基于动柔度方法的管路动力吸振器设计研究

Design and study on dynamic vibration absorber of fluid-conveying pipes based on the receptance method

[目的]载流管路系统在受到外界激励时会引起振动,为减小载流管路的振动,研究动力吸振器的减振特性,[方法]基于动柔度方法中的被动修改法,推导得出附加弹簧质量系统的多自由度系统的动柔度矩阵,并对该多自由度系统中的目标自由度进行零点配置,使该自由度下的相应振动得到抑制。在此基础上,设计一种管路动力吸振器,并应用到载流管路上进行实验,以验证其减振效果。[结果]结果表明:设计的管路动力吸振器能够较好地吸收目标频率下的振动,且在目标频率相同时,吸振器的调谐质量越大,吸振效果越好。[结论]此管路动力吸振器安装拆卸方便、适用范围广,可为管路减振研究提供一定的参考。

[Objectives]The fluid-conveying pipes may vibrate under external excitation.In order to reduce the vibration of the fluid-conveying pipes and study the vibration-reduction characteristics of the Dynamic Vibration Absorber(DVA),[Methods]the receptance matrix of the multi-degree-of-freedom(DOF)system of the additional spring-mass system was derived based on the passive modification method in the receptance method,and the zero assignment of the target DOF in the multi-DOF system was performed to suppress the corresponding vibration under the target DOF.On this basis,a DVA was designed and applied to the fluid-conveying pipes for experiments to verify its vibration-reduction effect.[Results]The results show that the designed DVA can well absorb the vibration at the target frequency,and the vibration reduction is better for a larger tuned mass when the target frequency is the same.[Conclusions]Such DVA is convenient to install and has a wide application range,which can provide a certain reference for pipe vibration reduction research.