船舶避振穴隔振特性研究

避振穴是一种减小船舶尾部振动的重要装置,本文采用基于橡胶材料超弹性和空气压缩性的非线性有限元方法对其进行数值模拟和隔振特性分析。选取Mooney-Rivlin模型对橡胶材料非线性特性进行模拟,建立气体单元模拟加压空气,对一个独立密闭气室结构进行充气过程模拟和振动响应计算,分析气室深度、初始气压和橡胶板厚度等参数对其隔振特性的影响。将避振穴应用于实船尾部模型,验证其对螺旋桨激振力的隔振效果。计算结果表明,避振穴对于船舶尾部减振具有显著效果,但需要留意其在低频共振区引起的响应增大情况。

Vibration isolation characteristics of ship anti-vibration cave

The Anti-Vibration Cave is an important device for vibration reducing on ship’s stern. In this paper, nonlinear finite element method has been used to investigate its vibration isolation characteristics, based on the hyperelastic behavior of rubber material and compressibility of air. The Mooney-Rivlin hyperelastic model has been chosen to describe the material nonlinear elasticity, and hydrostatic fluid element has been created to simulate the pressurized air. Numerical simulation of the inflation process and the vibration response calculation of a separate air-filled cavity have been carried out. The effect of parameters, such as cave depth, initial pressure and rubber plate thickness on its vibration isolation characteristics have been analyzed. The anti-vibration cave has been arranged in a ship model to verify its vibration isolation effect under the propeller excitation. Results show that anti-vibration cave has a significant effect on the vibration reduction of stern, but it need more attention to the response at low frequency.