气垫船典型结构振动特性分析

Vibration characteristics analysis of typical structure of hovercraft

由于气垫船的船型特点、运行原理等与常规船相比有很大区别,使得其速度较常规船高出很多,此外还会搭载高转速发动机、高转速空气螺旋桨等,这就使得气垫船振动问题尤为突出,可能引起强度、航行安全、舒适性等问题,因此确定振动源并计算典型位置的振动特性尤为重要。本文选取气垫船垫升主机及推进主机基座这一典型结构,利用有限元法,考虑多种激振力在同一位置处的瞬态响应,求解速度时历的均方根值,并与测试数据进行对比。结果表明考虑多种激振力同时作用的效果与实际测试结果相近,结果可靠,可以借鉴应用于气垫船振动特性的分析研究。

Due to the great difference between hovercraft and conventional craft in ship type characteristics and operation principle,the speed of hovercraft is much higher than that of conventional craft.Also,it is equipped with a high-speed engine and high-speed air propeller,which makes the vibration problem of hovercraft particularly prominent,which can cause strength,navigation safety,comfort,and other problems.Therefore,the vibration source is determined and the typical position is calculated The vibration characteristics of the device are particularly important.In this paper,the typical structure of the main engine and the base of the propulsion engine of the hovercraft is selected.The transient response of various exciting forces at the same position is considered by using the finite element method.The root means the square value of the velocity time history is solved and compared with the test data.The results show that the effect of considering multiple excitation forces at the same time is similar to the actual test results,and the results are reliable,which can be used for reference in the analysis and research of the vibration characteristics of hovercraft.