Experimental Study on Vibration Behaviors of Flexible Support Rotor System Under Base Excitation
Due to the complex working environment,the rotor system is subjected to external excitation from the base randomly during the actual operation which will lead to abnormal vibration of the rotor system in a certain probability,and even affect the normal operation of the rotor system in serious cases.In this paper,a rotor test platform with a squirrel-cage rotor is designed and built to simulate the base excitation of different modes by loading the exciter.The rule of effect of different base excitations on the vibration behavior of the elastomeric rotor system was studied experimentally.Based on the test results,it appears that the base excitation is transmissible and can be conveyed to both the support and rotor through the base.As the excitation frequency increases at a consistent speed,there is also an increase in the vibration response amplitude of the rotary disc and rotating shaft.Additionally,the amplitude of the spring-cage strain exhibits sporadic fluctuations.The behavior of the flexible support-rotor system's vibrations is heavily influenced by the direction of the base excitation.The spectrum comprises frequency doubling components and excitation frequency,with the vibration amplitude increasing as the excitation frequency rises(between 40～80Hz).With transient excitation,the power frequency vibration amplitude of the rotary plate and rotating shaft,as well as the power frequency strain amplitude of the squirrel cage,both increase as the excitation frequency rises(between 0～2Hz).Conversely,the power frequency vibration amplitude of the rotary plate and the rotating shaft,as well as the double power frequency strain amplitude of the squirrel cage,both decrease as the excitation frequency increases.
Elastic SupportElastomeric Rotor SystemBase ExcitationVibration CharacteristicsExperimental Research
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