TY - JOUR N2 - To achieve acceptable dynamical behavior for large rotating machines operating at subcritical speeds, the balancing quality check at the planned service speed in the installation location is often demanded for machines such as turbo-generators or high-speed machines. While most studies investigate the balancing quality at critical speeds, only a few studies have investigated this aspect using numerical methods at operational speed. This study proposes a novel, model-based method for inversely estimating initial residual unbalance in one and two planes after initial grade balancing for large flexible rotors operating at the service speeds. The method utilizes vibration measurements from two planes in any single direction, combined with a finite element model of the rotor to inversely determine the residual unbalance in one and two planes. This method can be practically used to determine the initial and residual unbalance after the balancing process, and further it can be used for condition-based monitoring of the unbalance state of the rotor. L1 - http://www.czasopisma.pan.pl/Content/121679/PDF-MASTER/SS6_10_02238_Bpast.No.69(6)_OK.pdf L2 - http://www.czasopisma.pan.pl/Content/121679 PY - 2021 IS - 6 EP - e139790 DO - 10.24425/bpasts.2021.139790 KW - flexible rotor KW - inverse approach KW - onsite-balancing KW - residual unbalance KW - single and double plane A1 - Bastakoti, Satish A1 - Choudhury, Tuhin A1 - Viitala, Risto A1 - Kurvinen, Emil A1 - Sopanen, Jussi VL - 69 DA - 08.12.2021 T1 - Model-based initial residual unbalance identification for rotating machines in one and two planes using an iterative inverse approach SP - e139790 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/121679 T2 - Bulletin of the Polish Academy of Sciences Technical Sciences ER -