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research-article

Inverse Estimation of Local Slamming Loads on a Jacket Structure

[+] Author and Article Information
Ying Tu

Department of Civil and Environmental Engineering, Norwegian University of Science and Technology, Trondheim, 7491, Norway
ying.tu@ntnu.no

Thorvald C. Grindstad

Kongsberg Digital AS, Trondheim, 7040, Norway
thorvald.grindstad@gmail.com

Michael Muskulus

Department of Civil and Environmental Engineering, Norwegian University of Science and Technology, Trondheim, 7491, Norway
michael.muskulus@ntnu.no

1Corresponding author.

ASME doi:10.1115/1.4037175 History: Received March 17, 2017; Revised June 22, 2017

Abstract

Slamming loads from plunging breaking waves feature a high impulsive force and a very short duration. It is difficult to measure these loads directly in experiments due to the dynamics of the structures. In this study, inverse approaches are investigated to estimate the local slamming loads on a jacket structure using hammer test and wave test data from a model scale experiment. First, a state-of-the-art approach is considered. It uses two deconvolution techniques to first determine the impulse response functions, then to reconstruct the wave impact forces. Second, an easier applicable approach is proposed. It uses linear regression with the ordinary least square technique for the force estimation. The results calculated with these two approaches are highly identical. The linear regression approach can be extended to account for the loads transferred among different locations. This leads to lower and theoretically more accurate estimation of the loads compared to the previous two approaches. For the investigated case, the total impulse due to the wave is 22% lower. The estimated forces by the extended approach have a resolution at the millisecond level, which provides detailed information on the shape of the forces. The approach is an important tool for statistical investigations of the local slamming forces, and further on for the development of a reliable engineering model of the forces.

Copyright (c) 2017 by ASME
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