Supervisor:
Southwest Ordnance Industry Bureau
Organizer:
Chongqing Ordnance Industry Society
Chongqing University of Technology
Chongqing University of Technology
Research on guided wave high temperature structural damage diagnosis technique based on thermal buffer probe
| DOI: | 10.11809/bqzbgcxb2024.11.024 |
| Keywords: | guided waves; thermal buffer layer; piezoelectric chip sensor; high temperature structure; damage diagnosis |
| Abstract: | In order to develop an online monitoring method for structural damage of aircraft in high temperature environment, a monitoring technology based on P wave and Lamb wave is designed in this paper.Zirconia ceramic insulation layer is used as thermal buffer structure to reduce the thermal effect between the piezoelectric transducer and the high temperature structure.The insulation layer not only transmits guided waves to detect structural damage, but also converts the guided waves to Lamb waves at the boundary between the insulation layer and the plate for propagation in the plate shell structure.By receiving the probe, the guided wave is converted to P wave again and captured by the sensor to realize the signal sending and receiving.The thermal insulation effect and guided wave transmitting and receiving characteristics of thermal buffer structures with different sizes are analyzed experimentally.The results show that the energy and velocity of the guided wave signal will change significantly when the structure is damaged.By comparing the changes of guided wave signals before and after damage, the damage degree can be quantified, thus verifying the effectiveness and feasibility of the composite ultrasonic guided wave monitoring method in the damage monitoring ofhigh temperature structures. |
| Published: | 2024-11-30 |