SYSTEM AND METHOD OF IDENTIFYING THE ORIENTATION OF A TRI-AXIAL ACCELEROMETER

• US 20100126274A1
• Filed: 11/26/2008
• Published: 05/27/2010
• Est. Priority Date: 11/26/2008
• Status: Active Grant

• Current Assignee: Fluke Corporation (Fortive Corp.)
• Original Assignee: Fluke Corporation (Fortive Corp.)
• Inventors: Lin, Sidney
• Granted Patent: US 8,266,959 B2
• Time in Patent Office: Days
• US Class Current: 73/514.290
• CPC Class Codes: G01P 15/18 in two or more dimensions
• CPC Class Codes: G01P 21/00 Testing or calibrating of apparatus or devices covered by the preceding groups

Abstract

A system and method for analyzing a device that includes a mass configured for motion. The system includes a tri-axial accelerometer disposed to detect acceleration vectors of the device and to output three channels of acceleration data, and a user interface receiving the three channels of acceleration data. The user interface is configured to correlate the three channels of acceleration data with a reference frame defined by three orthogonal axes intersecting at a vertex, and includes a display and a selector. The display shows sets of options that represent dispositions of the device with respect to gravity, placements of the tri-axial accelerometer with respect to the device, and orientations of the tri-axial accelerometer with respect to the device. The selector selects one device disposition option, one tri-axial accelerometer placement option, and one tri-axial accelerometer orientation option.

Claims

1. A system for identifying an orientation of a tri-axial accelerometer with respect to a device, the device including a mass rotating on a shaft, the system comprising:

first indicia configured to map orthogonal axes of the tri-axial accelerometer with directional axes of the device;

second indicia configured to represent placements of the tri-axial accelerometer on the device; and

pairings of a first indicium (one of the first indicia) and a second indicium (one of the second indicia) are disposed at a plurality of locations on the tri-axial accelerometer.

2. The system of claim 1, wherein the directional axes of the device comprise axial, radial and tangential axes of the device.

3. The system of claim 2, wherein the first indicia comprises three identifiers, a first one of the three identifiers is associated with the axial axis of the device, a second one of the three identifiers is associated with the radial axis of the device, and a third one of the three identifiers is associated with the tangential axis of the device.

4. The system of claim 3, wherein the first indicia comprises sequences of the three identifiers, each sequence comprises an ordered triplet of the three identifiers, and each of the first, second and third identifiers occurs once in each ordered triplet.

5. The system of claim 1, wherein the placements comprise tri-axial accelerometer placement on an axial end surface of the device and tri-axial accelerometer placement on an axial flank surface of the device.

6. The system of claim 5, wherein the second indicia comprises two schematics, a first one of the two schematics represents the tri-axial accelerometer placement on the axial end surface of the device, and a second one of the two schematics represents the tri-axial accelerometer placement on the axial flank surface of the device.

7. A system for identifying axial, radial and tangential axes of a device, the device including a shaft and a mass rotating on the shaft, the system comprising:

a tri-axial accelerometer detecting acceleration vectors along the axial, radial and tangential axes, the tri-axial accelerometer including

first, second and third orthogonal axes;

a first face configured to be coupled to the device;

a second face spaced along the first orthogonal axis from the first face; and

a lateral surface coupling peripheral edges of the first and second faces;

first indicia configured to map the first, second and third orthogonal axes with the axial, radial and tangential axes of the device, the first indicia includes sequences of a first identifier associated with the axial axis, a second identifier associated with the radial axis, and a third identifier associated with the tangential axis, wherein each of the sequences is an ordered triplet that includes one of each of the first, second and third identifiers;

second indicia configured to represent placements of the tri-axial accelerometer on the device, the second indicia includes a first schematic that represents a placement of the tri-axial accelerometer on an axial end surface of the device and a second schematic that represents a placement of the tri-axial accelerometer on an axial flank surface of the device;

a first pairing of one of the first indicia and the first schematic is disposed at a first location on a first one of the second face and the lateral surface;

a second pairing of one of the first indicia and the second schematic is disposed at a second location on the first one of the second face and the lateral surface;

a third pairing of one of the first indicia and one of the second indicia is disposed at a third location on the first one of the second face and the lateral surface; and

a fourth pairing of one of the first indicia and one of the second indicia is disposed at a fourth location on a second one of the second face and the lateral surface lateral surface;

wherein a line of sight generally coincides with one of the first, second and third orthogonal axes, and one of the first indiciums of the first and second pairings identifies the axial, radial and tangential axes of the device based on (1) the first indiciums of the first and second pairings have an upright attitude as viewed along the line of sight, (2) the first indicium of the third pairing is not visible along the light of sight or has one of a sideways or inverted attitude as viewed along the line of sight, (3) the first indicium of the fourth pairing is not visible along the line of sight, and (4) one of the first and second schematics matches the placement of the tri-axial accelerometer on the device.

8. The system of claim 7, wherein the first and second faces are generally round, and the lateral surface includes a cylinder.

9. The system of claim 7, wherein the tri-axial accelerometer includes a first coupling portion configured to mate with a second coupling portion and to output acceleration data, and the first coupling portion matingly engages the second coupling portion along one of the second and third orthogonal axes.

10. The system of claim 7, wherein a first set of eight pairings, including the first, second and third pairings, are disposed at locations on the first one of the second face and the lateral surface, and a second set of eight pairings, including the fourth pairing, are disposed at locations on the second one of the second face and the lateral surface.

11. The system of claim 7, the first and second indicia are disposed on a substrate.

12. The system of claim 11, wherein the first and second indicia are printed on the substrate, and the substrate is adhered to tri-axial accelerometer.

13. A method of detecting acceleration vectors along the axial, radial and tangential axes of a device, the device including a shaft and a mass rotating on the shaft, the method comprising:

placing a tri-axial accelerometer on the device;

labeling at locations on the tri-axial accelerometer pairs including one of a first indicia and one of a second indicia, the first indicia mapping orthogonal axes of a tri-axial accelerometer with the axial, radial and tangential axes of the device, and the second indicia represents placements of the tri-axial accelerometer on the device; and

identifying the axial, radial and tangential axes of the device, the identifying being based on

viewing along a line-of-sight the tri-axial accelerometer; and

observing one of the pairs including a first indicium having an upright attitude and a second indicium matching placement of the tri-axial accelerometer on the device.

14. The method of claim 13, wherein the first indicia mapping comprises ordering sequences of a first identifier associated with the axial axis, a second identifier associated with the radial axis, and a third identifier associated with the tangential axis, and each of the sequences includes one of each of the first, second and third identifiers.

15. The method of claim 14, wherein the mapping comprises six different ordered sequences.

16. The method of claim 13, wherein the placing comprises one of placing the tri-axial accelerometer on a device axial end surface and placing the tri-axial accelerometer on a device axial flank surface, and the second indicia comprises first and second schematics, the first schematic represents the tri-axial accelerometer placed on the device axial end surface and the second schematic represents the tri-axial accelerometer placed on the device axial flank surface.

17. The method of claim 13, wherein the labeling comprises printing the first and second indicia on a substrate and adhering the substrate to the tri-axial accelerometer.