Abstract
This paper presents a method for Real-Time Hybrid Model testing (ReaTHM testing) of ocean structures. ReaTHM testing is an extension to traditional hydrodynamic model-scale testing, where the system under study is partitioned into physical and numerical substructures. The physical and numerical subsystems are connected in real-time through a control system. Based on experience with various ReaTHM tests, a general method for ReaTHM testing of ocean structures has been proposed. An experimental case study was carried out to illustrate the proposed method. The study was conducted in a state-of-the-art hydrodynamic laboratory, where a physical cylindrical buoy was placed in a still-water basin. Horizontal mooring loads from a numerical mooring system, which were modelled using the nonlinear finite element software RIFLEX were actuated onto the physical substructure. System performance was verified through comparison with a physical horizontal mooring system consisting of physical springs.
Highlights
Ocean structures are dynamic systems governed by different physical regimes, where applications can range from e.g. offshore wind turbines, deep sea oil and gas, and aquaculture
Numerical simulations will often be insufficient to fully describe the complex hydrodynamics encountered in the design of ocean structures due to phenomena such as slamming, wave-current interactions and viscous effects
With ReaTHM testing, it is possible to mitigate this challenge by computing the wind loads numerically based on the measured platform motions and simulated wind field and rotor dynamics, which is in itself a challenge (Bayati et al, 2017), and actuate them onto the physical system
Summary
Ocean structures are dynamic systems governed by different physical regimes, where applications can range from e.g. offshore wind turbines, deep sea oil and gas, and aquaculture. When studying structures on very deep water, the general spatial constraints of basins may limit the capabilities of conventional test methods This has lead to the proposal of using real-time hybrid test methods in the design validation of ocean structures. With ReaTHM testing, it is possible to mitigate this challenge by computing the wind loads numerically based on the measured platform motions and simulated wind field and rotor dynamics, which is in itself a challenge (Bayati et al, 2017), and actuate them onto the physical system Such studies have been conducted both in 5 Degree Of Freedom (DOF) (Sauder et al, 2016; Chabaud, 2016) and 1 DOF (Oguz et al, 2018).
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