... model is established, then the next step is to validate the model. This is often done by comparing modal parameters such as modal frequencies, damping, and mode shapes. The reason is that the modal parameters provide important insights into the stability and characteristic dynamics of the system...

... digital twin stiffness fatigue life laboratory model operational modal analysis displacement sea state superelement fatigue damage upstream oil & gas buoy data eigenmode platform natural frequency modal coordinate frequency deviation modal parameter design life jonswap...

.... rayleigh std frequency artificial intelligence acceleration response machine learning finite element model shear building stiffness matrix constraint bandwidth damage assessment bayesian inference modal parameter stiffness parameter natural frequency bayesian probabilistic approach...

... that by monitoring the response of the structure and utilizing Operational Modal Analysis (OMA) it is possible to indirectly identify loads, occurring in actual conditions. A method employing modal parameters to establish a response function, which is used to back-calculate the hydrodynamic wave loading...

... Abstract This paper attempts to identify weak modal parameters buried in highlevel noise, by using two sets of typical signals: one was collected from the JZ20–2MUQ, and the other was collected from the WZ11–4D platform. Results show that a rough pole window could be easily determined based...

... Abstract Extracting modal parameters of offshore structures under ambient excitation is crucial for the structural health monitoring. In this paper, a procedure combining Natural Excitation Technique (NExT) and Polyreference Complex Exponential (PRCE) method to identify modal parameters...

... behavior of the flexible hull at the natural frequencies of the hull. The damping identification of a vibrating structure, including other modal parameters such as the natural frequencies and mode shapes, has been a key research topic in many engineering fields and the two key techniques are deeply...

... Abstract As the measured data are inevitably contaminated by noise, accurately estimating modal parameters of a structure has been a difficult task. This article proposes a modal parameter estimation approach based on noise removal from measured data. In order to remove noise, a structured low...

... frequencies and mode shapes of a scaled model of floating structure. A modal testing is performed on the structure and modal parameters for the structure are extracted from the measured data. The results are compared to a finite element model of the floating structure and the correlation between the measured...

... and damping ratios from a measured response time series associated with a free vibration motion. Based on data synthesized from a sophisticated finite element model for a realistic offshore jacket-type platform, we demonstrate that the modal parameters estimated from the proposed method agree well with those...

... Celsius degree are investigated. The modal properties are identified from vibration tests of cantilever beams using Subspace-based System Identification (SSI) method. KEY WORDS: Vibration; Composite materials; Composite structures; Modal parameter identification; Finite element analysis; Damping...

... platform, for which pre- and post-damage modal parameters are available for a few lower modes of vibration, the feasibility of the algorithm is tested. Firstly, the validity of the new algorithm using changes in partial mode shapes and its robustness against identification error of baseline structure...

... identification is applied to extract the modal parameters of the pre-damaged and damaged structure. Modal strain energy index is employed to detect the damage(s). Results demonstrate that this damage detection method can detect the damage(s). INTRODUCTION Offshore platforms, which work in hostile environment...

.... Modal flexibilities are evaluated using noisy ‘measured’ modal parameters. The results show that the novelty index based on flexibility has a high sensitivity to damage and a good tolerance to the noise. In this technique, no structural model is needed. Only a few of low-order modal parameters...

... ABSTRACT While a significant effort has focused on the development of non-destructive damage detection and systems identification algorithms, the most promising work has evolved from those algorithms that utilize modal parameters as input. In addition, implementation of these techniques...

... in solving the problem. An experimental modal analysis has been used in the upgrading of a generalized procedure for modal parameter measurements of operating offshore structures. This procedure was partially validated in determining global performance of some platforms operating in the Vietnam shelf...

... detection offshore platform detection equation safety artificial intelligence reliability failure mode component failure probability probability system failure probability severity modal parameter baseline structure Proceedings of the Eighth (1998) international Offshore and Polar...

... by using four kinds of floating model which differ on stiffness of the connectors or mooring cables. EXPERIMENTAL MODAL ANALYSIS The experimental modal analysis is one of the practical methods of experimental vibration analysis to determine the modal parameters such as natural frequencies, natural mode...

... of an offshore jacket platform. Finally, the accuracy of damage localization and severity estimation results in the numerical example is assessed as a function of model uncertainties for the structure. KEY WORDS: Damage Detection, Modal Parameters, Offshore jacket Platforms, Model Uncertainty INTRODUCTION During...

... the Similitude Theory. An experimental modal analysis technique was applied to obtain their dynamic characteristics. It is shown that certain common types of joint damages in these structures can be identified by looking at changes of some modal parameters. INTRODUCTION Ever deeper waters in offshore oil...