Research On Characteristics Of Vibration Isolation System Based On Finite Element Power Flow

The vibration isolation and noise reduction of mechanical structures have 66 always played a pivotal role in theoretical research and industrial practice.The mechanical vibration caused by dynamic machinery has always been a hot topic in engineering research.In recent years,with the continuous development of technology,the engine speed and power of the vehicle have gradually increased,and the ultra-high-speed machining of precision machine tools have brought about complex vibration and noise problems.On the other hand,people’s requirements for the comfort of living environment are getting higher and higher,and environmental regulations have increasingly strict restrictions on vibration and noise.Therefore,the need to control vibration and noise has gradually increased,and vibration and noise issues have become an important research field.The power flow contains structural force transmission and velocity response and its phase information.Vibration power flow theory has made great progress in the field of flexible vibration isolation.It strives to describe the power transfer relationship between the machine-isolator-flexible foundation from the perspective of vibration energy transfer,and it provides new ideas for system vibration and structural noise control.The finite element power flow method is a method combining the finite element theory and the power flow theory.This paper uses the finite element power flow method to single-layer and floating raft vibration isolation system for analysis,the main research contents include:1.The finite element model of single-layer vibration isolation system is established by ABAQUS,the power flow in the single-layer vibration isolation system is analyzed,the energy transmission path and energy distribution are obtained,and the vibration isolation characteristics of the single-layer vibration isolation system are analyzed.For the single-layer vibration isolation system,the effects of the vibration isolator arrangement,the stiffness of the vibration isolator,the vibration damper,and the quality of the equipment on its vibration isolation are discussed.2.The finite element model of the flexible floating raft vibration isolation system is established,the vibration isolation effect of the floating raft vibration isolation system is studied,the transmission path and energy distribution of the vibration energy of the floating raft vibration isolation system are revealed,and the effects of vibration isolator arrangement,vibration stiffness,vibration damping,and equipment quality on vibration isolation are analyzed.3.The raft frame structure in the floating raft vibration isolation system is simplified to a cantilever plate structure,the plate structure is modeled by dynamics,and the inherent characteristics of the plate structure are analyzed by analytical method;the finite element model of plate structure is established and the dynamic characteristics of plate structure are analyzed from the aspect of vibration power flow;the natural frequency of the plate structure is obtained through experimental modal tests.And the natural frequencies obtained by the three methods are compared to verify the effectiveness of the finite element power flow analysis method.