Research on Bending Wave Control of Ballastless Track Periodic Structure Based on Amplitude Amplification Mechanism
[Objective]The vibration of track structure has always been a problem to be studied and solved in re-lated fields.The traditional vibration isolation device is limited by its own weight and the safety of train opera-tion,so it is difficult to realize the broadband control of the bending wave of the track structure.[Method]By in-troducing the amplitude amplification mechanism,a lever-type track integrated vibration isolation device is de-signed.Taking the CRTS Ⅲ slab ballastless track structure as the research object,the energy functional variation-al method and artificial spring technology are used to establish the periodic track structure fluctuation analysis model and vibration response analysis model with and artificial spring technology.The control ability of track comprehensive vibration isolation device to bending wave is studied,and the relationship between the working ability of track comprehensive vibration isolation device and amplitude amplification coefficient is analyzed.[Result]The results show that the amplitude amplification mechanism can effectively increase the inertial mass of the vibration isolation device,enhance the damping characteristics and stiffness characteristics of the vibration isolation device,and then significantly improve its working ability.[Conclusion]The ultra-wideband bending wave control design goal of the track integrated vibration isolation device low frequency vibration isolation and high frequency vibration absorption is realized.
amplitude amplificationfluctuation analysisband gapperiodic structurebending wave control
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