still water rolling

In water, paddles and OARS have given way to screw propellers and turbines, but stability in response to the rolling motion of water is still a problem.

在水里，桨橹已经由螺旋桨和涡轮机替代，但是在涌动的水里使船只保持平稳仍然是一个问题。

In comparison with linear rolling in still water, the effects of nonlinear damping and righting moment on ship's rolling motions were analyzed.

通过与静水中线性横摇运动的比较，分析非线性阻尼力矩和非线性复原力矩对船舶横摇运动的影响。

Firstly, mathematical expressions of nonlinear damping and nonlinear righting moment were discussed, and the equations for nonlinear rolling motions in still water and in waves were established.

首先，本文讨论船舶非线性横摇运动中非线性阻尼力矩和非线性复原力矩的数学表达形式，并建立船舶在静水中和波浪中的非线性横摇运动方程。