METHOD AND DEVICE FOR MONITORING THE MALFUNCTION OF APU TURBINE VANE FRACTURE AND ROTOR SHAFT JAM

• US 20150068293A1
• Filed: 07/23/2014
• Published: 03/12/2015
• Est. Priority Date: 07/24/2013
• Status: Active Grant

• Current Assignee: Air China Limited
• Original Assignee: Air China Limited
• Inventors: Chen, Lei, Huang, Lei, Ding, Huifeng, Gu, Zhuping, Yue, Qihe, Wu, Jiaju, Zhang, Hailong, Zheng, Fengliang
• Granted Patent: US 9,632,010 B2
• Time in Patent Office: Days
• US Class Current: 73/112.01
• CPC Class Codes: B64F 5/60 Testing or inspecting aircraft components or systems
• CPC Class Codes: F01D 21/04 responsive to undesired position of rotor relative to stator or to breaking-off of a part of the rotor, e.g. indicating such position
• CPC Class Codes: F02C 7/26 Starting; Ignition
• CPC Class Codes: F05D 2220/50 for auxiliary power units (APU's)
• CPC Class Codes: F05D 2270/44 active, predictive, or anticipative
• CPC Class Codes: G01M 15/14 Testing gas-turbine engines or jet-propulsion engines
• CPC Class Codes: G01N 25/00 Investigating or analyzing materials by the use of thermal means G01N3/00 - G01N23/00 take precedence
• CPC Class Codes: G05B 23/0235 based on a comparison with predetermined threshold or range, e.g. "classical methods", carried out during normal operation; threshold adaptation or choice; when or how to compare with the threshold

Abstract

The present invention relates to a method and device for monitoring APU turbine vane fracture and rotor shaft jam. The method for monitoring APU turbine vane fracture and rotor shaft jam comprises: acquiring APU messages at multiple time points within a period; obtaining the operation parameters of the APU according to the APU messages, the operation parameters including at least the start time STA; calculating the average value AVG and the deviation index δ of the start time STA within the period; and determining the circumstance of the turbine vane fracture and rotation shaft jam of APU is in stable phase, decline phase or malfunction phase according to the deviation index δ.

Claims

1. A method for monitoring the malfunction of the APU turbine vane fracture and rotation shaft jam, comprising:

acquiring APU messages at multiple time points within a period;

obtaining the operation parameters of the APU according to the APU messages, the operation parameters including at least the start time STA;

calculating the average value AVG and the deviation index δ

of the start time STA within the period;

determining the circumstance of the APU turbine vane fracture and rotation shaft jam is in stable phase, decline phase or malfunction phase according to the deviation index δ

.

2. According to the method of claim 1, wherein the step of determining the circumstances of APU turbine vane fracture and rotor shaft jam is in stable phase, decline phase or malfunction phase comprises:

response to the deviation index δ

is less than the threshold value of decline phase, determining the circumstances of APU turbine vane fracture and rotor shaft jam is in stable phase;

response to the deviation index δ

is greater than the threshold value of decline phase and less than the threshold value of malfunction, determining the circumstances of APU turbine vane fracture and rotor shaft jam is in decline phase; and

response to the deviation index δ

is greater than the threshold value of malfunction, determining the circumstances of APU turbine vane fracture and rotor shaft jam is in malfunction phase.

3. According to the method of claim 2, further comprises:

determining the deviation index when the circumstances of APU turbine vane fracture and rotor shaft jam is in stable phase;

wherein the threshold value of decline is around 2 times than the deviation index, and the threshold value of malfunction is around 6 times than the stable deviation index.

4. According to the method of claim 2, wherein, the decline phase further comprises serious decline phase, and the threshold value of the serious decline is between the threshold values of decline and malfunction, response to the deviation index δ

is greater than the threshold value of the serious decline and less than the threshold value of malfunction, determining the circumstances of APU turbine vane fracture and rotor shaft jam is in serious decline phase, the threshold value of the serious decline is around 4 times than the stable deviation index δ

.

