Use of PZT patches as sensors in global dynamic and local EMI techniques for improved structural health monitoring


The research team at the Smart Structures and Dynamics Lab (SSDL) has developed a new approach to effectively detect the initiation and progression of structural damage by combining the global dynamic and the local electro-mechanical impedance (EMI) echniques, using the same set of surface-bonded piezo-electric ceramic (PZT) patches as sensors. The PZT patches are employed to determine the natural frequencies and the strain mode shapes of the structure (for use in the global dynamic technique) as well as to measure the electro-mechanical admittance signature (for use in the EMI technique) for an improved damage assessment. Further, low-cost variants of the EMI technique have been proposed by Dr. Bhalla’s group for cost-effective health monitoring of structures.

Sponsoring Organization: 

Armament Research and Development Establishment (ARDE), Defence Research and Development Organization (DRDO)

Contact details: 

Dr. Suresh Bhalla, Prof. Ashok Gupta

Department of Civil Engineering