Tension and pressure stress sensitive frequency band identification method and device based on piezoelectric impedance data

The invention discloses a tension and compression stress sensitive frequency band identification method and device based on piezoelectric impedance data, and belongs to the field of structural health monitoring, and the method comprises the steps: collecting the response admittance values of a to-be-identified tension and compression stress structure under the effects of different sweep frequencies and loads; a sensitive frequency band segmentation step length is set to segment a sweep frequency range, and the sensitivity of all sub-frequency bands obtained through segmentation is calculated by taking a standard deviation as a sensitivity index; and selecting a sub-frequency band with the maximum sensitivity as a tension and pressure stress sensitive frequency band. According to the method, the electrical impedance frequency spectrum of the whole process from the initial state to the damaged state of the stress structure is measured through the PZT sensor, and the tension-compression stress sensitive frequenc