船用复合材料管路振动特性试验研究

为研究船舶中复合材料充液管路的减振特性,首先采用几何尺寸相同的复合材料直管和钢直管进行振动响应对比分析。通过直管的四端阻抗测试,获得2种材料直管的传递矩阵,对比分析复合材料管路与钢管的振动传递损失。然后对2种材料直管进行自由边界下的模态测试,获取管路的阻尼系数。试验结果表明:在满足输水性能和结构强度的前提下,复合材料管路只是同几何尺寸钢管质量的一半,复合材料管的固有模态频率要低于钢管,模态阻尼系数却远大于钢管。在2500 Hz内复合材料管的横向振动传递损失优于钢管;而轴向传递损失在低频段要劣于钢管,高频段又优于钢管。因此在减振性能上,复合材料管更利于振动能量在传播过程中的衰减。研究成果可为复合材料在船舶充液管路减振降噪中的应用提供参考。

Experiment analysis on the vibration characteristic of composite pipe

In order to study the vibration characteristics of composite fluid-filled pipes in ships,the vibration response of composite straight pipes and steel straight pipes with the same geometrical size were compared and analyzed.The transfer matrices of two kinds of straight pipes were obtained by impedance test,and the vibration transmission losses of composite pipes and steel pipes were compared and analyzed.Then,modal tests of two kinds of straight pipes with free boundary are carried out to obtain the damping coefficients of the pipes.The experimental results show that,the composite pipe is only half the mass of steel pipe of the same geometric size,the natural modal frequency of the composite pipe is lower than that of the steel pipe,but the modal damping coefficient is much larger than that of the steel pipe.The research results can provide references for the application of composite materials in vibration and noise reduction of ship filling pipelines.