It is calculated through the translation of casualty and direct loss into a normal index, which is a method of simplicity and applicability.

灾级大小是将一次灾害中死亡、伤害和直接经济损失数折算成规范化指数后计算出来的。其方法简单易行，且适用性强。

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The damage diagnosis method based on vibration testing can be further classified as a direct system identification method, a damage index method and a finite element model modification method.

其中基于振动测试的损伤诊断法可进一步分为直接的系统识别方法、损伤指标法和有限元模型修正法。

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