Dynamic Analysis And Amplitude Control Of Anti-Resonance Vibration Isolation Vibration Device

Dynamic absorber is a multiple-degree freedom vibration system which contained mass,stiffness coefficient,damping coefficient and other parameters.The number of natural frequency is the same as that of resonance points.When the amplitude of the system is the smallest,and the phenomenon of anti-resonance occurs.By using this phenomenon,this paper mainly revolves around the research of active anti-resonance vibration isolation device with lever and the main contents of this paper are as follows:Considering the anti-resonance vibrating conveyor as a subject investigated,based on the establishment of dynamic model of vibrating conveyor,along with the problem of unstable amplitude,amplitude-frequency response problems were analyzed.Dynamic parameters of the vibration system were also analyzed on the basis of amplitude expression with dimensionless.Performance of the anti-resonance vibration conveyor influenced by dynamic parameters was discussed and situation of amplitude response when the damping ratio was changing was analyzed and optimized.It improves the stability of amplitude of two plasmids in the anti-resonance vibrating conveyor effectively.Two-degree-of-freedom and three-degree-of-freedom dynamic anti-resonance vibration isolation devices with single lever are analyzed by using dynamic analysis theory,and transmission rate expressions of two devices are solved respectively.The relationship curve between frequency and transmission rate is used to discuss the effect of vibration isolation under the circumstance of alteration of damping,spring stiffness and the mass of the main vibration system respectively.Furthermore,the optimal design conditions are obtained by applying the extended fixed point theory and the optimal damping conditions and optimal coherent conditions are then deduced.Based on the MATLAB genetic algorithm toolbox,the spring stiffness and the damping are taken as the optimization parameters and the sum of the vertical coordinate values of resonance point and the anti-resonance point is regarded as fitness function.It makes the amplitude of shock absorber minimum In ensuring a wide frequency band.Moreover,parameters of two devices are optimized respectively and the optimal value and average value of each generation of fitness function generated by multiple iterations are obtained.Finally,the optimal values of spring stiffness and damping coefficient are obtained respectively,and the vibration isolation performances of the two devices are compared.Finally,a sliding mode controller is designed to control the input of exciting motor of a three-degree-of-freedom anti-resonant vibration isolation device with single lever.Low-pass filter is used in the process of sliding mode variable structure amplitude control.The corresponding control algorithm is designed,and its stability is analyzed,and the controller based on the controlled object is designed.The simulation result verify that the controller has played a role in controlling the amplitude and has reduced the chattering phenomenon in the process of control effectively.