某直翼桨型船舶尾部振动响应预报

Stern Vibration Response Prediction of a Straight-Bladed Ship

摘要: 直翼推进器是一种性能优良的新型推进装置，该推进器激励载荷与常规螺旋桨有较大区别，开展直翼推进器激励下尾部振动计算及预报具有重要意义。利用有限元法，针对直翼推进器作用于船体结构的轴承力和表面力激励，分别使用频域响应分析方法和时域响应分析方法计算尾部结构在额定工况下的振动响应。在基本方案的基础上，对比多方案在额定工况下的结构振动响应，分析不同结构方案对振动的影响。研究表明，采用考虑相位角的频域响应分析和时域响应分析两种方法计算结果吻合良好；合理地设置纵舱壁、适当增加板厚均能减小尾部振动。研究结果可为工程设计提供理论参考。

Abstract: Cycloidal propeller is a new type of propulsion device with excellent performance. Its thrust load is greatly different from conventional propellers. It is of great significance to carry out calculation and evaluation of stern vibration under the excitation of cycloidal propeller. Using the finite element method, the vibration response of the stern structure under rated condition was calculated using the frequency response analysis method and the transient response analysis method for the bearing force and surface force excitation of the cycloidal propeller working on the hull structure. Based on the basic scheme, the structural vibration responses of multiple schemes under rated condition were compared, and the vibration effects of different tail structure schemes were analyzed. The research shows that the calculation results using the frequency response analysis and the transient response analysis considering the phase angle are in good agreement; a reasonable longitudinal bulkhead and an appropriate increase in plate thickness can reduce the tail vibration. The research results can provide a theoretical reference for engineering design.