基于ANSYS的平面闸门流固耦合振动特性的有限元分析
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摘要
应用有限元振动分析方法对我国新疆某大型农业水利工程倒虹吸出口平面闸门的固有振动特性进行计算与分析。建立了平面闸门的实体模型和有限元模型,考虑流固耦合对闸门结构动态特性的影响,分析了平面闸门在无水和有水状态下的动态特性,计算得到闸门的前6阶固有频率及其振型。结果表明,闸门开度对其自振频率有着显著影响,在小开度时第1阶固有频率下降达到28.5%,沿竖直方向的整体振动的模态频率接近20 Hz,因此,为了提高闸门的第1阶固有频率,必须对闸门结构进行改进。
Against the background of the vibration problem of the plane gate in the inverted siphon exit of the large-scale hydraulic project in Northern Xinjiang,the natural vibration characteristic of the plane gate was studied using ANSYS.The entity model and finite element model were built.With the fluid-solid coupling,the natural characteristics of the gate with or without water condition were analyzed.The first six natural frequencies and their vibration modal shapes of the gates were calculated.The result showed that the water height has a significant impact on the natural frequencies of the plane gate,the first natural frequency was reduced to 28.5% and the structure of the plane gate must be improved.
Against the background of the vibration problem of the plane gate in the inverted siphon exit of the large-scale hydraulic project in Northern Xinjiang,the natural vibration characteristic of the plane gate was studied using ANSYS.The entity model and finite element model were built.With the fluid-solid coupling,the natural characteristics of the gate with or without water condition were analyzed.The first six natural frequencies and their vibration modal shapes of the gates were calculated.The result showed that the water height has a significant impact on the natural frequencies of the plane gate,the first natural frequency was reduced to 28.5% and the structure of the plane gate must be improved.
引文
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[2]古华,严根华.水工闸门流固耦合自振特性数值分析[J].振动、测试与诊断,2008,28(3):241-246.
[3]杨吉新,张可,党慧慧.基于ANSYS的流固耦合动力分析方法[J].船海工程,2008,37(6):86-89.
[4]谢智雄,贺高年,黄峻,等.大跨度平面闸门的自振特性研究[J].中国农村水利水电,2006(6):69-72.
[5]傅志方,华宏星.模态分析理论与应用[M].上海:上海交通大学出版社,2009.
[6]曹树谦,张文德,萧龙翔.振动结构模态分析——理论、实验与应用[M].天津:天津大学出版社,2001.
[7]居荣初,曾心传.弹性结构与液体的耦联振动理论[M].北京:地震出版社,1983.
[8]徐振东,杜丽惠,才君眉.平面闸门流固耦合自振特性研究[J].水力发电,2001(4):39-43.
[9]梁权伟,王正伟,方源.考虑流固耦合的混流式水轮机转轮模态分析[J].水力发电学报,2004,23(3):116-120.
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