Vibration reduction of floating raft system based on nonlinear energy sinks

Wang, Hong-Li; Ding, Hu

doi:10.1016/j.oceaneng.2023.116211

Cited by 13 publications

(3 citation statements)

References 40 publications

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“…Vibrations and noise generated by power equipment, such as diesel engines and auxiliary machinery, can adversely affect the marine environment and the physical and mental health of crew members. Currently, passive vibration isolation is the primary means of reducing vibration transmission and noise radiation [1][2][3][4]. To further enhance the suppression of low-frequency vibrations, active vibration isolation (AVI) can part of the units can yield vibration attenuation comparable to the full activation.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the on/off status configuration of control units in an active vibration isolation system—experiment

Wu,

Zheng,

et al. 2024

Smart Mater. Struct.

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Active vibration isolation (AVI) is an important measure to attenuate vibration transmission in underwater vehicles and multiple active control units are usually used to attenuate low frequency vibrations induced by power equipment. Under certain operation conditions, however, the pre-installed control units in an AVI system may be redundant. Hence, it is necessary to optimize the on/off status configuration of all the control units. An optimization approach is proposed for configuration optimization of control units and validated by experiments. The criterion of the proposed approach is derived from the vibration responses of the monitoring points. The involved optimization, formulated as a constrained 0-1 nonlinear programming problem, utilizes the on/off status of control units as the input variable and the number of active units as the constraint. Optimized configurations were obtained by solving the nonlinear programming problem and deployed to the experimental system. The test results have demonstrated that vibration of the monitoring points can be effectively suppressed by activating only a portion of control units, and the configurations corresponding to maximum vibration reduction vary with different excitations.

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Section: Introductionmentioning

confidence: 99%

Optimization of the on/off status configuration of control units in an active vibration isolation system—experiment

Wu,

Zheng,

et al. 2024

Smart Mater. Struct.

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“…A nonlinear energy sink (NES) is a nonlinear vibration absorber with high damping performance [1][2] , and is a promising passive vibration control technique [3][4][5] owing to its simple structure, low mass, and high robustness [6][7] . It overcomes the disadvantage that the traditional linear vibration absorber can only control vibration at a single frequency [8][9][10] , which effectively broadens the vibration reduction frequency band when the system frequency changes [11][12] . In addition, an NES shows excellent vibration reduction performance under different values of excitation [13][14][15][16][17] .…”

Section: Introductionmentioning

confidence: 99%

A vertical track nonlinear energy sink

Li,

Ding

2024

Appl. Math. Mech.-Engl. Ed.

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Eliminating the effects of gravity and designing nonlinear energy sinks (NESs) that suppress vibration in the vertical direction is a challenging task with numerous damping requirements. In this paper, the dynamic design of a vertical track nonlinear energy sink (VTNES) with zero linear stiffness in the vertical direction is proposed and realized for the first time. The motion differential equations of the VTNES coupled with a linear oscillator (LO) are established. With the strong nonlinearity considered of the VTNES, the steady-state response of the system is analyzed with the harmonic balance method (HBM), and the accuracy of the HBM is verified numerically. On this basis, the VTNES prototype is manufactured, and its nonlinear stiffness is identified. The damping effect and dynamic characteristics of the VTNES are studied theoretically and experimentally. The results show that the VTNES has better damping effects when strong modulation responses (SMRs) occur. Moreover, even for small-amplitude vibration, the VTNES also has a good vibration suppression effect. To sum up, in order to suppress the vertical vibration, an NES is designed and developed, which can suppress the vertical vibration within certain ranges of the resonance frequency and the vibration intensity.

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“…The results showed that a simple lumped mass pipe model provided sufficient information for evaluating the dynamic behavior of piping systems. The piping system and important equipment of modern ships are installed on the foundation support through a floating raft system [9], and the response behavior and shock environment of the pipe-float raft when the ship suffers from a shock-wave load are complicated. However, the existing studies on the shock resistance of ship piping systems have not addressed the shock-wave load-transfer law or the response behavior of key areas of pipe-float systems.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Load-Transfer Law and Shock Environment of a Pipe–Float System

Li,

Chen

et al. 2024

JMSE

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To study the load-transfer law and shock environment of a pipe–float system, an experimental model was designed, manufactured, and installed on a floating shock platform. Two underwater explosion cases were studied, focusing on vertical and horizontal shock cases. The experimental results show that the structure of the system on the floating raft significantly influences the load acceleration transfer and the composition of the vertical and horizontal components. Furthermore, the flexible connector can effectively block the response behavior of the two ends of the pipe, and the peak acceleration difference between the two pipe ends is 98.9%. The vertical and horizontal components of the shock-wave load affect the stress concentration locations on the pipe. The main frequency in the shock environment at the connection point between the floating raft and the upper equipment shifts toward middle and low frequencies under the influence of the upper equipment, and it will be closer to the natural frequency of the upper equipment.

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Vibration reduction of floating raft system based on nonlinear energy sinks

Cited by 13 publications

References 40 publications

Optimization of the on/off status configuration of control units in an active vibration isolation system—experiment

Optimization of the on/off status configuration of control units in an active vibration isolation system—experiment

A vertical track nonlinear energy sink

Experimental Study of the Load-Transfer Law and Shock Environment of a Pipe–Float System

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