冰激力作用下的破冰船尾部振动响应分析

Vibration Response Analysis of Icebreaker Stern under Ice Induced Force

针对破冰船在冰区航行时,螺旋桨与海冰发生相互作用产生的激振力导致船体尾部发生强迫振动响应,对某破冰船建立海冰、螺旋桨、流体三者的耦合模型,采用离散元方法分析在螺旋桨流场下,不同厚度碎冰情况下船底所受脉动压力和冰载荷分布规律,建立船体三维有限元模型,综合考虑附连水质量、阻尼、激振力等,采用时域瞬态响应分析方法对船体尾部振动响应进行数值预报。

When the icebreaker sails in the ice region,the exciting force generated by the interaction between the propeller and sea ice leads to forced vibration response in the tail of the ship.A coupling model of ice,propeller and seawater was established for an icebreaker.The discrete element method was used to analyze the distribution of fluctuating pressure and ice load on the ship bottom under different thickness of broken ice.A three-dimensional finite element model of the stern structure was established to numerically analyze the vibration response of the stern.Considering the mass of attached water,damping and excitation force,the transient response analysis method was used to predict the vibration response of the ship tail.