基于点源（汇）附加质量法的平面闸门流固耦合振动特性研究

发布时间：2018-08-28 17:41

【摘要】：平面闸门在水利水电工程中是应用最早及最广泛的闸门形式之一。平面闸门在复杂的工程条件下因其结构问题,使其在工程运用中存在着诸多安全稳定性问题。闸门本身有自振,在启闭过程或是局部开启时,由于闸门与水之间流固耦合的作用,常常产生更为激烈的振动,振动严重时可能会引起闸门的振动破坏。因此无论是对平面闸门结构进行自振特性试验研究,还是考虑流固耦合效应对闸门振动特性的影响进行数值分析研究,都具有十分重要的工程价值和理论意义。在实际工程应用中,通常对流固耦合作用问题的力学模型进行简化,作一些必要的假设,从而将流体对结构的作用以附加质量的形式表达出来。本文从结构振动入手,以利用空间点源(汇)和偶极子基本解推导的三维结构振动诱导流场附加质量的计算式,推导出平面闸门在静水中由于自振诱导的附加质量的计算公式。并通过有限元分析软件ANSYS自带的多流场耦合分析模块对该计算公式的工程合理性与准确性进行验证。通过有限元分析软件ANSYS建立平面闸门模型,先求得平板闸门的自振特性。然后通过附加质量计算式求得平面闸门在静水中的附加质量,以此求得平面闸门在流固耦合作用下的振动特性。同时对平面闸门全关状态下不考虑侧向约束无水、不考虑侧向约束有水、考虑侧向约束无水、考虑侧向约束有水,以及闸门开度分别为0.1、0.2、0.3、0.5、0.7、0.9等工作状况下的振动特性一一求出。通过各种工况下平面闸门自振特性的对比分析,得出平面闸门在静水中时流固耦合效应对其振动特性的影响。以及侧向约束对闸门振动特性的影响。然后通过对比分析平面闸门在开度为0.1、0.2、0.3、0.5、0.7、0.9时的振动特性,总结分析出闸门开度对平面闸门振动特性的影响。
[Abstract]:Plane gate is one of the earliest and most widely used gate forms in water conservancy and hydropower projects. Due to the structural problems of plane gate in complex engineering conditions, there are many safety and stability problems in its application. The gate itself has its own vibration. During the opening and closing process or local opening, the vibration of the gate is often more intense due to the fluid-solid coupling between the gate and the water, which may lead to the vibration damage of the gate when the vibration is serious. Therefore, it is of great engineering value and theoretical significance to study the natural vibration characteristics of the plane gate structure and to analyze the effect of fluid-solid coupling effect on the vibration characteristics of the gate. In practical engineering application, the mechanical model of the convection-solid coupling problem is usually simplified and some necessary assumptions are made to express the effect of fluid on the structure in the form of additional mass. In this paper, starting with the structural vibration, the formula for calculating the additional mass of the three-dimensional structure induced by vibration is derived by using the basic solution of the spatial point source and the dipole, and the formula for calculating the additional mass of the plane gate induced by the natural vibration in the hydrostatic water is derived. The engineering rationality and accuracy of the formula are verified by the multi-flow field coupling analysis module of the finite element analysis software ANSYS. The plane gate model is established by the finite element analysis software ANSYS, and the natural vibration characteristics of the flat gate are obtained first. Then the additional mass of the plane gate in the static water is obtained by calculating the additional mass, and the vibration characteristics of the plane gate under the fluid-solid coupling are obtained. At the same time, the vibration characteristics of the plane gate under the condition of full closure without considering the lateral constraint, with the lateral constraint being considered, and the opening degree of the gate being 0.20.20.30.50.50.70.9, respectively, are calculated one by one. Through the comparative analysis of the natural vibration characteristics of plane gate under various working conditions, the influence of fluid-solid coupling effect on the vibration characteristics of plane gate in still water is obtained. And the influence of lateral constraint on the vibration characteristics of the gate. Then, the vibration characteristics of plane gate are analyzed when the opening degree of plane gate is 0.1g / 0.2U 0.30.50.70.0.The influence of gate opening on the vibration characteristic of plane gate is summarized and analyzed.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV663

【参考文献】