Structural Health Monitoring of Pressure Vessel Based on Guided Wave Technology. Part I：Wave Propagating and Damage Localization

The safety of pressure vessel is threatened by the harsh service environment in real engineering fields. Guided waves could propagate over long distance with larger area, and its application in pressure vessel monitoring could help avoiding the failure of the vessels. This research focus on the structural health monitoring of the pressure vessel by guided waves, and it is divided into three parts. The first part mainly investigates the guide wave propagating behavior and its application in damage localization in a typical pressure vessel. The guide wave propagating behavior in a pressure vessel is firstly studied by finite element method. The damage localization algorithm of the cylinder and head section of the pressure vessel is respectively built, and the effect of the signal processing method on the damage localization accuracy is mainly discussed. Results show that propagation of guided wave in the vessel could easily leads to the multimode, and it keeps propagating until the wave energy is completely attenuated with less wave reflection at the boundary. Selecting the suitable propagating duration, wave filtering and noise reduction could help enhancing the damage localization accuracy. The zero time difference between the damage and baseline signal and unused wave mode influence are the two factors that affect the damage localization accuracy in pressure vessel. Damage localization error in the cylinder and head section of the pressure vessel keeps into 5% after modified the two mentioned factors.