油船强迫横摇试验及分析研究

采用自制的横摇试验设备和控制系统,进行油船船模在三种横摇幅值下的强迫横摇试验,横摇试验周期为0.8~20 s,全方位探究零航速不同横摇周期时强迫横摇力矩以及力矩和运动之间相位的变化规律。试验发现,随横摇周期的增大,横摇力矩先减小,试验周期到达横摇固有周期附近时横摇力矩最小,之后横摇力矩逐渐增大,当横摇周期很长,船舶横摇缓慢,此时横摇力矩基本保持不变;同一横摇周期和不同横摇幅值下,横摇力矩与横摇幅值成倍数关系。随着横摇周期的减小,附加惯量成线性增加,横摇阻尼非线性明显,并随横摇幅值的增加而增大。

Forced Rolling Test and Analysis for Oil Tanker

The forced rolling model test has been studied for the oil tanker under three rolling amplitudes with rolling period from 0.8 s to 20s by using self-developed equipment and control system of the rolling test.The forced rolling moments and the phase shifts between the rolling moment and the rolling motion is comprehensively studied under the different rolling periods at zero sailing speed.The test results show that the rolling moment firstly decreases with the increase of the rolling period until it reaches to the minimum rolling moment when the test period approaches to the natural rolling period,and then increases gradually.Finally the rolling moment will remain constant when the rolling period becomes very long and the ship rolls slowly.The rolling moment is multiple relation with the rolling amplitude with the same rolling period and the different amplitudes.The added inertia increases linearly with the reduce of the rolling period,but the rolling damping increases nonlinearly with the increase of the rolling amplitude.