Integral ultrasonic guide wave detecting method for barrel of pressure vessel
A technology for pressure vessels and ultrasonic guided waves, which is applied to the analysis of solids using sound waves/ultrasonic waves/infrasonic waves. Detection effect
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[0026] Embodiment: In the embodiment of the present invention, longitudinal ultrasonic guided wave testing is performed on a pressure vessel cylinder with a specification of Φ400×10mm and a material of 20R. The firstly calculated longitudinal guided wave phase velocity and group velocity dispersion diagrams are respectively Figure 4 , Figure 5 . Depend on Figure 5 It can be seen that when the frequency of the ultrasonic guided wave exceeds 70KHz, the group velocity of the guided wave of the mode corresponding to the A curve changes little, which facilitates the positioning of the echo. When the frequency exceeds 200KHz, guided waves of other modes will be generated. On the one hand, it will cause clutter, and on the other hand, it will also reduce the energy of the guided wave of the mode corresponding to the A curve, resulting in a decrease in the signal-to-noise ratio during detection. Therefore, the guided wave frequency is determined as 70KHz ~ 200KHz. Different inci...
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