STRAIN MEASUREMENT ASSEMBLY

• US 20190107380A1
• Filed: 10/11/2017
• Published: 04/11/2019
• Est. Priority Date: 10/11/2017
• Status: Abandoned Application

• Current Assignee: Sikorsky Aircraft Corporation (Martin Marietta Corporation)
• Original Assignee: Sikorsky Aircraft Corporation (Martin Marietta Corporation)
• Inventors: Cerge, Brandon M.
• Application Number:
  US15/729,775
• Publication Number:
  US 20190107380A1
• Time in Patent Office: Days
• CPC Class Codes: B64D 2045/0085 Devices for aircraft health monitoring, e.g. monitoring flutter or vibration
• CPC Class Codes: B64D 45/00 Aircraft indicators or protectors not otherwise provided for camouflage F41H3/00
• CPC Class Codes: G01B 7/18 using change in resistance
• CPC Class Codes: G01B 7/20 formed by printed-circuit technique
• CPC Class Codes: G07C 5/008 communicating information to a remotely located station transmission systems for measured values G08C
• CPC Class Codes: G07C 5/085 using electronic data carriers

Abstract

A strain measuring assembly for measuring a strain of an element of interest includes a strain gage and a first set of wire connectors disposed on a carrier that is within 12 inches of the strain gage, the first set of wire connectors being configured to connect with lead wires from the strain gage. The assembly also includes resistance measuring circuitry disposed on the carrier and connected to the first set of wire connectors, the resistance measuring circuitry being configured to measure a resistance of the strain gage and to output a signal derived from the measured resistance. The assembly further includes a second set of wire connectors disposed on the carrier and connected to the resistance measuring circuitry, the second set of wire connectors being configured to connect with wires from an external device to output the signal to the external device.

Claims

1. A strain measuring assembly for measuring a strain of an element of interest, the strain measuring assembly comprising:

a strain gage;

a first set of wire connectors disposed on a carrier, the first set of wire connectors being within 12 inches of the strain gauge and configured to connect with lead wires from the strain gage;

resistance measuring circuitry disposed on the carrier and connected to the first set of wire connectors, the resistance measuring circuitry being configured to measure a resistance of the strain gage and to output a signal derived from the measured resistance; and

a second set of wire connectors disposed on the carrier and connected to the resistance measuring circuitry, the second set of wire connectors being configured to connect with wires from an external device to output the signal to the external device.

2. The strain measuring assembly according to claim 1, wherein the second set of wire connectors is further configured to provide an input voltage to the resistance measuring circuitry.

3. The strain measuring assembly according to claim 1, wherein the carrier is within four inches of the strain gauge.

4. The strain measuring assembly according to claim 1, wherein the first set of wire connectors and/or the second set of wire connectors comprise soldering pads.

5. The strain measuring assembly according to claim 1, wherein the carrier is a fiberglass printed circuit board.

6. The strain measuring assembly according to claim 1, wherein the resistance measuring circuitry comprises a Wheatstone bridge with the resistance of the strain gage being in one leg of the Wheatstone bridge via the first set of wire connectors.

7. The strain measuring assembly according to claim 1, wherein the external device is a strain gage data recorder.

8. The strain measuring assembly according to claim 1, wherein the lead wires from the strain gage comprise wire having a gauge in a range of 28-32.

9. The strain measuring assembly according to claim 1, wherein the wires from an external device comprise wire having a gauge in a range of 22-24.

10. The strain measuring assembly according to claim 1, wherein the element of interest is part of an aircraft.

11. A method for measuring a strain of an element of interest, the method comprising:

applying a strain gage to an element of interest;

connecting lead wires from the strain gage to a first set of wire connectors disposed on a carrier, the first set of wire connectors being within 12 inches of the strain gage;

connecting wires from an external device to a second set of wire connectors disposed on the carrier; and

measuring a resistance of the strain gage and outputting a signal derived from the measured resistance to the external device using resistance measuring circuitry disposed on the carrier, wherein the resistance measuring circuitry is electrically connected to the first set of wire connectors and the second set of wire connectors.

12. The method according to claim 11, further comprising inputting an input voltage to the resistance measuring circuitry via the second set of wire connectors.

13. The method according to claim 11, wherein the external device is a strain gage data recorder and the method further comprising recording strain measurements.

14. The method according to claim 11, wherein the element of interest is an aircraft.

15. The method according to claim 11, further comprising compensating for temperature using another lead wire in parallel with one of the lead wires from the strain gage.

16. The method according to claim 11, wherein the carrier is within four inches of the strain gauge.

17. The method according to claim 11, wherein the element of interest is part of an aircraft.