我厂在方位控制器生产过程中，测试发现方位控制器的随动误差常处在临界状态。

In the manufacturing process of azimuth controller, we discover that the following error often lie in the critical state.

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采用摄动理论，本文导出了路面板临界铺设温差的渐近表达式并给出了误差分析。

By the perturbation method, the formula of the critical temperature difference may be found and the error of which may also be estimated.

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分析了振子的阻尼运动，得到了临界阻尼的附加条件，讨论了在一定的实验误差要求范围内，欠阻尼振子比临界阻尼振子更快地回到平衡位置的问题。

The paper also discusses the fact when that certain precision requirements are met, the underdamping vibrator returns more quickly to the balance position than the critical damping vibrator.

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