结构形式对船体振动的影响分析

以船体主机下肋板为例，研究船体振动时船底肋板在频率10～150Hz范围振动剧烈的减振方法。通过改变结构的刚度和阻尼，探讨降低肋板剧烈振动的方法。其中改变结构的刚度，包括改变板厚和安装加强筋等，改变阻尼是通过敷设阻尼层来实现。利用ANSYS有限元软件进行模拟计算，对比分析结构的刚度和阻尼发生变化时肋板的振动变化，得出改变结构的刚度和阻尼都可以对局部振动起到降低振动的效果。从实际应用的经济性考虑，安装加强筋方法最优。

The Influence of Structural Configuration upon the Hull Vibration

The floor below the main engine was taken as example to research the measure for reducing hull vibration in the frequency range of 10-150Hz. Through the revision of the structure stiffness and damping, the means to reduce severe vibration were explored. The structural stiffness was changed by changing the plate thickness told installation stiffener, and the damping is changed by laying the damping layer. Comparing the results of FE simulation in ANSYS, the influences of structural stiffness and damping change upon vibration were analyzed. It showed that changing the structural stiffness and damping can reduce local vi- bration. From practical economic considerations, installation stiffener is the best way.