As an important component for transporting propellant,the turbopump has become the core of the rocket engine.Its axial force in high-speed operation has a significant effect on vibration.In order to improve the dynamic characteristics,a theoretical model of bearing stiffness was established.The evolution law of bearing stiffness with rotational speed and axial force was clarified.Besides,a rotor tester including auxiliary supports was designed,and the influence of axial force on the rotor dynamics was explored through tests.Furthermore,through the transfer matrix method and the unbalanced response,a stiffness identification model based on the measured data was established.It was found that the stiffness increased significantly by 30％,after the axial force was introduced.And the sudden increase of the vibration amplitude did not occur.This shows that the improvement of stiffness by axial force is an important mechanism of vibration reduction,thus providing a theoretical basis for dynamic design.
维普
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