...扰动方法（如矩方程法，格林函数法，混合格林函数法）及基于Taylor展开 的所谓一次二阶矩法（first-order second-moment method）。所有这些方法在用于实际现场尺寸的流动 和（或）输运问题时，所需计算量很大。
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用一次二阶矩法分析结构可靠度需要反复迭代求解。
For structural reliability analysis calculation. Rackwitz and Fiessler Method has to employ iteration.
采用改进一次二阶矩法分析单个夹杂裂纹扩展的可靠性。
The reliability of the fatigue crack growth life of single inclusion is analyzed by the advanced first order and second moment method.
采用改进的一次二阶矩法对腐蚀管道的可靠性指标和失效概率进行了分析和计算。
The advanced first order and second moment iterative method are employed for calculation on reliability index and failure probability.
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