Fisher Information–Based Optimal Sensor Locations for Structural Identification of Nonclassically Damped Systems
Publication: Journal of Engineering Mechanics
Volume 150, Issue 10
Abstract
The investigation of optimal sensor location problems in the field of vibration-based structural identification is predominantly performed for classically damped systems. In this study, a methodology is introduced to obtain the optimal sensor locations for identifying the structural (modal as well as physical) parameters of a nonclassically damped system. The optimal sensor locations are obtained by maximizing the determinant of the estimated Fisher information matrix out of all possible sensor combinations, such that the measurements would have maximum information about the parameters of interest. To deal with the inherently complex characteristics of the eigenvalues and mode shapes of nonclassically damped structures, the formulation is carried out in the state-space framework. To illustrate the approach numerically, primary-secondary systems exhibiting nonclassical damping behavior have been used. The methodology is also validated with experimental data from shake-table tests conducted on a primary-secondary structure. It is shown that the uncertainty in the estimated parameters is minimum when the sensors are placed at the optimal locations.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
Financial support for this work has been provided by the Science and Engineering Research Board (SERB, DST, India) under Grant No. ECR/2017/003430. The financial support is gratefully acknowledged.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 150 • Issue 10 • October 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Dec 7, 2023
Accepted: Apr 23, 2024
Published online: Jul 16, 2024
Published in print: Oct 1, 2024
Discussion open until: Dec 16, 2024
ASCE Technical Topics:
- Continuum mechanics
- Damping
- Detection methods
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Field tests
- Laboratory tests
- Mathematics
- Measurement (by type)
- Methodology (by type)
- Motion (dynamics)
- Oscillations
- Parameters (statistics)
- Sensors and sensing
- Shake table tests
- Solid mechanics
- Statistics
- Structural dynamics
- Structural engineering
- Structural system identification
- Structural systems
- Tests (by type)
- Vibration
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