The modal characteristics of the multi-rotor coupling system in an integrally geared compressor (IGC) for Compressed Air Energy Storage (CAES) have a critical influence on system dynamics and reliability under variable operating conditions. Taking into account the coupling effects of multi-gear meshing, a mathematical model of the IGC rotor system was established. Firstly, the modal characteristics of each independent shaft train were calculated before and after the gear meshing. Analysis revealed that gear engagement alters the natural frequencies and mode shapes of individual shaft trains and introduces new gear-related frequency components. Subsequently, an orthogonal experiment was designed for the control parameters (power, rotational speed, inlet oil temperature), followed by range analysis and analysis of variance (ANOVA). This process revealed the effects of each control parameter on the various modal characteristics and the derived natural frequencies of the rotor system. Rotational speed exhibited the highest sensitivity, followed by power and then inlet oil temperature. Multivariate linear regression prediction models were then established for each dependent variable, yielding the regression coefficient values for each control parameter. Finally, validation using field vibration data confirmed the accuracy of the method and models, providing a theoretical basis for optimizing CAES control strategies.
Mao et al. (Wed,) studied this question.