假定桩为弹性杆，桩的轴向位移U是纵向坐标Y和时间T的两个变量的函数，用

假定桩为弹性杆，桩的轴向位移U是纵向坐标Y和时间T的两个变量的函数，用一个二阶偏微分方程来描述。

結果 (英文) 1:

Assuming that the pile is an elastic rod, pile axial displacement, u is the vertical coordinates y and time t is a function of two variables, using a second-order partial differential equation to description.

結果 (英文) 2:

Pile assumed elastic rod, axial displacement U piles longitudinal coordinates Y and function of two variables time T, with a second-order partial differential equations to describe.

結果 (英文) 3:

If the pile is an elastic rod, the axial displacement of the pile is a function of the two variables of T and the time Y, which is described by a two order partial differential equation.