船舶推力轴承弹性支承的轴系纵振减振性能研究

运用结构弹性波理论,以推力轴承及其弹性支承系统作为一端边界条件,建立推进轴系纵向振动理论模型,详细推导轴系纵向振动特征频率方程,基于泰勒级数展开得到轴系纵振一阶固有频率估算解析式;结合某型船舶参数,重点对比研究集成隔振系统与RC支承子系统对轴系纵振衰减效果,分析结果表明:集成隔振系统能够在较大频段内有效衰减轴系纵向振动,而RC支承子系统表现动力吸振特性;在保证轴系运行安全性的基础上,增大集成隔振系统质量或减小RC支承子系统质量有助于扩大减振频段。

Research on longitudinal vibration isolation of marine shafting under elastic supporting forms of thrust bearing

Based on the theory of elastic wave in structure, through the established longitudinal vibration model of the shafting which takes thrust bearing and its supporting system as one boundary condition, the frequency characteristic equation of longitudinal vibration was derived and the first-order natural frequen-cy with Taylor series was estimated. Then combined with a certain ship parameters, the comparative re-search on the isolation effect of shafting longitudinal vibration between Integrated Vibration Isolator and Resonance Charger was put. The results show that the effect of Integrated Vibration Isolator could be bet-ter in large frequency bands, while RC more performance characteristics of DVA; furthermore, on the basis of safety operation of the shafting, larger damping frequency bands could be acquired with more weight of In-tegrated Vibration Isolator and less of RC.