Non-contact-measurement closed-loop-vibration blade fatigue testing method

A non-contact measurement and vibration test technology, applied in the field of blade vibration fatigue, can solve the problems of inability to test small blade fatigue, long fatigue test cycle, low efficiency, etc., to improve control accuracy and measurement accuracy, reduce labor intensity, and ensure accuracy sexual effect

Active Publication Date: 2013-06-26
SUZHOU DONGLING VIBRATION TEST INSTR
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AI Technical Summary

Problems solved by technology

Using this method to perform fatigue tests on blades takes a long period and is inefficient; at the same time, due to the size limitation of the hydraulic servo actuator, it is impossible to carry out fatigue tests on small blades; the second is to use a vi

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  • Non-contact-measurement closed-loop-vibration blade fatigue testing method

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Example Embodiment

[0026] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and a preferred embodiment.

[0027] The closed-loop vibration test method for blade fatigue non-contact measurement involved in this embodiment can use figure 1 The system implementation shown can include:

[0028] An electric vibrating table 1 for providing an exciting force to the blade 6 and at least keeping the blade 6 in a resonance state during the test;

[0029] Acceleration sensor 3 for constant vibration frequency sweeping;

[0030] A clamp 8 for clamping the blade 6 and a compression screw 81 for adjusting the clamping force of the blade 6;

[0031] Strain sensor 5 for monitoring changes in the stress of the blade 6;

[0032] A laser displacement sensor 4 for monitoring the amplitude of a selected part of the blade 6; and,

[0033] The measurement control unit 2 is used to receive and process the signals of the strain sensor 5 and the laser displ...

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Abstract

A non-contact-measurement closed-loop-vibration blade fatigue testing method includes: fixing a blade on the surface of a workbench of an electric vibration table, controlling the electric vibration table to perform sine sweeping via a measurement control unit; controlling the electric vibration table to vibrate at the point of resonance of the blade via the measurement control unit, measuring stress of the blade and vibration amplitude of a selected portion of the blade at the same time so as to confirm the corresponding relation between the stress and the vibration amplitude of the selected portion of the blade, further confirming a given vibration amplitude, of the selected portion of the blade, corresponding to a given stress, starting to count circularly; keeping the vibration amplitude of the selected portion of the blade within the given vibration amplitude, and judging whether the blade cracks or loses effect or not according to set judging references and variation of resonant frequency of the blade, or when a target circulating number is reached and the resonant frequency of the blade does not vary, stopping the electric vibration table. By the non-contact-measurement closed-loop-vibration blade fatigue testing method, full automation can be realized, labor intensity of testing workers can be lowered, controlling precision and measuring precision can be effectively improved, and accuracy of test data is guaranteed.

Description

technical field [0001] The invention relates to a method for vibration fatigue of blades, in particular to a method for testing blade fatigue by realizing closed-loop vibration through non-contact measurement. Background technique [0002] During the operation of aero-engines, blade failures often lead to various failures, and even the consequences of aircraft crash and death. The failures are mainly manifested as blade body cracks, breakage, blade tip wear, blade deformation, etc. The failure of the blade is largely related to the fatigue resistance of the blade structure and blade material. For this reason, during the design process of the blade, the fatigue test will be carried out on the structure of the blade and the material of the blade to maximize the service life of the blade. [0003] There are mainly two methods for existing blade fatigue testing. One is to use a hydraulic servo actuator to add force and measure the strain of the blade at the same time, and to ac...

Claims

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Application Information

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IPC IPC(8): G01M7/02
Inventor 吴国雄张允甲
Owner SUZHOU DONGLING VIBRATION TEST INSTR
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