Nonlinear modeling and validation of air spring effects in a sealed tuned liquid column damper for structural control

Bhattacharyya, Soumi; Ghosh, Aparna; Basu, Biswajit

doi:10.1016/j.jsv.2017.07.046

Cited by 33 publications

(20 citation statements)

References 37 publications

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“…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. Bhattacharyya et al (2017) verify that the pressurized chamber stiffness of the Pressurized Tunned Liquid Column Damper (PTLCD), despite having non-linear behavior, can be expressed by an equivalent linear value for vibration control analysis. However, it is emphasized that by assuming the rigidity of pressurized gas as linear springs, the reduction of the dynamic response of the structure can be slightly overestimated.…”

Section: Introductionmentioning

confidence: 83%

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.

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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.

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Section: Introductionmentioning

confidence: 83%

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.

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“…The theoretical relationship between ω n and P n is given by Equation , where most of the parameters can be precisely determined. Nevertheless, the adiabatic index for a polytrophic process is defined in the general range: 1 < η < 1.4.…”

Section: Dampermentioning

confidence: 99%

“…Nevertheless, the adiabatic index for a polytrophic process is defined in the general range: 1 < η < 1.4. 15,25,26 Figure 8 shows the band of the square value of the theoretical natural frequency, where the lines related with minimum and maximum adiabatic indexes are highlighted. In addition, the experimental natural frequencies are shown in function of the nominal pressure, P n , using boxplots and, as it can be observed, the experimental natural frequencies tend to be slightly larger than the theoretical values.…”

Section: Ptlcd Configurationmentioning

confidence: 99%

Structural control of a grandstand using a semi‐active pressurized tuned liquid column damper considering effects of passive crowds

Riascos

Marulanda

Thomson

2019

Struct Control Health Monit

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Summary Varying passive crowds can cause considerable changes in the dynamic properties of civil structures, such as sport venues. The effectiveness of passive control systems for the reduction of vibrations in these structures is limited as the dynamic properties of the structure change depending on the occupancy level and postures. Hence, a semi‐active system is proposed for reducing structural vibrations regardless of the off‐tuning due to passive crowd effects. This paper describes the experimental implementation of a semi‐active control strategy for a pressurized tuned liquid column damper (PTLCD) on a grandstand‐type steel structure. Additionally, an analytical model is proposed for the human–structure–damper system, and numerical results are compared with those obtained experimentally. Only the effects of passive anthropic behavior were considered, and results show that individuals, when sitting, produce more damping in the main structure than when they are standing. Overall, the semi‐active PTLCD had a satisfactory performance for the different configurations considered, achieving reductions in peak and root mean square acceleration of up to 74% and 57% with respect to the grandstand without the control system.

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“…In addition, the performance of the STLCD to attenuate the torsional vibration of asymmetric structures was studied [22]. Bhattacharyya et al [23] performed an experimental study on to the influence of the air spring nonlinearity on to the air pressure-volume relationship inside the STLCD. Thereby, the total length and the cross-sectional area ratio are the only two parameters, which can be used for tuning the traditional TLCVAs.…”

Section: Introductionmentioning

confidence: 99%

Study on the Dynamic Performance of a Modified Tuned Liquid Column Damper

Younes

2019

Engineering Research Journal

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The main objective of the present study is to reduce unwanted vibrations of mechanical systems through a sealed tuned liquid column damper (STLCD). A nonlinear mathematical model including nonlinear damping and air stiffness of the STLCD is considered to study the dynamic behaviour of a structure-STLCD coupled system. A parametric study to investigate the influence of the main parameters of the STLCD such as length ratio and mass ratio on the dynamic behaviour of the main system subjected to ground excitation is presented. The air volume at rest is considered as an additional design parameter. The study showed that the efficiency and the range of application of the STLCD to control the system resonance vibration are better than the traditional one. In addition, it has been noticed that the gain in vibration mitigation from the STLCD with a bigger mass higher than 7% ratio is generally modest. Also the same trend is observed when increasing its horizontal length ratio over 0.8. These enhance the actual implementation of the STLCD for small horizontal space applications. Equations for the optimum value of the initial air column height ratio and its corresponding performance index for the main structure-STLCD system as a function of both mass ratio and relative length were proposed.

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Nonlinear modeling and validation of air spring effects in a sealed tuned liquid column damper for structural control

Cited by 33 publications

References 37 publications

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

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

Structural control of a grandstand using a semi‐active pressurized tuned liquid column damper considering effects of passive crowds

Study on the Dynamic Performance of a Modified Tuned Liquid Column Damper

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