Assessment of Semi-Active Tunes Mass Damper Application in Suppressing Seismic-Induced Vibration of an Existing Jacket Platform

Babaei, Samira; Amirabadi, Roohollah; Taghikhany, Touraj

doi:10.18869/acadpub.ijmt.6.1

Cited by 10 publications

(5 citation statements)

References 12 publications

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“…Semi-active control scheme [15,16] is an excellent approach for the vibration control as these controllers utilized the benefits of both passive and active control system. The major control algorithms, clipped optimal control algorithm [14], Bang-Bang control algorithm [17], LQG algorithm [30], linear quadratic control algorithm [18] and non-resonance control algorithm [19], are used for implementation of semi-active control schemes.…”

Section: Introductionmentioning

confidence: 99%

Semi-active Seismic Vibration Control Offshore Jacket Platforms

Khan

Das

2021

Lecture Notes in Civil Engineering

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A semi-active control scheme for the vibration control of offshore steel jacket platforms is developed. Decentralized sliding mode control (SMC) algorithm is adopted for applying the control force to the structure with the help of Magnetorheological (MR) damper for alleviating the earthquake-induced vibrations. SMC method is used due to its robustness against the parametric variations of the structures. The command voltage to the MR dampers is regulated through the clipped-optimal algorithm. A steel jacket platform, available in the literature, is modelled in MATLAB as an example to investigate the dynamic responses under the environmental loads. The earthquakes ground motions, scaled to 0.3 g PGA, considered in the present study are the El Centro (1940), Northridge (1994), San Fernando (1971) and Chichi (1999. Results indicate that sliding mode controller is able to reduce the responses of the offshore jacket platform significantly, subjected to different earthquake loads. It is observed that the positions and the number of MR dampers affect the performance of the controller to a great extend in the offshore jacket platforms. The control algorithm is stable against the variations and uncertainties in structural parameters.

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Section: Introductionmentioning

confidence: 99%

Semi-active Seismic Vibration Control Offshore Jacket Platforms

Khan

Das

2021

Lecture Notes in Civil Engineering

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“…Usually, the structural stabilization systems are either mounted on or embedded inside the main structure. This type of Tuned Mass Dampers (TMD) are designed to mechanically damp the vibration either passively, actively or even semi-actively [14][15][16][17]. The efficiency of these systems is associated with their mass, stiffness and damping coefficient.…”

Section: Introductionmentioning

confidence: 99%

“…These approaches are often costly, energy-consuming and complicated [6,12]. Moreover, in previous works the proposed TMD stabilization mechanisms are either mounted on or embedded inside the main structure and have no contact with the surrounding water [14][15][16][17]. The proposed system in this study, however, provides a stabilized buoy, as a result of which, the sensors mounted on it might no longer require individual mechanical stabilization systems.…”

Section: Introductionmentioning

confidence: 99%

Design, assessment and evaluation of structural stabilization system for weather buoys using a moving foil

2020

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This paper proposes a novel, simple and high-efficient submerged structural stabilization system for a self-stabilizing buoy that provides a stable platform for oceanographic and meteorological sensors. The proposed stabilization system is a Seesaw-like Tuned Mass Damper (STMD) combined with a foil and is designed in a way to harvest the activation energy from incoming waves. A fixed rudder in the rear underside of the buoy, as well as physical properties of the buoy, help to keep its balance in yaw and roll directions while encountering lateral waves. Therefore, the orientational stabilization of the whole structure is achieved by controlling only the pitch deviation. The proposed model is then simulated in a marine dynamic analysis software. Two different shapes of a thin rod and a foil were proposed for the sliding mass (slider) of the STMD and their performances are investigated and compared to each other in two different modes of passive and active control. In the passive mode, different mass ratios were conducted for the thin rod-shaped slider (i.e., a ratio of the effective mass of the stabilizing system to that of the whole structure) and a mass ratio of 8% could suppress the pitch deviation up to 81.3% in the resonance condition. The same STMD system with a mass ratio of 2% suppresses the pitch deviation by only 7%. In the active mode, the STMD with a thin rod-shaped slider and a mass ratio of 8% exhibits only 49.1% suppression effect in a multiwave condition. However, by changing the shape of the slider to a foil while controlling its angle of attack (AOA) mechanically, the system with the mass ratios of 2% and 8% could suppress the pitch deviation of the buoy up to 69.4% and 79.1%, respectively.

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“…The results showed that MR dampers efficiently help in reducing displacement & acceleration. From the results of time history analysis of the deck platform with Semi Active Tuned Damper reported in the literature [4] showed that Semi Active Tuned Damper can dramatically reduce the acceleration and displacement of the platform. The nonlinear response of a fixed deck platform has been studied under wave loading [5] and it was found that it is crucial to decrease the overall response of an offshore structure subjected to environment loads.…”

Section: Introductionmentioning

confidence: 99%

Seismic Behaviour of Offshore Steel Jacket Platform Braced in Horizontal and Vertical Planes

Ahmed*¹,

Kumar²

2019

IJITEE

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The offshore jacket platforms are primarily installed in the large oceans mainly for drilling the crude oil, carbohydrates and production of electricity. The current studies emphasize on the structural performance of offshore deck jacket platform with different bracing systems. Earthquake analysis has been performed to calculate the seismic responses, with the help of bracings to control the seismic induced vibrations of the jacket platforms. For this study, a jacket platform made up of steel members has been modeled and then analyzed under earthquake and wave loadings. This paper mainly deals to compute and compare the seismic behavior of offshore steel deck platform using SAP 2000 v20 software with bracing in the horizontal plane and bracing in both horizontal and vertical planes. The total number of 8 models has been analyzed in the SAP2000 software with bracing i.e. X, V, Inverted V and K in the vertical plane and bracing i.e. X, V, Inverted V and K in both horizontal and vertical plane. A relative study has been carried out in Time period, deck displacement and base shear. Seismic analysis using linear static, i.e. Equivalent static method (ESA) and linear dynamic, i.e. Response spectrum method (RSA) has been performed. Further deck displacement, time period and base shear are determined by Equivalent static method and Response spectrum method for various types of bracing models in both horizontal and vertical planes. Among the all various types of bracing models, Inverted V bracing in the vertical plane is found to be the optimum model among all other models.

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Assessment of Semi-Active Tunes Mass Damper Application in Suppressing Seismic-Induced Vibration of an Existing Jacket Platform

Cited by 10 publications

References 12 publications

Semi-active Seismic Vibration Control Offshore Jacket Platforms

Semi-active Seismic Vibration Control Offshore Jacket Platforms

Design, assessment and evaluation of structural stabilization system for weather buoys using a moving foil

Seismic Behaviour of Offshore Steel Jacket Platform Braced in Horizontal and Vertical Planes

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