Pitch and Heave Tests and Uncertainty Assessment for a Surface Combatant in Regular Head Waves
Pitch and Heave Tests and Uncertainty Assessment for a Surface Combatant in Regular Head Waves
复制标题
DOI：
10.5957/jsr.2008.52.2.146
复制
发表时间：
2008-06
影响因子：
1.4
通讯作者：
M. Irvine
中科院分区：
文献类型：
--
作者：
M. Irvine
本文介绍了水面战斗舰在规则首波中前进时纵摇与垂荡耦合运动的拖曳水池实验。这些数据包括压载参数、时间历程、快速傅立叶变换（FFT）、傅立叶级数振幅、纵摇和垂荡传递函数以及速度、波陡和波频率范围内的相位。几何形状为大卫泰勒模型盆地（DTMB）模型5512，是DTMB模型5415（DDG-51）的1/46.6比例尺geosim，L PP = 3.048 m。实验是在一个3.048 × 3.048 × 100米的拖曳水池中进行的，该水池配备有柱塞式造波机。该测试计划是为了提供一个验证数据集的非定常雷诺平均Navier-Stokes方程和其他计算流体动力学（CFD）代码，包括严格的不确定性评估的实验结果后，标准程序。结果表明，规则首波与二阶和三阶振幅呈线性关系，与三阶Stokes波一致。纵摇和垂荡响应和相位显示出长波长和短波长的预期趋势，并且在所有测试条件下均为线性或Ak独立。当遭遇频率等于纵摇和垂荡固有频率且L PP / λ = 0.75时，出现最大响应。在这些条件下，推导出一个方程，预测弗劳德数的最大响应作为船舶几何系数的函数。
Towing-tank experiments of coupled pitch and heave motions are presented for a surface combatant advancing in regular head waves. The data include ballasting parameters, time histories, fast Fourier transform (FFT), Fourier series amplitudes, and pitch and heave transfer functions and phases for a range of speeds, wave steepnesses, and wave frequencies. The geometry is David Taylor Model Basin (DTMB) model 5512, which is a 1/46.6 scale geosim of DTMB model 5415 (DDG-51) with L PP = 3.048 m. The experiments are performed in a 3.048 x 3.048 x 100 m towing tank equipped with a plunger-type wave maker. The test program is undertaken to provide a validation data set for unsteady Reynolds-averaged Navier-Stokes and other computational fluid dynamics (CFD) codes, including rigorous uncertainty assessment of the experimental results following standard procedures. Results indicate that the regular head waves are linear with second- and third-order magnitudes consistent with third-order Stokes waves. Pitch and heave responses and phases show expected trends for long and short wavelengths and are linear or Ak independent for all test conditions. Maximum response occurs for frequency of encounter equal to pitch and heave natural frequencies and L PP / λ = 0.75. Under these conditions, an equation is derived that predicts the Froude number for maximum response as a function of ship geometrical coefficients.