... ABSTRACT Sinusoidal motion of a cylinder in viscous flow has been extensively studied in the past decades. Distinction of flow patterns exists between cylinders in cross-flow freedom restricted and freely vibrating conditions when experiencing oscillatory flow. In this paper, a series...

... by vortex-induced vibration (VIV) when the reduced velocity is smaller than the critical reduced velocity and by galloping when the reduced velocity is larger than the critical reduced velocity. When the spacing ratio is 3.5, only VIV occurs for V r is less than 20 while a response with combination...

... waterstop concrete cast leakage effectiveness vibration deformation tunnel Improving the effectiveness of the injectable waterstop used for the segmented joint of immersed tunnel Ming Lin1, Wei Lin1, Joel Van Stee2, Xiaopeng Peng1 1. CCCC HZMB Island and Tunnel Project General Office, 2...

... ABSTRACT In this paper, a circular cylinder attached by a pair of fin-shaped strips is proposed with intent to harvest hydrokinetic energy. It is found via numerical simulations of fluid-structure interaction that vortex-induced vibration and galloping occur back-to-back by placing the strips...

... as the representative dimension of the system to calculate the reduced velocity, the lock-in regime is narrower that of a single cylinder. Introduction Vortex-induced vibration of a circular cylinder has been studied extensively due to its engineering significance. It is well known that the vortex shedding frequency...

... the structure-borne noise by pile & tower vibration is dominant Fig. 1 Noise radiation characteristics in offshore wind turbine in underwater region where the pile & tower vibration are transferred from the gearbox (gear transmission error) and generator vibrations. That is, the air-borne noise is predominant...

... 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...

... ABSTRACT: Although there are many studies dedicated to the problem of vortexinduced vibration (VIV) of submarine pipeline spans, VIV experiments considering the effect of soil at the span shoulders are very rare. To investigate the effect of the soil on the VIV of submarine pipeline spans...

... but in many cases their rotational stiffness is hardly set free for the hinge connection. This paper integrates the analytical investigation and the design consideration for the effects of end supports on the free vibrations of a marine riser conveying fluid. It is well known that resonances of marine risers...

... ABSTRACT: This paper presents a new theoretical model capable of predicting the vortex-induced vibration response of a steel catenary riser subject to a steady uniform current. The equations governing riser in-plane/out-ofplane (cross-flow/in-line) motion are based on a pinned beam-cable model...

... ABSTRACT: ANSYS multi-physics software was applied to a Fluid-Structure Interaction (FSI) task, a large-scale riser with vortex-induced vibration (VIV) undergoing shear inflow environment. The purpose of this paper is to evaluate the performance of the FSI software and to provide the model...

... unrealistic. Other Non-Destructive Testing (NDT) techniques, like ultrasonic, radiograph, etc., are usual ways to inspect the potential damages. Because of those disadvantages mentioned above, vibration based global damage detection has received many researchers' close attention (Doebling et. al ., 1996...

... ABSTRACT: Physical model tests are conducted to simulate ice-induced vibration of flexible structures by using a new non-frozen breakable synthetic material. Responses of the structure, including acceleration, displacement and strain, are recorded as ice sheet acting on the structure...

... by Suzuki, H. et al (1993,1995,1997). controller marine riser ida-pbc method vibration matrix reentry operation nonlinear controller equation artificial intelligence riser control method control input stabilization lower end mathematical model mechanical system unit length...

... ABSTRACT: Sea ice can induce the offshore jacket structure to vibrate in Bohai Sea. Ice-induced vibrations of offshore structure could lead to the associated accidents of pipeline on the platform. Based on the data observed on the platforms of JZ202 in Bohai Sea, the typical history curve...

.... bohai bay ice thickness thickness steel structure drilling operation vibration platform leg cone drilling equipment different code offshore mech loading rate upstream oil & gas frequency amplitude platform strength th international conf arct eng ice load reservoir...

... response amplitude of vortex-induced vibration is induced at the bottom part of the model for all excitation frequencies and amplitudes. A numerical simulation method for dynamics of vertical risers is developed. The equations of motion of riser are derived based on Hamilton's principle. Galerkin method...

... axial stress metals & mining frequency chung displacement higher drag force fluid force pipe cross-sectional area maximum axial stress upstream oil & gas vibration longitudinal displacement equation sea surface coefficient added-mass coefficient amplitude mass...

... ABSTRACT: This paper deals with the probabilistic analysis on the quasi-static strength and the natural vibration of composite and slender offshore structures for deep water, which are treated as a simple tower model by replacing its tower frameworks and platform with the beam-columns...

... structure vibrations. Under certain conditions this phenomenon may give rise to the considerable inertial forces which are ignored now in the offshore structure analysis (Code, 1983) or to the structure fatigue resistance. The governing equations to describe the time-dependent ice force behavior...