Abstract: In a bearing mounting for flexible rotors there are provided bearing heads for the journals of the flexible rotors and a foundation to support such bearing heads. For the purpose to influence the natural frequency of the combined system rotor - rotor support which is dependent also on the support stiffness it is desirable to change the support stiffness in the simplest possible manner in such a way that starting from the effects of the flexible rotor to be treated on the signal pick-ups, a control and/or closed loop control of counter-effects is possible to find the balancing quality of a flexible rotor independent of the present support stiffness.

Abstract: A procedure and a device are provided for determining the correlation between the unbalance of a rotor in at least one correction plane thereof and the measurement signal generated by such unbalance at one or more of the rotor supports. The vibration signals of the rotor are measured at different bearing support stiffness.

Abstract: A procedure for determining the magnitude and angular position of the unbalance of a rotor is described together with an apparatus for accomplishing same. A series of impulses are generated as the rotor rotates, and these impulses relate to the periphery of the rotor. When the unbalance is determined the particular impulse number at the time of that determination is noted, and such impulse is representative of a particular point on the periphery of the rotor.

Abstract: A balancing machine is used to measure the unbalance of a rotor by obtaining a first reading representative of the vector sum of the unbalance of the rotor and an amount comprising the product of the mass of the rotor and its eccentricity relative to the axis of the balancing machine. A second reading is obtained after shifting the rotor 180.degree. relative to the balancing machine while maintaining the same eccentricity, and the second reading is then subtracted from the first to obtain a final reading representative of the true unbalance of the rotor without influence of its eccentricity relative to the balancing machine. The final reading is used to effect a true balance of the rotor, and an arrangement is provided to accomplish such balance.

Abstract: The unbalance angle is transformed into units of length or into non-dimensional units which are correlated to the body to be balanced, either to a circumference thereof, or to a characteristic scale of the body to be balanced. The unbalance position may then be displayed in such units. The apparatus for performing the method includes a transformation computer which transforms the measured angular value through at least one operant. Preferably, the apparatus also includes an indicator device for units of length or for non-dimensional units or angle representing units.