5. According to the method of claim 1, wherein the time period is about 5-10 days in case 2 or 3 points are measured per day.

6. According to the method of claim 1, wherein about 10-40 APU messages are obtained within the time period.

7. According to the method of claim 1, further comprises:

obtaining the start time STA on the next time point by updating the APU message at the next time point;

response to STAnext is greater than AVG+nδ

or less than AVG−

nδ

, determining whether the STA_next+1 obtained according to the further next message related to APU is greater than AVG+nδ

or less than AVG−

nδ

; and

response to the start time STA obtained according to the message related to APU is greater than AVG+nδ

or less than AVG−

nδ

continuously and exceeding the predetermined number Z, issuing the warning.

8. According to the method of claim 7, response to the start time STA obtained according to the message related to APU is between AVG+nδ

or less than average value AVG−

nδ

, recalculating the average value AVG and deviation index δ

of the start time STA.

9. According to the method of claim 7, response to the start time STA obtained according to the message related to APU is greater than AVG+nδ

or less than AVG−

nδ

continuously and exceeding the predetermined number Z, recalculating the average value AVG and deviation index δ

of the start time STA.

10. According to the method of claim 1, wherein the deviation index δ

is standard deviation.

11. According to the method of claims 7, wherein the range of the value of n is 2 or 3.

12. According to the method of claim 7, further comprises:

response to the start time STA obtained according to the message related to APU is greater than AVG+nδ

or less than AVG−

nδ

continuously and exceeding the predetermined number Z, issuing the warning.

13. According to the method of claim 7, wherein the range of the value of Z is 3-5.

14. According to the method of claim 1, the method further comprises:

response to whether the highest exhaust gas temperature on start EGTP reaches the redline temperature, issuing the warning of the malfunction of the turbine vane fracture and rotation shaft jam.

15. According to the method of claim 14, the method further comprises:

response to whether the NPA reaches or closes to the predetermined threshold value when EGT is at its peak on start, issuing the warning of the malfunction of APU turbine vane fracture and rotor shaft jam, wherein the predetermined threshold value is 35-40%.

16. According to the method of claim 15, wherein response to the increase of the standard of EGTP and NPA, issuing the warning of the malfunction of turbine vane fracture and rotation shaft jam.

17. According to the method of claim 15, the method further comprises:

response to that exhaust gas temperature EGT is close to the redline value or whether the angle of the inlet guide vane IGV appears an upward jump, issuing the warning of the malfunction of APU turbine vane fracture and rotation shaft jam.

18. According to the method of claim 1, wherein the method further comprises:

obtaining the history data of the start time STA; and

determining whether the start time STA exhibits gradual increase, gradual regular, and then discrete.

19. A device for monitoring the malfunction of the airborne auxiliary power unit APU turbine vane fracture and rotation shaft jam, comprises:

message acquiring unit, which acquires the APU messages within a time period;

message analyzing unit, which analyses the required APU operation data, the operation data at least comprises start time STA; and

malfunction monitoring unit, which determines the circumstances of APU turbine vane fracture and rotor shaft jam is in stable phase, decline phase or malfunction phase according to the APU operation data.

20. A device for monitoring the malfunction of the airborne auxiliary power unit APU turbine vane fracture and rotation shaft jam, comprises:

a processor; and

a memory coupled to the processor, which stores the computer-readable codes;

the computer-readable codes run in the processor to execute the following steps;

acquiring the APU messages at multiple time points within a time period;

obtaining the operation parameters of the APU according to the APU message, the operation parameters at least comprises start time STA;

calculating the average value AVG and deviation index δ

of the start time STA within the time period; and

determining that the circumstances of APU turbine vane fracture and rotor shaft jam is in stable phase, decline phase, serious decline phase or malfunction phase according to the deviation index δ

.