控制船舶轴系纵向振动的动力吸振器参数优化研究(英文)

在船舶轴系中安装动力吸振器是减小船舶轴系纵向振动的有效方法,而动力吸振器的参数合理优化配置是控制轴系纵向振动的重要手段。将船舶轴系等效为多自由度系统,基于有限单元法建立船舶轴系纵向振动运动模型,并通过加装动力吸振器用于控制船舶轴系纵向振动。运用重分析方法求解轴系运动方程得到推力轴承处的力传递率和能量传递率,将二者作为评价动力吸振器对轴系振动控制效果的指标。在研究轴系响应频率范围内,提出将求解全局最优解较强的遗传算法与多目标优化算法相结合以优化动力吸振器参数;并且研究特定共振峰消减的参数优化问题。最后通过算例,比较不同目标函数以及动力吸振器不同安装位置对轴系纵向振动控制的影响,验证文中优化算法的可行性。

Parameters Optimization of the Dynamic Absorber to Control the Axial Vibration of Marine Shafting System

Dynamic absorber is an effective instrument to reduce the marine structural vibration through the thrust bearing induced by shafting system.Thus,it is desirable to decrease the vibration by optimizing the parameters of designed dynamic absorber.In this paper,the dynamic absorber system,including a mass,a support spring and a linear damper is investigated.The marine shafting system is modeled as a multiple degree-of-freedom system that can be solved by the finite element method to obtain the dynamic response of axial vibration.The performances of the dynamic absorber are evaluated under the criteria of force transmissibility and power transmissibility at the thrust bearing,which are derived by re-analysis method.Using the genetic algorithm and multi-objective optimization algorithm,the dynamic absorber parameters over certain frequency ranges are optimized and the specific resonance is attenuated in a marine shafting system.Different objective functions as well as different locations of the dynamic absorbers on the shaft are compared to investigate the influence on the axial vibration and validate the feasibility of the optimization algorithm presented.The results show that the vibration transmissibility is able to serve as a good criterion for the marine shafting system design and vibration control.