叶片缘板阻尼特性的自由振动测试

An experimental system based on damped free vibrations was developed. By applying loads to the blade model to induce a first-order bending mode，followed by releasing the load to create first-order bending vibrations，a comprehensive damping ratio characteristic curve could be acquired from a single test. This was achieved by monitoring and analyzing the time-domain signals of strains and accelerations at crucial positions. Experimental findings showed that the damping ratio curves obtained through experiments aligned closely with those generated through numerical simulations. Furthermore，the maximum damping ratio was kept constant despite of variations in the damper’s inertial load. Additionally，dampers with different contact areas had similar critical damping ratios. However，the damping effect was found to be positively correlated with the length of the shank.