激振频率对矩形沟槽隔振效果的影响研究

Research on the Effect of Excitation Frequency on the Vibration Isolation Effect of Rectangular Groove

为了研究不同频率条件下矩形沟槽对沟槽附近区域隔振效果的影响,通过现场试验测试矩形沟槽附近区域的加速度幅值,以振幅降低比为隔振效果的评价指标,并绘制了振幅降低比的二维平面等值线图;研究结果表明:振动波在传播过程中遇到矩形沟槽时,在沟槽前后的振动强度会产生变化,沟前区域的振动强度显著增大,而沟后区域的振动强度明显降低;与低频振动相比,矩形沟槽对于高频振动的隔振效果更加显著;在沟后区域,矩形沟槽对于近距离区域的隔振效果较好,随着传播距离的增加隔振效果越来越差。

In order to study the influence of the rectangular groove on the vibration isolation effect in the vicinity of the groove under different frequency conditions,the acceleration amplitude of the area near the rectangular groove was tested through field tests.The amplitude reduction ratio was used as the evaluation index of the vibration isolation effect,the amplitude was plotted,and the two-dimensional plane contour map of the reduction ratio was drawn.The research results show that,when the vibration wave encounters a rectangular groove during propagation,the vibration intensity before and after the groove will change,and the vibration intensity in the area in front of the groove increases significantly,and the vibration intensity of the area behind the groove is significantly reduced.Compared with low-frequency vibration,the rectangular groove is more effective in isolating high-frequency vibrations;in the area behind the groove,the rectangular groove is better for close-range vibration isolation.As the propagation distance increases,the vibration isolation effect becomes worse and worse.