摘要
为了提高水面舰船的声隐身性能,将推进轴系回旋振动作为艉部船体结构振动的激励源,建立了某水面舰船多支点推进轴系以及艉部船体的有限元模型,并针对两种边界条件下的轴系回旋振动模型进行了对比研究,重点开展了螺旋桨横向单位激励力下的轴系回旋振动对艉部船体的低频激励特性的分析,得到了回旋振动通过各轴承途径对船体的激励加速度、激励力以及传递功率流。研究表明,在进行回旋振动等动力学计算时,艉部船体的阻抗边界作用不可忽视;不论是考察振动加速度、传递动态力还是传递功率流,双臂艉轴架轴承都是最主要的传递路径,且与其它轴承相比较有明显的传递优势。在论文算例中13.5 Hz以及10 Hz是轴系回旋振动激励艉部船体的最主要的特征频率,需要重点关注。
In order to improve performance of acoustic stealth for surface ships,this paper considered whirling vibration of propulsion shafting as a vibration excitation source of the stern structure.Finite element models were established for the propulsion shafting with multi-supports of a surface ship and its stern structure.Models of vibration due to shaft whirling under two different boundary conditions were comparatively studied.Characteristics of excitation acceleration,excitation force and transmission power flow for the stern structure were obtained.The results showed that the impedance boundary effect of the stern structure should not be ignored in dynamic calculations.The double-arm strut bearing not only was the main transmission path,but also had significant transfer advantage compared with other bearings.In the present calculation example,13.5 Hz and 10 Hz were the most important characteristic frequencies excited by whirling and should be paid attention to.
作者
周凌波
段勇
孙玉东
魏强
ZHOU Lingbo;DUAN Yong;SUN Yudong;WEI Qiang(National Key Laboratory on Ship Vibration and Noise,China Ship Scientific Research Center,Wuxi 214082,China;China Ship Development and Design Center,Wuhan 430064,China)
出处
《中国造船》
EI
CSCD
北大核心
2018年第4期105-114,共10页
Shipbuilding of China
关键词
多支点
推进轴系
回旋振动
艉部船体
激励特性
multi supports
propulsion shafting
whirling vibration
stern structure
excitation characteristic
