By using the unified colored noise approximation method, the master equation for probability density, the steady state probability distribution function and its extrema equation are derived.

讨讼色泊松噪声驱动系统，利用统一色噪声近似方法，得到系统几率密度主方程，定态几率分布函数及其极值方程。

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The probability density evolution equation (PDEE) of the stochastic structural response is then established by introducing augmented state vector.

密度演化方法是一类直接获取随机结构动力反应概率密度函数及其演化过程的有效方法。

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