为了提高旋翼动稳定性理论模型的分析精度，需要精确地确定旋翼系统的结构阻尼系数。
To analyze helicopter rotor dynamic stability with a high degree of accuracy, accurate and reliable damping coefficient determinations of rotor structure are needed.
为了解决这些问题，采用多重网格法建立结构的有限元计算网格，滑动面的边坡稳定性安全系数的计算网格，分别。
To solve these problems, multi-grid method is adopted to establish structural grid for finite element computation and slip surface grid for computing factor of safety of slope stability, respectively.
所研制的新型单体液压支柱具有结构工艺简单、工作行程大、使用范围大、稳定性安全系数大、重量轻、操作安全可靠等特点。
The new hydraulic support has some characteristics such as simple structure technique, big work-distance, large use-range, big stability safety factor, light-weight, safety-operation and so on.
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