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扩展散体单元法（ＥＤＥＭ）是结构倒塌模拟的一种方法。对于动力问题；ＥＤＥＭ的阻尼系数必须采用接近实际的取值。而 ＥＤＥＭ中常用粘滞阻尼的实质是Ｒａｙｌｅｉｇｈ阴尼，可通过已知的振型阻尼比确定阻尼系数。
Extended Discrete Element Method (EDEM) is a method of structural collapse simulation. For dynamic problems, the damping coefficient of EDEM must be close to the actual value. However, the essence of viscous damping commonly used in EDEM is Rayleigh damping nodules. The damping coefficient can be determined by the known damping ratio of mode shapes.