PD Control And Simulation On A Rotor Bearing System With Three Flexible Sleeves

Active control technology of rotor vibration is a hot topic in the field of rotor dynamics. With the development of modern control theory, computer and measuring technique, vibration control technology of rotor is trans from passive control to active control. To achieve active control of rotor system, the kinds and structures of bearing is accordingly developed, various forms of unconventional flexible bearings are used successfully or under development, an active oil bearing with three flexible sleeves is one of them.Computer simulation is to use computer to simulate the objective world of natural phenomenon, system engineering, motion regularity, artificial intelligence, etc. to establish the mathematics model of the physical system and to solved it on computer. With the popularity and progress of computer, numerical simulation combined with computer graphics, visualization technology, computer simulation has found an increasingly wide utilization in engineering design, production management, experimental study, system analysis, etc.This paper based on the model of the rotor bearing system with three flexible sleeves, applied PD control strategy to simulate the active control of vibration, in the environment of VC++6.0, based on MFC developed a system simulation platform, and do simulation research on the active control of the system. The main research work includes the following:(1) Firstly introduces the Physical model and working principle of all parts of the rotor bearing system, corresponding to the Physical model, detailedly described the mathematical methods used in mathematical modeling, analyzed the principle and characteristic of the mathimatical methods.(2) Analyzed the advantages and applications of PD control strategy, using the Model of the rotor's whirl displacement and velocity construct the goal function, apply PD control strategy to the mathematical model of the rotor system, exert PD control strategy to the active control of the rotor bearing system.(3) In the environment of VC++ 6.0, based on MFC developed a system simulation platform, design simulation interface and programming algorithm, convert the mathematical model to computer program. The platform can realize real-time simulation in many situations, promote efficiency and flexibility of system simulation.(4) Use the system simulation platform, engaged in a great deal of real-time simulation study on the system in free vibration and forced vibration respectively. studied the rotor and sleeves oscillating curve, Rotor center trajectory, Active control pressure curve, etc. compared, analyze and conclude the simulation results before and after active control.The simulation result shows that PD control strategy could control system vibration efficiently, vibration reduction is obvious, greatly improved the stability of the system. this kind of active bearing can achieve obvious control effect, the study give more impetus to the application in the field of high speed and heavily loaded rotary machinery.