基于波动理论的共振转换器减振特性分析

Analysis on the damping characteristics of resonance changers based on the wave theory

[目的]共振转换器(RC)作为一种有效的减振装置,在船舶轴系纵向振动控制领域备受关注。鉴于共振转换器内部结构参数与其减振效果密切相关,[方法]面向工程化设计,首先,运用波动理论推导声压在共振转换器内传播的解析式,并构建内部结构参数与其振动机理的物理关系;然后,分析共振转换器外接管系和外接腔体的设计参数对系统插入损失、宽频带内声压级的影响规律及灵敏度。[结果]结果表明,共振转换器在其固有频率处可较好地实现对主系统共振峰的控制。[结论]对于原系统特征线谱消振的需求,需关注外接管系尺寸的选择;而对于频带内声压级总体控制,则需关注外接腔体尺寸的设计。

[Objectives]Resonance Changer(RC)is an effective vibration damping device,which receives much attention in the field of longitudinal vibration control of marine shafting.As the RC's damping effect is closely related to the internal structural parameters,[Methods]an analytical formula of sound pressure propagation in RC was derived based on the wave theory,and the physical relationship between the internal structural parameters and its vibration mechanism was constructed for engineering design.Then,the influence of design parameters of RC's external pipes and cavity on system insertion losses and sound pressure level in broad band as well as the sensitivity were analyzed.[Results]The results show that,RCs can control the resonance peak of the main system well at its natural frequency.[Conclusions]Attention should be paid to the external pipe size of RCs when considering the feature line spectrum suppression,and to the external cavity size when considering the overall control of sound pressure level in broad band.