Virtual ice accretion meter display

• US 8,779,945 B2
• Filed: 03/15/2011
• Issued: 07/15/2014
• Est. Priority Date: 03/17/2010
• Status: Active Grant

• Current Assignee: Sikorsky Aircraft Corporation (Martin Marietta Corporation)
• Original Assignee: Sikorsky Aircraft Corporation (Martin Marietta Corporation)
• Inventors: Flemming, Robert James
• Primary Examiner(s): Ghayour, Mohammad
• Assistant Examiner(s): Aziz, Adnan
• Application Number:
  US13/047,970
• Publication Number:
  US 20110226904A1
• Time in Patent Office: 1,218 Days
• Field of Search: 340/962, 340/945, 340/580, 340/963, 340/969, 244/134.F, 702/3
• US Class Current: 340/962
• CPC Class Codes: B64D 15/20 Means for detecting icing or initiating de-icing
• CPC Class Codes: G01C 23/005 Flight directors indicating arrangements specially adapted for rotary gyroscopes G01C19/32

Abstract

A flight display for an aircraft includes a virtual ice accretion meter having a liquid water content portion and an ice thickness portion. A method for determining ice accretion includes integrating over a time period a constant K multiplied by a liquid water content (LWC) and true airspeed (TAS).

Claims

1. A flight display for an aircraft, comprising:

a virtual ice accretion meter display having a liquid water content portion and an ice thickness portion, wherein the ice thickness portion is configured to display an ice thickness value, determined by integrating over a time period a constant K multiplied by a liquid water content (LWC) multiplied by true airspeed (TAS).

2. The flight display as recited in claim 1, further comprising a liquid water content (LWC) meter display adjacent to said virtual ice accretion meter display.

3. The flight display as recited in claim 1, further comprising an engine torque display adjacent to said virtual ice accretion meter display.

4. The flight display as recited in claim 1, wherein said ice thickness portion includes a numeric value which represents ice thickness.

5. The flight display as recited in claim 4, wherein said numeric value is color coded with respect to the ice thickness.

6. The flight display as recited in claim 1, wherein the ice thickness is greater than zero.

7. A method for determining ice accretion on an aircraft component comprising:

integrating, within an aircraft avionics system, over a time period a constant K multiplied by a liquid water content (LWC) multiplied by true airspeed (TAS) to virtually determine an ice accretion thickness value; and

displaying, within the aircraft avionics system, the ice accretion thickness value.

8. A method as recited in claim 7, further comprising:

displaying the ice accretion thickness value as a numeric value which represents an ice thickness on the aircraft component.

9. A method as recited in claim 8, further comprising:

color coding the numeric value with respect to the ice thickness.

10. A method as recited in claim 7, further comprising:

determining the constant K for a particular aircraft component.

11. A method as recited in claim 10 wherein the aircraft component is a rotor blade.

12. A method as recited in claim 10 wherein the aircraft component is an engine inlet.

13. A method as recited in claim 7, further comprising:

resetting the time period.

14. A method as recited in claim 7, wherein the TAS varies over time.

15. A method as recited in claim 7, wherein the LWC varies over time.

16. A method as recited in claim 7, wherein the ice thickness is greater than zero.

17. A method as recited in claim 7, further comprising:

executing the integrating using a processor within the aircraft avionics system; and

displaying the ice accretion thickness value on a primary flight display as part of a virtual ice accretion meter display.

18. A method as recited in claim 7, further comprising:

initiating the integrating in response to data from a sensor system indicating that an aircraft has entered an icing cloud or other icing conditions that may form an icing environment.

19. A flight display for an aircraft, comprising:

a virtual ice accretion meter display having a liquid water content portion and an ice thickness portion, wherein the ice thickness portion is configured to display an ice thickness value for an area of the aircraft, determined by integrating over a time period a constant K multiplied by a liquid water content (LWC) multiplied by true airspeed (TAS).