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The article is devoted to the investigation of the nonlinear effects in asystem of the coupled longitudinal-torsional parametric vibrations of arotating rod. Constructed and investigated mathematical model, based on whichwe calculated the resonance conditions of the nonlinear oscillations and foundthe ratio of the parameters that require changing of the sign of thecoefficient in front of the term defining the possible reverse of torsionalvibrations. The latter is a new phenomenon, a special mode, where theparametric action in the form of longitudinal vibrations at one end of the rod(for example periodic strikes in the rod's end with a certain frequency) canlead to torsional vibrations due to the nonlinear parametric interaction ofoscillations. In the context of this, the reverse leads to control not only therotation parameters, but also the direction of rotation, and there are possibletorsional oscillations, which can be used in precision mechanics devices.

Parametric Control of Nonlinear Longitudinal-Rotational Rod Oscillations and Phenomenon of Reverse Rotational Vibrations