Blar i Publikasjoner fra CRIStin - SINTEF Ocean på forfatter "Sauder, Thomas Michel"
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Active truncation of slender marine structures: Influence of thecontrol system on Fidelity
Sauder, Thomas Michel; Marelli, Stefano; Larsen, Kjell; Sørensen, Asgeir Johan (Journal article; Peer reviewed, 2018-05)Performing hydrodynamic model testing of ultra-deep water floating systems at a reasonable scale ischallenging, due to the limited space available in existing laboratories and to the large spatial extent ofthe slender ... -
Analysis of S–N data for new and corroded mooring chains at varying mean load levels using a hierarchical linear model
Lone, Erling Neerland; Maincon, Philippe Emmanuel; Gabrielsen, Øystein; Sauder, Thomas Michel; Larsen, Kjell; Leira, Bernt Johan (Journal article; Peer reviewed, 2023)Results from full scale fatigue tests of offshore mooring chains are analyzed. The data set includes new and used chains, tested at a variety of mean load levels. The used chains have been retrieved after operation offshore ... -
Controller Analysis in Real-Time Hybrid Model Testing of an Offshore Floating System
Vilsen, Stefan Arenfeldt; Sauder, Thomas Michel; Føre, Martin; Sørensen, Asgeir Johan (ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering, Volume 7B: Ocean Engineering;OMAE2018-77859,, Chapter, 2018-06-25)This paper presents an experimental study using Real-Time Hybrid Model (ReaTHM) testing of a moored floating cylindrical buoy, conducted in a wave basin. ReaTHM testing is a method for studying the dynamics of marine ... -
Empirical estimation of low-frequency nonlinear hydrodynamic loads on moored structures
Sauder, Thomas Michel (Peer reviewed; Journal article, 2021)Low-frequency (LF) motions of floating structures are commonly modeled as the response of an oscillator to a second-order wave excitation. We present here an empirical method that reliably estimates the oscillators parameters ... -
Fatigue reliability of mooring chains, including mean load and corrosion effects
Lone, Erling Neerland; Sauder, Thomas Michel; Larsen, Kjell; Leira, Bernt Johan (Peer reviewed; Journal article, 2022)A reliability formulation for mooring chain fatigue is developed, including the effects of mean load and degradation due to corrosion. They are included by starting from a S-N model with parameterized dependence to the ... -
Fidelity of Cyber-Physical Empirical Methods
Sauder, Thomas Michel (Journal article; Peer reviewed, 2020-05-19)Cyber-physical empirical methods enable to address problems that classical empirical methods alone, or models alone, cannot address in a satisfactory way. In CPEMs, the substructures are interconnected through a control ... -
Force Tracking Using Actuated Winches with Position-Controlled Motors for Use in Hydrodynamical Model Testing
Ueland, Einar Skiftestad; Sauder, Thomas Michel; Skjetne, Roger (Peer reviewed; Journal article, 2021)In this paper, we consider the problem of accurate force control using actuated winches, intended for use in real-time hybrid hydrodynamic model testing. The paper is also relevant to other cable-driven parallel robot ... -
Hydrodynamic testing of wind-assisted cargo ships using a cyber–physical method
Sauder, Thomas Michel; Alterskjær, Sverre Anders (Peer reviewed; Journal article, 2021)A novel empirical method to study wind-assisted cargo ships is presented. The physical ship model, including propulsion units, interacts in real-time with a numerical sail model during free-running tests. Loads from the ... -
Kalman estimation of position and velocity for ReaTHM testing applications
Mehammer, Eirill Bachmann; Føre, Martin; Sauder, Thomas Michel; Chabaud, Valentin Bruno; Parisini, Thomas (Journal article; Peer reviewed, 2018)Offshore wind power research is a rapidly growing field, because of the present climate crisis and increasing focus on renewable energy. Model testing plays an important role in the risk and cost analysis associated with ... -
Multiple-degree-of-freedom actuation of rotor loads in model testing of floating wind turbines using cable-driven parallel robots
Chabaud, Valentin Bruno; Eliassen, Lene; Thys, Maxime; Sauder, Thomas Michel (Journal article; Peer reviewed, 2018)Model testing of offshore structures in ocean basins has been accepted as a necessary step for the validation and calibration of numerical models, as well as for final design checks in extreme environments. While offshore ... -
Optimal Force Allocation for Overconstrained Cable-Driven Parallel Robots: Continuously Differentiable Solutions With Assessment of Computational Efficiency
Ueland, Einar Skiftestad; Sauder, Thomas Michel; Skjetne, Roger (Peer reviewed; Journal article, 2020)In this article, we present a novel method for force allocation for overconstrained cable-driven parallel robot setups that guarantees continuously differentiable cable forces and allows for small penalized errors in the ... -
Probabilistic robust design of control systems for high-fidelity cyber–physical testing
Sauder, Thomas Michel; Marelli, Stefano; Sørensen, Asgeir Johan (Journal article; Peer reviewed, 2019-03)Cyber–physicalempirical methods consist in partitioning a dynamical system under study into a set of physical and numerical substructures that interact in real-time through a control system. In this paper, we define and ... -
Real-time hybrid model testing of a braceless semi-submersible wind turbine. Part I: The hybrid approach
Sauder, Thomas Michel; Chabaud, Valentin Bruno; Thys, Maxime; Bachynski, Erin Elizabeth; Sæther, Lars Ove (ASME Digital colletion;OMAE2016-54435, Chapter, 2016-06)This article presents a method for performing Real-Time Hybrid Model testing (ReaTHM testing) of a floating wind turbine (FWT). The advantage of this method compared to the physical modelling of the wind in an ocean basin, ... -
Real-time hybrid model testing of a braceless semi-submersible wind turbine. Part II: Experimental results
Bachynski, Erin Elizabeth; Thys, Maxime; Sauder, Thomas Michel; Chabaud, Valentin Bruno; Sæther, Lars Ove (ASME Digital colletion;OMAE2016-54437, Chapter, 2016-06)Real-Time Hybrid Model (ReaTHM) tests of a braceless semi-submersible wind turbine were carried out at MARINTEK’s Ocean Basin in 2015. The tests sought to evaluate the performance of the floating wind turbine (FWT) structure ... -
Real-Time Hybrid Model Testing of a Top Tensioned Riser: a Numerical Case Study on Interface Time-Delays and Truncation Ratio
Sauder, Thomas Michel; Sørensen, Asgeir Johan; Larsen, Kjell (ASME 2017;OMAE2017-62498, Chapter, 2017)This paper investigates the applicability of real-time hybrid model testing (ReaTHM testing) to the study of offshore systems in deep water. The focus is in particular on slender marine structures connecting floating ... -
Real-time hybrid model testing of floating wind turbines: sensitivity to limited actuation
Bachynski, Erin Elizabeth; Chabaud, Valentin Bruno; Sauder, Thomas Michel (Journal article, 2015)Real-time hybrid model testing (ReaTHM) is a new approach for conducting small-scale experimental campaign [1], [2] and [3]. In the case of a floating wind turbine in a wave basin, the aerodynamic loads on the wind turbine ...