基于动柔度方法的管路动力吸振器设计研究

  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。

Effect of local modifications on the vibration characteristics of linear systems

  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.