Research On The Key Technology Of Vibration Synchronization And Controlled Synchronization Under Nonlinear Vibrating System Sharp Resonance Conditions

In order to guanrantee the stable synchronization motion and amplitude stability, classical vibrating machine mostly work under the far ultra resonating (z≈3～6) or near resonating (z≈0.8～0.9) conditions. But accompany with the development of computer control technology, the problem of amplitude stabilty can be solved by computer control technology well. So based on the resonance principle that vibrating machine arrived at required amplitude, but the exciting force is the least, the dual-exciting motors synchronization drive sharp resonance vibration machine which work at the frequency radio z≈0.95～1.05has been put out. Because the energy-saving, economical and efficient characteristics of this type vibrating machine, it represents one of the most important development direction of vibrating machine. But at present the related vibration synchronization theory research mostly have been carried out at the far ultra resonating or low critical near resonating conditions for the vibration machine. To the sharp resonance vibrating machine, the dual-exciting sources, multiple-degree-of-freedom and the gap between every components assembly, friction and so on make the nonlinear factors abnormal outstanding, so the nonlinear vibrating system cannot be simply neglected or linearization processed. Which make us comprehensive considerate the nonlinear dynamic behaviors of the vibrating system. And use them to research and settle the synchronization and synchronization motion stability of the dual-exciting motors which used to drive the nonlinear vibrating system under the systemic sharp resonance conditions. The research results have important theoretical significance and practical engineering application value.In order to disclosure the sharp resonance vibration synchronization motive mechanics of the nonlinear vibrating system from the theoretical perspectives, in the second chapter of this paper, the dynamic model of nonlinear vibrating system had been established based on the machinery dynamics and nonlinear vibration theory. The equivalent numerical simulation model of exciting motor and nonlinear electric characteristics model have been established based on the electric machinery drive theory. Now lead the machine dynamics model and motor model into a uniform research object, which can be used to compose the coupled electromechanical dynamic model for nonlinear vibrating system.Different the previous research which mostly carry out carry out the dual-exciting motors vibration synchronization theory under far more than resonance or low critical near resonance conditions from the view of linear or quasi-linear, in this paper make the single-mass multiple-degree of freedom weakly nonlinear system and single-mass single-degree of freedom strongly nonlinear system as the research object to carry out the vibration synchronization theory research. In the third chapter of this paper, use the nonlinear system average method, energy method and so on to carry out the theoretical analysis. And to analysis the harmonic sharp resonance harmonic vibration synchronization phenomena of the dual exciting motors during the course of the vibrating system motion, because of the systemic nonlinear factors. The relationship between the vibration synchronization of dual-exciting motors and the sharp resonance working frequency of nonlinear system had been discussed in the paper. The influence of the vibrating systemic elastic force, damping force, inertial force and the rotary inertia of eccentric runner, mechanical electric external characteristics of exciting motor and so on to the vibration synchronization of dual-exciting motors have been analyzed also.When the nonlinear vibrating system works under sharp resonance conditions, the phase difference and rotational speed difference may change because the initial condition difference, technical parameter difference of dual-exciting motors and the synchronization motion is so fragile that can be influenced by outer environment condition. All make from the nonlinear vibrating system dynamics view to research the vibration synchronization for dual-exciting motors, at same time must to research the controlled synchronization problem of dual-exciting motors. In the forth chapter of this paper, the transfer function of equivalent model have been deduced, and the deviation compensation tracking control synchronization strategy have been established in the paper. In the section of4.3, the fuzzy self-adaptive estimator for rotational speed and rotor flux of asynchronous motor have been designed based on the nonlinear electronic characteristic model of ac asynchronous motor, and the vector control system for motor have been established based on the estimator which refer ahead. Based on the front analysis the cross coupling coordination synchronization control scheme for dual exciting motors has been established. From the test discussion and simulation analysis, the conclusion that the controlled synchronization strategy which designed in the paper can make the dual exciting motors realize the controlled synchronization under the nonlinear vibrating system sharp resonance conditions. The controlled synchronization can effective avoid the deficiency of traditional literature only realize the controlled synchronization motion at far more than resonance or low critical near resonance conditions.In order to discovery the synchronization motion mechanism of dual exciting motors when the nonlinear vibrating system works under sharp resonance conditions. In the fifth chapter, the frequency capture sharp resonance phenomena of nonlinear vibrating system have been quantify simulation analysis, based on the electromechanical coupling dynamics model for nonlinear vibrating system which driven by dual exciting motors. The interrelationship between the non-ideal driving source and body’s motion of nonlinear vibrating system had been discussed. And the vibration synchronization transient change law of dual exciting motors had been researched when the nonlinear vibrating system moved to the sharp resonance point. The relationship between the frequency capture sharp resonance synchronization phenomena of nonlinear vibrating system which driven by dual exciting motors and the stiffness, damping of vibrating system, driving torque of dual exciting motors, friction resistance torque, centric torque of eccentric rotor and so on. And the various possible motion forms of vibration response and synchronization rotate for dual exciting motors have been discussed, when the spring stiffness and damping of nonlinear vibrating system changed.In the sixth chapter, the phenomena of sharp resonance vibration synchronization and amplitude stability controlled have been discussed, based on the practical experiment on sharp resonance experimental table which driven by dual exciting motors. And the correctness of the theoretical study results and controlled strategies which researched in this paper had been proved.