结合某水电站地面明钢管实际工程，采用有限单元法研究了管内脉动压力作用下明钢管斜直段后段采用垫层管形式对钢管振动的影响。结果表明：采用垫层管形式可分散明钢管低频段的各阶自振频率，并使铅直向与上下游方向上具有较高有效模态质量的自振频率得到提高。垫层管形式对低频脉动下明钢管斜直段具有明显的减振效果，但不利于高频脉动下的钢管抗振；在低频脉动压力作用下通过减小垫层管垫层包角到一定值可以进一步提高减振效果。
Abstract
The steel penstock encircled by cushion layer can be used at the end of the inclined straight segment in aboveground exposed steel penstock. The effect of this measure on the vibration response of penstock under fluctuating pressures was analyzed with the finite element method for a hydropower station. The results show that the natural vibration frequencies of the exposed steel penstock become scattered in low frequency region, and the natural vibration frequencies with high effective mode mass in the vertical and horizontal direction are raised. The measure is beneficial to the vibration reduction of the exposed steel penstock under fluctuating pressures with low frequencies but disadvantageous to the structural vibration control under fluctuating pressures with high frequencies; the vibration reduction effect under fluctuating pressures with low frequencies can be further improved by optimizing the covering range of cushion layer.
关键词
明钢管 /
垫层管 /
自振频率 /
有效模态质量 /
脉动压力 /
减振
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Key words
exposed steel penstock /
steel penstock encircled by cushion layer /
natural vibration frequency /
effective mode mass /
fluctuating pressure /
vibration reduction
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