耦合摆运动中的位相与机械能流的方向

Relation between the phase and the direction of the mechanical energy flow in a coupled pendulum movement

用张紧的弦绳和2个相同的单摆构成的耦合摆振动系统,能直观地将物体间的机械能传递现象突出地显示出来;实验中获取的运动曲线,显示了拍的节点处,两摆的位相是交替变化的,两摆的振幅也跟随着位相而增减,即可得出结论,位相在前的摆,向位相在后的摆输出能量,位相决定了机械能流的方向。

The oscillation system, which is constituted by stressed strings and two identical simple pendulums, can display mechanical energy transfer between two objects. A phase diagram obtained from the experimentation shows that phases of two pendulums transform in turn in beat oscillation and the amplitude of the two pendulums increases or decreases with the changing of the phases. The pendulum with the lead phase always transfers energy to the pendulum with the lag phase. In conclusion, the phase determines the direction of the mechanical energy flow in a coupled pendulum movement.