A comprehensive experimental assessment of vertical motions and accelerations of two Naples warped hard chine hulls systematic series (NSS) hulls in regular waves is presented. The seakeeping performance in regular waves are investigated, in particular nonlinear motion responses in terms of transfer functions and higher harmonic response as a function of wave frequency, steepness, hull slenderness and speed. In order to highlight the effects of wave properties on motion responses, transfer functions of both motion harmonics and phases are presented via iso-frequency and iso-steepness plots. Slenderness ratio is found to have a notable effect on motion transfer functions only at higher speeds. The presence of a higher harmonics in motion and acceleration response is also observed and the proposed analysis shows that increasing wave steepness and speed lead to increased higher harmonics responses of both vertical motions and accelerations. The effect of slenderness ratio on the second harmonic response of heave and pitch is only noticeable at higher speed. Phase difference between wave and motions shows that higher second harmonic content is generally associated with a higher phase lead. The main novelty of the present work is represented by the extensive analysis of NSS planing hulls in regular waves. In particular the aspects concerning higher harmonics and their trends with respect to speed, wave and hull geometrical characteristics.

提出了在垂直方向上对两个那不勒斯扭曲硬脊椎船体系统系列（NSS）船体的垂直运动和加速度进行的综合实验评估。研究了规则波的航海性能，特别是根据传递函数和高次谐波响应的非线性运动响应，这些响应是波频率，陡度，船体细长度和速度的函数。为了突出波动特性对运动响应的影响，通过等频图和等陡度图给出了运动谐波和相位的传递函数。发现细长比仅在较高速度下才对运动传递功能有显着影响。还观察到运动和加速度响应中存在较高的谐波，并且所提出的分析表明，增加的波陡度和速度会导致垂直运动和加速度的较高谐波响应均增加。细长比对升沉和俯仰的二次谐波响应的影响只有在较高速度下才明显。波动与运动之间的相位差表明，较高的二次谐波含量通常与较高的相位超前有关。当前工作的主要新颖之处在于对NSS平面船体在规则波浪中的广泛分析。特别是有关高次谐波的方面及其在速度，波浪和船体几何特性方面的趋势。细长比对升沉和俯仰的二次谐波响应的影响只有在较高速度下才明显。波动与运动之间的相位差表明，较高的二次谐波含量通常与较高的相位超前有关。当前工作的主要新颖之处在于对NSS平面船体在规则波浪中的广泛分析。特别是有关高次谐波的方面及其在速度，波浪和船体几何特性方面的趋势。细长比对升沉和俯仰的二次谐波响应的影响只有在较高速度下才明显。波动与运动之间的相位差表明，较高的二次谐波含量通常与较高的相位超前有关。当前工作的主要新颖之处在于对NSS平面船体在规则波浪中的广泛分析。特别是有关高次谐波的方面及其在速度，波浪和船体几何特性方面的趋势。当前工作的主要新颖之处在于对NSS平面船体在规则波浪中的广泛分析。特别是有关高次谐波的方面及其在速度，波浪和船体几何特性方面的趋势。当前工作的主要新颖之处在于对NSS平面船体在规则波浪中的广泛分析。特别是有关高次谐波的方面及其在速度，波浪和船体几何特性方面的趋势。