1. imbalances The magnitude of an unbalanced amount on a plane of the rotor does not involve an unbalanced angular position. This is equal to the product of the unbalanced mass and its centroid to the rotor axis, and the unit of unbalanced quantity is gmm or gcm, commonly known as "mass product ". 2. unbalanced phase the angle value of the unbalanced mass on a plane of the rotor relative to a given polar coordinate. 3. imbalances An uneven measure of unit mass of a rotor in gmm/kg.. Equivalent to mass eccentricity of rotor in μm. at static imbalance 4. initial unbalanced quantities. uneven measurement of presence on the balance front rotor. 5. allowance for imbalance the remaining unbalance amount of the rotor allowed to ensure the normal operation of the rotating machinery. When the indicator is expressed as an imbalance, it is called an allowable imbalance (also called an imbalance rate). 6. residual imbalances the remaining unbalanced amount on the rotor after balance correction. 7. corrected radius distance from the centroid of the corrected mass to the rotor axis on the correction plane, generally expressed in mm. Disturbance of 8. correction plane (interaction) A change in the amount of imbalance on a given front of a rotor causes a change in the indicator value of the balancer on another correction plane (sometimes called the effect of plane separation). 9. rotor balance quality an index to measure the rotor balance. G=eperω/1000 Medium G- rotor balance quality, unit mm/s. From G0.4-G4000 to level 11. eper- rotor allowable imbalance gmm/kg or rotor mass eccentricity μm. ω- angular velocity corresponding to the maximum operating speed of the rotor =2πn/60≈n/10,n is the working speed r/min of the rotor 10. Allowable imbalances per unit mass of the rotor (rate) Unit eper=G×1000/ n/10: gmm/kg or μm 11. Minimum remaining imbalances (Umar) a minimum achievable residual imbalance (Umar). gmm. unit Its meaning refers to the minimum value of the remaining unbalanced amount that the balance function makes the rotor reach. is the performance index to measure the highest balance ability of the balancer. When the index is expressed by the imbalance degree, it is called the minimum achievable residual imbalance degree. (Unit gmm/kg) 12. Reduction in imbalances (URR) the ratio of the reduced unevenness measure to the initial unbalanced amount after a single balance correction. This is a performance measure of balancer efficiency expressed as a percentage: URR(%)=(U1-U2)/U1(1- U2/U1)×100 U1- initial imbalance U2- of remaining imbalances after one balance correction 13. Unbalanced couple interference ratio Performance index of single-sided balancing machine to restrain the influence of unbalanced couple. An uneven measure of unit mass of a rotor in gmm/kg.. Equivalent to mass eccentricity of rotor in μm. at static imbalance 14. Check rotor rigid rotor designed to check the performance of the balancer. Its quality, size, size are specified, discrete and horizontal two. Vertical rotor mass 1.1,3.5,11,35,110 kg.. Horizontal rotor mass 0.5,1.6,5,16,50,160,500 kg.