Dynamic characteristics analysis of vibration isolation system with nonlinear energy sink on flexible foundation

Dynamic characteristics analysis of vibration isolation system with nonlinear energy sink on flexible foundation

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Sen CHEN^1a^,^1b, Xiang ZHU^1a^,^1b^,², Tian-yun LI^1a^,^1b^,², Shu-xin CHEN^1a^,^1b, Wei DAI^1a^,^1b^,²

Journal of Ship Mechanics | 2025, 29(1) : 145 - 155

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Journal of Ship Mechanics | 2025, 29(1): 145-155

• Hydro/Structural/Acoustics •

Dynamic characteristics analysis of vibration isolation system with nonlinear energy sink on flexible foundation

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Sen CHEN^1a^,^1b, Xiang ZHU^1a^,^1b^,², Tian-yun LI^1a^,^1b^,², Shu-xin CHEN^1a^,^1b, Wei DAI^1a^,^1b^,²

Affiliations

^1a.School of Naval Architecture and Ocean Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

^1b.Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics (HUST), Huazhong University of Science and Technology, Wuhan 430074, China

^2.Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration (CISSE), Shanghai Jiao Tong University, Shanghai 200240, China

Published: 2025-01-20 doi: 10.3969/j.issn.1007-7294.2025.01.014

Outline

Abstract

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For low-frequency line spectrum control in naval and other engineering fields, a nonlinear energy sink vibration isolation system dynamics model considering a flexible foundation was established, and the nonlinear dynamics of the system was analyzed using the harmonic balance method and Runge-Kutta method. The influence of the foundational parameters on the amplitude-frequency characteristics of the system was explored, and the nonlinear dynamical behavior of the system at the resonant frequency was analyzed. The influence law of mass ratio, cubic stiffness, and damping on the damping effect of nonlinear energy sink was explored with vibration power flow as the evaluation parameter. For the computational model analyzed, research shows: when the foundation stiffness is weak, the nonlinear energy sink has a large effect on the amplitude and frequency response characteristics of the equipment; for specific parameters, the state of motion of the base and the equipment at the first order resonant frequency may be different; the nonlinear energy sink has a superior damping effect, reducing the peak power flow to the base by 13.95 dB in this example.

Key words

flexible foundation / nonlinear energy sink / harmonic balance method / power flow analysis

Cite this Article

Sen CHEN, Xiang ZHU, Tian-yun LI, Shu-xin CHEN, Wei DAI. Dynamic characteristics analysis of vibration isolation system with nonlinear energy sink on flexible foundation[J]. Journal of Ship Mechanics, 2025 , 29 (1) : 145 -155 . DOI: 10.3969/j.issn.1007-7294.2025.01.014

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Year 2025 volume 29 Issue 1

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Article Info

doi: 10.3969/j.issn.1007-7294.2025.01.014

Receive Date：2024-07-14
Online Date：2026-03-24
Published：2025-01-20

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History

Received：2024-07-14

Funding

Affiliations

^1a.School of Naval Architecture and Ocean Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

^1b.Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics (HUST), Huazhong University of Science and Technology, Wuhan 430074, China

^2.Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration (CISSE), Shanghai Jiao Tong University, Shanghai 200240, China

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表12种不同金属材料的力学参数

科 Family	属数 Number of genus	种数 Number of species	占总种数比例 Percentage of total species (%)	属 Genus	种数 Number of species	占总种数比例 Percentage of total species (%)
鹅膏菌科Amanitaceae	2	11	5.26	鹅膏菌属 Amanita	10	4.78
小菇科 Mycenaceae	2	12	5.74	丝盖伞属 Inocybe	5	2.39
多孔菌科 Polyporaceae	8	14	6.70	蜡蘑属 Laccaria	5	2.39
红菇科 Russulaceae	3	23	11.00	小皮伞属 Marasmius	6	2.87
				小菇属 Mycena	11	5.26
				光柄菇属 Pluteus	5	2.39
				红菇属 Russula	17	8.13
				栓菌属 Trametes	5	2.39

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