考虑多种载荷情况，并假设每个原有节点的质量不变。
We take into consideration multiple loading conditions and assume the mass of each existing node to be constant.
最后对自由振动，脉冲激励和运动载荷情况分别进行了讨论。
Finally, the cases of free vibration, impulsive response and moving load are also discussed.
大型水平轴风力机运行在复杂的自然环境中，所受载荷情况非常复杂。
Large Horizontal Axis Wind Turbine runs in complicated environment, the loads it endured are also very complicated.
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