IP Library › Granted Patent US 11,014,662
Granted Patent B2
US 11,014,662 · App. 16/060,374 · Granted May 25, 2021

Method and system for generating a set of values for respective ones of a set of parameters used in determining rotor blade profiles for a coaxial rotor system

Inventor: Keen Ian Chan (Singapore, SG)
Assignee: ST ENGINEERING AEROSPACE LTD.
B64C27/473B64C27/10B64C27/467
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Quick Facts
Patent No.
US 11,014,662
App. No.
16/060,374
Granted
May 25, 2021
Kind
B2
Abstract

A method and system for generating a set of values for respective ones of a set of parameters used in determining rotor blade profiles for a coaxial rotor system. The method includes establishing ( 302 ) a ratio of respective desired thrusts of an upper rotor ( 102, 602 ) and a lower rotor ( 104, 604 ) of the coaxial rotor system based on a desired performance of the coaxial rotor system, and determining ( 304 ) the set of values of the set of parameters from the desired thrusts ratio based on a torque balance condition between the upper rotor and the lower rotor of the coaxial rotor system.

Claims (24)

1. A method of generating a set of values for respective ones of a set of parameters used in determining rotor blade profiles for a coaxial rotor system, the method comprising:

establishing a ratio of respective desired thrusts of an upper rotor and a lower rotor of the coaxial rotor system based on a desired performance of the coaxial rotor system; and

determining the set of values of the set of parameters from the desired thrusts ratio based on a torque balance condition between the upper rotor and the lower rotor of the coaxial rotor system.

2. The method of claim 1 , further comprising establishing a maximum rotor diameter for the coaxial rotor system prior to determining the set of values for the set of parameters, and wherein determining the set of values for the set of parameters comprises using the maximum rotor diameter.

3. The method of claim 1 , further comprising establishing a desired total thrust for the coaxial rotor system prior to determining the set of values for the set of parameters, and wherein determining the set of values for the set of parameters comprises using the desired total thrust.

4. The method of claim 1 , wherein determining the set of values for the set of parameters further comprises optimizing the set of values based on a maximum hovering efficiency.

5. The method of claim 1 , wherein the set of parameters include a ratio of respective rotor disc areas of the upper rotor and the lower rotor of the coaxial rotor system.

6. The method of claim 5 , wherein the set of parameters include upper rotor diameter and lower rotor diameter.

7. The method of claim 1 , wherein the set of parameters include a ratio of respective rotor tip speeds of the upper rotor and the lower rotor of the coaxial rotor system.

8. The method of claim 7 , wherein the set of parameters include shaft rotational speeds of the upper rotor and the lower rotor.

9. The method of claim 1 , wherein the set of parameters include a disc loading of the upper rotor.

10. The method of claim 1 , wherein the set of parameters include an ideal total induced power of the coaxial rotor system.

11. The method of claim 1 , wherein the ratio of respective desired thrusts of the upper rotor and the lower rotor of the coaxial rotor system is 1:1.

12. A system for generating a set of values for respective ones of a set of parameters used in determining rotor blade profiles for a coaxial rotor system, the system comprising:

means for establishing a ratio of respective desired thrusts of an upper rotor and a lower rotor of the coaxial rotor system based on a desired performance of the coaxial rotor system; and

means for determining the set of values of the set of parameters from the desired thrusts ratio based on a torque balance condition between the upper rotor and the lower rotor of the coaxial rotor system.

13. The system of claim 12 , further comprising means for establishing a maximum rotor diameter for the coaxial rotor system, and wherein the means for determining the set of values for the set of parameters uses the maximum rotor diameter to determine the set of values for the set of parameters.

14. The system of claim 12 , further comprising means for establishing a desired total thrust for the coaxial rotor system, and wherein the means for determining the set of values for the set of parameters uses the desired total thrust to determine the set of values for the set of parameters.

15. The system of claim 12 , wherein the means for determining the set of values for the set of parameters optimizes the set of values based on a maximum hovering efficiency.

16. The system of claim 12 , wherein the set of parameters include a ratio of respective rotor disc areas of the upper rotor and the lower rotor of the coaxial rotor system, and wherein the set of parameters include upper rotor diameter and lower rotor diameter.

17. The system of claim 12 , wherein the set of parameters include a ratio of respective rotor tip speeds of the upper rotor and the lower rotor of the coaxial rotor system, and wherein the set of parameters include shaft rotational speeds of the upper rotor and the lower rotor.

18. The system of claim 12 , wherein the set of parameters include a disc loading of the upper rotor.

19. The system of claim 12 , wherein the set of parameters include an ideal total induced power of the coaxial rotor system.

20. The system of claim 12 , wherein the ratio of respective desired thrusts of the upper rotor and the lower rotor of the coaxial rotor system is 1:1.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Sep 14, 2018
From: CHAN, KEEN IAN
To: ST ENGINEERING AEROSPACE LTD.
Reel/Frame 046875/0608 →
Continuity (1)
Related Publication 20190002096A1 · Jan 3, 2019