CN114427970B - Bearing monitoring method for aeroengine main bearing test - Google Patents
Bearing monitoring method for aeroengine main bearing test Download PDFInfo
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- CN114427970B CN114427970B CN202111436573.5A CN202111436573A CN114427970B CN 114427970 B CN114427970 B CN 114427970B CN 202111436573 A CN202111436573 A CN 202111436573A CN 114427970 B CN114427970 B CN 114427970B
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- bearing
- fulcrum bearing
- test
- temperature
- lubricating oil
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- 238000012360 testing method Methods 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000012544 monitoring process Methods 0.000 title claims abstract description 22
- 239000010687 lubricating oil Substances 0.000 claims abstract description 21
- 239000002184 metal Substances 0.000 claims abstract description 17
- 239000000428 dust Substances 0.000 claims abstract description 13
- 239000003921 oil Substances 0.000 claims abstract description 5
- 230000001050 lubricating effect Effects 0.000 claims abstract description 4
- 239000002699 waste material Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/04—Bearings
Abstract
The application provides a bearing monitoring method for an aeroengine main bearing test, which comprises the following steps: obtaining the temperature of the fulcrum bearing through a temperature sensor arranged on the outer ring of the fulcrum bearing; a lubricating oil dust sensor is arranged on an oil supply circuit of the fulcrum bearing, and metal dust in lubricating oil for lubricating the fulcrum bearing is obtained through the lubricating oil dust sensor; and obtaining output power of test equipment for operation of the aeroengine; when the metal scraps detected by the lubricating oil scraps sensor exceed a scraps threshold and the output power of test equipment in the same state of the aeroengine exceeds a power threshold, judging whether the temperature of the fulcrum bearing exceeds the temperature threshold, if so, judging that the fulcrum bearing fails, and if not, judging that the fulcrum bearing does not fail. The method can effectively improve the monitoring capability of the fulcrum bearing, discover the initial fault of the fulcrum bearing in advance, and avoid damage to the fulcrum bearing.
Description
Technical Field
The application belongs to the technical field of aeroengine tests, and particularly relates to a bearing monitoring method for an aeroengine main bearing test.
Background
Compared with the common bearing, the main bearing of the aeroengine has the characteristics of high rotating speed, small batch scale, high precision, high cost, high reliability requirement and the like, so that the working condition of the bearing on the engine needs to be simulated on test equipment for test verification, and the problems in design and production are found in advance. The main bearing of the aeroengine usually performs a bearing life-determining test according to GJB 7268-2011. As the service life of the main bearing of the aeroengine is required to be longer and longer, the number of test verification times required to be carried out is increased, once the test bearing is damaged due to the failure of the test equipment in the test process, the test is required to be carried out again, and the development period, the development cost and the like of the test are faced with great difficulty, so that the working reliability of the test equipment must be improved.
Currently, aero-engine main bearing tests generally only monitor the temperature of the fulcrum bearing, and accidents that the fulcrum bearing is damaged, such as test interruption and even test bearing damage, often occur. In order to prevent false alarm of the temperature of the fulcrum bearing, the set alarm temperature is relatively high, and the highest allowable working temperature of the fulcrum bearing is generally selected as an alarm value. The temperature of the fulcrum bearing depends on the oil supply temperature and self-heating condition, the working condition of the fulcrum bearing cannot be completely and truly reflected by the temperature of the fulcrum bearing, when the oil supply temperature of the fulcrum bearing is low, the condition that the fulcrum bearing is seriously damaged but still does not reach the alarm temperature exists, when the system alarms and the engine is stopped, the test equipment is seriously damaged, even the tested bearing is damaged, and the number of completed test hours is wasted. Repair test equipment even restarts the test, which causes waste of resources, repetition of work and stagnation of work progress.
Disclosure of Invention
The purpose of the application is to provide a fulcrum bearing monitoring method for an aeroengine main bearing test, so as to solve or alleviate at least one problem in the background art.
The technical scheme of the application is as follows: a method of fulcrum bearing monitoring for an aeroengine main bearing test, the method comprising:
obtaining the temperature of the fulcrum bearing through a temperature sensor arranged on the outer ring of the fulcrum bearing;
a lubricating oil dust sensor is arranged on an oil supply circuit of the fulcrum bearing, and metal dust in lubricating oil for lubricating the fulcrum bearing is obtained through the lubricating oil dust sensor; and
obtaining output power of test equipment for operation of the aero-engine;
when the metal scraps detected by the lubricating oil scraps sensor exceed a scraps threshold and the output power of test equipment in the same state of the aeroengine exceeds a power threshold, judging whether the temperature of the fulcrum bearing exceeds the temperature threshold, if so, judging that the fulcrum bearing fails, and if not, judging that the fulcrum bearing does not fail.
Further, the temperature threshold is obtained according to a preset value of the increase of the highest temperature of the fulcrum bearing in a high state of the stable aeroengine after the aeroengine operates for a plurality of cycles.
Further, the predetermined value of the increase is 10 ℃.
Further, when the metal chip is detected by the lubricating chip sensor, the increase rate of the number and the size of the metal chip is obtained.
Further, the end-of-chip threshold of the end-of-metal growth rate is 20 mg/hour.
Further, the output power of the test device is characterized by an output current.
Further, the output current threshold value representing the output power is 110% of the output current of the same state of the aero-engine.
Compared with the prior art, the fulcrum bearing monitoring method can effectively improve the monitoring capability of the fulcrum bearing, discover the initial fault of the fulcrum bearing in advance, and replace the fulcrum bearing in time when the fulcrum bearing is not lost, so that accidents of test interruption and even test bearing damage caused by the damage of the fulcrum bearing are avoided, the smooth performance of a main bearing test is ensured, the waste of resources and the repetition of work are reduced, and the progress and quality of test work are ensured.
