Structural damage index mapping system and method

摘要

A system and method for detecting and evaluating structural defects are provided. Baseline data representative of sensed ultrasonic waves that were transmitting into a structure with no defects are stored. Ultrasonic waves are transmitted into the structure from a plurality of actuators that are coupled to the structure. The ultrasonic waves that are transmitted into the structure from the plurality of actuators are sensed, with a plurality of sensors that are coupled to the structure and spaced apart from the actuators, to thereby generate and supply sensor data. Signal difference coefficients are calculated from the baseline data and the sensor data. The calculated signal difference coefficients are spatially mapped to detect one or more structural defects in the structure.

主权项

1. A method for detecting and evaluating structural defects, comprising the steps of:
storing baseline data associated with a structure, the baseline data representative of sensed ultrasonic waves that were transmitting into the structure with no defects; transmitting ultrasonic waves into the structure from a plurality of actuators that are coupled to the structure; sensing, with a plurality of sensors that are coupled to the structure and spaced apart from the actuators, the ultrasonic waves transmitted into the structure from the plurality of actuators, to thereby generate and supply sensor data; calculating signal difference coefficients from the baseline data and the sensor data; and spatially mapping the calculated signal difference coefficients to detect one or more structural defects in the structure, wherein the signal difference coefficients (SDCs) are calculated using the following equation:SDCij=∑k=1K⁢(Xe⁢⁢0⁢⁢k-μxe⁢⁢0)⁢(Xek-μxe)∑k=1K⁢(Xe⁢⁢0⁢⁢k-μxe⁢⁢0)2⁢∑k=1K⁢(Xek-μxe)2, wherein:
Xe0k, Xek are envelopes associated with the baseline data and sensor data, respectively,μxe0, μxe are mean values of the baseline data and sensor data, respectively, andi and j are indices associated with a particular actuator and sensor, respectively.