Till date, some primitive non-destructive tests (dye-penetrant, magnetic particle etc.) has been the most prevalent method of structural inspections, which makes the inspection process extremely laborious as well as costly. In civil-structures, often the critical parts are not be readily accessible and demand removal of the existing finishes (such as false ceilings). These considerations call for a means of SHM, such system can achieve a significant reduction in the inspection time, effort and cost. SHM is defined as the acquisition, validation and analysis of technical data to facilitate life cycle management decisions.
SHM denotes a reliable system with the ability to detect and interpret adverse ‘changes’ in a structure due to damage or normal operations. Such a system typically consists of sensors, actuators, amplifiers and signal conditioning circuits. While sensors are employed to predict damage, the actuators serve to excite the structure or decelerate/ arrest the damage.