... in six accelerations. The data has been successfully recorded over a long-term monitoring period of four years. international modal analysis conference mode shape brincker tidal height frequency fdd analysis proceedings window length vibration platform natural frequency close mode...

... ABSTRACT This paper presents the analysis of the modal frequencies and mode shapes of the Vestas four-rotor wind turbine using two operational modal analysis methods. The Frequency Domain Decomposition method is used for standstill analysis, and the Ibrahim Time Domain method is used...

... mode shapes are determined through the application of a FEM based structural model. The diffraction/radiation problem is solved using the boundary integral equation method. Focus is given on the flexible modes' generalized hydrodynamic forcing and responses, the spar's hydroelastic response...

... frequency case study separate system linear mode platform linear finite element model artificial intelligence ibrahim stick state jenkins element random decrement technique simulation mode shape identification signature bridge finite element model slip state ABSTRACT...

... with this for many years. offshore structure experiment upstream oil & gas operational modal analysis brincker identification spacial distribution mode shape modal parameter case study fe model wave loading estimation matrix loading wave height simulation load estimate load...

.... In this work, we aim to clarify the dynamics of a flexible cylinder that undergoes vortex-induced vibrations in a systematically designed experiment to see the effect of structural mode shape on the excitations. In the experiments, we test three bending dominated flexible cylinders and compare the results...

... In this paper, linear and frequency-domain hydroelastic analysis is performed for investigating the behavior of a free floating, annular and flexible plate. A dry mode superposition approach is utilized, where the flexible mode shapes are determined through the derivation of analytical expressions...

... instrumented to provide strain and acceleration responses in some feature sections along its length. A number of dynamical model tests showed that corresponding mode shapes in vertical and in horizontal were basically as the same. But the absolute values of the natural frequencies in vertical were all higher...

... suppression of offshore platform under earthquake loads; and the tuned-mass damper control scheme was compared with tuned-liquid damper and active mass damper control scheme. loading frequency liquid damper damper vibration control mode shape seismic loading jacket offshore platform platform...

... have multiple wind turbines as well as wave energy converters. Particularly, KRISO designed a conceptual offshore renewable energy platform that hosts 4 wind turbines at corners and a series of point-absorber type wave energy converters along each side. mode shape resonance hydroelastic...

... to better establish its representativeness in relation to the structural health monitoring (SHM) of the platform. This paper shows the results of the data processing provided by the monitoring system, employed to perform spectral analysis and dynamic identifications. The frequencies and the mode shape were...

... acceleration signals obtained from a sea testing were analyzed applying the proposed method. Modal frequencies and damping ratios as well as corresponding mode shapes identified from different segments of the whole response time history are in good agreement, which validates the proposed methodology...

... cylinder mode shape amplitude natural frequency simulation inline displacement matrix displacement vibration upstream oil & gas numerical result vortex-induced vibration multi-strip method 3UHGLFWLRQ RI UHVSRQVH IRU YRUWH[ LQGXFHG YLEUDWLRQV RI D IOH[LEOH ULVHU SLSH E\ XVLQJ PXOWL VWULS...

... Abstract This paper focuses on the experimental study of mode shape identification, using the residues of measured data. The residues can be obtained by analyzing multiple signals from the vibration testing. And mode shapes have a relationship with the residues through a coefficient matrix...

... connection system jumper hydrotest receiver structure mode shape viv fatigue analysis result site integration testing jumper fabrication upstream oil & gas template fabrication DESIGN AND INSTALLATION OF FLOWLINE JUMPER FOR SOUTH CHINA SEA APPLICATION Zhigang Li, Ning He, and Bo Wang China...

.... It relates fatigue life to the natural frequencies and mode shapes of the pipe, and assumes linear soil behaviour. However, soil is shown to behave nonlinear, which means the pipe may lift up from the bed. This can have severe consequences when investigating multi-spans. The experimental work done...

... boundary finite element method under zero external excitation and solutions of SBFEM equations are expressed in details, then the natural mode shapes of sloshing and their corresponding frequencies are can be obtained. The SBFEM needs discretize only the water surface and walls with curved surface finite...

... analysis was performed. Firstly, dynamic natural frequency analysis was carried out to generate structural dynamic characteristics including eigenvalues (natural frequencies), eigenvectors (mode shapes) and mass matrix. To adequately represent the dynamic characteristic of the structure, the number...

... multi-span section mode shape eigenfrequency free span stiffness modal analysis modal stress span midstream oil & gas seabed topography Effects of Seabed Topography on Modal Analyses of Free Spanning Pipelines Håvar A. Sollund (1) and Knut Vedeld (2) (1) Mechanics Division, Department...

... that incorporates active recovery mode shape information was investigated. Data recorded from an experiment investigating the flow-induced vibration of a smooth horizontally towed cylinder was used in the optimization process. In addition to the smooth cylinder case, the data of a cylinder covered with buoyancy...