SYSTEMS AND METHODS OF GENERATING DAMAGE INDEX VALUES IN A NETWORK FOR STRUCTURAL HEALTH MONITORING

摘要

A system and a method of generating damage index values in a network for structural health monitoring are provided to determine the structural condition by using different types of methods, such as bisection, intersection, and adaptive-neural-fuzzy-inference positioning of network paths, where the technique is incorporated with convex-set interpolation. A patch sensor(100) includes: a substrate(102) configured to attach to a host structure; a hoop layer(104); a piezoelectric device(108) for generating and/or receiving signals; a buffer layer(110) for providing mechanical impedance matching and reducing thermal stress mismatch between the substrate and the piezoelectric device; two electrical wires(118a,118b) connected to the piezoelectric device; a molding layer(120) for securing the piezoelectric device to the substrate; and a cover layer(106) for protecting and sealing the molding layer. The piezoelectric device includes: a piezoelectric layer(116); a bottom conductive flake(112) connected to the electrical wire(118b); and a top conductive flake(114) connected to the electrical wire(118a). The piezoelectric device operates as an actuator when a pre-designed electric signal is applied through the electric wires. Upon application of an electrical signal, the piezoelectric layer deforms to generate Lamb waves.