21. Exploring Vibration Characteristics in Dual-Turbine Generator Sets for Ocean Thermal Energy Conversion

In order to study the problems related to the vibration characteristics of an ocean thermal energy dual-turbine generator set, we established a three-dimensional model of the unit's rotor system and used harmonic response analysis based on ANSYS software to investigate the effect of gas bearing air film pressure on the dynamic characteristics of the rotor system. At the same time, we also conducted an experimental study to understand the vibration characteristics of the unit during transient speed increase and decrease. Through harmonic response analysis, we obtained the amplitude-frequency characteristic curves of the impeller and rotor system, and determined the variation relationship between the frequency of the external excitation force and the radial and axial amplitudes. The analysis results show that the generator set can maintain stable operation when the excitation force fluctuates. In addition, through the experimental study, we found that the vibration amplitude of the unit during transient speed increase and decrease is small, showing good stability. These research methods provide certain theoretical and experimental bases for further in-depth study of the air-floating dual-turbine unit.