Sustainable Marine Structures

Vibration Isolation Characteristics of Impedance-balanced Ship Equipment Foundation under Unbalanced Excitation

Yuxuan Qin

College of Shipbuilding Engineering, Harbin Engineering University, Harbin, Heilongjiang, 150001, China

Yinbing Wang

College of Shipbuilding Engineering, Harbin Engineering University, Harbin, Heilongjiang, 150001, China

Fuzhen Pang

College of Shipbuilding Engineering, Harbin Engineering University, Harbin, Heilongjiang, 150001, China

Zhiqi Fu

College of Shipbuilding Engineering, Harbin Engineering University, Harbin, Heilongjiang, 150001, China

Haichao Li

College of Shipbuilding Engineering, Harbin Engineering University, Harbin, Heilongjiang, 150001, China

DOI: https://doi.org/10.36956/sms.v5i1.856

Received: 29 April 2023; Revised: 10 June 2023; Accepted: 25 June 2023; Published: 30 June 2023

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Abstract

A new type of impedance-balanced ship equipment foundation structure based on the principle of impedance balancing using a “discontinuous panel-vibration isolation liquid layer-foundation structure” is proposed to solve the problem of poor low-frequency vibration isolation of the foundation under unbalanced excitation of shipboard equipment. Based on the finite element method, the influence of characteristic parameters of the foundation panel structure on its vibration reduction characteristics under unbalanced excitation is explored. The results show that the vibration isolation level of the impedance-balanced foundation is 10 dB higher than the traditional foundation in the low-frequency band of 10-500 Hz when subjected to combined excitation of concentrated force and moment. Increasing the thickness of the impedance-balanced foundation panel can enhance the isolation effect. Increasing the number of sub-panels can effectively reduce the vibration response of the foundation panel and enhance the isolation performance of the foundation. The connection stiffness between sub-panels has a small effect on the isolation performance of the foundation.

Keywords: Ship equipment foundation, Impedance-balanced design, Vibration isolation and reduction methods

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