Nonlinear Vibration of Heated Co-rotating Disks

Nonlinear vibrations of co-rotating disks with thermal effects are investigated under non-uniform temperature distributions relative to airflow induced by disk rotation. For analytical investigation of thermal effects, the temperature distribution patterns are obtained through the heat transfer coefficients measurements. The natural frequencies for symmetric and asymmetric responses of an 86 mm diameter computer memory disk are computed. When the disk is heated, its stiffness becomes larger for the two lowest nodal diameter numbers and smaller for the other nodal diameter numbers. This implies that the vibration of heated, rotating disks for the higher nodal diameter numbers may be induced more easily than the cooled one.