基于结构声强的水电站厂房振动传递路径研究

Research on transfer path of vibrations of hydropower house based on structural intensity

基于结构声强理论对ANSYS进行二次开发,实现了水电站厂房结构声强计算及矢量可视化。以一大型水电站坝后式厂房为研究对象,对其在机墩垂直动荷载和尾水脉动荷载分别作用下的结构声强进行了计算和分析。根据厂房立柱、楼板和风罩等部位的结构声强值和矢量图得到了该电站厂房结构振动的主要传递路径。研究结果表明,该厂房振动传递的主路径为:振动通过机墩或蜗壳外围混凝土结构传递到柱梁和风罩,再传到发电机层楼板;振动通过尾水管传递到蜗壳外围混凝土,然后传到机敦,接着传到风罩、柱子和梁,再传到发电机层楼板。结构振动传递路径可为水电站厂房结构优化设计和减振提供技术支持。

Based on the theory of structural intensity, numerical calculation and vector visualization of struc- tural intensity of hydropower houses were realized with the re-development ANSYS. Using the method, the structural intensity of a large scale hydropower house at dam-toe was calculated and analyzed under the ac- tion of vertical load of unit foundation or pressure pulsation in the draft tube. According to the results of the columns, floors and fan house, the transfer paths of vibration were revealed. One main path is that the vibration can be transferred from the unit foundation or the concrete structure of spiral case to the col- umns, beams and fan house, then to the generator floor. The other main path is that the vibration can be transferred from the draft tube to the concrete structure of spiral case, then to the unit foundation, and then to the columns, beams and fan house, and then to the generator floor. The transfer paths of vibration can be used for the optimal design and vibration reduction of hydropower houses.