在应用直接法和摄动法进行灵敏度分析时，使振动方程与灵敏度方程具有相同的固有特性而产生长期项。
The natural characteristics are the same for vibration and sensitivity equations when direct method and perturbation method are used for sensitivity analysis.
尽管粘弹性本构关系具有时间相依性，其随机摄动格式并不存在“长期项”的影响。
The relations of different random response variables are analyzed and Monte Carlo simulations for viscoelastic stochastic structures are investigated.
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