下卧式弧形闸门启闭力计算及自振特性研究

Calculation of opening and closing force and research on natural vibration characteristics of lower horizontal radial gate

下卧式弧形闸门作为一类新型闸门,其支臂形式、启闭情况及挡水时约束方式均与传统的弧形闸门有较大差异,为选出合适的启闭机类型,研究了其在运行过程中的最大启闭力及所处位置。此外,考虑到闸门约束的差异性,闸门在挡水运行过程中可能出现共振失稳破坏,采用有限元分析软件ANSYS建立闸门有限元模型,并利用模态分析模块,考虑流固耦合的作用,对闸门进行自振特性分析。研究结果表明:闸门运行至挡水位置时,启闭力达到最大值1472 kN;自振频率随着水头的增大而减小,致使诱发共振的风险增大,但基频均在脉动水流优势集中区外,正常情况下诱发共振的风险不大。

As a new type of gate,the lower horizontal radial gate has a great difference with the traditional radial gate in support arm form,opening and closing conditions and restraint methods when blocking water.In order to select a suitable type of hoist,it is necessary to explore the maximum opening and closing force and its position in the operation process.In addition,considering the difference of the gate constraints,the resonance instability may occur during the water retaining operation process.Therefore,the finite element analysis software ANSYS was used to establish the finite element model of the gate,and the modal analysis module was used to analyze the natural vibration characteristics of the gate considering the effect of fluid-solid coupling.The research results show that when the gate moves to its water-retaining position,the opening and closing force reaches the maximum value of 1472 kN;the natural frequency decreases with the increase of the water head,which increases the risk of induces resonance.However,the fundamental frequency is outside the dominant concentration area of pulsating water flow,and the risk of resonance is not obvious under normal conditions.