Monitoring Monopile Penetration Through Magnetic Stray Field Measurements

Conference paper (2020)

Authors

P.C. Meijers Dynamics of Structures - CEG
A. Tsouvalas Dynamics of Structures - CEG , Offshore Engineering - CEG
A. Metrikine Engineering Structures , Offshore Engineering - CEG
Research Group
Offshore Engineering (CEG) (TU Delft)
Copyright: © 2020 P.C. Meijers, A. Tsouvalas, A. Metrikine
DOI: https://doi.org/10.47964/1120.9102.19534
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Published Date

2020

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Hydraulic Engineering

Research Group

Offshore Engineering

Abstract

Current methods to infer the penetration of a steel monopile during an offshore installation are rather inaccurate. Since a large number of foundation piles will be installed offshore in the coming years, a reliable technique to infer the penetration depth is vital. This paper proposes a non-contact method to monitor the pile progression into the seabed based on measurements of the magnetic stray field that permeates the air surrounding the structure, eliminating the necessity of a predefined pattern on the pile’s surface. A simple magnetisation model for the monopile is proposed from which the relative motion between the moving pile and a stationary magnetic field sensor can be extracted. Comparison between the measured and simulated stray field data show a promising correlation, providing the basis for the new non-contact monitoring technique that is applicable offshore.

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