螺旋桨激励下船艉结构振动控制试验研究
Experimental investigation into vibration control of stern structure excited by propeller forces
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摘要:目的 对于船艉结构在螺旋桨激励下的振动控制问题，尝试采用隔振、阻振质量和阻尼涂层3种方法进行振动抑制。方法 通过振动测试获得轴系−船艉耦合系统的振动传递规律，根据测试结果，针对艉后轴承结构实施振动控制，检验所提3种控制方法抑制振动的有效性。结果 试验结果表明：受刚度变化限制，轴承座隔振降低中、低频共振峰值的效果有限；阻振质量对限制振动向艉部船体的传播比较有效；阻尼涂层对抑制中、高频振动峰幅值效果明显；3种控制方法的综合应用可使船艉结构的振动加速度总级下降6 dB以上。结论 所得结果对螺旋桨激励下船艉结构振动控制具有一定参考价值。Abstract:Objectives To reduce the vibration of stern structure excited by lateral propeller forces, the application of vibration isolation, vibration blocking masses and damping coating is carried out.Methods First, the vibration transmission characteristics of the shaft-stern coupled system are obtained through vibration testing, then the lateral excitation mainly transmits to the stern structure through the rear stern bearing is suppressed using three control methods based on the test results. Finally the validity of the respective proposed methods is verified.Results The test results show that vibration isolation has limited effectiveness in reducing vibration in the low to medium frequency range due to the limited range of stiffness variation; vibration blocking masses are more effective in isolating vibration transmission to the stern structure; and damping coating has significant effect on the attenuation of vibration in the high frequency range. The acceleration level of the stern structure is reduced by at least 6 dB under the comprehensive application of the three control methods.Conclusions The results obtained in this study have reference value for the vibration control of the stern structures excited by propeller forces.
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