Method, system, device and medium for online monitoring of plane stress field without baseline data based on piezoelectric transducer array
US12203818B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 2022 |
| Grant date | Jan 21, 2025 |
| Priority date | — |
| Expiry date | May 23, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2203/0676
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The disclosure provides a method, system, device and medium for online monitoring of a plane stress field without baseline data based on a piezoelectric transducer array. Since Lamb waves have complex multi-mode characteristics, a suitable excitation frequency needs to be selected according to geometric dimensions of the structure to be measured, and then, only low-order mode Lamb waves are excited inside the measured structure to avoid serious waveform aliasing. For isotropic measured objects, anisotropic characteristics will be generated under the action of pre-stresses, that is, the propagation velocities of ultrasonic waves in all directions are different, but there is a linear relationship between velocity changes in different propagation directions and stresses. Therefore, there is still a linear relationship between the difference of velocity changes in different propagation directions and the stress. According to this characteristic, a characterization method of an absolute stress field without baseline data can be implemented. The method of the disclosure can make full use of the low attenuation characteristics of the Lamb waves to realize online monitoring of the plane st…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.