the data records.

10. A computer readable storage medium storing a set of instructions for enabling a processor associated with a computer to:

obtain data records relating to one or more input variables and one or more output parameters associated with a configuration of a product to be designed;

select one or more input parameters from the one or more input variables;

generate a computational model for the product configuration, the computational model indicative of interrelationships between the one or more input parameters and the one or more output parameters based on the data records;

provide a set of constraints to the computational model representative of a compliance state for the product;

use the computational model and the provided set of constraints to generate statistical distributions for the one or more input parameters based on a symmetric random scatter process and the one or more output parameters, the symmetric random scatter process including;

obtaining initial ranges of the input parameters;

creating a plurality of model data records including at least one symmetric model data record based on the initial ranges of the input parameters;

determining a candidate set of values of the input parameters based on the plurality of model data records; and

determining the statistical distributions of the one or more input parameters based on the candidate set; and

identifying a desired range of input parameters for the product configuration based on the generated statistical distributions for the one or more input parameters.

11. The computer readable storage medium of claim 10, wherein the symmetric random scatter process further includes:

determining the candidate set of values of input parameters based further on maximizing a zeta statistic using a genetic algorithm,

wherein the zeta statistic ζ

is represented by;

12. The computer readable storage medium of claim 11, further storing instructions for enabling the processor to:

create a centroid data record corresponding to midpoint values of the initial ranges of the input parameters;

randomly create a plurality of sample data records of the input parameters within the initial ranges of the input parameters;

create a plurality of respective symmetric random scatter data records of the plurality of sample data records as symmetric scatter of the plurality of sample data records with respect to the centroid data record; and

create the plurality of data records by combining the centroid data record, the sample data records, and the symmetric random scatter data records.

13. The computer readable storage medium of claim 11 further storing instructions for enabling the processor to:

compare the statistical distributions of the input parameters with the initial ranges of input parameters; and

determine whether the statistical distribution of the input parameters match the initial ranges of input parameters.

14. The computer readable storage medium of claim 11 further storing instructions for enabling the processor to graphically display:

the statistical distributions for the one or more input parameters and the one or more output parameters; and

nominal values for the one or more input parameters and the one or more output parameters.

15. The computer readable storage medium of claim 14, further including instructions for enabling the processor to graphically display:

statistical information for the one or more input parameters and the one or more output parameters obtained based on the data records.

16. A computer-based product design system, comprising:

a database containing data records relating one or more input variables and one or more output parameters associated with a product to be designed; and

a processor configured to;

obtain data records relating to one or more input variables and one or more output parameters associated with a configuration of the product;

select one or more input parameters from the one or more input variables;

generate a computational model for the product configuration, the computation model indicative of interrelationships between the one or more input parameters and the one or more output parameters based on the data records;

provide a set of constraints to the computational model representative of a compliance state for the product;

use the computational model and the provided set of constraints to generate statistical distribution for the one or more input parameters based on a symmetric random scatter process and the one or more input parameters, the symmetric random scatter process including;

obtaining initial ranges of the input parameters;

creating a plurality of model data records including at least one symmetric model data record based on the initial ranges of the input parameters;

determining a candidate set of values of the input parameters based on the plurality of model data records; and

determining the statistical distributions of the one or more input parameters based on the candidate set; and

identify a desired range of input parameters for the product configuration based on the generated statistical distributions for the one or more input parameters.

17. The computer-based product design system of claim 16, wherein the symmetric random scatter process further includes:

determining the candidate set of values of input parameters based further on maximizing a zeta statistic using a genetic algorithm,

wherein the zeta statistic ζ

is represented by;

18. The computer-based product design system of claim 17, wherein to use the computational model to generate statistical distributions, the processor is further configured to:

create a centroid data record corresponding to midpoint values of the initial ranges of the input parameters;

randomly create a plurality of sample data records of the input parameters within the initial ranges of the input parameters;

create a plurality of respective symmetric random scatter data records of the plurality of sample data records as symmetric scatter of the plurality of sample data records with respect to the centroid data record; and

create the plurality of data records by combining the centroid data record, the sample data records, and the symmetric random scatter data records.

19. The computer-based product design system of claim 16, further including:

a display;

wherein the processor is configured to display the statistical distributions for the one or more input parameters and the one or more output parameters; and

nominal values for the one or more input parameters and the one or more output parameters.

20. The computer-based product design system of claim 19, wherein the processor is configured to display statistical information for the one or more input parameters and the one or more output parameters obtained based on the data records.