Pressure induced by vertical planar and inclined curved weir-plates undergoing streamwise rotational vibration
Pressure induced by vertical planar and inclined curved weir-plates undergoing streamwise rotational vibration
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DOI：
10.1016/j.jfluidstructs.2011.11.007
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发表时间：
2012-02-01
影响因子：
3.6
通讯作者：
Knisely, C. W.
中科院分区：
文献类型：
--
作者：
Anami, K.;Ishii, N.;Knisely, C. W.
通过对其中一个剩余的福尔松大坝闸门的失效后模态分析，识别出了一种包括绕沿沿着堰板表面的水平旋转轴的旋转振动的Tainter闸门面板的流向弯曲振动模式。闸门面板的这种模态偏转推动和吸引水库中的水，引起流体动力压力波动（称为推拉压力）。为了分析这种推拉压力，制定了简化的分析模型。该模型包括一个刚性的，垂直的，平面堰板进行旋转振动，其水平旋转轴沿着堰板表面上的水平床与一个垂直的步骤，在门的位置。从理论分析（基于耗散波辐射理论）的结果中提出的无量纲参数，如弗劳德数和减少的高度的skinplate旋转中心。为了将理论模型推广到圆弧形面板上，对上游侧有垂直台阶的弯曲坝顶上方受迫振动的倾斜圆弧形面板进行了压力测量。根据这些测量结果，对分析进行了经验修正，以说明闸门和坝顶的曲面。将淹没的蒙皮表面区域上的压力载荷进行积分，可以确定蒙皮上的流体动力载荷。作为这项研究的结果，已经开发了一种方法，用于估计由于流向振动的压力波动的任何蒙皮进行流向旋转振动。该方法被用来估计圆弧蒙皮上的载荷作为一个功能的约化振幅和弗劳德数。(C)2012由Elsevier Ltd.出版
A streamwise bending vibration mode of a Tainter gate skinplate involving rotational vibration about a horizontal rotational axis along the weir-plate surface was identified through post-failure modal analysis on one of the remaining Folsom dam gates. This modal deflection of the skinplate of a gate pushes and draws the water in the reservoir inducing hydrodynamic pressure fluctuations (termed the push-and-draw pressure). To analyze this push-and-draw pressure, a simplified analytical model was formulated. The model consisted of a rigid, vertical, flat weir-plate undergoing rotational vibration with its horizontal rotational axis along the weir-plate surface above a horizontal bed with a vertical step down at the gate position. Results from the theoretical analysis (based on dissipative wave radiation theory) are presented in terms of non-dimensional parameters, such as the Froude number and a reduced height of the skinplate rotation center. The validity of the analysis was confirmed by forced vibration experiments using a rigid, vertical, flat weir-plate.To extend the theoretical model to loading on circular-arc skinplates, pressure measurements were made on an inclined circular-arc skinplate undergoing forced vibration above a curved dam crest with a vertical step down on the upstream side. From these measurements, an empirical correction to the analysis was developed to account for the curved surfaces of both the gate and the dam crest. Integrating the pressure loading over the submerged skinplate surface area permitted the determination of the hydrodynamic load on the skinplate. As a result of this study, a method has been developed for estimating the pressure fluctuation due to streamwise vibration on any skinplate undergoing streamwise rotational vibration. The method was used to estimate the loading on a circular arc skinplate as a function of the reduced vibration amplitude and the Froude number. (C) 2012 Published by Elsevier Ltd.