基础模板支设不牢固，浇筑混凝土下料过高、混凝土振捣撞击，使模板位移，造成基准线产生偏差。
The foundation template support is not strong, the pouring concrete is too high, the concrete vibration impact, so that the template displacement, resulting in the deviation of the baseline.
其次，分析了弹簧吊装系统的跌落冲击响应特性，得到产品的最大位移、最大加速度、冲击持续时间分别与基准系统相应值的比值；
Secondly, shock response property is analyzed, the ratios of item' s most displacement, most acceleration and shock duration to benchmark system are obtained.
对没有固定基准的自由网，位移矢量是真实位移的有偏估值，有时精度最高的地方发现变形能力并非最强。
The displacement vector is biased estimated values, and sometimes, the area where the measuring accuracy is the highest could not have the best ability to detect the deformation.
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