Direct evaluation of the equivalent linear damping for TLCD systems in random vibration for pre-design purposes

Matteo, Alberto Di; Iacono, F.; Navarra, Giacomo; Pirrotta, Antonina

doi:10.1016/j.ijnonlinmec.2014.03.009

Cited by 57 publications

(30 citation statements)

References 30 publications

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“…Researchers have analysed the characteristic parameters of vibration suppression with TLCDs and formulated optimisation design methods for high-rise building [34][35][36]. None of research has referred to a solution for deep-sea floating platforms and the impact analysis of the characteristic parameters of TLCDs applied on deep-sea floating platforms.…”

Section: Sensitivity Analysismentioning

confidence: 99%

“…In this study, selection criteria of motion suppression systems on TLPs are proposed based on the analysis of its key parameters for a TLP. With the help of the calculation model and experimental design form [36,37], the numerical orthogonal test analysis has been performed with the seven factors listed in Table 1. Every level is chosen according to the experience in computation and the actual situation.…”

Section: Sensitivity Analysismentioning

confidence: 99%

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A New Energy-Absorbing Device for Motion Suppression in Deep-Sea Floating Platforms

Zeng¹,

Yu²,

Zhang³

et al. 2014

Energies

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Deep-sea floating platforms are one of the most important large structures for ocean energy exploitation. A new energy-absorbing device named S-shaped Tuned Liquid Column Damper (TLCD) has been invented for the suppression of the horizontal motion and vertical in-plane rotation of a deep-sea floating platform. A conventional tuned liquid column damper has a U-shaped water tunnel to absorb the excessive energy of the main structure. The application of U-shaped dampers in deep-sea floating platforms is difficult due to the restriction of a large horizontal length. A novel S-shaped damper is proposed to retain the same amount of liquid using a shorter S-shaped tunnel. Theoretical and experimental works are conducted and prove that an S-shaped damper needs less than half the horizontal length to provide the same suppression as a U-shaped damper. A coupling calculation model is proposed and followed by the sensitivity analysis. The study demonstrates the applicability of the novel S-shaped damper for the motion suppression in deep-sea floating platforms.

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Section: Sensitivity Analysismentioning

confidence: 99%

Section: Sensitivity Analysismentioning

confidence: 99%

A New Energy-Absorbing Device for Motion Suppression in Deep-Sea Floating Platforms

Zeng¹,

Yu²,

Zhang³

et al. 2014

Energies

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“…Specifically, following the analysis in [4,26], the expression for the equivalent damping ratio becomes…”

Section: Statistical Linearization Of Base-isolated Structure Equippementioning

confidence: 99%

“…As shown in [4], the application of Eq. (8) for design purposes is not straightforward since σẎ is still unknown and implicitly depends on the equivalent damping ratio ζ l .…”

Section: Statistical Linearization Of Base-isolated Structure Equippementioning

confidence: 99%

“…In this respect, in order to find a simplified straight relationship between the input PSD G 0 and the estimated value for ζ l , a closed-form solution in terms of steady-state response statistic σ 2 Y is proposed, as detailed in the following. This proposed procedure is based on the approach reported in [4,7], for TLCD-controlled systems, and here applied to deal with base-isolated TLCD hybrid-controlled SDOF structures, as those shown in Fig. 1c.…”

Section: Statistical Linearization Of Base-isolated Structure Equippementioning

confidence: 99%

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Optimal design of tuned liquid column dampers for seismic response control of base-isolated structures

et al. 2017

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In this paper, the use of a tuned liquid column damper (TLCD) as a cost-effective means to control the seismic response of a base-isolated structure is studied. A straightforward direct approach for the optimal design of such a device is proposed, considering a white noise model of the base excitation. On this base, a direct optimization procedure of the TLCD design parameters is performed and optimal design charts are presented as a ready-to-use practical design tool. Comparison with the optimal parameters obtained considering a classical iterative statistical linearization technique proves the reliability of the proposed approach. The performance of the base-isolated TLCD-controlled structure is examined and compared with that of the simple base-isolated one (without TLCD), using a set of 44 recorded ground motions as base excitation. Theoretical and numerical results show that the TLCD is rather effective in reducing the response of base-isolated structures under strong earthquakes. Therefore, considering its advantageous characteristics and its overall beneficial effects, TLCDs can be considered as practical and appealing means to control the seismic response of base-isolated structures.

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Optimal design of semiactive MR-TLCD for along-wind vibration control of horizontal axis wind turbine tower

Sarkar

Chakraborty

2017

Struct Control Health Monit

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Summary Present study aims to address the design of smart vibration control scheme for horizontal axis wind turbine tower using magneto‐rheological tuned liquid column damper. With this in view, a reduced order model of the blade‐tower system is used, considering centrifugal stiffening and gravitational effects that lead to time‐dependent dynamic stiffness matrix. Aerodynamic load on the blades is modeled using blade element momentum theory. Semiactive control law in linear quadratic regulator framework is developed to mitigate the along‐wind vibration of the tower. To implement the control law, multiblade coordinate transformation is adopted that converts the system matrices in the nonrotating framework to tackle its time dependency. The performance of the proposed control algorithm is demonstrated using numerical simulations with and without controller. Clipped optimality of the control force is imposed to keep the parameters of magneto‐rheological tuned liquid column damper in the feasible range. Finally, sensitivity analysis is carried out to demonstrate the performance envelope of the proposed control algorithm for different operational scenario. Results presented in this paper clearly demonstrate that the proposed algorithm can be employed for effective along‐wind vibration control of large HWAT tower.

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Direct evaluation of the equivalent linear damping for TLCD systems in random vibration for pre-design purposes

Cited by 57 publications

References 30 publications

A New Energy-Absorbing Device for Motion Suppression in Deep-Sea Floating Platforms

A New Energy-Absorbing Device for Motion Suppression in Deep-Sea Floating Platforms

Optimal design of tuned liquid column dampers for seismic response control of base-isolated structures

Optimal design of semiactive MR-TLCD for along-wind vibration control of horizontal axis wind turbine tower

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