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Impedance modulation damage detection method for fatigue crack

A fatigue crack and damage detection technology, which is applied in the direction of material impedance, can solve the problem of not being able to obtain the reference signal, and achieve the effect of reducing complexity, measuring cost and saving cost

Inactive Publication Date: 2018-11-16
武汉珈鹰智能科技有限公司
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AI Technical Summary

Problems solved by technology

The electromechanical impedance method usually needs to measure the data in the state of health as a reference signal. However, in actual working conditions, due to the influence of factors such as the changing environment, it is impossible to obtain the correct reference signal.

Method used

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  • Impedance modulation damage detection method for fatigue crack
  • Impedance modulation damage detection method for fatigue crack
  • Impedance modulation damage detection method for fatigue crack

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Embodiment Construction

[0026] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0027] Such as Figures 1 to 4 As shown, the present invention provides an impedance modulation damage detection method for fatigue cracks, the detection method steps are as follows:

[0028] Step 1, setting a single piezoelectric smart sensor 2 on the structure to be tested 1, and setting the piezoelectric sheet 5 as an actuator and a sensor;

[0029] Step 2: Connect the NI acquisition device 8 in parallel on the pure resistance 9, and then connect the piezoelectric sheet 5 and the NI excitation device 7 in series. The pure resistance 9 and the piezoelectric sheet 5 form a self-sensing circuit...

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Abstract

The invention relates to an impedance modulation damage detection method for a fatigue crack. An NI system and a self-made self-sensing circuit are used to carry out impedance measurement, so the costof the method in the invention is greatly less than that of traditional impedance meter measurement, and the method is suitable for various environments and conditions, can effectively detect the damages of nonlinear fatigue cracks, ensures that the nonlinear fatigue crack damages of a structure can be timely founds, does not need measurement of a reference signal in the healthy state of the structure, is not affected by environment factors, such as the temperature, can complete the measurement only through one piezoelectric plate, and reduces the complexity and the measurement cost of fatigue crack damage detection.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing, in particular to an impedance modulation damage detection method for fatigue cracks. Background technique [0002] Active sensing technology based on structural health monitoring and non-destructive testing has proved its practicability in the damage or defect detection of structures such as civil engineering, aerospace and machinery. At present, the commonly used detection methods include nonlinear ultrasonic testing methods, electromechanical impedance methods , Lamb wave damage detection method, etc. Among them, the electromechanical impedance method has been widely used because of its high-frequency excitation and its sensitivity to small damage. The electromechanical impedance method usually needs to measure the data in the state of health as a reference signal. However, in actual working conditions, due to the influence of factors such as the changing environment, it is imp...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/02
CPCG01N27/02
Inventor 江汶张守诚谢学多
Owner 武汉珈鹰智能科技有限公司
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