NONLINEAR OSCILLATIONS OF FLEXIBLE VERTICAL GYROSCOPIC ROTORS
Highspeed vertical rotors can have a rotating mass above or beneath the shaft support point [Kushul, 1968; Kushul, Zeitman, 1968; Zeitman, 1991]. Those of stipulate some constructional peculiarities: the highly flexible shaft and the massive rotor with the strong gyroscopic properties and vertical rotation axis at the availability resilient supports. It is proposed a new untraditional dynamic model which enables the adequate analytical description of the considered systems. Those of can be excited by the rotor unbalance and also by the support point vibrations. It is investigated the nonlinear oscillations for the system with rotor above the support point as well as a problem of the vertical rotation stability. It is also noted a variation of the vertical spinning stability threshold for the rotor system under investigation.