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1·It is founded that the size of curvature difference envelop curve can detect that of pre-stress losses.

发现可以通过模态曲率差的包络图面积，较好的反映出预应力损失程度的大小。

2·HHT has not been put forward for long time, so it contains some theoretical problems, such as envelop and mean curve fit, boundary effect, modes mix and so on.

HHT刚提出不久，其理论本身还存在不少问题，如包络线和均值曲线的拟合、边界效应和模态混叠等问题。

3·This model contains a series of governing variables to envelop the complicated hysteretic curve of steel braces and the governing variables can be calibrated by available test results.

该模型通过一系列控制参数来包络钢支撑复杂的滞回曲线，并根据已有的同类型支撑试验结果标定控制参数。