Analysis on dynamic characteristics of elastic beam in large-scale rotation with eccentricity effect
In this article,with the rotor eccentricity effect taken into account,efforts are made to applied the rotor dynamics theory,the Galerkin method and the Hamilton principle to set up the dynamic model of the motor-elastic beam system.The Runge-Kutta method is used to realize dynamic decoupling,explore the dynamic characteristics of the elastic beam in large-scale rotation at different speeds,as well as compare and analyze the coupling relationship between the motor rotor's dynamic eccentric-ity and static eccentricity on one hand and the rotating beam's vibration characteristics on the other hand.The results show that the rotor's dynamic eccentricity and the system's dynamic response are strongly coupled.When the dynamic eccentricity reaches 0.5 mm,the rotating beam's amplitude is as high as 2 mm.When the static eccentricity increases from 0mm to 0.5 mm,the amplitude remains at 0.178 mm,and the static eccentricity factor can be ignored in the subsequent studies.When the rotating speed increases to 150 rad/s,the vibration of the elastic beam changes from periodic vibration to non-periodic vibration,under the influence of the rotor's dynamic eccentricity.It is also one of the main reasons why such mechanisms exhibit varying degrees of sudden or intermittent vibration at high speeds.
large-scale rotationelastic beamdynamic eccentricitystatic eccentricitydynamic and static eccentricity
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