摘要
以艉部结构为例,阐述对船体结构进行三维有限元动力分析的基本过程和关键技术。建立艉部结构三维有限元模型,使用Fluent软件计算螺旋桨脉动压力,采用Helmholtz方法计算附连水质量;为了消除局部模态的干扰,使用模态参与因子提取结构的整体模态;计算结构的固有频率、模态、速度和加速度等动力学参数。实例分析表明所采用的分析方法能够准确预报结构的振动特性。
Aiming at the ship stern structure, the dynamic analysis process with 3D finite element method, and some key computational technology were detailed introduced. The fluctuation pressure of the propeller was computed with Fluent software. The virtual water mass was calculated by Helmholtz method. The natural frequencies were selected based on modal participation factor to remove the local vibration. The numerical results of the dynamical parameter of natural frequencies, modal, velocity, acceleration etc. showed that the calculation method described in this paper can well predict vibration and dynamic responses of ship stern structure.
出处
《船海工程》
2009年第4期28-31,34,共5页
Ship & Ocean Engineering
基金
教育部
财政部重大科研项目(No.200512)
关键词
振动
脉动压力
附连水质量
模态参与因子
动力响应
vibration
fluctuation pressure
virtual water mass
model participation factor
dynamic response
