The mathematic model was a nonlinear oscillator driven by wave exciting force while the restoring force was exponential.
系泊运动的数学模型是一个具有指数回复力特性的非线性强迫振子，以波浪作用力为外激励。
The effect of the nonlinearity on total wave exciting force and wave contour is discussed.
文中还就流动的非线性对物体的波浪扰动力和自由面波形的影响进行了讨论。
Then, a semi-analytical solution for the velocity response of the pile subjected to a semi-sine wave exciting force was derived by using invert Fourier transform.
利用付立叶逆变换，给出了半正弦脉冲激励下桩顶速度时域响应半解析解。分析了主要参数对响应的影响。
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