High-accuracy composite material structure damage monitoring method

Abstract

The invention discloses a damage monitoring method for a composite material structure with high accuracy. A plurality of piezoelectric sensors are evenly arranged in the composite material structure to be tested to form a piezoelectric sensor network; a plurality of pressure sensors are selected in the sensor network as Impact monitoring pressure sensor; when an impact event occurs on the composite material structure under test, the signal collector synchronously collects the impact response signal of the impact monitoring piezoelectric sensor; performs impact monitoring according to the impact response signal, and obtains the impact event parameters; determines the damage according to the impact event parameters Monitoring area: According to the scope of the flaw detection detection area, the corresponding piezoelectric sensor is selected from the piezoelectric sensor network as the damage monitoring piezoelectric sensor, and the corresponding scanning strategy is formulated. The invention only performs damage monitoring on the damage monitoring area associated with the impact event in the composite material structure, reduces the number of Lamb wave sensing signals that need to be collected and processed, and effectively improves the damage monitoring efficiency.

Description

technical field [0001] The invention relates to the technical field of composite material structure damage monitoring, in particular to a high-accuracy composite material structure damage monitoring method. Background technique [0002] Composite material is a kind of heterogeneous material composed of two or more component materials with different properties and different forms through composite process. It not only retains the main characteristics of the original component materials, but also shows the original composition. New properties that are not available in different materials. With the advancement of science and technology, the application of composite materials in various technical fields is becoming more and more extensive. For example, in the field of aerospace technology, the proportion of composite materials in US military aircraft has increased from 2% of F-15E to F-35 / CV shipboard Type 35.2%. The Eurofighter Typhoon uses 40% composite materials. For comme...

AI Technical Summary

Problems solved by technology

There are many types of structural damage in composite materials, and the damage signal is often a mixed signal of multiple damages. At present, there is no effective separation method for mixed signals, which affects the accuracy of monitoring results.

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