In the paper, the calculation formulas for equivalent structural damping ratio of control effect of passive absorbers for fluctuating wind vibration responses of tall buildings are derived.

Recently developed composite damping structures indicate that various damping requirements can be met through simple composition of several damping materials.

And several composite damping structures w ere introduced, and some analysis about their working mechanism were given.

Study on equivalent damping calculation for hydraulic damper of helicopter rotor;

Based on the classic composites laminates theory,the stiffness matrix and the equivalent damping matrix of the laminates which can be described by elastic constants and damping constants were determined.

And the equivalent damp of super-elastic effect o f TiNi Shape Memory Alloy is calculated by simulating its cycle curve using experimen t data.

And we calculate equivalent damp of super-elastic effect of TiNi Shape Memory Alloy through simulating its cycle curve.

According to the characteristics of the series-base-isolation structure,the calculation formulas for the equivalent damp and equivalent stiffness of the structure were given,and the desirable equivalent damp could be obtained.