局域共振浮筏隔振系统的低频隔振性能研究

Research on Low-Frequency Vibration Isolation Performance of Locally Resonant Floating Raft Vibration Isolation System

为提升浮筏隔振系统的低频隔振性能,提出在筏架表面周期布置局域共振元胞的设计方法,构建局域共振浮筏隔振系统的动力学模型,以系统的输出功率流为评价指标,分析共振元胞对单频和多频振动激励下浮筏隔振系统低频隔振性能的影响.研究表明,在附加振子质量小于筏架质量10%的前提下,能够降低系统的输出功率流幅值30%左右;共振元胞中含不同固有频率的振子时,可以同时降低多个频率处系统的输出功率流.研究结果可为采用局域共振结构提升浮筏隔振系统低频隔振性能提供理论指导.

In order to improve the low-frequency vibration isolation performance of the floating raft isolation system,the design method of arranging locally resonant cells on the surface of the raft frame periodically is proposed,and the dynamics model of the locally resonant floating raft isolation system is constructed,and the influence of the resonant cells on the low-frequency vibration isolation performance of the floating raft isolation system under single-frequency and multi-frequency vibration excitation is analyzed with the output power flow of the system as the evaluation index.Results shows the output power flow of the system can be reduced by about 30%when the mass of the additional resonators is less than 10%of the raft mass;the output power flow of the system at multiple frequencies can be reduced simultaneously when the resonant cell contains resonators of different natural frequencies.The research results can provide theoretical guidance for improving the low-frequency vibration isolation performance of the floating raft isolation system by using locally resonant structure.