现摘录一段话(引自chopra的结构动力学):
Experiments on structural metals indicate that the energy dissipated internally in cyclic straining of material is essentially independent of the cyclic frequency,Similarly,forced vibration tests on structures indicate that the equivalent viscous damping ratio is roughly the same for all natural modes and frequencies.Thus we refer to this type of damping as rate-independent linear damping.Other terms used for this mechanism of internal damping are structural damping,solid damping,and hysteretic damping.We prefer not to use these terms because the first two are not especially meaningful and the third is ambiguous because hysteresis is a characteristic of all materials or structural systems that dissipate energy