推进轴系——船体结构低频弯曲振动耦合特性

发布时间：2019-06-09 13:51

【摘要】：为分析水面舰船推进轴系与船体结构的低频弯曲耦合振动问题,利用有限元法建立了推进轴系—船体结构耦合系统的数学模型,计算系统的垂向及水平向弯曲振动固有特性,并与利用简化模型得到的计算结果进行了对比分析。结果表明:在推进轴系第1阶弯曲振动固有频率以下频段,推进轴系—船体结构系统主要体现为船体梁振动,推进轴系跟随船体梁运动;在推进轴系的每阶振动固有频率附近,由于存在一个固有频率非常接近的船体梁振动模态,故在该频段桨—轴系统与船体梁有较强的耦合作用;在船体梁的质量及截面面积惯性矩远大于轴系对应参数的情况下,仅分析推进轴系自身的低频固有振动特性时,将船体结构简化为刚性安装基础所带来的误差很小,但是推进轴系简化模型不能反映推进轴系—船体结构的耦合振动模态及多轴系时的反相位振动模态。
[Abstract]:In order to analyze the problem of low frequency bending coupling vibration between propulsion shafting and hull structure of surface ship, the mathematical model of propulsion shafting and hull structure coupling system is established by using finite element method, and the natural characteristics of vertical and horizontal bending vibration of the system are calculated. The results are compared with those obtained by using the simplified model. The results show that in the frequency band below the natural frequency of the first order bending vibration of the propulsion shafting, the propulsion shafting-hull structure system is mainly embodied in the vibration of the hull beam, and the propulsion shafting follows the motion of the ship body beam. In the vicinity of the natural frequency of each order vibration of the propulsion shafting, because of the existence of a vibration mode of the hull beam with very close natural frequency, the propeller-shaft system has a strong coupling effect with the hull beam in this frequency band. When the mass and section area moment of inertia of the hull beam are much larger than the corresponding parameters of the shafting, the error caused by simplifying the hull structure to the rigid installation foundation is very small when only analyzing the low frequency natural vibration characteristics of the propulsion shafting itself. However, the simplified model of propulsion shafting can not reflect the coupled vibration mode of propulsion shafting and hull structure and the inverse phase vibration mode of multi-shafting.
【作者单位】：中国舰船研究设计中心;
【分类号】：U664.21

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