... wind energy equilibrium position renewable energy irregular wave line force turbulent wind floating production system offshore projects planning and execution natural frequency statistical result semisubmersible offshore wind turbine semi-submersible platform wind turbine Performance...

... turbine (Madjid, 2014). preliminary design design parameter social responsibility wind load renewable energy natural frequency artificial intelligence displacement turbine sensitivity analysis offshore wind turbine maximum displacement foundation tripod foundation structural behavior...

... natural frequency of the liquid in the elastic tank slightly differs from that in the rigid tank of the same internal size. The model tanks are exited in 1-D harmonic longitudinal motion. Three relative fill levels ( h / L ) of 0.167, 0.333 and 0.500 are considered. The comparisons of the steady-state...

... channel penetration depth gas pipeline anchor risk and uncertainty assessment longgu channel natural frequency risk management offshore pipeline impact energy submarine pipeline ship probability risk assessment midstream oil & gas frequency aground ocean engineering cnpc research...

... in the simulation by the open source code. Several primary design load cases with different wave and wind condition are investigated. The natural frequency, damping ratio, the statistic and frequency domain responses of the system are included. KEY WORDS: offshore wind energy; turbulence intensity; floating...

... the costs, the overall weight of the wind turbine components is minimized, which means that the wind turbine support structures become more flexible and thus more sensitive to dynamic excitation. Since the first natural frequency of the offshore wind turbines is close to the excitation frequencies...

... are identified by experimental vibration analysis in air and water. The natural frequencies and mode shapes are compared in air and water to obtain hydro-elastic effects. Some interesting results are found in the variation of natural frequencies and damping ratios of the circular cylindrical shell for different...

... response of the long flexible risers, the in-line dynamic response has received little attentions so far due to its rather smaller oscillating amplitude (Søreide, 2002). dynamic response investigation long flexible riser natural frequency amplitude response frequency time history riser model...

... of 0-0.57m/s. The response of the model was measured using fiber optic strain gauges. The frequency responses and the time-domain tracing of cross-flow strain responses are presented and analyzed. The experimental results exhibit several valuable features: the natural frequency of the model has a fuzzy...

... the internal flow speed, the lower the natural frequency of the marine risers. Chen and Lin (1989) compared the dynamic responses of marine risers to harmonic wave and linear hydrodynamic drag forces using Newmark intergration and Fourier Expansion methods. The results were in good agreement. Wu and Lou (1991...

... to find the nonlinear static configuration and large static strain. The natural frequencies and mode shapes are calculated by using the assumed-modes finite element method. The pipes/risers perform tensioned beam behavior when the bending stiffness dominates, and the stability of the pipes/risers reduces...

.../pipes can cause excessive stress and strain responses, leading to ultimate fatigue failure of the riser system. To avoid a resonance resulting in the sustainable use of the riser, the study to evaluate the influence of end rotational stiffness on the natural frequency of a marine riser conveying fluid...

... to the platform's natural frequency varies in [0.5, 1.5]. The theory analysis shows that: the platform has the better vibration control effect when the nondimensional frequency bandwidth, which is defined as the ratio of the frequency range to the controlled platforms natural frequency, is in [0.35, 0.6...

... vibration dynamic ice force experimental study ice force flexible conical structure yunliang zhang natural frequency cone ice-induced vibration ice sheet Experimental Study on Ice-Induced Vibration of Flexible Conical Structure Yunliang Zhang, Peng Lu, Zhijun Li, Yongxue Wang, Guangwei Li, Gao...

... ABSTRACT: Model test experiments were conducted in towing tank to measure and analyze the resonance ranges due to flow induced oscillations for circular shaped moonpool. Data analysis was conducted using ‘Empirical Mode Decomposition Method’. The natural frequency of water governs the water...

... limitation simulation substructure hull platform earthquake natural frequency stability substructure Ice-Resistant Semi-Floating Platform Substructure for Sakhalin Shelf Seismic Area for Sea Depth up to 160m S. Karlinsky, M. Makarov, O. Mokhov Central Design Bureau for Marine Engineering «Rubin...

... characteristics induced by varia- tion of the form and varIation of water depths, assuming that the H.P. body is rigid. The hydrodynamic load characteristics by earthquakes in the same conditions as above. Added mass analysis which depends on vibra- tional mode shapes, and natural frequency analysis on coupled...

... on the natural frequencies is discussed by using a probabilistic sensitivity analysis method. Finally, the applicability of the proposed methods is demonstrated through the numerical example for a 450m guyed tower. INTRODUCTION In this paper, a method is presented for the probabilistic analysis on the quasi...

... at the upper end finally, in order to investigate the fluid nonlinear effects, the forced oscillation test in water was performed. hydrodynamic coefficient upstream oil & gas deflection cylinder frequency component amplitude frequency response map natural frequency diameter riser exciting...