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Structural health monitoring is a compulsory maintenance routine to structural elements such as highway overpasses, buildings, retaining walls, bridges and roads. Scientific data-acquisition systems make reliable structural measurements, even in inaccessible and harsh environments by using wireless intelligent sensor. With advances in sensor technology and availability of low cost integrated circuits, a wireless monitoring sensor network has been considered to be the new generation technology for structural health monitoring. Wireless Intelligent Sensor and Actuator Network (WISAN) has hence been developed as a vibration based structural monitoring network that allows extraction of mode shapes from output-only vibration data from a structure. The mode shape information can further be used in modal methods of damage detection.
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