This paper describes nonlinear vibration and control of a vibratory machine which has a large work mass. Vibration of the vibratory machine and movement of the work are coupled through normal force and friction force. The coupled vibration is nonlinear, and a resonance curve in small excited voltage has a peak in low frequency region and a resonance curve in large excited voltage has a peak in high frequency region. Transportation velocity property shows the same tendency. Driving system of the vibratory machine using self-excited vibration follows the resonance frequency change automatically, and it improves machine efficiency. Amplitude constant control of self-excited vibration pulls up the upper limits of vibration amplitude and transportation velocity. Amplitude control using variable feedback gain starts up self-excited vibration quickly, and the vibration will not contain any higher-harmonic components, which make some noise.
