中间支撑梁式动力吸振器的设计与实验研究

Design and Experimental Study on Multi-DOF Dynamic Vibration Absorbers with Intermediately Supported Beam Structures

通过在中间支撑梁端部布置质量块设计多自由度动力吸振器,首先分析所设计的动力吸振器的理论模型。然后通过优化算法推导得到多自由度动力吸振器的最优频率比、最优阻尼比。最后以单自由度、2自由度和四自由度动力吸振器为例,通过实验验证所设计的多自由度动力吸振器。理论分析与实验结果表明:对于相同质量的吸振器,四自由度动力吸振器的振动控制效果明显优于单自由度及2自由度动力吸振器,并且其可控制频带更宽。

The multi-DOF dynamic vibration absorber(DVA)with the mass blocks arranged at the end of the intermediately supported beams is designed.The theoretical model of the designed multi-DOF DVA is established and analyzed.Then,the optimal frequency ratio and the optimal damping ratio for the Multi-DOF DVA are derived by H∞optimization algorithm.Finally,with the single-DOF DVA,double-DOF DVA and 4-DOF DVA as the examples,their control performances are experimentally verified.Theoretical and experimental results show that the control performance of the 4-DOF DVA is much better than that of the single-DOF and double-DOF DVAs if the weights of these DVAs are the same.Furthermore,it is found that the 4-DOF DVA has wider effective control frequency band.