On increasing of internal friction with elastic hysteresis in the compression member bars of vibration protection system

The authors present the results of theoretical research, which explain the experimentally observed increase of internal friction in the framework of classical theory of elastic hysteresis inn the vibration protection systems, which use quasi-zero stiffness effect. Here elastic element was done as a bar, stiffness of which is decreasing by compressive force. The phenomenon is more marked when minimum stiffness bars takes place. It corresponds to the infra-low oscillation frequency in the system "bar-vibration protection object" (0.1-0.5 hertz).