Fundamental Research on Damping Characteristics of Machine Structure Considering the Small Vibration Control

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This research aims at the small vibration control of the machine structure. The machine structure combines some components, so it is important for improving the damping characteristic of the structure to examine the contact mechanism between these materials. Then, the structural material is fixed between the holder blocks with the precise machine vise, and the damping behavior and the contact rigidity are examined when the impulse input is added. In the next place, the damping characteristic is examined experimentally when grains are inserted into the hollow part of the structure. First of all, the hollow structure or the grain-inserted structure is excited with the impact hammer, and the damping behavior is estimated from the response wave form. Furthermore, the vibration characteristic is examined by the sine wave-excitation method.As a result, the contact rigidity and the damping characteristic of the grain-inserted structure are obtained from these experiments. First of all, the damping characteristic in the contact part changes by the input and the clamping load, and it has been understood that the optimum clamping condition is existed judging from the damping characteristic. Moreover, the damping characteristics of the grain-inserted structure are influenced by the kind of the grain material, the grain size, and the packing density of the grains. Especially, when the ceramics grains are inserted, the damping characteristic has been greatly improved. In addition, it has been understood that the vibration characteristic is greatly improved by the inserted material, the grain size, and the packing density of the grains.This research is scheduled to examine the more detailed examination based on these results for the future.