泄洪底孔弧形闸门—闸墩耦合动力特性及支臂优化研究
发布时间：2018-11-22 07:56
【摘要】：水工弧形闸门是重要的挡水和泄水建筑物，其安全对整个枢纽至关重要。但由于闸门属于薄壁轻质结构，在动水荷载下容易发生振动，对闸门动力特性的研究显得十分必要。闸门面板承受动水荷载作用，然后通过支臂和支铰将水压力传给闸墩，所以闸门振动要受到水体和闸墩的影响。而且，闸后不同泄流条件，如淹没出流和自由出流，闸门振动响应又不尽相同，所以闸门振动是复杂的流激振动问题。物理模型试验和数值计算结果可以对比验证，确保两者的正确性，所以试验和数模相结合是一种研究闸门振动的有效方法。 本文结合澜沧江里底水电站泄洪底孔弧形工作闸门，通过试验和数值计算对其流激振动特性进行了研究，并进行支臂优化设计。主要研究内容如下： (1)根据模型试验原理和要求，选择合适水弹性材料，按一定的几何比尺设计了闸门水力学和水弹性模型，进行了闸门荷载量测和流激振动响应试验，并分析试验结果。 (2)利用ANSYS建立水体-闸门-闸墩耦合数值模型，将物理模型试验结果与数值计算结果进行了对比，验证了两种方法的正确性，然后与不考虑水体的闸门-闸墩耦合数值模型以及闸墩刚性处理的数值模型的计算结果进行对比，分析了闸墩和水体各自对闸门振动的影响。 (3)通过不同淹没度以及自由出流泄流条件下的水弹性模型试验，研究了闸后淹没出流和自由出流时闸门闸墩的流激振动响应特性。 (4)通过不同支臂型式闸门的动、静力分析，研究了支臂间斜、横向连接系对支臂静、动力特性的影响。最后，通过对比确定了一种支臂优化型式，既满足静力和动力稳定要求，又适当降低了闸门制作和运行成本。
[Abstract]:The hydraulic arc gate is an important water retaining and discharging structure, and its safety is very important to the whole hinge. But because the gate belongs to thin wall light structure, it is easy to vibrate under the dynamic water load, so it is necessary to study the dynamic characteristics of the gate. The gate face plate is subjected to dynamic water load, and then the water pressure is transmitted to the pier through the supporting arm and hinge, so the vibration of the gate is affected by the water body and the pier. Moreover, the vibration response of the gate is different under different discharge conditions, such as submerged discharge and free discharge, so the gate vibration is a complicated fluid-induced vibration problem. The results of physical model test and numerical calculation can be compared and verified to ensure the correctness of the two methods, so the combination of test and numerical simulation is an effective method to study the vibration of gate. In this paper, the fluid-induced vibration characteristics of the flood-releasing bottom hole of Lancang River Lidy Hydropower Station are studied by means of experiments and numerical calculations, and the optimum design of the supporting arm is carried out. The main research contents are as follows: (1) according to the principles and requirements of the model test, the hydraulic and hydroelastic models of the gate are designed according to a certain geometric scale. The tests of gate load measurement and fluid-induced vibration response are carried out, and the test results are analyzed. (2) the coupled numerical model of water body, gate and pier is established by using ANSYS. The results of physical model test and numerical calculation are compared, and the correctness of the two methods is verified. Then, compared with the numerical model of sluice-pier coupling without considering water and the numerical model of pier rigidity treatment, the effects of pier and water on gate vibration are analyzed. (3) through the hydroelastic model tests under different submergence degrees and free discharge conditions, the fluid-induced vibration response characteristics of gate piers under submerged discharge and free discharge are studied. (4) through the dynamic and static analysis of the gate with different type of arm, the influence of the oblique and transverse connection system on the static and dynamic characteristics of the arm is studied. Finally, an optimal type of arm is determined by comparison, which not only meets the requirements of static and dynamic stability, but also reduces the production and operation cost of the gate properly.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV663.2
本文编号：2348591
[Abstract]:The hydraulic arc gate is an important water retaining and discharging structure, and its safety is very important to the whole hinge. But because the gate belongs to thin wall light structure, it is easy to vibrate under the dynamic water load, so it is necessary to study the dynamic characteristics of the gate. The gate face plate is subjected to dynamic water load, and then the water pressure is transmitted to the pier through the supporting arm and hinge, so the vibration of the gate is affected by the water body and the pier. Moreover, the vibration response of the gate is different under different discharge conditions, such as submerged discharge and free discharge, so the gate vibration is a complicated fluid-induced vibration problem. The results of physical model test and numerical calculation can be compared and verified to ensure the correctness of the two methods, so the combination of test and numerical simulation is an effective method to study the vibration of gate. In this paper, the fluid-induced vibration characteristics of the flood-releasing bottom hole of Lancang River Lidy Hydropower Station are studied by means of experiments and numerical calculations, and the optimum design of the supporting arm is carried out. The main research contents are as follows: (1) according to the principles and requirements of the model test, the hydraulic and hydroelastic models of the gate are designed according to a certain geometric scale. The tests of gate load measurement and fluid-induced vibration response are carried out, and the test results are analyzed. (2) the coupled numerical model of water body, gate and pier is established by using ANSYS. The results of physical model test and numerical calculation are compared, and the correctness of the two methods is verified. Then, compared with the numerical model of sluice-pier coupling without considering water and the numerical model of pier rigidity treatment, the effects of pier and water on gate vibration are analyzed. (3) through the hydroelastic model tests under different submergence degrees and free discharge conditions, the fluid-induced vibration response characteristics of gate piers under submerged discharge and free discharge are studied. (4) through the dynamic and static analysis of the gate with different type of arm, the influence of the oblique and transverse connection system on the static and dynamic characteristics of the arm is studied. Finally, an optimal type of arm is determined by comparison, which not only meets the requirements of static and dynamic stability, but also reduces the production and operation cost of the gate properly.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV663.2
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