Analysis and design of the power law damping based on the nonlinear vessel isolation system

Wang, You; Zhu, Xinghua; Zheng, Rong; Tang, Zhe; Chen, Bingbing

doi:10.1177/1687814018817194

Cited by 3 publications

(4 citation statements)

References 24 publications

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“…The appropriate cubic nonlinear damping can keep the resonant frequency unaffected for the floating raft isolation system. 14 The resonant frequencies of the isolation system are ω 1 max = 6 . 13 Hz and ω 2 max = 12 . 77 Hz , respectively.…”

Section: The Ofrf Design Applicationmentioning

confidence: 99%

“…They established the relationship between the system output frequency response and parameters that define the system nonlinearity by employing the output frequency response function (OFRF) approach. Wang et al 14 presented the effects of the cubic nonlinear damping on the vessels’ floating-raft isolation system, and the single diesel engine rotating condition and the double diesel engine rotating condition were considered. Zhu and Lang 15,16 derived an efficient algorithm based on the OFRF concept in order to facilitate the nonlinear systems design in the frequency domain, and provided a general design procedure for a nonlinear auto regressive with exogenous (NARX) inputted model.…”

Section: Introductionmentioning

confidence: 99%

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Design of a floating raft system by exploiting the nonlinear damping

Wang

Zhu

Guo

et al. 2023

Advances in Mechanical Engineering

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In the present study, the optimization design of the cubic nonlinear damping is conducted for a floating raft isolation system, which can be simplified as a multiple degree-of-freedom system with double parallel freedom inputs. The direct relationship between the power transmissibility and cubic nonlinear damping parameters is derived by taking advantage of the output frequency response function (OFRF) approach. The design requirements are proposed in order to achieve low resonant peak values, low power transmissibility over the high frequency range. The detailed step-by-step design process of the floating raft isolation system applied in a practical vessel is provided. A polynomial function, in terms of the required frequency range, is developed and validated from the simulation data. The case application indicates that the design method determined by the OFRF approach can effectively realize the design requirements of a floating raft isolation system, which can deal with the relationship of the power transmissibility and nonlinear damping parameters.

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Section: The Ofrf Design Applicationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of a floating raft system by exploiting the nonlinear damping

Wang

Zhu

Guo

et al. 2023

Advances in Mechanical Engineering

Self Cite

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“…The results showed that the bearing with lower vertical stiffness can effectively isolate long-term ground vibration [23]. Different isolation systems and the material characteristics of isolation bearings can have an impact on the isolation effect [24][25][26][27][28]. Zhang et al mainly studied the seismic performance of rubber isolation bearings and found that natural rubber bearings have good isolation effects [29].…”

Section: Introductionmentioning

confidence: 99%

Design and Experimental Analysis of Seismic Isolation Bearings for Nuclear Power Plant Containment Structures

Pei,

Qi,

Xue

et al. 2023

Buildings

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The aim of this study was to further research the mechanical properties of epoxy thick-layer rubber isolation bearings, adopting orthogonal design and efficacy coefficient methods in order to optimize the geometric dimensions and material parameters of the bearing, summarizing the influence of various factors on the overall performance indicators of the bearing, and determining the optimal plan through parameter adjustment. Through a combination of experiments and simulations, the fundamental characteristics of epoxy thick-layer rubber isolation bearings are studied to determine the influence law of vertical pressure on their horizontal stiffness, vertical stiffness, and damping ratio. The analysis results suggest that epoxy plate thick-layer rubber isolation bearing exhibits stable deformation ability and possesses distinctive damping characteristics. Furthermore, it is observed that the horizontal stiffness of these bearings gradually diminishes as the vertical pressure increases. When the shear displacement reaches 80 mm, there is a notable strengthening effect observed in the horizontal stiffness of the bearing. This strengthening phenomenon proves advantageous in preventing damage to the bearing due to excessive displacement; furthermore, it is noteworthy that the vertical stiffness and damping ratio of the bearing increased with the rise in vertical pressure.

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“…In recent years, nonlinear isolators have drawn increasing attention since they possess the advantage of mitigation effectiveness compared with the linear ones. [3][4][5] The characteristics of many different kinds of nonlinear isolators in recent years have been summarized by Ibrahim,6 in which a group of isolators that utilize the nonlinear stiffness mechanism to lower their natural frequencies have been confirmed in mitigations of low-frequency vibrations. Zhang et al, 7 Carrella et al, 8,9 and Le and Ahn 10 investigated a novel combined positive and negative stiffness isolator (CPNSI) to mitigate wide-band vibrations.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the hysteresis behavior of a convex column brace based on buckling mode transition mechanism

Zhang

Wang

Fang

et al. 2019

Advances in Mechanical Engineering

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Brace structures with nonlinear stiffness are attractive in vibration mitigation. A new brace consisting of a novel convex column, which is characterized by the addition of a bulge structure compared to a column with constant cross-section, is proposed as a hysteresis brace structure with great applicability for mitigation of low-frequency vibration. The negative stiffness and D-shaped hysteresis damping of the proposed convex column brace generated by the buckling mode transition are verified theoretically and numerically. Comparisons of hysteresis characteristics of the proposed convex column brace and the one with the constant cross-section column are carried out to testify the outperformances of the proposed brace. The results demonstrate that the convex column brace can provide stronger bearing capacity with a smaller deflection and realize hysteresis damping within a shorter displacement range. In addition, a full parametric study is conducted to clarify the effects of geometric properties on hysteresis behavior. The investigation performed in this study not only demonstrates the great applicability of the proposed convex column brace, but also provides guidance on brace design for mitigation in practical application.

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Analysis and design of the power law damping based on the nonlinear vessel isolation system

Cited by 3 publications

References 24 publications

Design of a floating raft system by exploiting the nonlinear damping

Design of a floating raft system by exploiting the nonlinear damping

Design and Experimental Analysis of Seismic Isolation Bearings for Nuclear Power Plant Containment Structures

Investigation of the hysteresis behavior of a convex column brace based on buckling mode transition mechanism

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