气动式振动台振动信号生成机理研究  

Generation mechanism of vibration signals for repetitive shock machines

作　　者：王考[1] 陶俊勇[1] 陈循[1] 

机构地区：[1]国防科技大学机电工程与自动化学院,湖南长沙410073

出　　处：《振动工程学报》2008年第4期422-428,共7页Journal of Vibration Engineering

摘　　要：根据矩形薄板横向弯曲振动理论,建立了气动式振动台的力学分析模型,采用基于薄板系统最小势能原理的能量法(Rayleigh-Ritz法)分析和计算了振动台面的固有频率和归一化条件下的正则振型。在弹性薄板传统动力学理论分析的基础上,考虑到实际气动式振动台复杂的激励载荷——9个不同位置处气锤产生的周期性激励信号,通过推导振动台面气锤安装位置(输入)与响应位置(输出)之间的传递函数,进一步研究了振动台面的强迫振动响应,通过有限元仿真和实验验证了理论分析的正确性,旨在为整个气动式振动台的性能改善及自主研发奠定理论基础。The dynamic model of repetitive shock machines by the vibration theory of elastic rectangular plates is firstly constructed. Based on the Rayleigh-Ritz method of elastic rectangular plates, the natural frequencies and mode shapes of the vibration table are calculated and analyzed. Furthermore, the complexities of the excitation signals produced by nine vibrators are considered, the transfer functions are deduced between inputs and outputs, and the dynamic responses of vibration table are calculated. Finally the theoretical conclusions are verified by the finite element methods and experiments, and the results of this paper will contribute not only to improve but also to design repetitive shock machines.

关 键 词：气动式振动台 弹性矩形薄板 固有频率 振型 强迫振动响应 

分 类 号：TB123[理学—工程力学] TH692.9[理学—力学]