激振机悬挂安装方式对被激结构振动的影响分析与试验

Analysis and Experimental Research on the Influence of Suspended Excitation to the Excited Structure Vibration

以单自由度系统模型对激振机通过柔性驱动杆传递到结构上的激振力和通过弹性部件传递到结构上的扰动力进行分析比较,得出激振机附连在被激结构上对被激结构产生影响的工作机理。采用试验和数值模拟的方法,探讨激振机悬挂激振方式的频率适用范围以及在自由悬挂结构激振试验中的可行性。结果表明,当激振机最低工作频率高于安装频率3～4倍时,可以采用悬挂安装方式,且激振频率离安装频率越远,扰动力的影响就越小,但当激振机最低工作频率在安装频率以下频段时,便不能采用悬挂安装方式。

In this paper,a single-degree-of-freedom system is adopted to analyze and compare the excit ing force passing through a flexible driving rod with the disturbance force passing through the elastic mem ber.Particularly,the mechanism of how the attached structure influences the excited object is investigated.Both experiments and numerical simulation are conducted to determine the frequency range of the exciter and the applicability of a suspended excitation for a structure in free suspension.The results show that when the lowest operating frequency of the exciter is 3 to 4 times higher than the inherent mounted frequen cy,the suspended excitation is feasible,and the higher the excited frequency,the lower the influence from the disturbance force.On the contrary,when the excited frequency is lower than the inherent mounted frequency,the suspended excitation is no longer appropriate.