接触回転系におけるパターン形成現象

（近似特性根を用いた安定判別法）

抄録

The dominant mechanism involved in pattern formation phenomena in contact rotating systems is considered to be unstable vibrations generated in linear time-delay systems due to processes such as viscoelastic deformation, wear, cutting and grinding. A number of countermeasures have been proposed to prevent the occurrence of these formation phenomena. In this report, using a new type of complex modal analysis method for two degree of freedom system, the author seeks the approximately characteristic solution. The result shows the validly of the approximately characteristic solution by comparing to the exact characteristic solution. In addition, an optimization procedure for the dynamic absorber is considered, using this method.