METHOD OF OFF-LINE HYBRID SYSTEM ASSESSMENT FOR TEST MONITORING AND MODIFICATION

• US 20150081045A1
• Filed: 09/09/2014
• Published: 03/19/2015
• Est. Priority Date: 09/09/2013
• Status: Active Grant

• Current Assignee: MTS Systems Corporation (Illinois Tool Works Inc.)
• Original Assignee: MTS Systems Corporation (Illinois Tool Works Inc.)
• Inventors: Fricke, David M.
• Granted Patent: US 10,061,278 B2
• Time in Patent Office: Days
• US Class Current: 700/30
• CPC Class Codes: G01M 17/00 Testing of vehicles testing fluid tightness G01M3/00; testing elastic properties of bodies or chassis, e.g. torsion-testing, G01M5/00; testing alignment of vehicle headlight devices G01M11/06; testing of engines G01M15/00
• CPC Class Codes: G05B 13/04 involving the use of models or simulators
• CPC Class Codes: G06F 30/20 Design optimisation, verification or simulation optimisation, verification or simulation of circuit designs G06F30/30

Abstract

A method and an arrangement of controlling simulation of a coupled hybrid dynamic system comprising a component under test and a virtual model includes driving the physical component under test of the system on a test rig over a period of time to conduct a test by applying an initial test drive signal input to the test rig to generate a test rig response. At least a portion of the test rig response is inputted into the virtual model of the system to obtain a model response of the system. A condition of the physical component under test is assessed during at least a portion of the period of time to conduct the test based on comparing another portion of the test rig response with the model response where an output relating to the assessment is recorded or rendered.

Claims

1. An arrangement for controlling simulation of a coupled hybrid dynamic system, comprising:

a physical test rig configured to drive a physical component under test of the system on a test rig over a period of time to conduct a test by applying an initial test drive signal input to the test rig to generate a test rig response; and

a processor configured with a virtual model of the system, the processor configured to receive at least a portion of the test rig response into the virtual model of the system less the physical component under test and obtaining a model response of the system, the processor further configured to assess a condition of the physical component under test during at least a portion of the period of time to conduct the test based on comparing another portion of the test rig response with the model response and record or render an output.

2. The arrangement of claim 1 wherein the test rig response comprises a first component and a second component as a result of applying the initial test drive signal input to the test rig;

wherein the processor is configured to receive the first component of the test rig response and generate the model response of the system based on using the first component of the received test rig response and a virtual drive as inputs during the period of time to conduct the test; and

wherein said another portion of the test rig response comprises the second component; and

wherein the processor is configured to compare the second component of the test rig response with the model response to form a difference; and

wherein the output is based on the difference.

3. The arrangement of claim 2 wherein the processor is configured to obtain the difference at intermittent intervals during the period of time to conduct the test.

4. The arrangement of claim 2 wherein the processor is configured to obtain the difference continuously during the period of time to conduct the test.

5. The arrangement of claim 2 wherein the processor is configured to generate a new drive signal input to use during the period of time to conduct the test instead of the initial test drive signal input when a parameter based on the difference reaches a selected threshold.

6. The arrangement of claim 2 wherein the processor is configured to repeatedly generate a new drive signal input to use during the period of time to conduct the test when a parameter based on the difference reaches a selected threshold.

7. The arrangement of claim 5 wherein the parameter is a result of the difference comparing the second component of the test rig response with the model response.

8. The arrangement of claim 5 wherein the parameter is based on a rate of change of the difference.

9. The arrangement of claim 5 wherein the processor is configured to limit an extent of adjustment of a new drive signal with respect to an earlier drive signal.

10. The arrangement of claim 9 wherein the earlier drive signal is the initial test drive signal.

11. A method of controlling simulation of a coupled hybrid dynamic system comprising a component under test and a virtual model, the method comprising:

driving the physical component under test of the system on a test rig by applying an initial test drive signal input to the test rig to generate a test rig response; and

inputting at least a portion of the test rig response into the virtual model of the system and obtaining a model response of the system;

generating a new test rig drive signal based selectively on comparing another portion of the test rig response with the model response; and

using the new test rig drive signal in place of the initial test drive signal input.

12. The method of claim 11 wherein comparing another portion of the test rig response with the model response yields a difference.

13. The method of claim 12 wherein comparing comprises comparing the difference at intermittent intervals over the period of time to conduct a test.

14. The method of claim 12 wherein comparing comprises comparing the difference continuously over the period of time to conduct a test.

15. The method of claim 12 wherein generating the new drive signal input to use is based on a parameter of the difference reaching a selected threshold.

16. The method of claim 12 wherein generating a new drive signal input to use comprises repeatedly generating a new drive signal input when a parameter of the difference reaches a selected threshold.

17. The method of claim 15 wherein the parameter is a result of the difference comparing the second component of the test rig response with the model response.

18. The method of claim 15 wherein the parameter is based on a rate of change of the difference.

19. The method of claim 15 wherein the processor is configured to limit an extent of adjustment of the new drive signal with respect to an earlier drive signal.

20. The method of claim 19 wherein the earlier drive signal is the initial test drive signal.

21. A method of controlling simulation of a coupled hybrid dynamic system comprising a component under test and a virtual model less the physical component under test, the method comprising:

driving the physical component under test of the system on a test rig over a period of time to conduct a test by applying an initial test drive signal input to the test rig to generate a test rig response; and

inputting at least a portion of the test rig response into the virtual model of the system and obtaining a model response of the system; and

assessing a condition of the physical component under test during at least a portion of the period of time to conduct the test based on comparing another portion of the test rig response with the model response and record or render an output.