LEAK LOCALIZATION IN A CAVITATED BODY

• US 20090165535A1
• Filed: 11/06/2008
• Published: 07/02/2009
• Est. Priority Date: 11/06/2007
• Status: Abandoned Application

• Current Assignee: Purdue Research Foundation (Purdue University)
• Original Assignee: Purdue Research Foundation (Purdue University)
• Inventors: Deo, Mandar, Haroon, Muhammad, Adams, Douglas E.
• Application Number:
  US12/266,035
• Publication Number:
  US 20090165535A1
• Time in Patent Office: Days
• US Class Current: 73/49.700
• CPC Class Codes: G01M 3/025 Details with respect to the testing of engines or engine parts
• CPC Class Codes: G01M 3/3263 using a differential pressure detector G01M3/3245, G01M3/3272 take precedence

Abstract

The present invention includes a method and system using dynamic pressure measurements for determining a presence, location, and size of a leak in a chamber of a body. The method includes sealing a plurality of ports of the chamber, pressurizing the chamber with a fluid, measuring a dynamic pressure at each of the plurality of ports, and analyzing the dynamic pressure measured at each of the plurality of ports to determine a presence, location, and/or size of the leak. The location of the leak can be determined by analyzing magnitude and/or phase values from a generated frequency response function matrix, interpolating between two of the plurality of ports, triangulating between three of the plurality of ports, and/or analyzing a rate and profile at which the pressure decays at each of the plurality of ports to determine the location of the leak.

Claims

1. A method for determining a location of a leak, comprising:

providing an engine system or portion thereof including a chamber, the chamber having a boundary and a plurality of pressure measurement sites;

inducing a fluid pressure response in the chamber to test for a breach in the boundary of the chamber;

measuring a dynamic pressure at each of the plurality of pressure measurement sites; and

determining a location of a leak through the boundary of the chamber according to the dynamic pressure at each of the plurality of pressure measurement sites.

2. The method of claim 1, further comprising determining the leak is present in response to the leak having a size greater than a threshold.

3. The method of claim 1, further comprising determining a size of the leak.

4. The method of claim 3, wherein the size of the leak comprises a value determined by a volume leaked per unit of time at a specified pressure differential between the chamber and a surrounding environment.

5. The method of claim 1, wherein the engine system or portion thereof comprises an engine block.

6. The method of claim 1, further comprising producing a frequency response function matrix from the dynamic pressure at each of the plurality of pressure measurement sites, and determining the leak location by at least one analysis step selected from the group consisting of:

analyzing phase values from the frequency response function matrix;

analyzing magnitude values from the frequency response function matrix;

interpolating between two of the plurality of pressure measurement sites;

triangulating between three of the plurality of pressure measurement sites; and

analyzing a rate and profile at which the pressure decays at each of the plurality of pressure measurement sites to determine the location of the leak.

7. The method of claim 1, further comprising producing a frequency response function matrix from the dynamic pressure at each of the plurality of pressure measurement sites, and determining the presence of the leak by analyzing relative magnitude values from the frequency response function matrix.

12. The method of claim 1, further comprising producing a frequency response function matrix from the dynamic pressure at each of the plurality of ports, and determining the presence of the leak by analyzing relative magnitude values from the frequency response function matrix.

8. A method for detecting, locating, and quantifying a leak in a cavitated body that includes a plurality of ports, the method comprising:

sealing the plurality of ports in the cavitated body;

pressurizing the cavitated body;

measuring a dynamic pressure at the plurality of ports for a period of time; and

analyzing the measured dynamic pressure to determine a presence, location, and size of the leak.

9. The method of claim 8, further comprising the step of determining the presence of the leak by comparing the measured dynamic pressure to a threshold.

