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Optical fiber sensing system for engine internal flow channel vibration test

An optical fiber sensing system, vibration testing technology, applied in engine testing, machine/structural components testing, measuring devices, etc.

Active Publication Date: 2021-04-09
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Common MEMS vibration sensors mainly adopt a support beam-mass sensitive structure. The mass generates displacement under the action of acceleration load, and finally detects the magnitude of the acceleration load. The vibration sensor with support beam-mass structure has high sensitivity. The sensor has high sensitivity and high resolution, but there is a mutual restrictive relationship between the working range, frequency response range and sensitivity, and different structural sizes will produce different performance indicators

Method used

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  • Optical fiber sensing system for engine internal flow channel vibration test
  • Optical fiber sensing system for engine internal flow channel vibration test
  • Optical fiber sensing system for engine internal flow channel vibration test

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] An optical fiber sensing system for vibration testing of an engine inner flow channel comprises an optical fiber vibration sensor, a transmission optical cable, a high-frequency dynamic signal optical fiber demodulator and a computer.

[0025] The optical fiber vibration sensor includes: a substrate 1, a low-frequency sensitive structural layer 2, a limiting layer 3, a high-frequency sensitive structural layer 4 and a protective layer 5; the substrate 1 is a groove structure; the middle of the low-frequency sensitive structural layer 2 is Mass block 9, the mass block 9 is connected and fixed by a cantilever beam 10; the limiting layer 3 is a structure with grooves up and down, and a through hole 6 in the middle; the middle of the high-frequency sensitive structure layer 4 is The quality block 7 is connected and fixed by a cantilever beam 8 ; the protective layer 5 is a groove structure with two through holes 6 .

[0026]The acceleration measurement range of the low-freq...

Embodiment 2

[0030] An optical fiber sensing system for vibration testing of an engine inner flow channel comprises an optical fiber vibration sensor, a transmission optical cable, a high-frequency dynamic signal optical fiber demodulator and a computer.

[0031] The optical fiber vibration sensor includes: a substrate 1, a low-frequency sensitive structural layer 2, a limiting layer 3, a high-frequency sensitive structural layer 4 and a protective layer 5; the substrate 1 is a groove structure; the middle of the low-frequency sensitive structural layer 2 is Mass block 9, the mass block 9 is connected and fixed by a cantilever beam 10; the limiting layer 3 is a structure with grooves up and down, and a through hole 6 in the middle; the middle of the high-frequency sensitive structure layer 4 is The quality block 7 is connected and fixed by a cantilever beam 8 ; the protective layer 5 is a groove structure with two through holes 6 .

[0032] The acceleration measurement range of the low-fre...

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Abstract

The invention relates to an optical fiber sensing system for engine internal flow channel vibration test, and belongs to the field of engine testing. According to the method, a composite sensitive structure is used as a core device of an optical fiber vibration sensor, and is connected with an optical fiber demodulator through an optical cable to construct an optical fiber vibration sensing system, so that vibration measurement of a structural member under a large g value (1g-500g) and a broadband (5Hz-20kHz) at a high temperature (less than or equal to 500 DEG C) is realized. Through parameter design of the composite sensitive structure of the optical fiber vibration sensor, the high-frequency large-g-value sensitive structure and the low-frequency small-g-value sensitive structure are connected with each other in a g value measurement range, frequency response and resolution, so that the wide-frequency-response and wide-range engine vibration test requirements are met. The sensing system has the characteristics of high temperature resistance, wide frequency response and large measuring range, can solve the problems of narrow space, high temperature and the like of a measured part, can transfer the vibration measurement of the engine from the outer casing to the interior of the engine closer to a vibration source, and improves the accuracy of the vibration measurement of the engine.

Description

technical field [0001] The invention relates to an optical fiber sensing system for vibration testing of an engine inner flow channel, which belongs to the technical field of engine testing and can be used for high temperature vibration testing in narrow spaces such as engine inner flow channels. Background technique [0002] The vibration problem of the whole aircraft engine has always been a prominent problem that plagues the production and use of the engine. According to statistics, more than 60% of the aircraft engine failures are vibration failures. Changes in operating conditions, through vibration measurement, to ensure that the cause and possible location of the fault are identified before the accident occurs, hidden dangers are eliminated in time, and the reliability and safety of the engine operation are improved. The causes of aero-engine vibration generally include two situations. One type belongs to the regular vibration source related to the rotor speed: the mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00G01M15/02
CPCG01H9/004G01M15/02Y02T90/00
Inventor 陈爽隋广慧张欣颖
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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