Velocity field detection method using the elastic wave of a damaged bolster
AbstractThe paper aims to solve the technical problem of damage detection of an EMU body bolster. It establishes an elastic wave and elastic modulus mathematical model using the elastic body wave differential equation. A mathematical model of damage level and elastic wave velocity is established using damage mechanics theory. The Ultrasonic Tomography Technique and the Algebraic Reconstruction Technique (ART) are used to detect the discrete wave velocity field in the bolster testing area, thus completing the nephogram analysis of the whole bolster damage state. Taking the area between actual bolster positioning and support location as a test example, the paper finds that the elastic wave velocity field and the damage state distribution of the bolster are consistent with the actual state of the EMU body bolster.
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