METHODS AND SYSTEMS FOR OFF-LINE CONTROL FOR SIMULATION OF COUPLED HYBRID DYNAMIC SYSTEMS

• US 20100088058A1
• Filed: 10/02/2008
• Published: 04/08/2010
• Est. Priority Date: 10/02/2008
• 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 8,135,556 B2
• Time in Patent Office: Days
• US Class Current: 702/113
• CPC Class Codes: G01M 17/0074 Details, e.g. roller construction, vehicle restraining devices

Abstract

Systems and methods are provided for controlling the simulation of a coupled hybrid dynamic system, comprising a physical test rig configured to drive the physical structure component of the system and to generate a test rig response as a result of applying a test rig drive signal that is input to the test rig. A processor is configured with a virtual model of the system. The processor receives the test rig response and generates a model response of the system based on the received test rig response and a virtual drive input. In a system response modeling step, the system is driven with a random input. The processor compares the test rig response with the model response, the difference being used to form a system dynamic response model for generating the test drive signal. In a test drive development step, an inverse of the system dynamic response model is used to iteratively reduce the difference between the model response and the test rig response below a defined threshold.

Claims

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

a physical test rig configured to drive a physical structural component of the system and to generate a test rig response as a result of applying a drive signal input to the test rig; and

a processor configured with a virtual model of the system, the processor receiving the test rig response and generating a model response of the system based on using a first part of the received test rig response and a virtual drive as inputs;

the processor further configured to compare a different, second part of the test rig response with the corresponding model response to form a difference, the difference being used by the processor to form a system dynamic response model for generating the test rig drive signal.

2. The arrangement of claim 1, wherein the processor is further configured to:

generate the test rig drive signal, receive the test rig response, generate a model response, compare the test rig response with the model response to generate a simulation process error, and reduce the error using an inverse of the system dynamic response model, iteratively until a difference between the model response and the test rig response is below a defined threshold.

3. The arrangement of claim 2, wherein the physical test rig drives the physical structural component and generates a test rig drive signal in real-time, and the processor compares the test rig response with the model response to generate a simulation process error off-line.

4. The arrangement of claim 3, wherein the test rig response includes a first component forming an input to the model of the system, and a second component forming an input for comparison with the model response to the input of the first component.

5. The arrangement of claim 4, wherein the first component is a measured force signal that forms an input signal to the model of the system.

6. The arrangement of claim 5, wherein the second component is a measured displacement signal and the model response is a displacement signal of the system.

7. The arrangement of claim 6, wherein the processor is further configured to compare the measured displacement signal with the displacement signal of the system to form a displacement difference, and to compare the displacement difference with a desired displacement different to form a simulation error signal.

8. The arrangement of claim 7, wherein the processor is further configured to generate a drive correction signal using an inverse of a system dynamic model.

9. The arrangement of claim 8, wherein the processor is further configured to combine the drive correction signal with the test rig drive signal to form an updated test rig signal to be input to the test rig as the test drive signal.

10. The arrangement of claim 9, wherein the system is a vehicle.

11. The arrangement of claim 4, wherein the first component is a measured displacement signal that forms an input signal to the model of the system.

12. The arrangement of claim 11, wherein the second component is a measured force signal and the model response is a force signal of the system.

13. A method of controlling simulation of a coupled hybrid dynamic system, comprising the steps of:

driving a physical structural component of the system on a test rig by applying a drive signal input to the test rig to generate a test rig response as a result, and

receiving the test rig response at a processor configured with a virtual model of the system and generating a model response of the system based on using a first part of the received test rig response as an input;

comparing a different, second part of the test rig response with the corresponding model response to form a difference; and

using the difference to form a system dynamic response model for generating the test rig drive signal.

14. The method of claim 13, further comprising:

applying a virtual drive, generating the test rig drive signal, receiving the test rig response, generating a model response, comparing the test rig response with the model response to generate a simulation process error, and reducing the error using an inverse of the system dynamic response model, iteratively until a difference between the model response and the test rig response is below a defined threshold.

15. A machine readable medium encoded with instructions for causing a processor to control simulation of a coupled hybrid dynamic system, the instruction comprising code for:

driving a physical structural component of the system on a test rig by applying a drive signal input to the test rig to generate a test rig response as a result, and

receiving the test rig response at the processor configured with a virtual model of the system and generating a model response of the system based on using a first part of the received test rig response as an input;

comparing a different, second part of the test rig response with the corresponding model response to form a difference; and

using the difference to form a system dynamic response model for generating the test rig drive signal

16. The machine-readable medium of claim 15, wherein the code further provides for causing the processor to control applying a virtual drive, generating the test rig drive signal, receiving the test rig response, generating a model response, comparing the test rig response with the model response to generate a simulation process error, and reducing the error using an inverse of the system dynamic response model, iteratively until a difference between the model response and the test rig response is below a defined threshold.