A comparative study on optimization of multiple essentially nonlinear isolators attached to a pipe conveying fluid

Khazaee, Mostafa; Khadem, S.E.; Moslemi, Amin; Abdollahi, Ali

doi:10.1016/j.ymssp.2019.106442

Cited by 56 publications

(7 citation statements)

References 30 publications

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“…Kong et al [36] and Zhang et al [37] emphasized that two NESs in series could generate extra strongly modulated responses by adjusting the mass distribution. Khazaee et al [38] investigated the stochastic optimization of multiple NESs configured in parallel and series attached to a pipe conveying fluid. They found that the optimally designed parallel and series NESs could perform with high efficiency, and there was no substantial difference between the performances of the optimal parallel and series NESs.…”

Section: Introductionmentioning

confidence: 99%

NES cell

Ding

Shao

2022

Appl. Math. Mech.-Engl. Ed.

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A broadband adaptive vibration control strategy with high reliability and flexible versatility is proposed. The high vibration damping performance of nonlinear energy sink (NES) has attracted attention. However, targeted energy transfer may cause severe vibration of NES. Besides, it is difficult to realize pure nonlinear stiffness without the linear part. As a result, the reliability of NES is not high. The low reliability of NES has hindered its application in engineering. In addition, the performance of NES depends on its mass ratio of the primary system, and NES lacks versatility for different vibration systems. Therefore, this paper proposes the concept of NES cell. The advantages of the adaptive vibration control of NES are applied to cellular NES. By applying a large number of NES cells in parallel, the reliability of NES and its versatility to complex vibration structures are improved. An elastic beam is used as the primary vibration structure, and a limited NES is used as the cell. The relationship between the vibration suppression effect of NES cells and the number of NES cell is studied. In addition, the effect of the distribution of NES cells on the multi-mode resonance suppression of the beam is also studied. In summary, the mode of the primary structure can be efficiently controlled by a large number of lightweight NES cell. Therefore, the lightweight NES cell is flexible for vibration control of complex structures. In addition, it improves the reliability of NES applications. Therefore, the distributed application of NES cells proposed in this paper is a valuable vibration suppression strategy.

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Section: Introductionmentioning

confidence: 99%

NES cell

Ding

Shao

2022

Appl. Math. Mech.-Engl. Ed.

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“…The design and optimization of NES constitute a very dynamic field of research. Recently, a lot of work has for example been produced concerning the study of new configurations and technologies allowing/enhancing TET (Tian et al (2021); Xiong et al (2021)), the analysis of the underlying dynamics of the coupled system (Bergeot (2021); Habib and Romeo (2021); Bergeot et al (2020)), the deterministic optimization of NES (Geng et al (2021); Khazaee et al (2019)), the stochastic optimization of NES Pidaparthi andMissoum (2018, 2019), the coupling of the NES to an energy harvester (Fang et al (2021); Karama et al (2021); Karličić et al (2021)) or the use of a NES as an energy harvester (Zhou et al (2014); Li and Li (2021)), etc. Among the many research subfields about NES, the present work takes place within the framework of robust optimization of NES when the latter have uncertain parameters and are used to mitigate Limit Cycle Oscillations (LCO).…”

Section: Introductionmentioning

confidence: 99%

“…An optimization algorithm based on the Support Vector Machine (SVM) technique and a kriging meta-model have been used to predict this discontinuity according to the dispersion of some uncertain parameters. Khazaee et al (2019) studied the stochastic optimization of multiple NES (configured in parallel and in series) attached to a simply supported pipe conveying fluid. The results show that the optima obtained from stochastic optimization are much more robust than those obtained from deterministic optimization.…”

Section: Introductionmentioning

confidence: 99%

Robust optimization of nonlinear energy sinks used for mitigation of friction-induced limit cycle oscillations

Snoun

Bergeot²,

Berger³

2022

European Journal of Mechanics - A/Solids

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“…Concerning the mitigation of flow-induced vibrations, NESs were able to delay the flutter instability of wings (Tian et al, 2019;Amar et al, 2016) and mitigate the oscillations of pipes conveying fluid (Khazaee et al, 2020). NESs of various designs have been implemented in many structures to reduce the impact of flow-induced vibrations.…”

Section: Introductionmentioning

confidence: 99%

How a ball free to orbit in a circular track mitigates the galloping of a square prism

Selwanis

Franzini²,

Béguin³

et al. 2022

Nonlinear Dyn

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Transverse galloping is a type of flow-induced vibration (FIV) that leads to critical design considerations for engineering structures. A purely nonlinear energy sink (NES) composed of a ball free to rotate in a circular track experimentally mitigated the galloping of a square in a previous study. The current study introduces a model for simulating the dynamics of the square prism coupled with a ball-in-track (BIT) NES and predicting the system behaviour at high flow speeds beyond the limits of the previously presented experiments. Numerical simulations employ the fitting of experimental data as inputs to define parameters. Wind tunnel static experiments provide the galloping force coefficient C y relative to the prism angle of attack. Additionally, free rotation tests allow evaluating the ball damping coefficient c θ as a function of its mass and the NES track radius. The result of the rotation tests provides a critical angular speed beyond which the ball damping increases nonlinearly. We point out the damping variation as an advantage of the BIT-NES; less damping at low angular velocities helps the ball start its rotation, while relatively large damping at higher speeds dissipates more How a ball free to orbit in a circular track mitigates the galloping of a square prism energy from the vibrating system. Numerical results exhibit four response modes for the NES; oscillatory at low flow speeds, intermittent within a small range of higher flow speeds, rotational at higher flow speeds, and ineffective regime at flow speeds out of the NES effective range. Modelling the primary mass as a parametric excitation source for the NES provides an analytical estimation of the boundary between the oscillatory and intermittent regimes. Furthermore, we advance an analytical analysis of the power flow across the integrated prism-NES system to explain the NES behaviour and predict the limit of its effective range.

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A comparative study on optimization of multiple essentially nonlinear isolators attached to a pipe conveying fluid

Cited by 56 publications

References 30 publications

NES cell

NES cell

Robust optimization of nonlinear energy sinks used for mitigation of friction-induced limit cycle oscillations

How a ball free to orbit in a circular track mitigates the galloping of a square prism

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