Systems and methods for actively monitoring health of a no back brake device

• US 10,234,012 B1
• Filed: 06/30/2015
• Issued: 03/19/2019
• Est. Priority Date: 06/30/2015
• Status: Active Grant

• Current Assignee: Safran Electronics & Defense Avionics USA LLC (Safran SA)
• Original Assignee: Rockwell Collins, Inc. (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: Latif, Rana Kamran
• Primary Examiner(s): Zhu, Sheng-Bai
• Application Number:
  US14/788,678
• Time in Patent Office: 1,358 Days
• Field of Search: 74 89, 73716
• CPC Class Codes: B64C 13/28 mechanical
• CPC Class Codes: B64C 13/50 using electrical energy
• CPC Class Codes: B64C 5/02 Tailplanes
• CPC Class Codes: B64C 5/16 about spanwise axes
• CPC Class Codes: F16H 2025/2075 Coaxial drive motors
• CPC Class Codes: F16H 2035/005 Gearings or mechanisms preventing back-driving braking or locking of screw actuators F16H25/2454
• CPC Class Codes: F16H 2057/016 Monitoring of overload conditions
• CPC Class Codes: F16H 25/2204 with balls
• CPC Class Codes: F16H 25/2454 Brakes; Rotational locks
• CPC Class Codes: F16H 57/01 Monitoring wear or stress of gearing elements, e.g. for triggering maintenance
• CPC Class Codes: G05B 15/02 electric
• CPC Class Codes: G05B 2219/31452 Send a warning message that an event has to be monitored before the event occurs

Abstract

An actuator system includes a motor, a ballscrew assembly coupled to the motor, a no back brake device coupled to the ballscrew assembly, and a sensor coupled to the ballscrew assembly. The sensor is configured to acquire load data regarding a load applied to the no back brake device. A control module is configured to determine an estimated coefficient of friction for the no back brake device based on the load data, and transmit an alert signal based on determining that the estimated coefficient of friction is outside a predetermined range. The control module is coupled with the sensor and includes a processor coupled with a non-transitory processor-readable medium storing processor executable code.

Claims

1. An actuator system, comprising:

a motor;

a ballscrew assembly coupled to the motor;

a no back brake device coupled to the ballscrew assembly;

a sensor coupled to the ballscrew assembly and configured to acquire load data indicative of a load applied to the ballscrew assembly; and

a control module coupled with the sensor, the control module including at least one processor coupled with a non-transitory processor-readable medium storing processor executable code for causing the at least one processor to;

determine an estimated coefficient of friction for the no back brake device based on the load data; and

transmit an alert signal based on determining that the estimated coefficient of friction is outside a predetermined range.

2. The system of claim 1, wherein the non-transitory processor-readable medium further stores processor executable code for causing the at least one processor to determine the estimated coefficient of friction based further on motor data regarding the motor.

3. The system of claim 2, wherein the motor includes an electric motor and the motor data includes an indication of a motor current.

4. The system of claim 2, wherein the motor includes a hydraulic motor and the motor data includes a pressure differential.

5. The system of claim 1, wherein the sensor includes a load pin operatively coupled to the ballscrew assembly.

6. The system of claim 1, wherein the predetermined range is defined by a minimum acceptable value for the estimated coefficient of friction for the no back brake device and wherein determining that the estimated coefficient of friction is outside the predetermined range includes determining that the estimated coefficient of friction is below the minimum acceptable value.

7. The system of claim 1, wherein the alert signal includes an indication of a potential failure of the no back brake device.

8. The system of claim 1, wherein the alert signal is configured to actuate a secondary brake.

9. A control system configured to monitor a condition of a no back brake device, comprising:

a control module including at least one processor coupled with a non-transitory processor-readable medium storing processor executable code for causing the at least one processor to;

receive load data from a sensor indicative of an external load applied to a ballscrew assembly coupled to a no back brake device;

receive motor data regarding a motor coupled to the ballscrew assembly;

determine a coefficient of friction for the no back brake device based on the load data and the motor data; and

transmit an alert signal based on determining that the coefficient of friction is outside a predetermined range.

10. The control system of claim 9, wherein the motor includes an electric motor and the motor data includes an indication of a motor current.

11. The control system of claim 9, wherein the motor includes a hydraulic motor and the motor data includes an indication of a pressure differential.

12. The control system of claim 9, wherein the sensor includes a load pin operatively coupled to the ballscrew assembly.

13. The control system of claim 9, wherein the predetermined range is defined by a minimum acceptable value for the coefficient of friction for the no back brake device.

14. The control system of claim 9, wherein the alert signal includes an indication of a potential failure of the no back brake device.

15. The control system of claim 9, wherein the alert signal is configured to actuate a secondary brake.

16. A method of monitoring a no back brake device for an actuator, comprising:

receiving load data from a sensor indicative of an external load applied to a ballscrew assembly coupled to a no back brake device;

receiving motor data regarding a motor coupled to the ballscrew assembly;

determining a coefficient of friction for the no back brake device based on the load data and the motor data; and

transmitting an alert signal based on determining that the coefficient of friction is outside of an acceptable range.

17. The method of claim 16, wherein the motor includes an electric motor and the motor data includes an indication of a motor current.

18. The method of claim 16, wherein the motor includes a hydraulic motor and the motor data includes an indication of a pressure differential.

19. The method of claim 16, wherein the sensor includes a load pin operatively coupled to the ballscrew assembly.

20. The method of claim 16, wherein the acceptable range is defined by a minimum acceptable value for the coefficient of friction for the no back brake device.