基于惯性放大机制的钢轨结构弹性波调控研究OA

The problem of vibration and noise caused by train operation is increasingly prominent,and it is difficult for traditional tuned mass damper(TMD)to achieve lightweight and broadband vibration reduction for rail.In view of this,inertial amplification mechanism(IAM)was introduced to achieve greater effective working quality of TMD by using inerter,so as to enhance the suppression of rail structure vibration.A new method for solving the complex band characteristics was proposed by using the energy method and the virtual spring method,based on which the complex band analysis model of the rail structure configured with IAM-TMD was established,and the accuracy of the model was validated through comparison with finite element method(FEM)results.On this basis,the influence mechanism of IAM on the vibration reduction effect of traditional rail TMD was investigated by taking the complex band characteristics as the evaluation index,and the modulation effects of IAM mass ratio,lever angle,and damping coefficient on the propagation of vibration wave in the rail structure were analyzed.The results show that the imaginary part of the complex band can describe the attenuation process of wave propagation inside the bandgap well.After the application of the IAM with α=0.05 and θ=10°,the original Bragg bandgap under TMD is widened from 925-1 260 Hz to 881-1 320 Hz,and the imaginary part of the complex band is increased,which implies that the attenuation capability of TMD is enhanced.The vibration reduction effect of IAM-TMD is proportional to the mass ratio and damping coefficient,and inversely proportional to the lever angle.The complex band characteristics are utilized to analyze the IAM,and the research results can provide a new idea for rail vibration reduction.