Structural Principle And Vibration Isolation Control System Experiment Of An Inner Bypass Magnetorheological Fluid Mount

In view of the low controllable range of dynamic stiffness of the existing magnetorheological fluid(MRF)mount,the large zero field dynamic stiffness and the limited working stroke,an inner bypass MRF mount,which has a large dynamic stiffness range in the full working frequency range,small zero field dynamic stiffness and the maximizing working stroke,is proposed and realized in this paper.And using theoretical analysis,numerical simulation and experimental verification methods to study the dynamic characteristics of the engine isolation system,the test and modeling of the inner bypass MRF mount,the vibration isolation control method,the simulation and experiments of the engine vibration isolation control system.Based on the analysis of some existing problems in this field,the main research work is proposed.The details are as follows:(1)The electromagnetic field simulation of the proposed inner bypass MRF mount is carried out by using the finite element simulation software.The mathematical model of the controllable damping force of the mount is established and verified by experiments.The static and dynamic mechanical properties of the mount are tested on the servohydraulic actuation system.The damping and stiffness of the tested model are identified by BP neural network which is prepared for the subsequent research of the control method.(2)Based on the in-depth analysis of the engine excitation source,the dynamic model and kinematics equation of the vibration isolation system which can reflect the main vertical vibration of the single cylinder engine are established.A sub-band control strategy based on the vibration frequency is proposed.A simulation research platform for the MRF mount vibration isolation based on MATLAB/Simulink is built.The vibration frequency based controller and fuzzy controller are compared on the vibration isolation effect of the whole machine.(3)In order to verify the high efficiency on the control of the powertrain vibration using the control algorithm proposed by the paper,a set of MR controllers was proposed and designed,and the vibration control experiment bench of the engine powertrain mount system was built and the experimental on related vibration isolation control is carried out.