10. The method of claim 8, wherein the cavitated body comprises one of an engine block and an engine assembly.

11. The method of claim 8, further comprising producing a frequency response function matrix from the measured dynamic pressures, and determining the leak location by at least one analysis step selected from the group consisting of:

analyzing phase values from the frequency response function matrix;

analyzing magnitude values from the frequency response function matrix;

interpolating between two of the plurality of measured dynamic pressures;

triangulating between three of the plurality of measured dynamic pressures; and

analyzing a rate and profile at which the pressure decays at each of the measured dynamic pressures to determine the location of the leak.

13. A leak detection service method, comprising:

providing a leak detection apparatus comprising;

a fluid pressure response inducer;

a plurality of pressure sensors;

a controller;

connecting the leak detection apparatus to a device having a chamber such that the fluid pressure response inducer and the plurality of pressure sensors are in fluid communication with the chamber;

substantially sealing the chamber; and

inducing a fluid pressure response in the chamber;

wherein, the controller is structured to;

receive dynamic pressure data from the plurality of pressure sensors in response to the induced fluid pressure response; and

determine a leak location according to the dynamic pressure data.

14. The method of claim 13, wherein the controller is further structured to produce a frequency response function matrix from the dynamic pressure data, and to determine the leak location by at least one analysis step selected from the group consisting of:

analyzing phase values from the frequency response function matrix;

analyzing magnitude values from the frequency response function matrix;

interpolating between two of the plurality of sensors;

triangulating between three of the plurality of sensors; and

analyzing a rate and profile at which the pressure decays at each of the plurality of pressure sensors to determine the location of the leak.

15. The method of claim 14, further comprising providing output data structured to display the presence and location of the leak.

16. The method of claim 14, wherein the output data is further structured to display a size of the leak.

17. A system, comprising:

an engine related device having a substantially sealed chamber;

a plurality of pressure sensors in fluid communication with the substantially sealed chamber;

a fluid pressure response inducer in fluid communication with the substantially sealed chamber, the fluid pressure response inducer structured to induce a fluid pressure response in the substantially sealed chamber; and

a controller structured to;

receive dynamic pressure data from the plurality of pressure sensors in response to the induced fluid pressure response; and

determine a leak location according to the dynamic pressure data.

18. The system of claim 17, wherein the fluid response inducer comprises a pump.

19. The system of claim 17, wherein the engine related device comprises an engine block.

20. The system of claim 17, wherein the controller is further structured to produce a frequency response function matrix from the dynamic pressure measured by each of the plurality of pressure sensors, and to determine the leak location by at least one analysis step selected from the group consisting of:

analyzing phase values from the frequency response function matrix;

analyzing magnitude values from the frequency response function matrix;

interpolating between two of the plurality of sensors;

triangulating between three of the plurality of sensors; and

analyzing a rate and profile at which the pressure decays at each of the plurality of pressure sensors to determine the location of the leak.

21. A method for determining a presence of a leak in a chamber of a body, the chamber having a plurality of ports, comprising:

sealing the plurality of ports of the chamber;

connecting a plurality of sensors to the plurality of ports;

pressurizing the chamber with a fluid;

measuring a dynamic pressure at each of the plurality of ports for a period of time;

analyzing the dynamic pressure at each of the plurality of ports; and

determining a presence of a leak.

22. The method of claim 21, further comprising producing a frequency response function matrix from the dynamic pressure measured at each of the plurality of ports.

23. The method of claim 22, further comprising locating the leak by at least one analysis step selected from the group consisting of:

analyzing phase values from the frequency response function matrix;

analyzing magnitude values from the frequency response function matrix;

interpolating between two of the plurality of sensors;

triangulating between three of the plurality of sensors; and

analyzing a rate and profile at which the pressure decays at each of the plurality of pressure sensors to determine the location of the leak.

24. The method of claim 21, wherein the body comprises an engine block.

25. The method of claim 21, wherein the determining step comprises determining a size of the leak.

26. The method of claim 25, wherein the leak is present when the size of the leak is greater than a threshold value.

27. The method of claim 25, further comprising determining the chamber is leak-free when the size of the leak is less than a threshold value.