环形沟槽几何参数对隔振区域影响的试验研究

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (20) : 266-274.

论文

刘晶磊1,2，于川情1,2，刘杰1,2

作者信息 +

A test study on the influence of geometric parameters of annular trench on vibration isolation area

LIU Jinglei1,2, YU Chuanqing1,2, LIU Jie1,2

Author information +

文章历史 +

摘要

为了研究环形沟槽深度、宽度及其振源距离等几何参数对隔振区域的影响，通过进行环形沟槽隔振的室外试验，绘制振幅降低比的等值线图，以振幅降低比不大于0.35的区域作为有效隔振区域的评价指标，将上述几何参数对有效隔振区域的影响进行分析。结果表明：环形沟槽的深度、宽度、振源距离及其圆心角均会对有效隔振区域产生不同程度的影响。沟槽深度与瑞利波波长的比值为0.54~0.77、沟槽宽度与瑞利波波长的比值为0.23~0.33、振源距离与瑞利波波长的比值为1.18~1.52时，环形沟槽可以取得良好的有效隔振区域面积；在本试验条件下继续增大各参数的比值对增大有效隔振区域无益。环形沟槽圆心角是影响有效隔振区域面积的重要因素，增大圆心角可显著增大有效隔振区域的面积；沟槽圆心角为90º时，隔振区域内将形成不连续的有效隔振区域；沟槽圆心角选取与频率有关，达到同等大小的有效隔振区域，沟槽圆心角随频率的减小而增大。

Abstract

In order to study influences of geometric parameters such as depth, width, and distance of an annular trench on a vibration isolation area, an outdoor test of the annular trench was carried out, and the contour map of the amplitude reduction ratio was drawn.The area with the amplitude reduction ratio of not more than 0.35 was used as the evaluation index of the effective vibration isolation area, and the influence of the above geometric parameters on the effective vibration isolation area was analyzed.The results show that the depth of the trench, width of the trench, the distance from trench to the vibration source and center angle of the trench have different effects on the effective vibration isolation area.When the ratio of the trench depth to Rayleigh wave length is 0.54-0.77, the ratio of trench width to Rayleigh wave length is 0.23-0.33, and the ratio of the distance from the trench to the vibration source to Rayleigh wave length is 1.18-1.52, a good effective vibration isolation area of annular trench can be obtained.Under the conditions of this test, continuously increasing the ratio of each parameter is not beneficial to enlarge the effective vibration isolation area.The central angle of the annular trench is an important factor affecting the effective vibration isolation area.Increasing the angle can obviously enlarge the area of the effective vibration isolation area.When the angle is 90, a discontinuous effective isolation area will be formed in the isolation area.The selection of the angle is related to the frequency, when the effective isolation area of the same size is achieved, and the angle increases with the decrease of the frequency.

导出引用

刘晶磊1,2，于川情1,2，刘杰1,2. 环形沟槽几何参数对隔振区域影响的试验研究[J]. 振动与冲击, 2019, 38(20): 266-274

LIU Jinglei1,2, YU Chuanqing1,2, LIU Jie1,2. A test study on the influence of geometric parameters of annular trench on vibration isolation area[J]. Journal of Vibration and Shock, 2019, 38(20): 266-274

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