Experimental investigation of unbalance response of geared shaft rotor system

Gear systems can be viewed as a rotor system composed of two or more rotors interacting with each other. Vibration of gear system has been studied as an important subject because it causes unwanted noise and vibration behavior such as gear whining. In most reported gear analysis, deformation of the engaged teeth and gears and sometimes elasticity of the shaft are considered, however not the rotor effect of the overall gear system. Obviously such practices assume the effect of rotor motion is insignificant relative to other effects, which may not be true for some highspeed rotating gear pair with overhang supports. In such systems the rotor deformation observed in the whirling motion is expected to be comparable or even larger than the effect of the tooth or gear deformation.