Now let us consider the cable motio

Now let us consider the cable motions due to vibration of the cable with fixed ends. Since the
cable considered here has very small sag and high initial axial stress, the axial motion um(x, t) can be neglected. Considering the fact that the sag of the cable is very small, the modal superposition method is employed for transverse modal motions

結果 (中文) 1:

现在让我们考虑振动的电缆两端固支的电缆运动。因为这里考虑的电缆具有很小的凹陷和高初始轴向应力、 um (x，t） 的轴向运动可以忽略不计。考虑到电缆的凹陷是很小的事实，模态叠加法被用于横向模态运动

結果 (中文) 3:

现在让我们考虑运动由于电缆两端固定电缆的振动。由于
电缆认为这里有很小的凹陷和高初始轴向应力，轴向运动的μ（x，t）可以忽略。考虑到电缆的凹陷是非常小的，模态叠加法进行横向模态运动