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首页> 外文会议>Advances in maritime and naval science and engineering >EVALUATION OF EFECTIVE FORCES ON PERFORATED-BALL VELOCITY METER (PVM) USING INVERSE PROBLEM OF MORISON EQUATION IN LARGE SCALE
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EVALUATION OF EFECTIVE FORCES ON PERFORATED-BALL VELOCITY METER (PVM) USING INVERSE PROBLEM OF MORISON EQUATION IN LARGE SCALE

机译：利用大尺寸莫里森方程反问题评估球速计（PVM）的有效力

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摘要

Due to random nature of ocean waves, determination of hydrodynamic forces on steel platforms generated by waves is quite complicated. The role of mathematical-empirical models in evaluation of wave forces on cylindrical elements of platforms is crucial. One such model is the Morrison's equation. A Perforated-ball Velocity Meter (PVM) device measures the wave induced forces on a cantilevered ball-tube assembly and the wave kinematics is computed from these forces by solution of an inverse problem given by the Morrison's equation. The drag and inertia coefficient of ball is used in the inverse Morison problem. The behavior and convergence of the numerical scheme for this inverse problem has been studied in detail. In the present paper, experimental result from large scale models at wave flume Delta of Delft hydraulic Laboratory in Netherlands and forces on Perforated-ball Velocity Meter (PVM) has been used to analyze the determination of water particle kinematics. The measured kinematics have compared with calculated kinematics obtained from the free surface elevation measurements using the inertia wave theory and the Wheeler stretching theory and exhibit with graphs. The comparisons have been satisfactory. It is also shown that the kinematics measured by the PVM can yield the free surface elevation with good accuracy.
机译：由于海浪的随机性，确定由海浪产生的钢平台上的水动力很复杂。数学经验模型在评估平台圆柱单元上的波浪力中的作用至关重要。莫里森方程就是这样一种模型。多孔球速度计（PVM）设备可测量悬臂球管组件上的波浪感应力，并通过解决由Morrison方程给出的反问题，由这些力计算波浪运动学。球的阻力和惯性系数用于莫里森反问题。已经详细研究了该反问题的数值格式的行为和收敛性。本文利用荷兰代尔夫特水利实验室波浪槽三角洲大型模型的实验结果和多孔球速度计（PVM）上的力来分析水颗粒运动学。将测得的运动学与使用惯性波理论和Wheeler拉伸理论从自由表面高程测量获得的计算出的运动学进行了比较，并显示了图表。比较结果令人满意。还显示了通过PVM测量的运动学可以产生具有良好精度的自由表面高程。

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