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research-article

Underwater Dynamic Response at Limited Points Expanded to Full-Field Strain Response

[+] Author and Article Information
Yuanchang Chen

Structural Dynamics and Acoustic Systems Laboratory University of Massachusetts Lowell, One University Avenue, Lowell, MA 01854
Yuanchang_Chen@student.uml.edu

Dagny Joffre

Structural Dynamics and Acoustic Systems Laboratory, University of Massachusetts Lowell, One University Avenue, Lowell, MA 01854
Dagny_Joffre@student.uml.edu

Peter Avitabile

Professor Emeritus of Mechanical Engineering, Structural Dynamics and Acoustic Systems Laboratory, University of Massachusetts Lowell, One University Avenue, Lowell, MA 01854
Peter_Avitabile@uml.edu

1Corresponding author.

ASME doi:10.1115/1.4039800 History: Received April 18, 2017; Revised March 21, 2018

Abstract

Expansion of real-time operating data from limited measurements to obtain full field displacement data has been performed for structures in air. This approach has shown great success and its main advantage is that the applied forces do not need to be identified. However, there are applications where structures may be immersed in water and the full field real time response may be needed for design and structural health assessments. This paper presents the results of a structure submersed in water to identify full field response using only a handful of measured data. The same approach is used to extract the full field displacements and the results are compared to the actual full field measured response. The advantage of this approach is that the force does not need to be identified and, most importantly, the damping and fluid structure interaction does not need to be identified in order to perform the expansion. The results show excellent agreement with the measured data.

Copyright (c) 2018 by ASME
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