Cyclic mechanisms -- Dynamic models of cyclic mechanical systems -- Mathematical model -- Dynamic models with constant parameters -- Dynamic models with variable parameters -- Nonlinear dissipative forces -- Clearances -- Vibration analysis of cyclic machines using modified transition matrices -- Regular torsional cyclic systems  with  branched structure -- Regular cyclic systems with ring and branched-ring structure -- Regular cyclic systems with translational  motion of the  actuator -- Energy exchange in the regular cyclic oscillatory systems. Spatial localization of vibrations.