Lightning conditioning of aircraft

Patent metadata

Field	Value
Publication number	US-11260987-B2
Application number	US-202016885626-A
Country	US
Kind code	B2
Filing date	May 28, 2020
Priority date	May 28, 2020
Publication date	Mar 1, 2022
Grant date	Mar 1, 2022

Abstract

A method for conditioning to reduce lightning strike effects is provided herein. The method includes positioning a plurality of tabs on a component. The plurality of tabs are electrically conductive. The component includes at least one of a composite material and a metal material having at least one joint. The method includes positioning the component on a support that is electrically insulated, and connecting a plurality of wires between an initial set of the plurality of tabs and a pulse generator. The pulse generator is configured to generate a plurality of current pulses through the plurality of wires. The plurality of current pulses imitate a plurality of lightning strikes. The method further includes striking the component with the plurality of current pulses from the pulse generator, and reconnecting the plurality of wires to one or more different sets of the plurality of tabs between the plurality of current pulses.

First claim

What is claimed is:

1. A method for conditioning to reduce lightning strike effects, the method comprising:
positioning a plurality of tabs on a component, wherein the plurality of tabs are electrically conductive, the component includes at least one of a composite material and a metal material, and the metal material includes at least one joint;
positioning the component on a support that is electrically insulated;
connecting a plurality of wires between an initial set of the plurality of tabs and a pulse generator, wherein the pulse generator is configured to generate a plurality of current pulses through the plurality of wires, and the plurality of current pulses imitate a plurality of lightning strikes;
striking the component with the plurality of current pulses from the pulse generator; and
reconnecting the plurality of wires to one or more different sets of the plurality of tabs between the plurality of current pulses.

2. The method according to claim 1 , wherein the component is an aircraft.

3. The method according to claim 1 , wherein the component is part of an aircraft.

4. The method according to claim 1 , further comprising:
enclosing the component inside a chamber during the striking, wherein the chamber is configured to contain leakage currents from the plurality of current pulses.

5. The method according to claim 1 , wherein the composite material has a plurality of ply layers, and at least two of the plurality of tabs are positioned on the component perpendicular to the plurality of ply layers and on opposite sides of the plurality of ply layers.

6. The method according to claim 1 , wherein the component includes the at least one joint, and the plurality of current pulses exceed a minimum current that causes sparking at the at least one joint.

7. The method according to claim 1 , wherein at least one of the plurality of current pulses is in a range of approximately 180,000 amperes to approximately 220,000 amperes.

8. The method according to claim 1 , wherein each of the plurality of current pulses has a double-exponential waveform.

9. The method according to claim 1 , wherein each of the plurality of current pulses has a component-A waveform in accordance with MIL-STD-1757A or a square wave waveform.

10. The method according to claim 1 , further comprising:
charging a first capacitor bank while a second capacitor bank provides electrical power to the pulse generator; and
switching the second capacitor bank with the first capacitor bank in response to the second capacitor bank becoming discharged.

11. A conditioning system comprising:
a support that is electrically insulated and configured to hold a component, wherein the component includes at least one of a composite material and a metal material, and the metal material includes at least one joint;
a pulse generator configured to generate a plurality of current pulses, wherein the plurality of current pulses imitate a plurality of lightning strikes;
a plurality of tabs that are electrically conductive and positioned on the component; and
a plurality of wires connected to the pulse generator and removably connectable to an initial set of the plurality of tabs, wherein the conditioning system is configured to strike the component with the plurality of current pulses from the pulse generator, and the plurality of wires are moveable to one or more different sets of the plurality of tabs between the plurality of current pulses.

12. The conditioning system according to claim 11 , wherein the component is an aircraft.

13. The conditioning system according to claim 11 , wherein the component is a part of an aircraft.

14. The conditioning system according to claim 11 , further comprising a chamber configured to enclose the component during the strikes, wherein the chamber is configured to contain leakage currents from the plurality of current pulses.

15. The conditioning system according to claim 11 , wherein the composite material has a plurality of ply layers, and at least two of the plurality of tabs are positioned on the component perpendicular to the plurality of ply layers and on opposite sides of the plurality of ply layers.

16. The conditioning system according to claim 11 , wherein the component includes the at least one joint, and the plurality of current pulses exceed a minimum current that causes sparking at the at least one joint.

17. The conditioning system according to claim 11 , wherein at least one of the plurality of current pulses is in a range of approximately 180,000 amperes to approximately 220,000 amperes.

18. The conditioning system according to claim 11 , wherein each of the plurality of current pulses has a double-exponential waveform.

19. The conditioning system according to claim 11 , wherein each of the plurality of current pulses has a component-A waveform in accordance with MIL-STD-1757A or a square wave waveform.

20. A component of an aircraft conditioned by the method of claim 1 .

Assignees

• Boeing Co

Inventors

• Anway Carol E

Classifications

• H02G13/60

  Detecting; Measuring; Sensing; Testing; Simulating · CPC title

• B64D45/02 Primary

  Lightning protectors; Static dischargers · CPC title

• B64C1/12

  Construction or attachment of skin panels · CPC title

• B64C1/36

  adapted to receive antennas or radomes · CPC title

• H02G13/80

  Discharge by conduction or dissipation, e.g. rods, arresters, spark gaps · CPC title