Vibration Isolation Research Of Grating Ruling Machine Based On Vibration Isolation Theory Of The Quasi-zero Stiffness And Neural Network PID Sliding Mode Control

Currently,linear vibration and linear vibration isolation theory have been studied more thoroughly,and used in the engineering practical problems to solve a lot of practical engineering problems.However,most of the vibration caused by practical problems has nonlinear factors.But,the theory and application of nonlinear vibration isolation is still in the stage of continuous exploration and research,and low frequency vibration isolation still faces challenges in the field of engineering.From the vibration transmissibility curve,if the excitation frequency is not less than 2^1/2 times the natural frequency of the isolation system,then the system will achieve the vibration isolation effect.Therefore,in order to overcome the adverse effects,the researchers use different quasi zero stiffness vibration isolation system to achieve the purpose.In this thesis,a quasi-zero stiffness vibration isolation system is designed and analyzed by drawing on and absorbing the previous research results.The system is composed of a linear elastic element with positive stiffness and four magnetic spring rods with negative stiffness,having good vibration isolation effect.The main contents of this thesis are as follows:?1?Firstly,a quasi-zero stiffness vibration isolation system model is designed,and the model is analyzed on the basis of the analysis,including the static analysis of the vibration system without vertical elastic element and vertical elastic element.?2?Secondly,dynamic model of the quasi-zero stiffness vibration isolation system is analyzed,and the solution of the response of the vibration isolation system under harmonic excitation,the amplitude frequency characteristic equation of the system and the influence of system parameters on the amplitude frequency characteristics of the discussion.?3?Finally,based on the quasi-zero stiffness vibration isolation system,the stiffness active vibration isolation system's the mathematical model is established.And based on the sliding mode variable structure control theory,the sliding mode control will inevitably appear chattering,so using RBF neural network to reduce the chattering,and the design of a RBF neural network controller.