Research on damping isolation to reduce vibration and effectiveness analysis of vibration control for steel offshore platform

Using the band gap properties of the periodic structure, the truss structure of an offshore platform is designed as a one-dimensional periodic conduit structure, and the band gap characteristics are used to realize the vibration control of the truss structure of the offshore platform. The finite element method is used to simulate the vibration characteristics of the periodic conduit, and the influence of the structural parameters (length and wall thickness) of the periodic conduit on the vibration band gap of the periodic conduit is analysed. The frequency response characteristics of the periodic truss structure of an ocean platform are calculated and compared with those of a traditional truss structure. The results show that the periodic truss exhibits better suppression of vibration transmission than the traditional truss, especially for the vibration in the band gap, which is greatly attenuated. This study shows that the periodic structure has broad application prospects in vibration isolation design of truss structures for offshore platforms. The research provides a new technical approach for vibration control of truss structures on offshore platforms.

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Vibration Control of Offshore Platform Structure with Friction Dampers

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.638-640.318 ◽

2014 ◽

Vol 638-640 ◽

pp. 318-321

Author(s):

Da Hai Zhao ◽

Jing Lin Zhang

Keyword(s):

Energy Dissipation ◽

Vibration Control ◽

Equation Of Motion ◽

Offshore Platform ◽

Wave Loads ◽

Friction Damper ◽

Friction Dampers ◽

Offshore Platform Structure ◽

Better Than

The performance of friction dampers to mitigate waves and earthquakes in tower-type offshore platform is investigated in this paper. Taking the offshore platform of TOWER-1 as an example, the equation of motion of offshore platform structure under earthquake and wave loads was established. The response reductions of offshore platform structure by different peak earthquakes were analyzed. The results show that the responses of the tower-type offshore platform structure under wave and earthquake could be effectively reduced by friction damper, and the energy dissipation ability of the friction damper differs in the different floors. The friction dampers give good response reductions in different peak earthquakes, and the response reductions of displacement are better than those of acceleration.

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Research on smart control tests of ice-induced vibration control of offshore platform

2010 International Conference on Intelligent Control and Information Processing ◽

10.1109/icicip.2010.5565298 ◽

2010 ◽

Author(s):

Jigang Zhang ◽

Bin Wu

Keyword(s):

Vibration Control ◽

Offshore Platform ◽

Smart Control ◽

Ice Induced Vibration

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Seismic Performance and Ice-Induced Vibration Control of Offshore Platform Structures Based on the ISO-PFD-SMA Brace System

Advances in Materials Science and Engineering ◽

10.1155/2017/3596094 ◽

2017 ◽

Vol 2017 ◽

pp. 1-15

Author(s):

Jigang Zhang ◽

Zhehao Ma ◽

Feifei Liu ◽

Chunwei Zhang ◽

Pezhman Sharafi ◽

...

Keyword(s):

Energy Dissipation ◽

Shape Memory Alloy ◽

Vibration Control ◽

Seismic Response ◽

Seismic Performance ◽

Offshore Platform ◽

Hysteretic Behavior ◽

Induced Response ◽

Isolation Layer ◽

Structural Configurations

Pall-typed frictional damper (PFD) has higher capacity of energy dissipation, whereas shape memory alloy (SMA) has excellent superelastic performance. Therefore, combining PFD and SMA together as a brace system has a great prospect in vibration control of structures. This paper investigates the performance of offshore platform with three structural configurations including the SMA brace system, the ISO-SMA (where ISO stands for isolation) brace system, and the ISO-PFD-SMA brace system, which are subjected to seismic and ice-induced excitations. In this study, PFD-SMA brace system is installed on the isolation layer of jacket platform, which is under earthquake excitations and ice loading. Then, the reduction of vibration is evaluated by using ANSYS program. The results show that the PFD-SMA brace system is useful in reducing the seismic response and ice-induced response of offshore platform structures; meanwhile, it also demonstrates excellent energy dissipation and hysteretic behavior.

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Vibration Control of Offshore Platform Based on Outrigger Damping System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.351-352.1112 ◽

2013 ◽

Vol 351-352 ◽

pp. 1112-1116 ◽

Cited By ~ 1

Author(s):

Yu Hong Sun ◽

Qun Niu ◽

Li Wu Nie ◽

Ji Gang Zhang

Keyword(s):

Finite Element ◽

Vibration Control ◽

Simulation Analysis ◽

Influencing Factor ◽

Great Influence ◽

Offshore Platform ◽

Acceleration Response ◽

Finite Element Software ◽

Damping Effect ◽

Ice Load

Outrigger damping system is used in JZ20-2 north high wellhead platform, making simulation analysis to the whole structure subjected to pushing ice load by finite element software ANSYS, calculating displacement and acceleration response under different length of horizontal pole and different height of damper. The height of the damper has great influence on displacement and acceleration. The damping effect of horizontal bar length has an impact on the damping system, and the main influencing factor is the damper height, and when the height is H2 the damping effect is the most ideal.

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