Dynamic Vibration Suppression Of Piezoelectric Intelligent Using Active Bearing Rotor System

Large-scale rotating machinery is a sign of the degree of development of the national equipment manufacturing industry.However,domestic large-scale units still have problems such as poor stability and frequent failures.As the core component of rotating machinery,the stable operation of the rotor system is one of the key factors to ensure the stability of large-scale units.The rotor system will inevitably have vibration problems under high-speed operation,which can cause the unit to shut down or even cause major accidents such as machine destruction.Therefore,in order to ensure the stable operation of the unit,the vibration of the rotor system must be effectively controlled.In this paper,the active vibration suppression method is adopted,and the piezoelectric stack is used as the actuator to design the active bearing,and it is applied to the rotor system for vibration suppression research.Combine PID control algorithm and LQR control algorithm to analyze the feasibility and effectiveness of the active bearing vibration suppression,and provide corresponding test verification.The specific research content is as follows:(1)The mathematical model of the piezoelectric stack actuator is established according to the piezoelectric equation of the piezoelectric material;the structure of the active bearing of this subject is designed and its working principle is explained;the dynamic model of the active bearing-rotor system is established and simulated This improves the effectiveness of the active bearing support.(2)The PID control algorithm is applied to the active bearing to study the active suppression of the rotor system vibration,and the transfer function of the active bearing-rotor system is derived;combined with the designed PID controller,it is analyzed that the active bearing is subjected to transient excitation and the rotor system The vibration suppression effect during steady state excitation verifies the feasibility and effectiveness of active bearing vibration suppression from the theoretical simulation level.(3)The LQR control algorithm is introduced into the active bearing-rotor system,and the state space model of the active bearing-rotor system is established;based on the solution of the linear quadratic optimal regulation problem,the LQR controller is designed;and then the LQR control algorithm is used,The vibration suppression effect of the active bearing on the rotor system under transient excitation conditions and steady-state excitation conditions is studied,and the best control effect of active bearing vibration suppression under two excitations is given.(4)The piezoelectric stack actuator of the active bearing was tested and tested;the active bearing-rotor system test bench was built;the corresponding PID algorithm and LQR algorithm control program were written using Labview software;the active bearing to the rotor was completed The effectiveness of the system’s transient vibration and steady-state vibration suppression is verified,and corresponding conclusions are given.The research work in this paper provides theoretical and experimental references for the research of active vibration control algorithm and active vibration suppression of rotor system.