The bending vibration characteristic of a propulsion shafting and hull structure coupled system at low frequencies
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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 this paper, a finite element simulation model of the propulsion shafting and hull structure system is developed for analyzing the coupled bending vibration characteristic at low frequencies. The natural frequencies and modal shapes are analyzed through numerical simulation and are then compared with those from simplified simulation models. Simulation results show that at frequencies lower than the natural frequency of the first bending vibration mode, the coupled system vibrates under the hull-beam mode, and the shafting follows the hull. Near each natural frequency of the shafting, a vibration mode of hull structure also appears, and, therefore, the propeller-shafting's vibration can be transferred to the hull structure effectively. If the mass and cross-section area moment of the hull are far larger than those of shafts, and when the vibration modes of propulsion shafting are the only research subjects, the hull structure can be treated as a rigid body with little error. However, the coupled vibration mode and the shafts' anti-phase vibration mode may not be correctly reflected.
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Keywords:
- propulsion shafting /
- hull structure /
- coupled vibration /
- finite element /
- numerical simulation
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