Detailed Description
In order to make the purposes, technical solutions and advantages of the implementation of the present application more clear, the technical solutions in the embodiments of the present application will be described in more detail below in conjunction with the embodiments of the present application.
Aiming at the problems of monitoring the fulcrum bearing in the main bearing test of the aeroengine, the application provides a method for increasing the monitoring of the fulcrum bearing.
The fulcrum bearing monitoring method provided by the application comprises the following processes or steps:
1) On the basis of monitoring by adopting a temperature sensor of the outer ring of the fulcrum bearing, after the fulcrum bearing operates a plurality of load cycles and the test equipment reaches a stage of stable operation, acquiring and recording the highest temperature value of the fulcrum bearing in a large state (or a high state is referred to as the maximum state of the engine rotating speed and the load), and setting the highest temperature value as an overtemperature alarm limit value after increasing a plurality of temperatures so as to prevent failure in timely discovery caused by overtemperature alarm temperature. The temperature of the maximum temperature value is increased by 10 ℃ based on the maximum temperature value in the embodiment, which can be determined according to practical conditions.
2) And a lubricating oil dust sensor is added on a lubricating oil supply loop of the fulcrum bearing to monitor the quantity and the size of the metal dust falling from the bearing cavity.
The lubricating oil dust sensor can measure, count and accumulate the quantity and the size of the metal dust in the lubricating oil loop. In the beginning of the test, since some metal chips generated in the assembly process in the system interfere with the statistical result of the lubricating oil chip sensor, when the lubricating oil chip sensor is used in the preferred embodiment mode of the application, the quantity and the size of the metal chips are only used as references, and the increase rate of the quantity and the size of the metal chips is monitored to be used as a judgment basis.
3) The output power of the test equipment is monitored.
The output power of the tester or the testing equipment can be monitored by the magnitude of the current, and after a certain period of testing, the output current of the tester or the testing equipment in the large state is recorded at the same time.
In the test operation process, when the increase speed of the chip quantity of different sizes monitored by the lubricating oil chip sensor exceeds a chip preset value, the chip quantity is immediately compared with the output current in the same state, if the output current exceeds the current threshold value of the current value in the same state, the supporting point support is judged to be faulty, at the moment, the temperature of the supporting point bearing is verified, if the temperature of the supporting point bearing is obviously increased, the initial fault of the supporting point support is judged, and the supporting point bearing is immediately stopped, decomposed and checked and replaced.
It should be noted that, the chip end predetermined value and the current threshold value in the above process may be determined according to specific situations. In the embodiment of the application, when the increase speed of the number of the scraps of different sizes monitored by the lubricating oil scraps sensor exceeds 20 mg/hour, the number of the scraps exceeds a scraps threshold value, and when the output current exceeds 10% of the current value in the same state (or the output current is 110% of the current value in the same state), the current threshold value is exceeded.
Compared with the prior art, the fulcrum bearing monitoring method can effectively improve the monitoring capability of the fulcrum bearing, discover the initial fault of the fulcrum bearing in advance, and replace the fulcrum bearing in time when the fulcrum bearing is not lost, so that accidents of test interruption and even test bearing damage caused by the damage of the fulcrum bearing are avoided, the smooth performance of a main bearing test is ensured, the waste of resources and the repetition of work are reduced, and the progress and quality of test work are ensured.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present application should be covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (7)
1. A method for monitoring bearings of an aeroengine main bearing test, the method comprising:
obtaining the temperature of the fulcrum bearing through a temperature sensor arranged on the outer ring of the fulcrum bearing;
a lubricating oil dust sensor is arranged on an oil supply circuit of the fulcrum bearing, and metal dust in lubricating oil for lubricating the fulcrum bearing is obtained through the lubricating oil dust sensor; and
obtaining output power of test equipment for operation of the aero-engine;
when the metal scraps detected by the lubricating oil scraps sensor exceed a scraps threshold and the output power of test equipment in the same state of the aeroengine exceeds a power threshold, judging whether the temperature of the fulcrum bearing exceeds the temperature threshold, if so, judging that the fulcrum bearing fails, and if not, judging that the fulcrum bearing does not fail.
2. A method of monitoring bearings for an aircraft engine main bearing test according to claim 1, wherein the temperature threshold is obtained from a predetermined increase in the fulcrum bearing maximum temperature at a high state of the stabilized aircraft engine over a plurality of cycles of aircraft engine operation.
3. A method of bearing monitoring for an aeroengine main bearing test as claimed in claim 2, wherein the predetermined value of increase is 10 ℃.
4. A method of monitoring bearings for an aeroengine main bearing test as claimed in claim 1, wherein the rate of increase of the number and size of the metal flakes is obtained when the metal flakes are detected by a lubricating oil flakes sensor.
5. A method of monitoring bearings for an aircraft engine main bearing test as defined in claim 4, wherein said metal end growth rate has an end threshold of 20 mg/hour.
6. A method of monitoring bearings for an aero-engine main bearing test as claimed in claim 1, wherein the output power of the test apparatus is characterised by the output current.
7. A method of bearing monitoring for an aircraft engine main bearing test as defined in claim 6 wherein the output current threshold indicative of output power is 110% of the output current for the same state of the aircraft engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111436573.5A CN114427970B (en) | 2021-11-29 | 2021-11-29 | Bearing monitoring method for aeroengine main bearing test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111436573.5A CN114427970B (en) | 2021-11-29 | 2021-11-29 | Bearing monitoring method for aeroengine main bearing test |
Publications (2)
| Publication Number | Publication Date |
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| CN114427970A CN114427970A (en) | 2022-05-03 |
| CN114427970B true CN114427970B (en) | 2024-01-30 |
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