Multi-parameter measurement method for vibration fatigue damage of aircraft metal component

Abstract

The invention discloses a multi-parameter measurement method for vibration fatigue damage of an aircraft metal component. The multi-parameter measurement method comprises the following steps: 1, building a vibration fatigue test system; 2, starting a vibration fatigue test system; 3, measuring a motion displacement response signal of the aircraft metal component, and marking a damage early warning signal of the aircraft metal component; 4, measuring an energy response signal of the aircraft metal component, and marking a crack state in the aircraft metal component; and 5, measuring the surface temperature value of the aircraft metal component when the acoustic emission signal trend changes, and measuring the damage position. According to the method, the change of the change trend of a motion displacement response signal is used as an early warning signal of damage of the aircraft metal component, whether the energy response trend and the counting trend suddenly increase or not is observed, and the maximum moment of the temperature standard deviation value is found in combination with the surface temperature distribution of the aircraft metal component and the change condition of the temperature standard deviation value; the occurrence and the position of the damage are comprehensively judged, and multi-parameter accurate and rapid measurement of the damage of the aircraft metal component is realized.

Description

technical field [0001] The invention belongs to the technical field of vibration fatigue damage measurement of aircraft metal components, and particularly relates to a multi-parameter measurement method for vibration fatigue damage of aircraft metal components. Background technique [0002] Structural vibration fatigue refers to a phenomenon in which the structure is fatigued and damaged by excitation such as vibration or noise. A significant difference from traditional fatigue problems is that the excitation force is time-varying and affected by structural dynamics. As an important way to verify the dynamic strength of structures, vibration fatigue test is widely used in the fields of aerospace and rail transit, and how to accurately and quickly measure the damage information during the vibration fatigue test will directly affect the test criteria, which is the vibration fatigue test. key research issues in the field. [0003] The current mainstream aircraft metal compone...

AI Technical Summary

Problems solved by technology

Although this method can detect the change of the signal after the test piece is damaged, there are two shortcomings. One is that the sensitivity is not high, and the damage information can only be measured when the state of the test piece changes significantly; It takes a period of time after the state of the test piece changes to confirm whether it is damaged or damaged by other factors. If it is impossible to judge, it needs to be shut down for inspection, which will inevitably affect the damage formation and evolution process of the test piece.

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