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Method for converting non-contact vibration stress measurement value of blade

A vibration stress, non-contact technology used in vibration testing, measuring devices, measurement of elastic deformation forces by measuring gauges, etc.

Active Publication Date: 2019-04-02
AECC SICHUAN GAS TURBINE RES INST
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Problems solved by technology

The vibration stress conversion method involved in the present invention is based on the principle of non-contact measurement, combined with the theoretical analysis results, mainly for processing the test data of non-contact measurement of engine blades, and solves how to accurately convert the vibration displacement of the blade tip obtained by non-contact measurement into blade tip vibration displacement. Body Vibration Stress Distribution Problem

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  • Method for converting non-contact vibration stress measurement value of blade
  • Method for converting non-contact vibration stress measurement value of blade
  • Method for converting non-contact vibration stress measurement value of blade

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Embodiment Construction

[0030] The specific process of the correction of the blade non-contact vibration stress measurement value is as follows: figure 1 shown.

[0031] It can be seen from the above figure that the correction of the non-contact vibration stress measurement value of the blade needs to be corrected in terms of the axial misalignment of the rotor stator and the vibration deformation of the blade. Here, taking the first-stage rotor blade of a certain engine fan component as an example, the correction method Make an introduction:

[0032] 1) Correction for axial misalignment of rotor and stator

[0033] The engine coordinate system is defined as a right-handed Cartesian coordinate system: X is along the axial direction of the engine, positive along the airflow direction, Z is vertical along the engine, positive vertically upward, and the Y axis is determined by the right-hand rule. Figure 2a-2b It is a schematic diagram of thermal axial deformation of fan rotor and stator components o...

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Abstract

The invention discloses a method for converting a non-contact vibration stress measurement value of a blade. The method comprises: step one, correction of axial displacement of a rotor and a stator iscarried out; to be specific, axial displacement amounts X0 of the rotor and the stator are determined, wherein the X0 is based on the formula: X1-(X2+X3), the X1 expresses the axial displacement of ameasurment sensor relative to the reference position, the X2 expresses the axial displacement of the mounting edge of a rotor blade relative to the reference position, and the X3 expresses the axialdisplacement of the point of the rotor blade relative to the mounting edge of the rotor blade; step two, correction of blade vibration deformation is carried out; to be specific, an actual measured point of the blade tip of the rotor blade is determined by the axial displacement amounts X0, a scaling coefficient K is obtained by combining the actually measured vibration displacement of the blade tip and relative vibration displacement distribution obtained by a finite element method, and the relative vibration stress displacement distribution sigma<I'> determined by the finite element method is divided by the relative vibration displacement distribution scaling coefficient K to obtain actual vibration stress distribution sigma.

Description

technical field [0001] The invention relates to a method for converting vibration stress measurement values, in particular to a non-contact vibration stress measurement value conversion method for aeroengine blades. Background technique [0002] The invention starts from the basic principle of the non-contact measurement of the blade tip timing method, and clarifies the conversion method of the non-contact measurement of the vibration displacement of the blade tip to the vibration stress of the blade body. By combining the experimental data and theoretical calculation results, the process and method of converting the non-contact measurement vibration displacement of the blade into the vibration stress distribution of the blade are clarified. The non-contact vibration stress measurement value conversion method adopted in the present invention has been applied to the dynamic stress measurement of the QC engine fan rotor blade. And in order to verify the reliability of the met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/04G01M7/02
CPCG01L1/04G01M7/02
Inventor 何凌川刘亮王梅黎方娟
Owner AECC SICHUAN GAS TURBINE RES INST
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