Propagation Characteristics of Flexural Wave in Metro Periodic Track-tunnel Systems
In order to explore the propagation characteristics of flexural vibration waves in metro vibration source sys-tem,a Timoshenko beam-Timoshenko beam-Flügge coupled cylindrical shell model was established.The flexural wave band gap and vibration response of the metro periodic track-tunnel system were obtained by energy method and periodic structure theory.The results show that in the range of 0-300 Hz,the flexural wave band gap in the coupled system is 0-46.4 Hz,which is a local resonant band gap,and its width is mainly affected by the mass of the tunnel and the stiffness of the soil;the peak values of vibration admittance functions of rail,trackbed and tunnel are 212 Hz,188 and 46 Hz,respectively,corre-sponding to the first resonant frequencies of rail-fastener subsystem,trackbed-lower support subsystem and tunnel-soil sub-system;the vibration attenuation frequency bands of rail,trackbed and tunnel are respectively 0-142 Hz,0-73 Hz and 0-46 Hz.The relevant research conclusions may provide a new preview and theoretical guidance for refine vibration reduction design of metro track structure and the development of vibration reduction equipment.
vibration and waveperiodic structuremetro track-tunnel coupled structureenergy methodflexural wave band gapvibration response
万方数据
维普
