腐蚀对弧形钢闸门动力特性的影响分析

The Impact of Corrosion of Steel Gate on its Dynamic Behavior

基于流固耦合数值模拟相关理论与方法,利用有限元软件ANSYS12.0,构建了水流-闸门耦合分析的动力计算模型;结合ANSYS的声场分析功能及谐波声场分析准则,计算了各种腐蚀工况下闸门的自振频率并进行了模态扩展,探讨了腐蚀位置、蚀余厚度、腐蚀面积对弧形钢闸门自振频率及其振型形式的影响。动力计算成果分析表明:当面板腐蚀的位置在闸门顶端,或蚀余厚度≤5mm(5、4mm)时,对弧形钢闸门自振频率的影响相对比较明显;腐蚀工况下弧形钢闸门的自振频率偏低,若水流频率偏低时,可能产生共振现象,影响闸门的安全运行。

Based on the theories and methods of fluid-structure coupling numerical simulation ,this paper uses the finite element soft‐ware ANSYS12 .0 to establish the dynamic calculation models of the water-gate coupling structure .Based on ANSYS Mechanical sound field analysis function and harmonic sound field analysis principles ,ANSYS software is used to calculate the gate＆#39;s natural fre‐quencies based on the direct method of ANSYS ,and model expansion is make under different corrosion conditions .The influences of the corrosion factors as corrosion location ,erosion thickness and corrosion area to the gate natural vibration frequency and the vibra‐tion modes are discussed .The dynamic calculation results show that ：when the position of the panel corrosion at the top of the gate , or erosion thickness is equal to 5 mm or 4 mm ,the influence on the gate＆#39;s natural vibration frequency is relatively obvious .All the gate natural vibration frequencies are low under different corrosion conditions .If water frequency is low ,resonance may appear and affect the safe operation of the gate .The research results serve as a reference for the steel gate of its design ,monitoring ,evaluation , operation management ,and so on .