The relationship between installation stiffness and the natural characteristics of reinforced cylindrical shells and its application to structural vibration mitigation design

Lufei Li; Jincheng Gao; Jingyi Xiong; Fuzhen Pang; Cong Gao; Haichao Li

doi:10.59400/sv2952

The relationship between installation stiffness and the natural characteristics of reinforced cylindrical shells and its application to structural vibration mitigation design

Lufei Li College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China
Jincheng Gao Wuhan Second Ship Design and Research Institute, Wuhan 430061, China
Jingyi Xiong Wuhan Second Ship Design and Research Institute, Wuhan 430061, China
Fuzhen Pang College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China
Cong Gao College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China
Haichao Li College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China

Article ID: 2952

Keywords: near-free vibration isolation design; stiffened cylindrical shell; finite element analysis; installation stiffness; natural frequency

Abstract

The study primarily focuses on the impact of the installation stiffness at the bottom of the reinforced cylindrical shell on its natural characteristics. Using the finite element modal analysis method, it systematically investigates the effects of three installation stiffness forms—rigid base, rubber pad-supported base and isolator-supported base on the natural frequencies and mode shapes of the stiffened cylindrical shell. Additionally, the influence of key parameters such as rubber pad thickness and elastic modulus on the natural characteristics of the stiffened cylindrical shell is examined. The results show that as installation stiffness increases, the natural frequencies of the stiffened cylindrical shell significantly rise, with a more pronounced effect on lower-order modes. The rubber pad-supported base maintains vibration characteristics close to those of the free state, particularly above 50 Hz. Furthermore, increasing the rubber pad thickness and decreasing the elastic modulus both lead to a reduction in natural frequency, particularly for lower-order modes, which are more sensitive to these parameter changes. These findings provide important guidance for optimizing the vibration characteristics and isolation design of stiffened cylindrical shell structures.

Published

2025-05-06

How to Cite

Li, L., Gao, J., Xiong, J., Pang, F., Gao, C., & Li, H. (2025). The relationship between installation stiffness and the natural characteristics of reinforced cylindrical shells and its application to structural vibration mitigation design. Sound & Vibration, 59(2), 2952. https://doi.org/10.59400/sv2952

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Issue

Vol. 59 No. 2 (2025)

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Article

This work is licensed under a Creative Commons Attribution 4.0 International License.

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