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首页> 外文期刊>Marine Structures >Investigation on the nonlinear effects of the vertical motions and vertical bending moment for a wave-piercing tumblehome vessel based on a hydro-elastic segmented model test
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Investigation on the nonlinear effects of the vertical motions and vertical bending moment for a wave-piercing tumblehome vessel based on a hydro-elastic segmented model test

机译：基于水力弹性分段模型试验的垂直运动对垂直运动和垂直弯矩的非线性效应的研究

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摘要

Although the nonlinear effects of the ship motions, wave-induced loads and structural responses of conventional vessels have been investigated experimentally and numerically in recent years, similar studies on the wave-piercing tumblehome (WPTH) vessels are rare, in spite of the urgent necessary due to their extensive applications. This paper experimentally investigated the nonlinear effects of the vertical motions and vertical bending moment (VBM) for a WPTH vessel based on a hydro-elastic segmented model test. The model test was carried out in head regular waves for three amplitudes, in the towing tank at Harbin Engineering University. Based on the band-pass filter technique, four kinds of decomposed harmonics are defined by mean offset, linear wave-frequency response, nonlinear wave-frequency response and nonlinear high-frequency vibration. Meanwhile, based on mean offset, three kinds of combined responses are defined by considering linear wave-frequency response, nonlinear wave-frequency response and nonlinear high-frequency vibrations step by step. The transfer functions of vertical motions and VBM are presented as function of the incident wave frequency, and the measured data and VBM were compared with numerical calculations for validation. With the method proposed above, the results of VBM are analyzed by focusing on the influences of decomposed harmonics on the amplitudes and asymmetry of combined responses. Strong nonlinear effects are observed in the VBM. The nonlinearity of VBM can be identified by the significant amplitudes of decomposed harmonics, variation of amplitude with the wave amplitude and remarkable asymmetry about the zero axis. The hogging VBM of WPTH vessel can be even larger than the sagging VBM, which is in contrast to the general experiences from conventional vessels. Combined the calculated relative motion with the decomposed and combined histories of VBM, the occurrence of the transient impact and its characteristics are discussed, and these are then used to analyze the unconventional asymmetry of VBM. Furthermore, the influences of the bow shape over the vertical motions and VBM are discussed. At the end of the paper, the uncertainties in the test are provided.
机译：尽管船舶运动的非线性效应，近年来已经在实验和数值上进行了对常规血管的载波和结构反应进行了研究，但是由于迫切需要，对波刺穿的滚石组（WPTH）血管的类似研究是罕见的由于他们广泛的应用程序。本文基于水力弹性分段模型试验实验研究了WPTH血管的垂直运动和垂直弯矩（VBM）的非线性效应。在哈尔滨工程大学的牵引箱中，在三个振荡中进行模型试验。基于带通滤波器技术，通过平均偏移，线性波频响应，非线性波频响应和非线性高频振动来定义四种分解谐波。同时，基于平均偏移，通过考虑线性波频响应，非线性波频响应和非线性高频振动来限定三种组合响应。垂直运动和VBM的传递函数作为入射波频率的函数呈现，并将测量的数据和VBM与数值计算进行了比较了验证。利用上述方法，通过专注于分解谐波对组合反应的振幅和不对称性的影响，分析VBM的结果。在VBM中观察到强烈的非线性效应。 VBM的非线性可以通过分解谐波的显着幅度来识别，振幅的变化与波幅的变化和距零轴的显着不对称。 WPTH血管的摇动VBM可以比下垂的VBM大，这与传统血管的一般经验相反。将计算的相对运动与VBM的分解和组合历史组合，讨论了瞬态撞击的发生及其特征，然后用于分析VBM的非传统不对称性。此外，讨论了弓形在垂直运动和VBM上的影响。在纸张结束时，提供了测试中的不确定性。

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