讨论了弹性波多普勒效应的叠加性质，并指出相对论的时间膨胀和长度收缩对弹性波多普勒效应的影响。

The superposition property of elastic wave's Doppler effect and the influence of relativistic time dilation and length contraction on elastic wave's Doppler effect are also discussed.

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该法把时间分割为若干时间段，求解各段因收缩、徐变和松弛引起的预应力损失，并叠加求总损失。

With the time being separated into some periods, the prestressing loss in each period due to shrink, creep and relaxation is calculated, and then the total loss obtained.

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