Phase-free static balancing for high-speed overhanging rotors

Abstract

In this paper static balancing procedures for a machine with an eccentrically arranged overhanging rotor are discussed. The aim is a heuristic method for static balancing of such an overhanging rotor based on conventional acceleration measurements without any reference phase information. In conventional balancing processes, measured vibration signals proportional to the unbalance are evaluated with the aid of a stationary reference signal. Furthermore, limitations concerning balance weights and positions have to be considered. In our case, we have six available holes in the rotor at a specified radius to add a combination of metal studs with predefined weights. The speed of the rotor ranges up to 10.000 rpm. The experimental results of the proposed method are compared to a well-recognized graphical balancing method for rigid rotors. Special effort was made to use the already installed vibration monitoring accelerometer for the balancing process.