轨道交通空沟隔振性能试验研究

Experimental study on vibration isolation performance of rail transit

通过室外试验的方法研究空沟深度、宽度、振源距的变化对隔振效果的影响。结果表明:深度、振源距对隔振效果的影响较大,宽度对隔振效果的影响较小。当深度与波长的比值在0. 760~0. 850时,空沟可取得良好的隔振效果,继续增加该比值对隔振效果的增强影响较小。当空沟振源距与波长的比值在1. 520~1. 680时,空沟可达到良好的隔振效果;当该比值大于1. 680时,该比值的增加对增强隔振效果无益。宽度对空沟隔振效果的影响较小,随宽度与波长比值增加,振幅降低比仅仅变化了0. 08左右。

In order to study the influence of the variation of depth,width and vibration source on the vibration isolation effect of the trench,this paper has done a research and established the relationship between the size of the trench and the wavelength of the vibration wave with the railroad transportation with the relative acceleration Aras the test evaluation indicators through the remote area site. And,for the above purposes,we have studied the impact of the variation of the trench parameters on the vibration isolation,so as to arrive at the conclusion beneficial for the actual engineering vibration isolation. The results of our testing experience show that the depth and the distance of the vibration source may have a great effect on the vibration isolation. However,when the ratio reaches a certain level,the distance between the two sources is likely to make little effect on the vibration isolation,though the ratio can be going on increasing,and even lead to enhance the vibration isolation effect,though the width has little effect on the vibration isolation effect. On the other hand,with the increase of the width of the groove,the vibration isolation effect can only change insignificantly. To be exact,when the ratio of the depth to the wavelength is in a range of 0. 760 to 0. 850,the trench can only gain a better effect of the vibration isolation. And,then,with the continuous increase of the ratio of the impact,the vibration isolation effect remains little,though the vibration isolation effect can still be promoted.And,then,when the distance ratio of the vibration source to the wavelength is in the range of 1. 520 to 1. 680,the groove can be made to enhance a perfect vibration isolation effect. And,then,when the ratio is getting to be greater than 1. 680,the increase in the ratio wouldn’t be conducive to enhance its vibration isolation effect. The width has little effect on the vibration isolation effect of the groove. And,then,as the ratio of width to wavelength increases,the change in Armay just have a minute increase,that is,only a small change of about 0. 08.