Multiple-objective design optimization of squirrel cage for squeeze film damper by using cell mapping method and experimental validation

摘要

Squirrel cage is commonly used in aero-engine compressors serving as a centering spring. The cage is supposed to be optimally designed in order to provide reliable service under harsh working conditions. In this paper, a flexible rotor system supported on squeeze film dampers (SFDs) is considered, and a novel multi-objective optimal design method for the squirrel cage is proposed, considering the reliability of squirrel cage, stability of rotor system, dynamical response of rotor and damping effect of SFDs. Theoretically, the optimal values of design parameters, known as the Pareto set, are obtained using the cell mapping method for different rotor imbalances. Experiments are carried out to validate the proposed method, and the results show that the optimally designed squirrel cage achieves satisfactory performance under different machine operating conditions. The proposed multi-objective optimization method offers a novel and promising tool for squirrel cage design in real industries. (C) 2018 Elsevier Ltd. All rights reserved.