E. Lourens
80 records found
1
Authored
Quasi-periodic loading resulting from waves and a rotationally sampled wind field often leads to fatiguedriven designs for offshore wind turbine support structures. The uncertainty on wind and wave loading, together with large modelling uncertainties, lead to large discrepancies
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Knowledge of excitation loads on bridges are important for reliable design. Load models are however prone to uncertainties. Force identification using dynamic response measured on full-scale structures can be used to reduce the
uncertainty. In this contribution, numerical sim ...
uncertainty. In this contribution, numerical sim ...
The Norwegian Public Roads Administration is reviewing the possibility of using floating bridges as fjord crossings. The dynamic behaviour of very long floating bridges with novel designs are prone to uncertainties. Studying the dynamic behaviour of existing bridges is valuable f
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This paper presents a validation of a recently developed joint input-state estimation algorithm for force identification and response estimation in structural dynamics, using data obtained from in situ experiments on a footbridge. First, the algorithm is used to identify two impa
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This paper presents a verification of a state-of-the-art joint input-state estimation algorithm using data obtained from in situ experiments on a footbridge. A dynamic model of the footbridge is based on
a detailed finite element model that is calibrated using a set of experimen
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Sensor network for dynamic ice-force identification
The Hanko-1 channel marker case study
A measurement campaign at the Hanko-1 channel marker in the Gulf of Finland is planned in order to monitor the forces leading to ice-induced vibrations by means of force identification. It is planned to identify the ice forces using a joint input-state estimation algorithm in con
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Support structures of offshore wind turbines are prone to failure from fatigue damage. The design for fatigue requires accurate predictions of the environmental conditions and an adequate definition of the structural properties, valid for the entire design life-time. Estimates of
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A simplified model of a typical bottom-founded structure was forced through ice sheets in a laboratory experiment to study ice-induced vibrations. The ice forces exerted on the structure are identified in conjunction with the response of the entire structure using a joint input-s
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In structural dynamics, the forces acting on a structure are in many cases not well known. System inversion techniques may then be used to estimate these forces from the measured response of the structure. This paper presents conditions for the invertibility of linear system mode
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An existing joint input-state estimation algorithm is extended for applications in
structural dynamics. The estimation of the input and the system states is performed in a minimum-variance unbiased way, based on a limited number of response
measurements and a system model. The no
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Contributed
SJOEM, the Simple Jacket Optimization Engineering Model
A small tool to assist with large decisions
One of the main drawbacks of offshore wind energy is its high levelized cost of electricity (LCOE). One explanation for these high costs arises from the large amount of uncertainties that come with such complex projects. As a result of this complexity, it’s difficult to foresee t
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