Temperature compensation method for damage monitoring of electromechanical impedance structure

Abstract

The invention discloses a temperature compensation method for the damage monitoring of an electromechanical impedance structure. The method comprises the following steps: the impedance (admittance) signal of a detected test piece is measured and analyzed to study influence of temperature change on the impedance signal; the real part and the imaginary part of the impedance spectrum of the measuredstructure drift in a certain direction with the change of the temperature; a reference signal is compensated by a temperature compensation algorithm based on minimum RMSD, and the frequency and the amplitude compensation quantity of a reference signal are curve-fitted to obtain a relationship between the temperature and two compensation quantities, that is, a reference signal temperature compensation quantity fitting curve; and using the reference signal temperature compensation quantity fitting curve to compensate different temperature monitoring signals. The effective quantitative temperature compensation algorithm based on the electromechanical impedance technology can compensate the damage impedance (admittance) signal in any experimental temperature range, so the accuracy of damage location and quantification based on the electromechanical impedance technology in structural health monitoring is improved.

Description

technical field [0001] The invention relates to a temperature compensation method for damage monitoring of electromechanical impedance structures, and belongs to the technical fields of nondestructive testing technology and structural health monitoring. Background technique [0002] With the continuous development of science, technology and industry, various materials are more and more widely used in engineering structures, mechanical structures are becoming more and more complex, and equipment functions are becoming more and more perfect. At the same time, the requirements for materials and structures are also increasing. higher. Structural health monitoring is a very active research field in mechanical and structural engineering, and the research in this field has a wide and far-reaching engineering background. Once the material is damaged, the structural health is compromised. The decline of the bearing capacity of the structure during the service period is defined as t...

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Problems solved by technology

[0006] The purpose of the present invention is to design and propose a kind of effective quantitative temperature compensation algorithm based on minimum RMSD to eliminate the impact of environmental temperature on monitoring results in the monitoring process, aiming at the situation that the structural health monitoring technology based on electromechanical impedance method is easily disturbed by environmental temperature factors. Impact

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