摘要
以某柴油机推进轴系为例,建立了扭转-纵向冲击有限元模型,加入柴油机曲轴和螺旋桨附水引起的扭纵耦合效应,研究了扭纵耦合轴系的自由振动和扭转-纵向冲击响应,并与无耦合轴系结果进行对比,分析了扭纵耦合效应对推进轴系自由振动和冲击响应的影响。结果表明,扭纵耦合效应对推进轴系的固有频率影响不大,但它明显地影响了冲击响应,扭纵耦合下,单一类型(扭转或纵向)冲击会同时激发纵向和扭转振动,并且引起较大的位移和扭矩波动,威胁轴系运行安全。因此船舶推进轴系的扭转-纵向冲击在设计阶段应予以足够的重视。
A torsional-longitudinal shock finite element model for a diesel engine,s propulsion shaft system was established considering torsional-longitudinal coupled effects caused by the diesel engine ’ s crankshaft, and added hydrodynamic inertia and damping of a ship, s propeller. The free vibration and torsional-longitudinal shock responses of the coupled system were studied and compared with those of the uncoupled system to analyze influences of torsional- longitudinal coupled effects on the free vibration and shock responses of the propulsion shaft system. Results showed that the torsional-longitudinal coupled effects have little influence on the natural frequencies of the propulsion shaft system, but they obviously influence the shock responses of the propulsion shaft system ; under the torsional-longitudinal coupled effects, either a single longitudinal shock or a single torsional one can simultaneously excite longitudinal vibration and torsional one to cause larger fluctuations of displacements and torques, and threaten the operation security of the shaft system, so enough attentions must be paid to torsional-longitudinal shock responses of a ship propulsion shaft system in its design stage.
出处
《振动与冲击》
EI
CSCD
北大核心
2017年第13期96-102,共7页
Journal of Vibration and Shock
关键词
船舶推进轴系
冲击响应
扭纵耦合
ship propulsion shaft system shock response
torsional-longitudinal coupled effect
