Suppressing structural vibration of a jacket-type platform employing a novel Magneto-Rheological Tuned Liquid Column Gas Damper (MR-TLCGD)

Hokmabady, Hamid; Mohammadyzadeh, Samira; Mojtahedi, Alireza

doi:10.1016/j.oceaneng.2019.03.055

Cited by 35 publications

(7 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Also the conventional TLCD is modified to the tuned liquid column gas damper (TLCGD) and used for seismic induced vibration reduction of offshore jacket platform [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

MR Tuned Liquid Colum Damper (MR-TLCD) for Seismic Vibration Control

Roychowdhury

Gur

2022

ASPS Conf. Proc.

View full text Add to dashboard Cite

Seismic vibration control of flexible structure is an important aspect which mostly involves reduction of structure displacement via application of passive damper or mass dampers. Present study focuses on the seismic vibration control of flexible structure against random earthquake, through modified (using MR fluid) tuned liquid column damper (TLCD), known as the MR-TLCD. To this end, stochastic structural response analysis has been performed and results (structure displacement ratio and liquid displacement) are compared with conventional the TLCD. To establish the superior control efficiency of MR-TLCD over conventional TLCD, parametric study has been performed considering wide range of damper, structure, and earthquake loading parameters. Study results shows the existence of optimal value of tuning ratio, head loss coefficient, and yield shear strength of MR fluid of MR-TLCD which minimizes the structure displacement ratio, i.e. maximizes the control efficiency. Another important observation is that, for similar level of control efficiency MR-TLCD requires much less value of mass ratio than that of TLCD, and also at same time it keeps the liquid displacement much less compared to the TLCD, for same value of mass ratio. This aspect increases the applicability of MR-TLCD over TLCD for vibration control of the flexible structure. In comparison to the TLCD, MR-TLCD provides 17 % to 43 % higher structural displacement control efficiency and reduces liquid displacement by 14 % to 45 %.

show abstract

“…Also the conventional TLCD is modified to the tuned liquid column gas damper (TLCGD) and used for seismic induced vibration reduction of offshore jacket platform [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

MR Tuned Liquid Colum Damper (MR-TLCD) for Seismic Vibration Control

Roychowdhury

Gur

2022

ASPS Conf. Proc.

View full text Add to dashboard Cite

show abstract

“…Hochrainer also examined the active control of TLCGDs and found an improvement in the performance of the passive dampers by adding a source of pressurized gas controlled by automated valves during excitation. Tuned liquid column gas dampers have been extensively utilized in cable-stayed bridges, turbines, and platforms (Coudurier et al, 2018; Hokmabady et al, 2019; Shum et al, 2008; Ziegler and Amiri, 2013). An inerter, a mechanical device, has been recently considered to generate a resisting force proportional to the relative acceleration of its two terminals.…”

Section: Introductionmentioning

confidence: 99%

Adaptive control of damaged structures by using smart tunable liquid column gas damper considering dynamic soil–structure interaction

Amini

Shahri

2021

Advances in Structural Engineering

View full text Add to dashboard Cite

Liquid column dampers are adjusted based on the characteristics of the host structure and the type of external forces. It is assumed in most studies that the structure is rigidly connected to the ground, and the characteristics of the structure are invariant during external excitations. The performance of passive dampers may lose, or structural displacements may be increased by changing these conditions. This study presented a new method to find the optimal control forces for structures equipped with smart tuned liquid column gas damper (TLCGDs), considering variable characteristics of the structure and the soil–structure interaction. The proposed method calculates the gas pressure inside the columns by regularly adjusting and updating the frequency and damping of the TLCGD. The unknown or changed soil–structure characteristics are estimated by a system identification method, and damper parameters are determined through an optimization algorithm. The method was tested on 3- 9- and 10-story shear buildings under harmonic and earthquake excitation. According to the results, the smart damper more effectively reduced the structural displacement.

show abstract

“…The presence of the pressurized chambers allows calibration and tuning of the devices at the desired frequencies, with less effort since it is not only dependent on its dimension but also the gas pressure. Hokmabady et al (2019) studied the structural vibration control of an offshore platform using a hybrid liquid column gas and magneto-rheological damper system. They confirm that the gas pressure is of great importance, which results in a better performance of the whole system, mainly due to limitations of the liquid movement.…”

Section: Introductionmentioning

confidence: 99%

Effects of soil-structure interaction in seismic analysis of buildings with multiple pressurized tuned liquid column dampers

Mendes

Ribeiro

Pedroso

2019

Lat. Am. j. solids struct.

View full text Add to dashboard Cite

In this paper soil-structure interaction (SSI) effects are investigated while an array of Pressurized Tuned Liquid Column Dampers (PTLCD) is employed for seismic vibration control of buildings. This device represents the most general case of a passive damper, with different reduction options to other control devices obtained by simplifying the involved parameters. Soil conditions considerably affect the control device functioning, because dynamic parameters such as natural frequency, damping factor, and natural modes depend on the soil properties. A simplified mathematical model is developed for the building with multiple degrees of freedom connected to a flexible base. For the time-domain analysis, a computational routine is developed for the linearization of the equilibrium equations of the PTLCD, as well as details for the reduction to the other types of passive dampers. Several numerical examples are selected for the analysis of the damper efficiency in reducing seismic vibration considering SSI. These simulations include Kobe earthquake data, which is applied to the model to evaluate the device performance under different scenarios. It is verified the influence of SSI in the natural frequency and structural response, which is related to the earthquake frequency components. Results confirm that the array of PTLCD's can reduce the vibration amplitudes, being more effective for soils with higher stiffness values.

show abstract

Suppressing structural vibration of a jacket-type platform employing a novel Magneto-Rheological Tuned Liquid Column Gas Damper (MR-TLCGD)

Cited by 35 publications

References 15 publications

MR Tuned Liquid Colum Damper (MR-TLCD) for Seismic Vibration Control

MR Tuned Liquid Colum Damper (MR-TLCD) for Seismic Vibration Control

Adaptive control of damaged structures by using smart tunable liquid column gas damper considering dynamic soil–structure interaction

Effects of soil-structure interaction in seismic analysis of buildings with multiple pressurized tuned liquid column dampers

Contact Info

Product

Resources

About