Transverse vibration analysis and active disturbance rejection decoupling control of rain erosion blades considering mass distribution
In order to improve the stability and safety of the high-speed rain erosion resistance test device,the transverse vibration characteristics of rain erosion blades were analyzed with the rotor-rain erosion blade system as the research object.Firstly,a four-degree-of-freedom transverse vibration model of rotor-rain erosion blade system was established considering the effects of rain erosion blade vibration,mass eccentricity of rotary-blade connecting disc and unbalanced magnetic pull force of rotor.Then,the motion differential equation of rotor-rain erosion blade system was established based on Lagrange equation,and the Runge-Kutta algorithm was used to solve the equation numerically,in order to observe the distribution law of axis trajectory and vibration amplitude of rotor and rain erosion blade.Considering the nonlinear strong coupling relationship between rotor and rain erosion blade,an active disturbance rejection decoupling control method was adopted to suppress the transverse vibration of rain erosion blade,and the parameters of the extended state observer were adjusted by pole assignment and bandwidth.Finally,an experimental platform was set up to analyze the vibration characteristics of the rain erosion blade before and after adopting active disturbance rejection decoupling control,and the results were compared with the numerical analysis results.The results showed that the vibration of rotor-rain erosion blade system exceeded the standard before the active disturbance rejection decoupling control was adopted,but the transverse vibration of rain erosion blade could be effectively suppressed after the active disturbance rejection decoupling control was adopted,which verified the feasibility and effectiveness of the control method.The research results can provide theoretical reference for the structural optimization of high-speed rain erosion resistance test device.
rotor-rain erosion blade systemtransverse vibrationnumerical analysisactive disturbance rejectiondecoupling control
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