Modernization of the Influence Coefficient Method for Determining the Dynamic Unbalance of a Rigid Two-support Rotor

The purpose of the work is to modernize the method of influence coefficients to increase the accuracy of determining the dynamic unbalance of a rigid two-support rotor. According to the modernized method, the rotor is installed on a balancing stand and the amplitudes and phases of the oscillations of the signals recorded from two single-axis vibration sensors during rotor rotation with a constant angular velocity are determined three times. The first time the rotor is rotated without adding test masses. The second time, a test mass is attached to the rotor in the first correction plane. The third time, a test mass is attached to the rotor in the second correction plane. After that, the relative values and relative positions of the unbalanced masses are calculated using complex coefficients in exponential form. The modulus of the complex number determines how many times the unbalanced mass in a certain correction plane is greater than the corresponding test mass. The angle sets the position of the unbalanced mass on the rotor and is counted from the test mass to the unbalanced mass in the direction of rotor rotation. Unbalanced masses are placed on the rotor at the same radius as the test masses. The modernized method uses in the calculations only the signals taken from two uniaxial vibration sensors and the phase sensor. The influence coefficients are not calculated explicitly. The values and locations of the test masses are not used in the calculations. This reduces the calculation errors, in particular, those caused by asynchronous data collection from the sensors.