... simulation cylinder experiment vibration fluid mech cross-flow direction numerical simulation coefficient circular cylinder vortex evolution kc 6 time series oscillatory flow vortex displacement numerical investigation cylinder motion regime upstream oil & gas...

... 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...

... experiment viv frequency isope cylinder response frequency pipe model circular cylinder vibration submarine pipeline span offshore pipeline pipeline span span natural frequency vortex-induced vibration pipe flow velocity sand case diameter Experimental Study on VIV...

... 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...

... that approximate damage location be known as a priori. Because of those disadvantages mentioned above, vibration based global damage detection has received many researchers close attention (Doebling et. al., 1996). It is well known that damage would alter the stiffness, damping or mass of the structure, and so...

... 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...

... Dynamic Response Analysis of Natural Gas Pipeline System Exposure to Ice-induced Vibration on Offshore Platform Qianjin Yue, Dayong Zhang, Gang Li and Qing Zhou State Key Laboratory of Structural Analysis of Industrial Equipment, Dalian University of Technology Dalian, China ABSTRACT Sea ice can...

... the flexural strength of the ice is lower than the ice crushing strength. However, for slender steel structures both the ice crushing and bending failure may lead to ice induced vibration of the structure. Several theories have been proposed to predict these vibrations, but the physically details...

... 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...

... 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...

... Abstract: Experiments on vortex-induced vibration suppression devices were carried out at a canal. Helical wire type and flag type suppression devices were attached to a cable 17.45 meters in length and 28.6 millimeters in diameter. The effectiveness of the suppression devices was measured...

... ABSTRACT: The free bending vibrations of fixed off shore cylindrical structures partially or totally submerged in water are discussed. This investigation is necessary for the dynamic response analysis of offshore structures under wave or earthquake loadings. A general solution of the small...