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Blade crack positioning method for calculating nonlinear index based on alternative data method

A technology that replaces data and positioning methods. It is applied in processing detection response signals, using sound waves/ultrasonic waves/infrasonic waves to analyze solids, and using sound waves/ultrasonic waves/infrasonic waves for material analysis. It can solve problems that have not proposed specific solutions, etc. Achieve the effects of improving material utilization, strong practicability, and timely maintenance

Pending Publication Date: 2020-07-03
FOSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be seen that for the location of blade cracks, there are still many practical problems that need to be solved urgently in its practical application (such as improving the convenience of blade crack location, etc.) and many specific solutions have not been proposed.

Method used

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  • Blade crack positioning method for calculating nonlinear index based on alternative data method
  • Blade crack positioning method for calculating nonlinear index based on alternative data method
  • Blade crack positioning method for calculating nonlinear index based on alternative data method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The present invention makes two small blades with crack damage at different positions by measuring the nonlinear vibration data of multiple positions. On the center line, set the position mark points, arranged horizontally at equal intervals, and the number is 15, such as figure 2 shown.

[0054] Based on the machine vision measurement device to collect the vibration response signals of multiple points, the schematic diagram of the blade crack location system based on the calculation of the nonlinear index based on the substitute data is shown in Fig. image 3 As shown, it includes a blade 1, a base 2, a vibrator 3, an industrial camera 4, a computer vibrator control system 6, an acceleration sensor 8, an image acquisition system 9 and a general controller. The root end of the blade 1 is fixed on the base 2, and the other end is in a free state; and the blade 1 is fixedly connected to the exciter 3 through an adhesive thimble, and an acceleration sensor is pasted near...

Embodiment 2

[0056] Corresponding to the blade crack location system based on the substitution data method to calculate the nonlinear index described in the first embodiment, this embodiment provides a blade crack location method based on the substitution data method to calculate the nonlinear index. Such as figure 1 As shown, the blade crack location method includes the following steps:

[0057] Step 1, arranging equidistant marker points on the blade, and determining the position of the marker points;

[0058] Step 2, for the blade structure with fatigue cracks, collecting the vibration response signals of the positions of the marked points of the blade under random signal excitation;

[0059] Step 3, performing signal preprocessing according to the nonlinear vibration response signal of each marker point under the random signal excitation condition;

[0060] Step 4, using the substitution data method to calculate the nonlinear index for the preprocessed vibration signal of each marke...

Embodiment 3

[0080] Such as figure 1 As shown, a blade crack location method based on the substitution data method to calculate the nonlinear index includes the following steps:

[0081] Step 1, arranging equidistant marker points on the blade, and determining the position of the marker points;

[0082] Step 2, for the blade structure with fatigue cracks, collecting the vibration response signals of the positions of the marked points of the blade under random signal excitation;

[0083] Step 3, performing signal preprocessing according to the nonlinear vibration response signal of each marker point under the random signal excitation condition;

[0084] Step 4, using the substitution data method to calculate the nonlinear index for the preprocessed vibration signal of each marked point position, and obtain the nonlinear index sequence corresponding to the marked point position;

[0085] In step 5, the maximum value of the obtained nonlinear index sequence is retrieved to realize accurate...

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Abstract

The invention provides a blade crack positioning method for calculating a nonlinear index based on an alternative data method. The method comprises steps of 1, arranging mark points distributed at equal intervals on a blade, and determining positions of the mark points; 2, acquiring a vibration response signal of each mark point position of the blade under the excitation of a random signal; 3, performing signal preprocessing according to a nonlinear vibration response signal of each mark point position under the random signal excitation condition; 4, calculating a non-linear index for the preprocessed vibration signal of each mark point position by adopting a substitution data method to obtain a non-linear index sequence corresponding to the mark point position; and 5, retrieving the maximum value of the obtained nonlinear exponential sequence to realize accurate positioning of the crack area. The method is advantaged in that blade vibration signals in a crack-free state do not need tobe collected, the crack position can be positioned by directly utilizing the vibration signals of the crack blade under the random signal excitation condition, the vibration signals are convenient totest, and practicability is very high.

Description

technical field [0001] The invention relates to the technical field of blade structure crack detection, in particular to a blade crack location method based on a substitute data method for calculating nonlinear indices. Background technique [0002] The general vibration mode identification method is to obtain the free vibration response or impulse response of the structure by measuring the excitation and response signals, which is relatively easy for the laboratory model, but it is not easy for the health monitoring of the blade structure under the operating state of the natural environment , the blade structure is complex, the size is large, it is not easy to be artificially excited, but it is easily affected by random excitation in the natural environment, so it is very practical to analyze the vibration response signal of the blade under random excitation. The existing invention patents based on vibration response signals of distributed points seldom use the vibration re...

Claims

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Application Information

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IPC IPC(8): G01N29/04G01N29/44
CPCG01N29/045G01N29/4472G01N2291/023G01N2291/0289
Inventor 蒋勉邝应炜柴牧卢清华王宇华
Owner FOSHAN UNIVERSITY