A three-dimensional time-domain potential flow model is developed and applied to simulate the wave resonance in a gap between two side-by-side rectangular barges. A fourth-order predict-correct method is implemented t...A three-dimensional time-domain potential flow model is developed and applied to simulate the wave resonance in a gap between two side-by-side rectangular barges. A fourth-order predict-correct method is implemented to update free surface boundary conditions. The response of an up-wave barge is predicted by solving the motion equation with the Newmark-β method. Following the validation of the developed numerical model for wave radiation and diffraction around two side-by-side barges, the influence of up-wave barge motion on the gap surfaceresonance is investigated in two different locations of the up-wave barge relative to the back-wave barge at various frequencies. The results reveal that the freely floating up-wave barge significantly influences the resonance frequency and the resonance wave amplitude. Simultaneously, the up-wave barge located in the middle of the back-wave barge leads to a reduction in the resonance wave amplitude and motion response when compared with other configurations.展开更多
通过采用水平二维的Boussinesq方程的FUNWAVE-TVD(fully nonlinear wave model with total variation diminishing)数值模型模拟了孤立波在三维珊瑚堡礁附近的波浪传播变形和岸滩爬高。首先通过已有的物理试验对模型进行了验证,随后分...通过采用水平二维的Boussinesq方程的FUNWAVE-TVD(fully nonlinear wave model with total variation diminishing)数值模型模拟了孤立波在三维珊瑚堡礁附近的波浪传播变形和岸滩爬高。首先通过已有的物理试验对模型进行了验证,随后分析了不同珊瑚礁宽度、口门宽度和口门位置对堡礁附近波浪传播变形和爬高的影响。珊瑚礁的存在能够有效减小孤立波的作用,随着珊瑚礁宽度的增加,波高减小得更为迅速,整个环岛的爬高值不断减小,背浪面附近的爬高值很小且存在一定的不稳定性。珊瑚礁对中央岛屿海岸爬高的削弱作用随着珊瑚礁宽度的增加而减小;随着口门宽度的增大,口门附近潟湖内波高增大的范围变大。口门宽度对爬高的影响在中央岛屿迎浪面一定范围内比较显著,随着口门宽度的增大,该范围内中央岛屿迎浪面的爬高增大,最大爬高由双峰向单峰转变,在此范围之外的爬高值几乎不受口门宽度的影响;随着波浪来波方向与口门夹角的增大,口门附近潟湖内孤立波波高增大的范围减小,口门位置的改变仅仅影响岛屿上与口门相接近区域的爬高,这个影响区域随着波浪来波方向与口门夹角的增大向口门后方偏移。展开更多
在数字化与信息化快速发展的背景下,不间断电源(Uninterruptible Power Supply,UPS)广泛应用于众多对供电要求严苛的领域,但其运行产生的谐波问题日益突出。深入剖析UPS谐波产生的原因,涵盖整流装置、非线性负载、电力系统参数及接线方...在数字化与信息化快速发展的背景下,不间断电源(Uninterruptible Power Supply,UPS)广泛应用于众多对供电要求严苛的领域,但其运行产生的谐波问题日益突出。深入剖析UPS谐波产生的原因,涵盖整流装置、非线性负载、电力系统参数及接线方式等,并阐述谐波对设备和电力系统的危害。重点探讨UPS谐波抑制策略,包括应用谐波滤波器、逆变器与整流器设计优化、器件选择与控制、脉冲信号调制,旨在为提升电力系统性能、保障设备稳定运行提供有效策略。展开更多
基金The Research Innovation Foundation of Tianjin Research Institute for Water Transportation Engineering of China under contract No.TKS 170215the Research Foundation of State Key Laboratory of Coastal and Offshore Engineering of Dalian University of Technology of China under contract No.TKS 170215
文摘A three-dimensional time-domain potential flow model is developed and applied to simulate the wave resonance in a gap between two side-by-side rectangular barges. A fourth-order predict-correct method is implemented to update free surface boundary conditions. The response of an up-wave barge is predicted by solving the motion equation with the Newmark-β method. Following the validation of the developed numerical model for wave radiation and diffraction around two side-by-side barges, the influence of up-wave barge motion on the gap surfaceresonance is investigated in two different locations of the up-wave barge relative to the back-wave barge at various frequencies. The results reveal that the freely floating up-wave barge significantly influences the resonance frequency and the resonance wave amplitude. Simultaneously, the up-wave barge located in the middle of the back-wave barge leads to a reduction in the resonance wave amplitude and motion response when compared with other configurations.
文摘通过采用水平二维的Boussinesq方程的FUNWAVE-TVD(fully nonlinear wave model with total variation diminishing)数值模型模拟了孤立波在三维珊瑚堡礁附近的波浪传播变形和岸滩爬高。首先通过已有的物理试验对模型进行了验证,随后分析了不同珊瑚礁宽度、口门宽度和口门位置对堡礁附近波浪传播变形和爬高的影响。珊瑚礁的存在能够有效减小孤立波的作用,随着珊瑚礁宽度的增加,波高减小得更为迅速,整个环岛的爬高值不断减小,背浪面附近的爬高值很小且存在一定的不稳定性。珊瑚礁对中央岛屿海岸爬高的削弱作用随着珊瑚礁宽度的增加而减小;随着口门宽度的增大,口门附近潟湖内波高增大的范围变大。口门宽度对爬高的影响在中央岛屿迎浪面一定范围内比较显著,随着口门宽度的增大,该范围内中央岛屿迎浪面的爬高增大,最大爬高由双峰向单峰转变,在此范围之外的爬高值几乎不受口门宽度的影响;随着波浪来波方向与口门夹角的增大,口门附近潟湖内孤立波波高增大的范围减小,口门位置的改变仅仅影响岛屿上与口门相接近区域的爬高,这个影响区域随着波浪来波方向与口门夹角的增大向口门后方偏移。
文摘在数字化与信息化快速发展的背景下,不间断电源(Uninterruptible Power Supply,UPS)广泛应用于众多对供电要求严苛的领域,但其运行产生的谐波问题日益突出。深入剖析UPS谐波产生的原因,涵盖整流装置、非线性负载、电力系统参数及接线方式等,并阐述谐波对设备和电力系统的危害。重点探讨UPS谐波抑制策略,包括应用谐波滤波器、逆变器与整流器设计优化、器件选择与控制、脉冲信号调制,旨在为提升电力系统性能、保障设备稳定运行提供有效策略。
