对一型潜器的水下振动响应分析（英文）

Vibration Response Analysis of an Underwater Submersible

文章基于三维水弹性方法,分析了一型潜水器水下航行中的振动响应特性,通过求解干模态的广义坐标响应及对应的附连水质量,确定了干模态频率和湿谐振频率的对应关系。该文预报的水下响应曲线的峰值频率得到了水声试验测试结果的印证,说明了三维水弹性方法在求解水下结构振动响应问题上的有效性。文中最后对潜器尾部结构进行了改进,改进前后速度响应幅值曲线的比对表明,增加尾部纵桁结构的刚度对抑制潜器的尾部振动有明显的效果。

In this work, the vibration response characteristic of a type of submersible structure sail-ing underwater is investigated based on the three-dimensional hydroelasticity theory. The correspond-ing relationship between resonant frequencies of a submersible structure in vacuum and in water is obtained by figuring out both the responses at each of the principal coordinates and the hydrody-namic inertia corresponding to each mode of the dry hull. And the resonant frequencies of calculat-ed response curves are well confirmed by the data from the acoustic test, illustrating that the three-dimensional hydroelasticity method is efficient to solve the vibration response problems of an under-water structure in many engineering projects. Moreover, this paper attempts to improve the stern struc-ture for vibration reduction, and the vibration response curves of submersible structure before and af-ter the improvement measure are compared, and the comparison shows that reinforcing the after main longitudinal structure members can effectively restrain the vibration on the stern structure of a sub-mersible.