附连水对基座机械输入阻抗影响研究

On the Effect of Additional Water on the Mechanical Input Impedance of Foundation

基于理论公式和有限元方法,研究附连水对设备基座机械输入阻抗的影响。根据船体结构在不同的频段内的特性,采用两种简化模型重点研究低频段和中频段里基座的输入阻抗特性。结果显示,当激励频率很低时,船体外附连水对基座机械输入阻抗影响很大,附连水质量越大输入阻抗越大;随着频率的升高,附连水对输入阻抗的影响逐渐变小。

The effect of additional water on the mechanical input impedance of marine equipment＇s foundation was studied,by the theoretical formula and FEM.According to the characteristics of hull structure in different frequency band,mechanical input impedance of foundation under low and middle frequency band was studied,using two different simplified models.The results showed that the additional water had great influence on the mechanical input impedance of foundation under low frequency,input impedance and additional water was proportional relationship.As the frequency increased,the effect of additional water on the input impedance becomes smaller.