Piezoelectric sensor-based 3D modal analysis under shaker derived random excitations

Dattar Singh Aulakh; Suresh Bhalla

doi:10.1117/12.2612488

18 April 2022 Piezoelectric sensor-based 3D modal analysis under shaker derived random excitations

Dattar Singh Aulakh, Suresh Bhalla

Proceedings Volume 12047, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XVI; 1204714 (2022) https://doi.org/10.1117/12.2612488
Event: SPIE Smart Structures + Nondestructive Evaluation, 2022, Long Beach, California, United States

Abstract

Modal analysis based vibration monitoring has been extensively adopted for health assessment and continuous monitoring of structures. Conventional accelerometer derived displacement based modal parameters are generally used for evaluation but with a high operational cost, fragility issues and bandwidth limitations. Strain based modal parameters have been increasingly explored for monitoring purposes owing to their high sensitivity towards any perturbation in the structural property. Piezoelectric sensors are highly sensitive, low cost, smart material based dynamic strain sensors. However, they have been sparsely investigated for their efficiency in obtaining modal parameters, specially under random excitations. This study examines the ceramic based lead-zirconate-titanate (PZT) piezoelectric sensors for their applicability in modal analysis based vibration monitoring under shaker driven random excitations. PZT patches and accelerometers were used to record the measurements of a scaled down model of pedestrian under random excitations from a mechanical shaker. Polyreference Least-Squares Complex Exponential (p-LSCE) system identification algorithm was adopted to obtain the modal parameters from both the sensors. PZT patches were equally effective as accelerometers in capturing the modal parameters namely frequency, damping and mode shapes. First ten modes under consideration were obtained by PZT patches, with an error of under one percent with accelerometers, from both the system identification techniques. Damping ratios obtained from both the sensors were in good agreement with each other. Mode shapes form the either of sensors were in excellent correlation with each other with modal assurance criteria (MAC) values higher than threshold value of 0.75.

Conference Presentation

Citation Download Citation

Dattar Singh Aulakh and Suresh Bhalla "Piezoelectric sensor-based 3D modal analysis under shaker derived random excitations", Proc. SPIE 12047, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XVI, 1204714 (18 April 2022); https://doi.org/10.1117/12.2612488

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